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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 716 | lvd | 1 | #include "std.h" |
| 2 | |||
| 3 | #include "emul.h" |
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| 4 | #include "vars.h" |
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| 5 | #include "wd93crc.h" |
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| 6 | |||
| 7 | #include "util.h" |
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| 8 | |||
| 9 | void WD1793::process() |
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| 10 | { |
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| 11 | time = comp.t_states + cpu.t; |
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| 12 | |||
| 13 | if(!(sign_status & SIG_HLD) && !(system & 0x20)) |
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| 14 | { |
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| 15 | seldrive->motor = 0; |
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| 16 | } |
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| 17 | |||
| 18 | if (seldrive->rawdata) |
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| 19 | status &= ~WDS_NOTRDY; |
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| 20 | else |
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| 21 | status |= WDS_NOTRDY; |
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| 22 | |||
| 23 | if (!(cmd & 0x80) || (cmd & 0xF0) == 0xD0) // seek / step commands |
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| 24 | { |
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| 25 | status &= ~WDS_INDEX; |
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| 26 | |||
| 27 | if(state != S_IDLE) |
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| 28 | { |
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| 29 | status &= ~(WDS_TRK00 | WDS_INDEX); |
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| 30 | if (!seldrive->track) status |= WDS_TRK00; |
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| 31 | } |
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| 32 | |||
| 33 | // todo: test spinning |
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| 34 | if (seldrive->rawdata && seldrive->motor && ((time+tshift) % (Z80FQ/FDD_RPS) < (Z80FQ*4/1000))) |
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| 35 | { |
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| 36 | // index every turn, len=4ms (if disk present) |
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| 37 | if(state == S_IDLE) |
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| 38 | { |
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| 39 | if(time < idx_tmo) |
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| 40 | status |= WDS_INDEX; |
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| 41 | } |
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| 42 | else |
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| 43 | { |
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| 44 | status |= WDS_INDEX; |
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| 45 | } |
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| 46 | } |
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| 47 | } |
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| 48 | |||
| 49 | for (;;) |
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| 50 | { |
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| 51 | if(!seldrive->motor) |
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| 52 | { |
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| 53 | status |= WDS_NOTRDY; |
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| 54 | } |
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| 55 | else |
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| 56 | { |
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| 57 | status &= ~WDS_NOTRDY; |
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| 58 | } |
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| 59 | |||
| 60 | switch (state) |
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| 61 | { |
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| 62 | |||
| 63 | // ---------------------------------------------------- |
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| 64 | |||
| 65 | case S_IDLE: |
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| 66 | status &= ~WDS_BUSY; |
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| 67 | if(idx_cnt >= 15 || time > idx_tmo) |
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| 68 | { |
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| 69 | idx_cnt = 15; |
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| 70 | status &= WDS_NOTRDY; |
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| 71 | status |= WDS_NOTRDY; |
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| 72 | seldrive->motor = 0; |
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| 73 | sign_status &= ~SIG_HLD; |
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| 74 | } |
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| 75 | rqs = INTRQ; |
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| 76 | return; |
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| 77 | |||
| 78 | case S_WAIT: |
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| 79 | if (time < next) |
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| 80 | return; |
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| 81 | state = state2; |
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| 82 | break; |
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| 83 | |||
| 84 | // ---------------------------------------------------- |
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| 85 | // Подана команда типа 2 или 3 (read/write)/(read am/read trk/write trk) |
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| 86 | case S_DELAY_BEFORE_CMD: |
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| 87 | if (!conf.wd93_nodelay && (cmd & CMD_DELAY)) // Проверка бита E=1 |
