| /* id_fd.c: Interdata floppy disk simulator | |
| Copyright (c) 2001-2008, Robert M Supnik | |
| Permission is hereby granted, free of charge, to any person obtaining a | |
| copy of this software and associated documentation files (the "Software"), | |
| to deal in the Software without restriction, including without limitation | |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
| and/or sell copies of the Software, and to permit persons to whom the | |
| Software is furnished to do so, subject to the following conditions: | |
| The above copyright notice and this permission notice shall be included in | |
| all copies or substantial portions of the Software. | |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
| IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
| CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| Except as contained in this notice, the name of Robert M Supnik shall not be | |
| used in advertising or otherwise to promote the sale, use or other dealings | |
| in this Software without prior written authorization from Robert M Supnik. | |
| fd M46-630 floppy disk | |
| A diskette consists of 77 tracks, each with 26 sectors of 128B. The | |
| Interdata floppy uses a logical record numbering scheme from 1 to 2002. | |
| Physical tracks are numbered 0-76, physical sectors 1-26. | |
| To allow for deleted data handling, a directory is appended to the end | |
| of the image, one byte per LRN. Zero (the default) is a normal record, | |
| non-zero a deleted record. | |
| */ | |
| #include "id_defs.h" | |
| #define FD_NUMTR 77 /* tracks/disk */ | |
| #define FD_NUMSC 26 /* sectors/track */ | |
| #define FD_NUMBY 128 /* bytes/sector */ | |
| #define FD_NUMLRN (FD_NUMTR * FD_NUMSC) /* LRNs/disk */ | |
| #define FD_SIZE (FD_NUMLRN * FD_NUMBY) /* bytes/disk */ | |
| #define FD_NUMDR 4 /* drives/controller */ | |
| #define UNIT_V_WLK (UNIT_V_UF) /* write locked */ | |
| #define UNIT_WLK (1u << UNIT_V_UF) | |
| #define UNIT_WPRT (UNIT_WLK | UNIT_RO) /* write protect */ | |
| #define LRN u3 /* last LRN */ | |
| #define FNC u4 /* last function */ | |
| #define GET_DA(x) (((x) - 1) * FD_NUMBY) | |
| #define GET_TRK(x) (((x) - 1) / FD_NUMSC) | |
| #define GET_SEC(x) ((((x) - 1) % FD_NUMSC) + 1) | |
| #define LRN_BOOT 5 /* boot block LRN */ | |
| /* Command byte */ | |
| #define CMD_V_UNIT 4 /* unit */ | |
| #define CMD_M_UNIT 0x3 | |
| #define GET_UNIT(x) (((x) >> CMD_V_UNIT) & CMD_M_UNIT) | |
| #define CMD_V_FNC 0 /* function */ | |
| #define CMD_M_FNC 0xF | |
| #define GET_FNC(x) (((x) >> CMD_V_FNC) & CMD_M_FNC) | |
| #define FNC_RD 0x1 /* read */ | |
| #define FNC_WR 0x2 /* write */ | |
| #define FNC_RDID 0x3 /* read ID */ | |
| #define FNC_RSTA 0x4 /* read status */ | |
| #define FNC_DEL 0x5 /* write deleted */ | |
| #define FNC_BOOT 0x6 /* boot */ | |
| #define FNC_STOP 0x7 /* stop */ | |
| #define FNC_RESET 0x8 /* reset */ | |
| #define FNC_FMT 0x9 /* format NI */ | |
