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- /* RL11 (RLV12) cartridge disk simulator
-
- Copyright (c) 1994, 1995, Robert M Supnik, Digital Equipment Corporation
- Commercial use prohibited
-
- The RL11 is a four drive cartridge disk subsystem. An RL01 drive
- consists of 256 cylinders, each with 2 surfaces containing 40 sectors
- of 256 bytes. An RL02 drive has 512 cylinders. The RLV12 is a
- controller variant which supports 22b direct addressing.
-
- The most complicated part of the RL11 controller is the way it does
- seeks. Seeking is relative to the current disk address; this requires
- keeping accurate track of the current cylinder. The RL01 will not
- switch heads or cross cylinders during transfers.
- */
-
- #include "pdp11_defs.h"
-
- /* Constants */
-
- #define RL_NUMWD 128 /* words/sector */
- #define RL_NUMSC 40 /* sectors/surface */
- #define RL_NUMSF 2 /* surfaces/cylinder */
- #define RL_NUMCY 256 /* cylinders/drive */
- #define RL_NUMDR 4 /* drives/controller */
- #define RL01_SIZE (RL_NUMCY * RL_NUMSF * RL_NUMSC * RL_NUMWD) /* words/drive */
- #define RL02_SIZE (RL01_SIZE * 2) /* words/drive */
- #define RL_MAXMEM (MEMSIZE / sizeof (short)) /* words/memory */
-
- /* Flags in the unit flags word */
-
- #define UNIT_V_HWLK (UNIT_V_UF) /* hwre write lock */
- #define UNIT_V_RL02 (UNIT_V_UF+1) /* RL01 vs RL02 */
- #define UNIT_V_AUTO (UNIT_V_UF+2) /* autosize enable */
- #define UNIT_W_UF 3 /* saved flags width */
- #define UNIT_HWLK (1u << UNIT_V_HWLK)
- #define UNIT_RL02 (1u << UNIT_V_RL02)
- #define UNIT_AUTO (1u << UNIT_V_AUTO)
-
- /* Parameters in the unit descriptor */
-
- #define TRK u3 /* current track */
- #define STAT u4 /* status */
-
- /* RLDS */
-
- #define RLDS_LOAD 0 /* no cartridge */
- #define RLDS_LOCK 5 /* lock on */
- #define RLDS_BHO 0000010 /* brushes home */
- #define RLDS_HDO 0000020 /* heads out */
- #define RLDS_CVO 0000040 /* cover open */
- #define RLDS_HD 0000100 /* head select */
- #define RLDS_DSE 0000400 /* drive select err */
- #define RLDS_RL02 0000200 /* RL02 */
- #define RLDS_VCK 0001000 /* volume check */
- #define RLDS_WGE 0002000 /* write gate err */
- #define RLDS_SPE 0004000 /* spin err */
- #define RLDS_STO 0010000 /* seek time out */
- #define RLDS_WLK 0020000 /* write locked */
- #define RLDS_HCE 0040000 /* head current err */
- #define RLDS_WDE 0100000 /* write data err */
- #define RLDS_ATT (RLDS_HDO+RLDS_BHO+RLDS_LOCK) /* attached status */
- #define RLDS_UNATT (RLDS_CVO+RLDS_LOAD) /* unattached status */
- #define RLDS_ERR (RLDS_WDE+RLDS_HCE+RLDS_STO+RLDS_SPE+RLDS_WGE+ \
- RLDS_VCK+RLDS_DSE) /* errors bits */
-
- /* RLCS */
-
- #define RLCS_DRDY 0000001 /* drive ready */
- #define RLCS_M_FUNC 0000007 /* function */
- #define RLCS_NOP 0
- #define RLCS_WCHK 1
- #define RLCS_GSTA 2
- #define RLCS_SEEK 3
- #define RLCS_RHDR 4
- #define RLCS_WRITE 5
- #define RLCS_READ 6
- #define RLCS_RNOHDR 7
- #define RLCS_V_FUNC 1
- #define RLCS_M_MEX 03 /* memory extension */
- #define RLCS_V_MEX 4
- #define RLCS_MEX (RLCS_M_MEX << RLCS_V_MEX)
- #define RLCS_M_DRIVE 03
- #define RLCS_V_DRIVE 8
- #define RLCS_INCMP 0002000 /* incomplete */
- #define RLCS_CRC 0004000 /* CRC error */