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| 88 | next += (Z80FQ*15/1000); // 15ms delay |
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| 89 | state2 = S_WAIT_HLT_RW; |
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| 90 | state = S_WAIT; |
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| 91 | break; |
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| 92 | |||
| 93 | case S_WAIT_HLT_RW: |
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| 94 | if(!(system & 0x08)) // HLT = 0 (бесконечное ожидание HLT) |
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| 95 | { |
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| 96 | return; |
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| 97 | } |
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| 98 | |||
| 99 | state = S_CMD_RW; |
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| 100 | |||
| 101 | case S_CMD_RW: |
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| 102 | if (((cmd & 0xE0) == 0xA0 || (cmd & 0xF0) == 0xF0) && conf.trdos_wp[drive]) |
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| 103 | { |
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| 104 | status |= WDS_WRITEP; |
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| 105 | state = S_IDLE; |
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| 106 | break; |
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| 107 | } |
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| 108 | |||
| 109 | if ((cmd & 0xC0) == 0x80 || (cmd & 0xF8) == 0xC0) |
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| 110 | { |
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| 111 | // read/write sectors or read am - find next AM |
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| 112 | end_waiting_am = next + 5*Z80FQ/FDD_RPS; // max wait disk 5 turns |
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| 113 | find_marker(); |
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| 114 | break; |
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| 115 | } |
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| 116 | |||
| 117 | if ((cmd & 0xF8) == 0xF0) // write track |
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| 118 | { |
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| 119 | rqs = DRQ; |
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| 120 | status |= WDS_DRQ; |
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| 121 | next += 3*seldrive->t.ts_byte; |
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| 122 | state2 = S_WRTRACK; |
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| 123 | state = S_WAIT; |
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| 124 | break; |
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| 125 | } |
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| 126 | |||
| 127 | if ((cmd & 0xF8) == 0xE0) // read track |
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| 128 | { |
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| 129 | load(); |
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| 130 | rwptr = 0; |
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| 131 | rwlen = seldrive->t.trklen; |
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| 132 | state2 = S_READ; |
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| 133 | getindex(); |
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| 134 | break; |
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| 135 | } |
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| 136 | |||
| 137 | // else unknown command |
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| 138 | state = S_IDLE; |
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| 139 | break; |
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| 140 | |||
| 141 | case S_FOUND_NEXT_ID: |
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| 142 | if (!seldrive->rawdata) |
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| 143 | { // no disk - wait again |
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| 144 | end_waiting_am = next + 5*Z80FQ/FDD_RPS; |
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| 145 | nextmk: |
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| 146 | find_marker(); |
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| 147 | break; |
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| 148 | } |
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| 149 | if (next >= end_waiting_am) |
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| 150 | { |
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| 151 | nf: |
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| 152 | status |= WDS_NOTFOUND; |
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| 153 | state = S_IDLE; |
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| 154 | break; |
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| 155 | } |
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| 156 | if (foundid == -1) |
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| 157 | goto nf; |
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| 158 | |||
| 159 | status &= ~WDS_CRCERR; |
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| 160 | load(); |
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| 161 | |||
| 162 | if (!(cmd & 0x80)) // verify after seek |
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| 163 | { |
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| 164 | if (seldrive->t.hdr[foundid].c != track) |
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| 165 | goto nextmk; |
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| 166 | if (!seldrive->t.hdr[foundid].c1) |
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| 167 | { |
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| 168 | status |= WDS_CRCERR; |
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| 169 | goto nextmk; |
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| 170 | } |