| #define FNC_STOPPING 0x10 /* stopping */ | |
| /* Status byte, * = dynamic */ | |
| #define STA_WRP 0x80 /* *write prot */ | |
| #define STA_DEF 0x40 /* def track NI */ | |
| #define STA_DEL 0x20 /* del record */ | |
| #define STA_ERR 0x10 /* error */ | |
| #define STA_IDL 0x02 /* idle */ | |
| #define STA_OFL 0x01 /* fault */ | |
| #define STA_MASK (STA_DEF|STA_DEL|STA_ERR|STA_BSY|STA_IDL) | |
| #define SET_EX (STA_ERR) /* set EX */ | |
| /* Extended status, 6 bytes, * = dynamic */ | |
| #define ES_SIZE 6 | |
| #define ES0_HCRC 0x80 /* ID CRC NI */ | |
| #define ES0_DCRC 0x40 /* data CRC NI */ | |
| #define ES0_LRN 0x20 /* illegal LRN */ | |
| #define ES0_WRP 0x10 /* *write prot */ | |
| #define ES0_ERR 0x08 /* error */ | |
| #define ES0_DEF 0x04 /* def trk NI */ | |
| #define ES0_DEL 0x02 /* del rec NI */ | |
| #define ES0_FLT 0x01 /* fault */ | |
| #define ES1_TK0 0x80 /* track 0 */ | |
| #define ES1_NRDY 0x40 /* not ready */ | |
| #define ES1_NOAM 0x20 /* no addr mk NI */ | |
| #define ES1_CMD 0x10 /* illegal cmd */ | |
| #define ES1_SKE 0x08 /* seek err NI */ | |
| #define ES1_UNS 0x04 /* unsafe NI */ | |
| #define ES1_UNIT 0x03 /* unit # */ | |
| /* Processing options for commands */ | |
| #define C_RD 0x1 /* cmd reads disk */ | |
| #define C_WD 0x2 /* cmd writes disk */ | |
| extern uint32 int_req[INTSZ], int_enb[INTSZ]; | |
| uint32 fd_sta = 0; /* status */ | |
| uint32 fd_cmd = 0; /* command */ | |
| uint32 fd_db = 0; /* data buffer */ | |
| uint32 fd_bptr = 0; /* buffer pointer */ | |
| uint8 fdxb[FD_NUMBY] = { 0 }; /* sector buffer */ | |
| uint8 fd_es[FD_NUMDR][ES_SIZE] = { 0 }; /* ext status */ | |
| uint32 fd_lrn = 0; /* log rec # */ | |
| uint32 fd_wdv = 0; /* wd valid */ | |
| uint32 fd_stopioe = 1; /* stop on error */ | |
| uint32 fd_arm = 0; /* intr arm */ | |
| int32 fd_ctime = 100; /* command time */ | |
| int32 fd_stime = 10; /* seek, per LRN */ | |
| int32 fd_xtime = 1; /* tr set time */ | |
| static uint32 ctab[16] = { | |
| 0, C_RD, C_WD, 0, /* 0, rd, wr, 0 */ | |
| 0, C_WD, C_RD, 0, /* 0, del, boot, 0 */ | |
| 0, 0, 0, 0, | |
| 0, 0, 0, 0 | |
| }; | |
| DEVICE fd_dev; | |
| uint32 fd (uint32 dev, uint32 op, uint32 dat); | |
| t_stat fd_svc (UNIT *uptr); | |
| t_stat fd_reset (DEVICE *dptr); | |
| t_stat fd_clr (DEVICE *dptr); | |
| t_stat fd_boot (int32 unitno, DEVICE *dptr); | |
| t_bool fd_dte (UNIT *uptr, t_bool wr); | |
| uint32 fd_crc (uint32 crc, uint32 dat, uint32 cnt); | |
| void fd_done (uint32 u, uint32 nsta, uint32 nes0, uint32 nes1); | |
| void sched_seek (UNIT *uptr, int32 newlrn); | |
| /* FD data structures | |
| fd_dev FD device descriptor | |
| fd_unit FD unit list | |
| fd_reg FD register list | |
| fd_mod FD modifier list | |
| */ | |
| DIB fd_dib = { d_FD, -1, v_FD, NULL, &fd, NULL }; | |
| UNIT fd_unit[] = { | |
| { UDATA (&fd_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+ | |
| UNIT_BUFABLE+UNIT_MUSTBUF, FD_SIZE + FD_NUMLRN) }, | |
| { UDATA (&fd_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+ | |