- #define RLCS_HDE 0010000 /* header error */
- #define RLCS_NXM 0020000 /* non-exist memory */
- #define RLCS_DRE 0040000 /* drive error */
- #define RLCS_ERR 0100000 /* error summary */
- #define RLCS_ALLERR (RLCS_ERR+RLCS_DRE+RLCS_NXM+RLCS_HDE+RLCS_CRC+RLCS_INCMP)
- #define RLCS_RW 0001776 /* read/write */
- #define GET_FUNC(x) (((x) >> RLCS_V_FUNC) & RLCS_M_FUNC)
- #define GET_DRIVE(x) (((x) >> RLCS_V_DRIVE) & RLCS_M_DRIVE)
-
- /* RLDA */
-
- #define RLDA_SK_DIR 0000004 /* direction */
- #define RLDA_GS_CLR 0000010 /* clear errors */
- #define RLDA_SK_HD 0000020 /* head select */
-
- #define RLDA_V_SECT 0 /* sector */
- #define RLDA_M_SECT 077
- #define RLDA_V_TRACK 6 /* track */
- #define RLDA_M_TRACK 01777
- #define RLDA_HD0 (0 << RLDA_V_TRACK)
- #define RLDA_HD1 (1u << RLDA_V_TRACK)
- #define RLDA_V_CYL 7 /* cylinder */
- #define RLDA_M_CYL 0777
- #define RLDA_TRACK (RLDA_M_TRACK << RLDA_V_TRACK)
- #define RLDA_CYL (RLDA_M_CYL << RLDA_V_CYL)
- #define GET_SECT(x) (((x) >> RLDA_V_SECT) & RLDA_M_SECT)
- #define GET_CYL(x) (((x) >> RLDA_V_CYL) & RLDA_M_CYL)
- #define GET_TRACK(x) (((x) >> RLDA_V_TRACK) & RLDA_M_TRACK)
- #define GET_DA(x) ((GET_TRACK (x) * RL_NUMSC) + GET_SECT (x))
-
- /* RLBA */
-
- #define RLBA_IMP 0177776 /* implemented */
-
- /* RLBAE */
-
- #define RLBAE_IMP 0000077 /* implemented */
-
- extern int int_req;
- extern unsigned short M[]; /* memory */
- int rlcs = 0; /* control/status */
- int rlba = 0; /* memory address */
- int rlbae = 0; /* mem addr extension */
- int rlda = 0; /* disk addr */
- int rlmp = 0, rlmp1 = 0, rlmp2 = 0; /* mp register queue */
- int rl_swait = 10; /* seek wait */
- int rl_rwait = 10; /* rotate wait */
- int rl_stopioe = 1; /* stop on error */
- int rl_svc (UNIT *uptr);
- int rl_reset (DEVICE *dptr);
- void rl_set_done (int error);
- int rl_boot (int unitno);
- int rl_attach (UNIT *uptr, char *cptr);
- int rl_set_size (UNIT *uptr, int value);
- extern int sim_activate (UNIT *uptr, int interval);
- extern int sim_cancel (UNIT *uptr);
- extern int sim_is_active (UNIT *uptr);
- extern int attach_unit (UNIT *uptr, char *cptr);
-
- /* RL11 data structures
-
- rl_dev RL device descriptor
- rl_unit RL unit list
- rl_reg RL register list
- rl_mod RL modifier list
- */
-
- UNIT rl_unit[] = {
- { UDATA (&rl_svc, UNIT_FIX+UNIT_ATTABLE, RL01_SIZE) },
- { UDATA (&rl_svc, UNIT_FIX+UNIT_ATTABLE, RL01_SIZE) },
- { UDATA (&rl_svc, UNIT_FIX+UNIT_ATTABLE, RL01_SIZE) },
- { UDATA (&rl_svc, UNIT_FIX+UNIT_ATTABLE, RL01_SIZE) } };
-
- REG rl_reg[] = {
- { ORDATA (RLCS, rlcs, 16) },
- { ORDATA (RLDA, rlda, 16) },
- { ORDATA (RLBA, rlba, 16) },
- { ORDATA (RLBAE, rlbae, 6) },
- { ORDATA (RLMP, rlmp, 16) },
- { ORDATA (RLMP1, rlmp1, 16) },
- { ORDATA (RLMP2, rlmp2, 16) },
- { FLDATA (INT, int_req, INT_V_RL) },
- { FLDATA (ERR, rlcs, CSR_V_ERR) },
- { FLDATA (DONE, rlcs, CSR_V_DONE) },
- { FLDATA (IE, rlcs, CSR_V_IE) },
- { DRDATA (STIME, rl_swait, 24), PV_LEFT },
- { DRDATA (RTIME, rl_rwait, 24), PV_LEFT },
- { GRDATA (FLG0, rl_unit[0].flags, 8, UNIT_W_UF, UNIT_V_UF), REG_HRO },
- { GRDATA (FLG1, rl_unit[1].flags, 8, UNIT_W_UF, UNIT_V_UF), REG_HRO },
- { GRDATA (FLG2, rl_unit[2].flags, 8, UNIT_W_UF, UNIT_V_UF), REG_HRO },