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| 171 | state = S_IDLE; break; |
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| 172 | } |
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| 173 | |||
| 174 | if ((cmd & 0xF0) == 0xC0) // read AM |
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| 175 | { |
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| 176 | rwptr = seldrive->t.hdr[foundid].id - seldrive->t.trkd; |
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| 177 | rwlen = 6; |
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| 178 | |||
| 179 | read_first_byte: |
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| 180 | u8 data_mask = 0; |
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| 181 | if(seldrive->t.trkwp) // проверяем карту сбойных байтов |
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| 182 | { |
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| 183 | if(seldrive->t.test_wp(rwptr)) |
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| 184 | { |
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| 185 | data_mask = 0xFF; |
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| 186 | seldrive->t.hdr[foundid].c1 = 0; // bad address crc |
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| 187 | } |
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| 188 | } |
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| 189 | data = seldrive->t.trkd[rwptr++]; |
||
| 190 | data ^= data_mask; |
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| 191 | rwlen--; |
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| 192 | rqs = DRQ; status |= WDS_DRQ; |
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| 193 | next += seldrive->t.ts_byte; |
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| 194 | state = S_WAIT; |
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| 195 | state2 = S_READ; |
||
| 196 | break; |
||
| 197 | } |
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| 198 | |||
| 199 | // else R/W sector(s) |
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| 200 | if (seldrive->t.hdr[foundid].c != track || seldrive->t.hdr[foundid].n != sector) |
||
| 201 | goto nextmk; |
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| 202 | if ((cmd & CMD_SIDE_CMP_FLAG) && (((cmd >> CMD_SIDE_SHIFT) ^ seldrive->t.hdr[foundid].s) & 1)) |
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| 203 | goto nextmk; |
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| 204 | if (!seldrive->t.hdr[foundid].c1) |
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| 205 | { |
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| 206 | status |= WDS_CRCERR; |
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| 207 | goto nextmk; |
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| 208 | } |
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| 209 | |||
| 210 | if (cmd & 0x20) // write sector(s) |
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| 211 | { |
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| 212 | rqs = DRQ; status |= WDS_DRQ; |
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| 213 | next += seldrive->t.ts_byte*9; |
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| 214 | state = S_WAIT; state2 = S_WRSEC; |
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| 215 | break; |
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| 216 | } |
||
| 217 | |||
| 218 | // read sector(s) |
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| 219 | if (!seldrive->t.hdr[foundid].data) |
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| 220 | goto nextmk; // Сектор без зоны данных |
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| 221 | if(!conf.wd93_nodelay) |
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| 222 | next += seldrive->t.ts_byte*(seldrive->t.hdr[foundid].data - seldrive->t.hdr[foundid].id); // Задержка на пропуск заголовка сектора и пробела между заголовком и зоной данных |
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| 223 | state = S_WAIT; |
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| 224 | state2 = S_RDSEC; |
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| 225 | break; |
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| 226 | |||
| 227 | case S_RDSEC: |
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| 228 | if (seldrive->t.hdr[foundid].data[-1] == 0xF8) |
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| 229 | status |= WDS_RECORDT; |
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| 230 | else |
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| 231 | status &= ~WDS_RECORDT; |
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| 232 | rwptr = seldrive->t.hdr[foundid].data - seldrive->t.trkd; // Смещение зоны данных сектора (в байтах) относительно начала трека |
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| 233 | rwlen = 128 << (seldrive->t.hdr[foundid].l & 3); // [vv] |
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| 234 | goto read_first_byte; |
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| 235 | |||
| 236 | case S_READ: |
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| 237 | if (notready()) |
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| 238 | break; |
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| 239 | load(); |
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| 240 | |||
| 241 | if(!seldrive->t.trkd) |
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| 242 | { |
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| 243 | status |= WDS_NOTFOUND; |
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| 244 | state = S_IDLE; |
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| 245 | break; |
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| 246 | } |
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| 247 | |||
| 248 | if (rwlen) |
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| 249 | { |