| UNIT_BUFABLE+UNIT_MUSTBUF, FD_SIZE + FD_NUMLRN) }, | |
| { UDATA (&fd_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+ | |
| UNIT_BUFABLE+UNIT_MUSTBUF, FD_SIZE + FD_NUMLRN) }, | |
| { UDATA (&fd_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+ | |
| UNIT_BUFABLE+UNIT_MUSTBUF, FD_SIZE + FD_NUMLRN) } | |
| }; | |
| REG fd_reg[] = { | |
| { HRDATA (CMD, fd_cmd, 8) }, | |
| { HRDATA (STA, fd_sta, 8) }, | |
| { HRDATA (BUF, fd_db, 8) }, | |
| { HRDATA (LRN, fd_lrn, 16) }, | |
| { BRDATA (ESTA, fd_es, 16, 8, ES_SIZE * FD_NUMDR) }, | |
| { BRDATA (DBUF, fdxb, 16, 8, FD_NUMBY) }, | |
| { HRDATA (DBPTR, fd_bptr, 8) }, | |
| { FLDATA (WDV, fd_wdv, 0) }, | |
| { FLDATA (IREQ, int_req[l_FD], i_FD) }, | |
| { FLDATA (IENB, int_enb[l_FD], i_FD) }, | |
| { FLDATA (IARM, fd_arm, 0) }, | |
| { DRDATA (CTIME, fd_ctime, 24), PV_LEFT }, | |
| { DRDATA (STIME, fd_stime, 24), PV_LEFT }, | |
| { DRDATA (XTIME, fd_xtime, 24), PV_LEFT }, | |
| { FLDATA (STOP_IOE, fd_stopioe, 0) }, | |
| { URDATA (ULRN, fd_unit[0].LRN, 16, 16, 0, FD_NUMDR, REG_HRO) }, | |
| { URDATA (UFNC, fd_unit[0].FNC, 16, 8, 0, FD_NUMDR, REG_HRO) }, | |
| { HRDATA (DEVNO, fd_dib.dno, 8), REG_HRO }, | |
| { NULL } | |
| }; | |
| MTAB fd_mod[] = { | |
| { UNIT_WLK, 0, "write enabled", "WRITEENABLED", NULL }, | |
| { UNIT_WLK, UNIT_WLK, "write locked", "LOCKED", NULL }, | |
| { MTAB_XTD|MTAB_VDV, 0, "DEVNO", "DEVNO", | |
| &set_dev, &show_dev, NULL }, | |
| { 0 } | |
| }; | |
| DEVICE fd_dev = { | |
| "FD", fd_unit, fd_reg, fd_mod, | |
| FD_NUMDR, 16, 20, 1, 16, 8, | |
| NULL, NULL, &fd_reset, | |
| &fd_boot, NULL, NULL, | |
| &fd_dib, DEV_DISABLE | |
| }; | |
| /* Floppy disk: IO routine */ | |
| uint32 fd (uint32 dev, uint32 op, uint32 dat) | |
| { | |
| int32 u, t, fnc; | |
| UNIT *uptr; | |
| fnc = GET_FNC (fd_cmd); /* get fnc */ | |
| u = GET_UNIT (fd_cmd); /* get unit */ | |
| uptr = fd_dev.units + u; | |
| switch (op) { /* case IO op */ | |
| case IO_ADR: /* select */ | |
| return BY; /* byte only */ | |
| case IO_RD: /* read */ | |
| if (fd_sta & (STA_IDL | STA_BSY)) /* idle, busy? */ | |
| return fd_db; | |
| if (fd_bptr < FD_NUMBY) /* get byte */ | |
| fd_db = fdxb[fd_bptr++]; | |
| if (fd_bptr >= FD_NUMBY) { /* buf end? */ | |
| if (ctab[fnc] & C_RD) { /* disk read? */ | |
| sched_seek (uptr, uptr->LRN + 1); /* sched read */ | |
| fd_sta = fd_sta | STA_BSY; /* set busy */ | |
| } | |
| else fd_bptr = 0; /* just wrap */ | |
| } | |
| if ((ctab[fnc] & C_RD) && fd_arm) /* if rd & arm, */ | |
| SET_INT (v_FD); /* interrupt */ | |
| return fd_db; /* return buf */ | |
| case IO_WD: /* write */ | |
| if (fd_sta & STA_IDL) { /* idle? */ | |
| fd_lrn = ((fd_lrn << 8) | dat) & DMASK16; /* insert byte */ | |
| fd_wdv = 1; | |
| break; | |
| } | |
| if (fd_bptr < FD_NUMBY) /* if room, */ | |
| fdxb[fd_bptr++] = fd_db = dat; /* store byte */ | |
| if (fd_bptr >= FD_NUMBY) { /* buf end? */ | |
| if (ctab[fnc] & C_WD) { /* disk write? */ | |