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| 250 | trdos_load = ROMLED_TIME; |
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| 251 | if (rqs & DRQ) |
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| 252 | status |= WDS_LOST; |
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| 253 | |||
| 254 | u8 data_mask = 0; |
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| 255 | if(seldrive->t.trkwp) // проверяем карту сбойных байтов |
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| 256 | { |
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| 257 | if(seldrive->t.test_wp(rwptr)) |
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| 258 | { |
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| 259 | data_mask = 0xFF; |
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| 260 | if ((cmd & 0xE0) == 0x80) // read sector |
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| 261 | { |
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| 262 | seldrive->t.hdr[foundid].c2 = 0; // bad data crc |
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| 263 | } |
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| 264 | if ((cmd & 0xF0) == 0xC0) // read address |
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| 265 | { |
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| 266 | seldrive->t.hdr[foundid].c1 = 0; // bad address crc |
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| 267 | } |
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| 268 | } |
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| 269 | } |
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| 270 | data = seldrive->t.trkd[rwptr++]; |
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| 271 | data ^= data_mask; |
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| 272 | rwlen--; |
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| 273 | rqs = DRQ; |
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| 274 | status |= WDS_DRQ; |
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| 275 | |||
| 276 | if (!conf.wd93_nodelay) |
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| 277 | next += seldrive->t.ts_byte; |
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| 278 | else |
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| 279 | next = time + 1; |
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| 280 | state = S_WAIT; |
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| 281 | state2 = S_READ; |
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| 282 | } |
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| 283 | else |
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| 284 | { |
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| 285 | if ((cmd & 0xE0) == 0x80) // read sector |
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| 286 | { |
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| 287 | if (!seldrive->t.hdr[foundid].c2) |
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| 288 | status |= WDS_CRCERR; |
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| 289 | if (cmd & CMD_MULTIPLE) |
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| 290 | { |
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| 291 | sector++; |
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| 292 | state = S_CMD_RW; |
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| 293 | break; |
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| 294 | } |
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| 295 | } |
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| 296 | |||
| 297 | // FIXME: Временный хак для zx-format 3 |
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| 298 | if (((cmd & 0xF8) == 0xE0) && (seldrive->t.trklen < MAX_TRACK_LEN)) // read track |
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| 299 | { |
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| 300 | status |= WDS_LOST; |
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| 301 | } |
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| 302 | |||
| 303 | if ((cmd & 0xF0) == 0xC0) // read address |
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| 304 | { |
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| 305 | if (!seldrive->t.hdr[foundid].c1) |
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| 306 | status |= WDS_CRCERR; |
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| 307 | } |
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| 308 | state = S_IDLE; |
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| 309 | } |
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| 310 | break; |
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| 311 | |||
| 312 | |||
| 313 | case S_WRSEC: |
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| 314 | load(); |
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| 315 | if (rqs & DRQ) |
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| 316 | { |
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| 317 | status |= WDS_LOST; |
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| 318 | state = S_IDLE; |
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| 319 | break; |
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| 320 | } |
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| 321 | seldrive->optype |= 1; |
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| 322 | rwptr = seldrive->t.hdr[foundid].id + 6 + 11 + 11 - seldrive->t.trkd; |
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| 323 | for (rwlen = 0; rwlen < 12; rwlen++) |
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| 324 | seldrive->t.write(rwptr++, 0, 0); |
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| 325 | for (rwlen = 0; rwlen < 3; rwlen++) |
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| 326 | seldrive->t.write(rwptr++, 0xA1, 1); |
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| 327 | seldrive->t.write(rwptr++, (cmd & CMD_WRITE_DEL)? 0xF8 : 0xFB, 0); |
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| 328 | rwlen = 128 << (seldrive->t.hdr[foundid].l & 3); // [vv] |
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| 329 | state = S_WRITE; |
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| 330 | break; |
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| 331 | |||
| 332 | case S_WRITE: |
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| 333 | if (notready()) |
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| 334 | break; |
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| 335 | if (rqs & DRQ) |
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| 336 | status |= WDS_LOST, data = 0; |
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| 337 | trdos_save = ROMLED_TIME; |
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| 338 | seldrive->t.write(rwptr++, data, 0); rwlen--; |
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| 339 | if (rwptr == seldrive->t.trklen) rwptr = 0; |
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| 340 | seldrive->t.sf = JUST_SEEK; // invalidate sectors |
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| 341 | if (rwlen) |
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| 342 | { |
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| 343 | if (!conf.wd93_nodelay) next += seldrive->t.ts_byte; |
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| 344 | state = S_WAIT; state2 = S_WRITE; |
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| 345 | rqs = DRQ; status |= WDS_DRQ; |
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| 346 | } |
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| 347 | else |
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| 348 | { |
||
| 349 | unsigned len = (128 << (seldrive->t.hdr[foundid].l & 3)) + 1; //[vv] |
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| 350 | unsigned char sc[2056]; |
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| 351 | if (rwptr < len) |
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| 352 | { |
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| 353 | memcpy(sc, seldrive->t.trkd + seldrive->t.trklen - rwptr, rwptr); |
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| 354 | memcpy(sc + rwptr, seldrive->t.trkd, len - rwptr); |
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| 355 | } |
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| 356 | else |
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| 357 | memcpy(sc, seldrive->t.trkd + rwptr - len, len); |
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| 358 | unsigned crc = wd93_crc(sc, len); |
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| 359 | seldrive->t.write(rwptr++, (BYTE)crc, 0); |
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| 360 | seldrive->t.write(rwptr++, (BYTE)(crc >> 8), 0); |
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| 361 | seldrive->t.write(rwptr, 0xFF, 0); |
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| 362 | if (cmd & CMD_MULTIPLE) |
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| 363 | { |
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| 364 | sector++; |
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| 365 | state = S_CMD_RW; |
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| 366 | break; |
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| 367 | } |
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| 368 | state = S_IDLE; |
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| 369 | } |
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| 370 | break; |
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| 371 | |||
| 372 | case S_WRTRACK: |
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| 373 | if (rqs & DRQ) |
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| 374 | { |
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| 375 | status |= WDS_LOST; |
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| 376 | state = S_IDLE; |
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| 377 | break; |
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| 378 | } |
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| 379 | seldrive->optype |= 2; |
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| 380 | state2 = S_WR_TRACK_DATA; |
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| 381 | start_crc = 0; |
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| 382 | getindex(); |
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| 383 | end_waiting_am = next + 5 * Z80FQ /FDD_RPS; |
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| 384 | break; |
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| 385 | |||
| 386 | case S_WR_TRACK_DATA: |
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| 387 | { |
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| 388 | if (notready()) |
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| 389 | break; |
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| 390 | trdos_format = ROMLED_TIME; |
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| 391 | if (rqs & DRQ) |
||
| 392 | { |
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| 393 | status |= WDS_LOST; |
||
| 394 | data = 0; |
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| 395 | } |
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| 396 | seldrive->t.seek(seldrive, seldrive->track, side, JUST_SEEK); |
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| 397 | seldrive->t.sf = JUST_SEEK; // invalidate sectors |
||
| 398 | |||
| 399 | if(!seldrive->t.trkd) |
||
| 400 | { |
||
| 401 | state = S_IDLE; |
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| 402 | break; |
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| 403 | } |
||
| 404 | |||
| 405 | unsigned char marker = 0, byte = data; |
||
| 406 | unsigned crc; |
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| 407 | switch(data) |
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| 408 | { |
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| 409 | case 0xF5: |