| sched_seek (uptr, uptr->LRN + 1); /* sched write */ | |
| fd_sta = fd_sta | STA_BSY; /* set busy */ | |
| } | |
| else fd_bptr = 0; /* just wrap */ | |
| } | |
| if ((ctab[fnc] & C_WD) && fd_arm) /* if wr & arm, */ | |
| SET_INT (v_FD); /* interrupt */ | |
| break; | |
| case IO_SS: /* status */ | |
| t = fd_sta & STA_MASK; /* get status */ | |
| if ((uptr->flags & UNIT_ATT) == 0) | |
| t = t | STA_DU; | |
| if (t & SET_EX) /* test for ex */ | |
| t = t | STA_EX; | |
| return t; | |
| case IO_OC: /* command */ | |
| fd_arm = int_chg (v_FD, dat, fd_arm); /* upd int ctrl */ | |
| fnc = GET_FNC (dat); /* new fnc */ | |
| fd_cmd = dat; /* save cmd */ | |
| u = GET_UNIT (dat); /* get unit */ | |
| uptr = fd_dev.units + u; | |
| if (fnc == FNC_STOP) { /* stop? */ | |
| uptr->FNC = uptr->FNC | FNC_STOPPING; /* flag stop */ | |
| if (sim_is_active (uptr)) /* busy? cont */ | |
| break; | |
| if (ctab[GET_FNC (uptr->FNC)] & C_WD) { /* write? */ | |
| sched_seek (uptr, uptr->LRN + 1); /* sched write */ | |
| fd_sta = fd_sta | STA_BSY; /* set busy */ | |
| } | |
| else fd_done (u, 0, 0, 0); /* nrml done */ | |
| break; | |
| } | |
| else if (fd_sta & STA_IDL) { /* must be idle */ | |
| if (fnc != FNC_RSTA) { /* !rd status */ | |
| fd_sta = STA_BSY; /* busy, !idle */ | |
| fd_es[u][0] = 0; | |
| fd_es[u][1] = u; /* init ext sta */ | |
| } | |
| else fd_sta = (fd_sta & ~STA_IDL) | STA_BSY; | |
| if (fnc == FNC_BOOT) /* boot? fixed sec */ | |
| t = LRN_BOOT; | |
| else if (fd_wdv) /* valid data? use */ | |
| t = fd_lrn; | |
| else t = uptr->LRN; /* use prev */ | |
| fd_wdv = 0; /* data invalid */ | |
| fd_bptr = 0; /* init buffer */ | |
| uptr->FNC = fnc; /* save function */ | |
| uptr->LRN = t; /* save LRN */ | |
| if (ctab[fnc] & C_RD) /* seek now? */ | |
| sched_seek (uptr, t); | |
| else sim_activate (uptr, fd_ctime); /* start cmd */ | |
| } | |
| break; | |
| } | |
| return 0; | |
| } | |
| /* Unit service; the action to be taken depends on command */ | |
| t_stat fd_svc (UNIT *uptr) | |
| { | |
| uint32 i, u, tk, sc, crc, fnc, da; | |
| uint8 *fbuf = uptr->filebuf; | |
| u = uptr - fd_dev.units; /* get unit number */ | |
| fnc = GET_FNC (uptr->FNC); /* get function */ | |
| switch (fnc) { /* case on function */ | |
| case FNC_RESET: /* reset */ | |
| fd_clr (&fd_dev); /* clear device */ | |
| fd_done (u, 0, 0, 0); /* set idle */ | |
| return SCPE_OK; | |
| case FNC_STOP: /* stop */ | |
| fd_done (u, 0, 0, 0); /* set idle */ | |
| return SCPE_OK; | |
| case FNC_BOOT: /* boot, buf empty */ | |
| case FNC_RD: /* read, buf empty */ | |
| if (uptr->FNC & FNC_STOPPING) /* stopped? */ | |
| break; | |
| if (fd_dte (uptr, FALSE)) /* xfr error? */ | |
| return SCPE_OK; | |
| da = GET_DA (uptr->LRN); /* get disk addr */ | |
| for (i = 0; i < FD_NUMBY; i++) /* read sector */ | |
| fdxb[i] = fbuf[da + i]; | |
| if (fbuf[FD_SIZE + uptr->LRN - 1]) { /* deleted? set err */ | |
| fd_sta = fd_sta | STA_DEL; | |