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| 410 | byte = 0xA1; |
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| 411 | marker = 1; |
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| 412 | start_crc = rwptr + 1; |
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| 413 | break; |
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| 414 | |||
| 415 | case 0xF6: |
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| 416 | byte = 0xC2; |
||
| 417 | marker = 1; |
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| 418 | break; |
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| 419 | |||
| 420 | case 0xF7: |
||
| 421 | crc = wd93_crc(seldrive->t.trkd + start_crc, rwptr - start_crc); |
||
| 422 | byte = crc & 0xFF; |
||
| 423 | break; |
||
| 424 | } |
||
| 425 | |||
| 426 | seldrive->t.write(rwptr++, byte, marker); |
||
| 427 | rwlen--; |
||
| 428 | if (data == 0xF7) |
||
| 429 | { |
||
| 430 | seldrive->t.write(rwptr++, (crc >> 8) & 0xFF, 0); |
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| 431 | rwlen--; // second byte of CRC16 |
||
| 432 | } |
||
| 433 | |||
| 434 | if ((int)rwlen > 0) |
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| 435 | { |
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| 436 | if (!conf.wd93_nodelay) |
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| 437 | next += seldrive->t.ts_byte; |
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| 438 | state2 = S_WR_TRACK_DATA; |
||
| 439 | state = S_WAIT; |
||
| 440 | rqs = DRQ; |
||
| 441 | status |= WDS_DRQ; |
||
| 442 | break; |
||
| 443 | } |
||
| 444 | state = S_IDLE; |
||
| 445 | break; |
||
| 446 | } |
||
| 447 | |||
| 448 | // ---------------------------------------------------- |
||
| 449 | |||
| 450 | case S_TYPE1_CMD: // Подана команда типа 1 (restore/seek/step) |
||
| 451 | status &= ~(WDS_CRCERR | WDS_SEEKERR | WDS_WRITEP); |
||
| 452 | rqs = 0; |
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| 453 | |||
| 454 | if (conf.trdos_wp[drive]) |
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| 455 | status |= WDS_WRITEP; |
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| 456 | |||
| 457 | seldrive->motor = (cmd & CMD_SEEK_HEADLOAD) || (system & 0x20) ? next + 2*Z80FQ : 0; |
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| 458 | |||
| 459 | state2 = S_SEEKSTART; // default is seek/restore |
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| 460 | |||
| 461 | if (cmd & 0xE0) // single step |
||
| 462 | { |
||
| 463 | if (cmd & 0x40) // step in / step out |
||
| 464 | stepdirection = (cmd & CMD_SEEK_DIR) ? -1 : 1; |
||
| 465 | state2 = S_STEP; |
||
| 466 | } |
||
| 467 | |||
| 468 | next += (Z80FQ*14)/1000000; |
||
| 469 | state = S_WAIT; // Задержка 14мкс перед появленеим статуса BUSY |
||
| 470 | break; |
||
| 471 | |||
| 472 | |||
| 473 | case S_STEP: |
||
| 474 | { |
||
| 475 | status |= WDS_BUSY; |
||
| 476 | trdos_seek = ROMLED_TIME; |
||
| 477 | |||
| 478 | if (seldrive->track == 0 && stepdirection < 0) // проверка TRK00 |
||
| 479 | { |
||
| 480 | track = 0; |
||
| 481 | state = S_VERIFY; // Обработка бита команды V |
||
| 482 | break; |
||
| 483 | } |
||
| 484 | |||
| 485 | // Обработкабита T=1 (для seek всегда 1, для restore всегда 0, но обновление регистра трэка делается) |
||
| 486 | if (!(cmd & 0xF0) || (cmd & CMD_SEEK_TRKUPD)) |
||
| 487 | track += stepdirection; |
||
| 488 | |||
| 489 | if(seldrive->motor) |
||
| 490 | { |
||
| 491 | seldrive->track += stepdirection; |
||
| 492 | if (seldrive->track == (unsigned char)-1) |
||
| 493 | seldrive->track = 0; |
||
| 494 | if (seldrive->track >= MAX_PHYS_CYL) |
||
| 495 | seldrive->track = MAX_PHYS_CYL; |
||
| 496 | seldrive->t.clear(); |
||
| 497 | } |
||
| 498 | |||
| 499 | static const unsigned steps[] = { 6,12,20,30 }; |
||
| 500 | if (!conf.wd93_nodelay) |
||
| 501 | next += steps[cmd & CMD_SEEK_RATE]*Z80FQ/1000; |
||
| 502 | |||
| 503 | #ifndef MOD_9X |
||
| 504 | if (!conf.wd93_nodelay && conf.fdd_noise) |
||
| 505 | Beep((stepdirection > 0)? 600 : 800, 2); |
||
| 506 | #endif |
||
| 507 | |||
| 508 | state2 = (cmd & 0xE0) ? S_VERIFY /*Команда step*/: S_SEEK /*Команда seek/restore*/; |
||
| 509 | state = S_WAIT; |
||
| 510 | break; |
||
| 511 | } |
||
| 512 | |||
| 513 | case S_SEEKSTART: |
||
| 514 | status |= WDS_BUSY; |
||
| 515 | |||
| 516 | if (!(cmd & 0x10)) // Команда restore |
||
| 517 | { |
||
| 518 | if (!conf.wd93_nodelay) |
||
| 519 | { |
||
| 520 | state2 = S_RESTORE; |
||
| 521 | next += (Z80FQ*21)/1000000; // задержка ~21мкс перед загрузкой регистра трэка |
||
| 522 | state = S_WAIT; |
||
| 523 | break; |
||
| 524 | } |
||
| 525 | |||
| 526 | state = S_RESTORE; |
||
| 527 | break; |
||
| 528 | } |
||
| 529 | state = S_SEEK; |
||
| 530 | break; |
||
| 531 | |||
| 532 | case S_RESTORE: |
||
| 533 | track = 0xFF; |
||
| 534 | data = 0; |
||
| 535 | state = S_SEEK; |
||
| 536 | break; |
||
| 537 | |||
| 538 | case S_SEEK: |
||
| 539 | if (data == track) |
||
| 540 | { |
||
| 541 | state = S_VERIFY; |
||
| 542 | break; |
||
| 543 | } |
||
| 544 | stepdirection = (data < track) ? -1 : 1; |
||
| 545 | state = S_STEP; |
||
| 546 | break; |
||
| 547 | |||
| 548 | case S_VERIFY: |
||
| 549 | if (!(cmd & CMD_SEEK_VERIFY)) // Проверка номера трэка не нужна V=0 |
||
| 550 | { |
||
| 551 | status |= WDS_BUSY; |
||
| 552 | state2 = S_IDLE; |
||
| 553 | state = S_WAIT; |
||
| 554 | idx_tmo = next + 15 * Z80FQ/FDD_RPS; // 15 disk turns |
||
| 555 | next += (105*Z80FQ)/1000000; // Задержка 105мкс со статусом BUSY |
||
| 556 | break; |
||
| 557 | } |
||
| 558 | |||
| 559 | // Проверка номера трэка нужна V=1 |
||
| 560 | sign_status |= SIG_HLD; |
||
| 561 | |||
| 562 | // Ожидание 15мс |
||
| 563 | // | |
||
| 564 | // v |
||
| 565 | // Ожидание HLT == 1 |
||
| 566 | // | |
||
| 567 | // v |
||
| 568 | // S_VERIFY2 |
||
| 569 | if (!conf.wd93_nodelay) |
||
| 570 | { |
||
| 571 | next += (15*Z80FQ)/1000; // Задержка 15мс |
||
| 572 | state2 = S_WAIT_HLT; |
||
| 573 | state = S_WAIT; |
||
| 574 | break; |
||
| 575 | } |
||
| 576 | state = S_WAIT_HLT; |
||
| 577 | |||
| 578 | case S_WAIT_HLT: |
||
| 579 | if(!(system & 0x08)) // HLT = 0 (бесконечное ожидание HLT) |
||
| 580 | { |
||
| 581 | return; |
||
| 582 | } |
||
| 583 | state = S_VERIFY2; |
||
| 584 | |||
| 585 | case S_VERIFY2: |
||
| 586 | end_waiting_am = next + 6*Z80FQ/FDD_RPS; // max wait disk 6 turns |
||
| 587 | load(); |
||
| 588 | find_marker(); |
||
| 589 | break; |
||
| 590 | |||
| 591 | // ---------------------------------------------------- |
||
| 592 | |||
| 593 | case S_RESET: // seek to trk0, but don't be busy |
||
| 594 | if (!seldrive->track) |
||
| 595 | state = S_IDLE; |
||
| 596 | else |
||
| 597 | { |
||
| 598 | seldrive->track--; |
||
| 599 | seldrive->t.clear(); |
||
| 600 | } |
||
| 601 | // if (!seldrive->track) track = 0; |
||
| 602 | next += 6*Z80FQ/1000; |
||
| 603 | break; |
||
| 604 | |||
| 605 | |||
| 606 | default: |
||
| 607 | errexit("WD1793 in wrong state"); |
||
| 608 | } |
||
| 609 | } |
||
| 610 | } |
||
| 611 | |||
| 612 | void WD1793::find_marker() |
||
| 613 | { |
||
| 614 | if (conf.wd93_nodelay && seldrive->track != track) |
||
| 615 | seldrive->track = track; |
||
| 616 | load(); |
||
| 617 | |||
| 618 | foundid = -1; |
||
| 619 | if (seldrive->motor && seldrive->rawdata) |
||
| 620 | { |
||
| 621 | unsigned div = seldrive->t.trklen*seldrive->t.ts_byte; // Длина дорожки в тактах cpu |
||
| 622 | unsigned i = (unsigned)((next+tshift) % div) / seldrive->t.ts_byte; // Позиция байта соответствующего текущему такту на дорожке |
||
| 623 | unsigned wait = -1; |
||
| 624 | |||
| 625 | // Поиск заголовка минимально отстоящего от текущего байта |
||
| 626 | for (unsigned is = 0; is < seldrive->t.s; is++) |
||
| 627 | { |
||
| 628 | unsigned pos = seldrive->t.hdr[is].id - seldrive->t.trkd; // Смещение (в байтах) заголовка относительно начала дорожки |
||
| 629 | unsigned dist = (pos > i)? pos-i : seldrive->t.trklen+pos-i; // Расстояние (в байтах) от заголовка до текущего байта |
||
| 630 | if (dist < wait) |
||
| 631 | { |
||
| 632 | wait = dist; |
||
| 633 | foundid = is; |
||
| 634 | } |
||
| 635 | } |
||
| 636 | |||
| 637 | if (foundid != -1) |
||
| 638 | wait *= seldrive->t.ts_byte; // Задержка в тактах от текущего такта до такта чтения первого байта заголовка |
||
| 639 | else |
||
| 640 | wait = 10*Z80FQ/FDD_RPS; |
||
| 641 | |||
| 642 | if (conf.wd93_nodelay && foundid != -1) |
||
| 643 | { |
||
| 644 | // adjust tshift, that id appares right under head |
||
| 645 | unsigned pos = seldrive->t.hdr[foundid].id - seldrive->t.trkd + 2; |
||
| 646 | tshift = (unsigned)(((pos * seldrive->t.ts_byte) - (next % div) + div) % div); |
||
| 647 | wait = 100; // delay=0 causes fdc to search infinitely, when no matched id on track |
||
| 648 | } |
||
| 649 | |||
| 650 | next += wait; |
||
| 651 | } // else no index pulses - infinite wait |
||
| 652 | else |
||
| 653 | { |
||
| 654 | next = comp.t_states + cpu.t + 1; |
||
| 655 | } |
||
| 656 | |||
| 657 | if (seldrive->rawdata && next > end_waiting_am) |
||
| 658 | { |
||
| 659 | next = end_waiting_am; |
||
| 660 | foundid = -1; |
||
| 661 | } |
||
| 662 | state = S_WAIT; |
||
| 663 | state2 = S_FOUND_NEXT_ID; |
||
| 664 | } |
||
| 665 | |||
| 666 | char WD1793::notready() |
||
| 667 | { |
||
| 668 | // fdc is too fast in no-delay mode, wait until cpu handles DRQ, but not more 'end_waiting_am' |
||
| 669 | if (conf.wd93_nodelay && (rqs & DRQ) && (next < (end_waiting_am - 5*Z80FQ/FDD_RPS) + (600*Z80FQ)/1000)) |
||
| 670 | { |
||
| 671 | state2 = state; |
||
| 672 | state = S_WAIT; |
||
| 673 | next += seldrive->t.ts_byte; |
||
| 674 | return 1; |
||
| 675 | } |
||
| 676 | |||
| 677 | return 0; |
||
| 678 | } |
||
| 679 | |||
| 680 | void WD1793::getindex() |
||
| 681 | { |
||
| 682 | unsigned trlen = seldrive->t.trklen*seldrive->t.ts_byte; |
||
| 683 | unsigned ticks = (unsigned)((next+tshift) % trlen); |
||
| 684 | if (!conf.wd93_nodelay) |
||
| 685 | next += (trlen - ticks); |
||
| 686 | rwptr = 0; |
||
| 687 | rwlen = seldrive->t.trklen; |
||
| 688 | state = S_WAIT; |
||
| 689 | } |
||
| 690 | |||
| 691 | void WD1793::load() |
||
| 692 | { |
||
| 693 | seldrive->t.seek(seldrive, seldrive->track, side, LOAD_SECTORS); |
||
| 694 | } |
||
| 695 | |||
| 696 | unsigned char WD1793::in(unsigned char port) |
||
| 697 | { |
||
| 698 | process(); |
||
| 699 | if (port & 0x80) |
||
| 700 | return rqs | (system & 0x3F); |
||
| 701 | if (port == 0x1F) |
||
| 702 | { |
||
| 703 | rqs &= ~INTRQ; |
||
| 704 | return RdStatus(); |
||
| 705 | } |
||
| 706 | if (port == 0x3F) |
||
| 707 | return track; |
||
| 708 | if (port == 0x5F) |
||
| 709 | return sector; |
||
| 710 | if (port == 0x7F) |
||
| 711 | { |
||
| 712 | status &= ~WDS_DRQ; |
||
| 713 | rqs &= ~DRQ; |
||
| 714 | return data; |
||
| 715 | } |
||
| 716 | return 0xFF; |
||
| 717 | } |
||
| 718 | |||
| 719 | u8 WD1793::RdStatus() |
||
| 720 | { |
||
| 721 | if(!(cmd & 0x80)) |
||
| 722 | { |
||
| 723 | // hld & hlt |
||
| 724 | return status | (((sign_status & SIG_HLD) && (system & 8)) ? WDS_HEADL : 0); |
||
| 725 | } |
||
| 726 | return status; |
||
| 727 | } |
||
| 728 | |||
| 729 | |||
| 730 | void WD1793::out(unsigned char port, unsigned char val) |
||
| 731 | { |
||
| 732 | process(); |
||
| 733 | |||
| 734 | if (port == 0x1F) |
||
| 735 | { // cmd |
||
| 736 | |||
| 737 | // force interrupt (type 4) |
||
| 738 | if ((val & 0xF0) == 0xD0) |
||
| 739 | { |
||
| 740 | u8 Cond = (val & 0xF); |
||
| 741 | next = comp.t_states + cpu.t; |
||
| 742 | idx_cnt = 0; |
||
| 743 | idx_tmo = next + 15 * Z80FQ/FDD_RPS; // 15 disk turns |
||
| 744 | cmd = val; |
||
| 745 | |||
| 746 | if(Cond == 0) |
||
| 747 | { |
||
| 748 | state = S_IDLE; rqs = 0; |
||
| 749 | status &= ~WDS_BUSY; |
||
| 750 | return; |
||
| 751 | } |
||
| 752 | |||
| 753 | if(Cond & 8) // unconditional int |
||
| 754 | { |
||
| 755 | state = S_IDLE; rqs = INTRQ; |
||
| 756 | status &= ~WDS_BUSY; |
||
| 757 | return; |
||
| 758 | } |
||
| 759 | |||