| fd_es[u][0] = fd_es[u][0] | ES0_DEL; | |
| } | |
| fd_es[u][2] = GET_SEC (uptr->LRN); /* set ext sec/trk */ | |
| fd_es[u][3] = GET_TRK (uptr->LRN); | |
| fd_bptr = 0; /* init buf */ | |
| uptr->LRN = uptr->LRN + 1; /* next block */ | |
| break; | |
| case FNC_WR: case FNC_DEL: /* write block */ | |
| if (fd_dte (uptr, TRUE)) /* xfr error? */ | |
| return SCPE_OK; | |
| if (fd_bptr) { /* any transfer? */ | |
| da = GET_DA (uptr->LRN); /* get disk addr */ | |
| for (i = fd_bptr; i < FD_NUMBY; i++) /* pad sector */ | |
| fdxb[i] = fd_db; | |
| for (i = 0; i < FD_NUMBY; i++) /* write sector */ | |
| fbuf[da + i] = fdxb[i]; /* then dir */ | |
| fbuf[FD_SIZE + uptr->LRN - 1] = ((fnc == FNC_DEL)? 1: 0); | |
| uptr->hwmark = uptr->capac; /* rewrite all */ | |
| fd_es[u][2] = GET_SEC (uptr->LRN); /* set ext sec/trk */ | |
| fd_es[u][3] = GET_TRK (uptr->LRN); | |
| fd_bptr = 0; /* init buf */ | |
| uptr->LRN = uptr->LRN + 1; /* next block */ | |
| } | |
| break; | |
| case FNC_RSTA: /* read status */ | |
| if (uptr->flags & UNIT_WPRT) /* wr protected? */ | |
| fd_es[u][0] = fd_es[u][0] | ES0_WRP; | |
| if (GET_TRK (uptr->LRN) == 0) /* on track 0? */ | |
| fd_es[u][1] = fd_es[u][1] | ES1_TK0; | |
| if ((uptr->flags & UNIT_BUF) == 0) { /* not attached? */ | |
| fd_es[u][0] = fd_es[u][0] | ES0_FLT; /* set err */ | |
| fd_es[u][1] = fd_es[u][1] | ES1_NRDY; | |
| } | |
| for (i = 0; i < ES_SIZE; i++) /* copy to buf */ | |
| fdxb[i] = fd_es[u][i]; | |
| for (i = ES_SIZE; i < FD_NUMBY; i++) | |
| fdxb[i] = 0; | |
| break; | |
| case FNC_RDID: /* read ID */ | |
| if ((uptr->flags & UNIT_BUF) == 0) { /* not attached? */ | |
| fd_done (u, STA_ERR, ES0_ERR | ES0_FLT, ES1_NRDY); | |
| return SCPE_OK; | |
| } | |
| for (i = 0; i < FD_NUMBY; i++) fdxb[i] = 0; /* clr buf */ | |
| tk = GET_TRK (uptr->LRN); /* get track */ | |
| sc = GET_SEC (uptr->LRN); /* get sector */ | |
| fdxb[0] = tk & 0xFF; /* store track */ | |
| fdxb[2] = sc & 0xFF; /* store sector */ | |
| crc = fd_crc (0xFFFF, 0xFE00, 8); /* CRC addr mark */ | |
| crc = fd_crc (crc, tk << 8, 16); /* CRC track */ | |
| crc = fd_crc (crc, sc << 8, 16); /* CRC sector */ | |
| fdxb[4] = (crc >> 8) & 0xFF; /* store CRC */ | |
| fdxb[5] = crc & 0xFF; | |
| break; | |
| case FNC_FMT: /* format */ | |
| default: | |
| fd_done (u, STA_ERR, ES0_ERR, ES1_CMD); /* ill cmd */ | |
| uptr->LRN = 1; /* on track 0 */ | |
| return SCPE_OK; | |
| } | |
| if (uptr->FNC & FNC_STOPPING) { /* stopping? */ | |
| uptr->FNC = FNC_STOP; /* fnc = STOP */ | |
| sim_activate (uptr, fd_ctime); /* schedule */ | |
| } | |
| fd_sta = fd_sta & ~STA_BSY; /* clear busy */ | |
| if (fd_arm) /* if armed, int */ | |
| SET_INT (v_FD); | |
| return SCPE_OK; | |
| } | |
| /* Schedule seek */ | |
| void sched_seek (UNIT *uptr, int32 newlrn) | |
| { | |
| int32 diff = newlrn - uptr->LRN; /* LRN diff */ | |
| if (diff < 0) /* ABS */ | |
| diff = -diff; | |
| if (diff < 10) | |
| diff = 10; /* MIN 10 */ | |