| 760 | if(Cond & 4) // int by idam (unimplemented yet) |
||
| 761 | { |
||
| 762 | state = S_IDLE; rqs = INTRQ; |
||
| 763 | status &= ~WDS_BUSY; |
||
| 764 | return; |
||
| 765 | } |
||
| 766 | |||
| 767 | if(Cond & 2) // int 1->0 rdy (unimplemented yet) |
||
| 768 | { |
||
| 769 | state = S_IDLE; rqs = INTRQ; |
||
| 770 | status &= ~WDS_BUSY; |
||
| 771 | return; |
||
| 772 | } |
||
| 773 | |||
| 774 | if(Cond & 1) // int 0->1 rdy (unimplemented yet) |
||
| 775 | { |
||
| 776 | state = S_IDLE; rqs = INTRQ; |
||
| 777 | status &= ~WDS_BUSY; |
||
| 778 | return; |
||
| 779 | } |
||
| 780 | |||
| 781 | return; |
||
| 782 | } |
||
| 783 | |||
| 784 | if (status & WDS_BUSY) |
||
| 785 | return; |
||
| 786 | cmd = val; |
||
| 787 | next = comp.t_states + cpu.t; |
||
| 788 | status |= WDS_BUSY; |
||
| 789 | rqs = 0; |
||
| 790 | idx_cnt = 0; |
||
| 791 | idx_tmo = LLONG_MAX; |
||
| 792 | |||
| 793 | //----------------------------------------------------------------------- |
||
| 794 | |||
| 795 | if (cmd & 0x80) // read/write command (type 2, 3) |
||
| 796 | { |
||
| 797 | status = (status | WDS_BUSY) & ~(WDS_DRQ | WDS_LOST | WDS_NOTFOUND | WDS_RECORDT | WDS_WRITEP); |
||
| 798 | |||
| 799 | // continue disk spinning |
||
| 800 | seldrive->motor = next + 2*Z80FQ; |
||
| 801 | |||
| 802 | // abort if no disk |
||
| 803 | if (status & WDS_NOTRDY) |
||
| 804 | { |
||
| 805 | state2 = S_IDLE; |
||
| 806 | state = S_WAIT; |
||
| 807 | next = comp.t_states + cpu.t + Z80FQ/FDD_RPS; |
||
| 808 | rqs = INTRQ; |
||
| 809 | return; |
||
| 810 | } |
||
| 811 | |||
| 812 | sign_status |= SIG_HLD; |
||
| 813 | |||
| 814 | state = S_DELAY_BEFORE_CMD; |
||
| 815 | return; |
||
| 816 | } |
||
| 817 | |||
| 818 | // (type 1) |
||
| 819 | if(cmd & CMD_SEEK_HEADLOAD) // h = 1 |
||
| 820 | sign_status |= SIG_HLD; |
||
| 821 | else |
||
| 822 | sign_status &= ~SIG_HLD; |
||
| 823 | |||
| 824 | // else seek/step command |
||
| 825 | status &= ~WDS_BUSY; |
||
| 826 | state = S_TYPE1_CMD; |
||
| 827 | return; |
||
| 828 | } |
||
| 829 | |||
| 830 | //======================================================================= |
||
| 831 | |||
| 832 | if (port == 0x3F) |
||
| 833 | { |
||
| 834 | track = val; |
||
| 835 | return; |
||
| 836 | } |
||
| 837 | |||
| 838 | if (port == 0x5F) |
||
| 839 | { |
||
| 840 | sector = val; |
||
| 841 | return; |
||
| 842 | } |
||
| 843 | |||
| 844 | if (port == 0x7F) |
||
| 845 | { |
||
| 846 | data = val; |
||
| 847 | rqs &= ~DRQ; |
||
| 848 | status &= ~WDS_DRQ; |
||
| 849 | return; |
||
| 850 | } |
||
| 851 | |||
| 852 | if (port & 0x80) // FF |
||
| 853 | { // system |
||
| 854 | drive = val & 3; |
||
| 855 | side = ~(val >> 4) & 1; |
||
| 856 | seldrive = &fdd[drive]; |
||
| 857 | seldrive->t.clear(); |
||
| 858 | |||
| 859 | if (!(val & 0x04)) |
||
| 860 | { // reset |
||
| 861 | status = WDS_NOTRDY; |
||
| 862 | rqs = INTRQ; |
||
| 863 | seldrive->motor = 0; |
||
| 864 | state = S_IDLE; |
||
| 865 | idx_cnt = 0; |
||
| 866 | |||
| 867 | #if 1 // move head to trk00 |
||
| 868 | // steptime = 6 * (Z80FQ / 1000); // 6ms |
||
| 869 | next += 1*Z80FQ/1000; // 1ms before command |
||
| 870 | state = S_RESET; |
||
| 871 | //seldrive->track = 0; |
||
| 872 | #endif |
||
| 873 | } |
||
| 874 | else |
||
| 875 | { |
||
| 876 | if((system ^ val) & SYS_HLT) // hlt 0->1 |
||
| 877 | { |
||
| 878 | if(!(status & WDS_BUSY)) |
||
| 879 | { |
||
| 880 | idx_cnt++; |
||
| 881 | } |
||
| 882 | } |
||
| 883 | } |
||
| 884 | |||
| 885 | if(val & 0x20) // В quorum бит D5 управляет мотором дисковода |
||
| 886 | { |
||
| 887 | sign_status |= SIG_HLD; |
||
| 888 | seldrive->motor = next + 2*Z80FQ; |
||
| 889 | } |
||
| 890 | system = val; |
||
| 891 | } |
||
| 892 | } |
||
| 893 | |||
| 894 | void WD1793::trdos_traps() |
||
| 895 | { |
||
| 896 | unsigned pc = (cpu.pc & 0xFFFF); |
||
| 897 | if (pc < 0x3DFD) |
||
| 898 | return; |
||
| 899 | |||
| 900 | // Позиционирование на соседнюю дорожку (пауза) |
||
| 901 | if (pc == 0x3DFD && bankr[0][0x3DFD] == 0x3E && bankr[0][0x3DFF] == 0x0E) |
||
| 902 | { |
||
| 903 | cpu.pc = cpu.DbgMemIf->rm(cpu.sp++); |
||
| 904 | cpu.pc |= (cpu.DbgMemIf->rm(cpu.sp++) << 8); |
||
| 905 | cpu.a = 0; |
||
| 906 | cpu.c = 0; |
||
| 907 | } |
||
| 908 | |||
| 909 | // Позиционирование на произвольную дорожку (пауза) |
||
| 910 | if (pc == 0x3EA0 && bankr[0][0x3EA0] == 0x06 && bankr[0][0x3EA2] == 0x3E) |
||
| 911 | { |
||
| 912 | cpu.pc = cpu.DbgMemIf->rm(cpu.sp++); |
||
| 913 | cpu.pc |= (cpu.DbgMemIf->rm(cpu.sp++) << 8); |
||
| 914 | cpu.a = 0; |
||
| 915 | cpu.b = 0; |
||
| 916 | } |
||
| 917 | |||
| 918 | if (pc == 0x3E01 && bankr[0][0x3E01] == 0x0D) |
||
| 919 | { |
||
| 920 | cpu.a = cpu.c = 1; |
||
| 921 | return; |
||
| 922 | } // no delays |
||
| 923 | |||
| 924 | if (pc == 0x3FEC && bankr[0][0x3FED] == 0xA2 && |
||
| 925 | (state == S_READ || (state2 == S_READ && state == S_WAIT))) |
||
| 926 | { |
||
| 927 | trdos_load = ROMLED_TIME; |
||
| 928 | if (rqs & DRQ) |
||
| 929 | { |
||
| 930 | cpu.DbgMemIf->wm(cpu.hl, data); // move byte from controller |
||
| 931 | cpu.hl++; |
||
| 932 | cpu.b--; |
||
| 933 | rqs &= ~DRQ; |
||
| 934 | status &= ~WDS_DRQ; |
||
| 935 | } |
||
| 936 | |||
| 937 | if(seldrive->t.trkd) |
||
| 938 | { |
||
| 939 | while (rwlen) |
||
| 940 | { // move others |
||
| 941 | cpu.DbgMemIf->wm(cpu.hl, seldrive->t.trkd[rwptr++]); |
||
| 942 | rwlen--; |
||
| 943 | cpu.hl++; |
||
| 944 | cpu.b--; |
||
| 945 | } |
||
| 946 | } |
||
| 947 | cpu.pc += 2; // skip INI |
||
| 948 | return; |
||
| 949 | } |
||
| 950 | if (pc == 0x3FD1 && bankr[0][0x3FD2] == 0xA3 && |
||
| 951 | (rqs & DRQ) && (rwlen>1) && (state == S_WRITE || (state2 == S_WRITE && state == S_WAIT))) |
||
| 952 | { |
||
| 953 | trdos_save = ROMLED_TIME; |
||
| 954 | while (rwlen > 1) |
||
| 955 | { |
||
| 956 | seldrive->t.write(rwptr++, cpu.DbgMemIf->rm(cpu.hl), 0); |
||
| 957 | rwlen--; |
||
| 958 | cpu.hl++; |
||
| 959 | cpu.b--; |
||
| 960 | } |
||
| 961 | cpu.pc += 2; // skip OUTI |
||
| 962 | return; |
||
| 963 | } |
||
| 964 | } |