| sim_activate (uptr, diff * fd_stime); /* schedule */ | |
| return; | |
| } | |
| /* Command complete */ | |
| void fd_done (uint32 u, uint32 nsta, uint32 nes0, uint32 nes1) | |
| { | |
| fd_sta = (fd_sta | STA_IDL | nsta) & ~STA_BSY; /* set idle */ | |
| if (fd_arm) /* if armed, int */ | |
| SET_INT (v_FD); | |
| fd_es[u][0] = fd_es[u][0] | nes0; /* set ext state */ | |
| fd_es[u][1] = fd_es[u][1] | nes1; | |
| return; | |
| } | |
| /* Test for data transfer error */ | |
| t_bool fd_dte (UNIT *uptr, t_bool wr) | |
| { | |
| uint32 u = uptr - fd_dev.units; | |
| if ((uptr->flags & UNIT_BUF) == 0) { /* not attached? */ | |
| fd_done (u, STA_ERR, ES0_ERR | ES0_FLT, ES1_NRDY); | |
| return TRUE; | |
| } | |
| if (wr && (uptr->flags & UNIT_WPRT)) { /* wr protected? */ | |
| fd_done (u, STA_ERR, ES0_ERR | ES0_WRP, 0); | |
| return TRUE; | |
| } | |
| if ((uptr->LRN == 0) || (uptr->LRN > FD_NUMLRN)) { /* bad LRN? */ | |
| fd_done (u, STA_ERR, ES0_ERR | ES0_LRN, 0); | |
| return TRUE; | |
| } | |
| return FALSE; | |
| } | |
| /* Header CRC calculation */ | |
| uint32 fd_crc (uint32 crc, uint32 dat, uint32 cnt) | |
| { | |
| uint32 i, wrk; | |
| for (i = 0; i < cnt; i++) { | |
| wrk = crc ^ dat; | |
| crc = (crc << 1) & DMASK16; | |
| if (wrk & SIGN16) | |
| crc = ((crc ^ 0x1020) + 1) & DMASK16; | |
| dat = (dat << 1) & DMASK16; | |
| } | |
| return crc; | |
| } | |
| /* Reset routine */ | |
| t_stat fd_clr (DEVICE *dptr) | |
| { | |
| int32 i, j; | |
| UNIT *uptr; | |
| fd_sta = STA_IDL; /* idle */ | |
| fd_cmd = 0; /* clear state */ | |
| fd_db = 0; | |
| fd_bptr = 0; | |
| fd_lrn = 1; | |
| fd_wdv = 0; | |
| for (i = 0; i < FD_NUMBY; i++) fdxb[i] = 0; /* clr xfr buf */ | |
| for (i = 0; i < FD_NUMDR; i++) { /* loop thru units */ | |
| for (j = 0; j < ES_SIZE; j++) fd_es[i][j] = 0; /* clr ext sta */ | |
| fd_es[i][2] = 1; /* sector 1 */ | |
| uptr = fd_dev.units + i; | |
| sim_cancel (uptr); /* stop drive */ | |
| uptr->LRN = 1; /* clear state */ | |
| uptr->FNC = 0; | |
| } | |
| return SCPE_OK; | |
| } | |
| t_stat fd_reset (DEVICE *dptr) | |
| { | |
| CLR_INT (v_FD); /* clear int */ | |
| CLR_ENB (v_FD); /* disable int */ | |
| fd_arm = 0; /* disarm int */ | |
| return fd_clr (dptr);; | |
| } | |
| /* Bootstrap routine */ | |
| #define BOOT_START 0x50 | |
| #define BOOT_LEN (sizeof (boot_rom) / sizeof (uint8)) | |
| static uint8 boot_rom[] = { | |
| 0xD5, 0x00, 0x00, 0xCF, /* ST: AL CF */ | |
| 0x43, 0x00, 0x00, 0x80 /* BR 80 */ | |
| }; | |
| t_stat fd_boot (int32 unitno, DEVICE *dptr) | |
| { | |
| extern uint32 PC, dec_flgs; | |
| extern uint16 decrom[]; | |
| if (decrom[0xD5] & dec_flgs) /* AL defined? */ | |
| return SCPE_NOFNC; | |
| IOWriteBlk (BOOT_START, BOOT_LEN, boot_rom); /* copy boot */ | |
| IOWriteB (AL_DEV, fd_dib.dno); /* set dev no */ | |
| IOWriteB (AL_IOC, 0x86 + (unitno << CMD_V_UNIT)); /* set dev cmd, unit num */ | |
| IOWriteB (AL_SCH, 0); /* clr sch dev no */ | |
| PC = BOOT_START; | |
| return SCPE_OK; | |
| } |