- { GRDATA (FLG3, rl_unit[3].flags, 8, UNIT_W_UF, UNIT_V_UF), REG_HRO },
- { DRDATA (CAPAC0, rl_unit[0].capac, 32), PV_LEFT + REG_HRO },
- { DRDATA (CAPAC1, rl_unit[1].capac, 32), PV_LEFT + REG_HRO },
- { DRDATA (CAPAC2, rl_unit[2].capac, 32), PV_LEFT + REG_HRO },
- { DRDATA (CAPAC3, rl_unit[3].capac, 32), PV_LEFT + REG_HRO },
- { FLDATA (STOP_IOE, rl_stopioe, 0) },
- { NULL } };
-
- MTAB rl_mod[] = {
- { UNIT_HWLK, 0, "write enabled", "ENABLED", NULL },
- { UNIT_HWLK, UNIT_HWLK, "write locked", "LOCKED", NULL },
- { (UNIT_RL02+UNIT_ATT), UNIT_ATT, "RL01", NULL, NULL },
- { (UNIT_RL02+UNIT_ATT), (UNIT_RL02+UNIT_ATT), "RL02", NULL, NULL },
- { (UNIT_AUTO+UNIT_RL02+UNIT_ATT), 0, "RL01", NULL, NULL },
- { (UNIT_AUTO+UNIT_RL02+UNIT_ATT), UNIT_RL02, "RL02", NULL, NULL },
- { (UNIT_AUTO+UNIT_ATT), UNIT_AUTO, "autosize", NULL, NULL },
- { UNIT_AUTO, UNIT_AUTO, NULL, "AUTOSIZE", NULL },
- { (UNIT_AUTO+UNIT_RL02), 0, NULL, "RL01", &rl_set_size },
- { (UNIT_AUTO+UNIT_RL02), UNIT_RL02, NULL, "RL02", &rl_set_size },
- { 0 } };
-
- DEVICE rl_dev = {
- "RL", rl_unit, rl_reg, rl_mod,
- RL_NUMDR, 8, 24, 1, 8, 16,
- NULL, NULL, &rl_reset,
- &rl_boot, &rl_attach, NULL };
-
- /* I/O dispatch routine, I/O addresses 17774400 - 17774407
-
- 17774400 RLCS read/write
- 17774402 RLBA read/write
- 17774404 RLDA read/write
- 17774406 RLMP read/write
- 17774410 RLBAE read/write
- */
-
- int rl_rd (int *data, int PA, int access)
- {
- UNIT *uptr;
-
- switch ((PA >> 1) & 07) { /* decode PA<2:1> */
- case 0: /* RLCS */
- rlcs = (rlcs & ~RLCS_MEX) | ((rlbae & RLCS_M_MEX) << RLCS_V_MEX);
- if (rlcs & RLCS_ALLERR) rlcs = rlcs | RLCS_ERR;
- uptr = rl_dev.units + GET_DRIVE (rlcs);
- if (sim_is_active (uptr)) rlcs = rlcs & ~RLCS_DRDY;
- else rlcs = rlcs | RLCS_DRDY; /* see if ready */
- *data = rlcs;
- return SCPE_OK;
- case 1: /* RLBA */
- *data = rlba & RLBA_IMP;
- return SCPE_OK;
- case 2: /* RLDA */
- *data = rlda;
- return SCPE_OK;
- case 3: /* RLMP */
- *data = rlmp;
- rlmp = rlmp1; /* ripple data */
- rlmp1 = rlmp2;
- return SCPE_OK;
- case 4: /* RLBAE */
- *data = rlbae & RLBAE_IMP;
- return SCPE_OK; } /* end switch */
- } /* end rl_rd */
-
- int rl_wr (int data, int PA, int access)
- {
- int curr, offs, newc, maxc;
- UNIT *uptr;
-
- switch ((PA >> 1) & 07) { /* decode PA<2:1> */
- case 0: /* RLCS */
- rlcs = (rlcs & ~RLCS_MEX) | ((rlbae & RLCS_M_MEX) << RLCS_V_MEX);
- if (rlcs & RLCS_ALLERR) rlcs = rlcs | RLCS_ERR;
- uptr = rl_dev.units + GET_DRIVE (data); /* get new drive */
- if (sim_is_active (uptr)) rlcs = rlcs & ~RLCS_DRDY;
- else rlcs = rlcs | RLCS_DRDY; /* see if ready */
-
- if (access == WRITEB) data = (PA & 1)?
- (rlcs & 0377) | (data << 8): (rlcs & ~0377) | data;
- rlcs = (rlcs & ~RLCS_RW) | (data & RLCS_RW);
- rlbae = (rlbae & ~RLCS_M_MEX) | ((rlcs >> RLCS_V_MEX) & RLCS_M_MEX);
- if (data & CSR_DONE) { /* ready set? */
- if ((data & CSR_IE) == 0) int_req = int_req & ~INT_RL;
- else if ((rlcs & (CSR_DONE + CSR_IE)) == CSR_DONE)
- int_req = int_req | INT_RL;
- return SCPE_OK; }
-
- int_req = int_req & ~INT_RL; /* clear interrupt */
- rlcs = rlcs & ~RLCS_ALLERR; /* clear errors */
- switch (GET_FUNC (rlcs)) { /* case on RLCS<3:1> */
- case RLCS_NOP: /* nop */
- rl_set_done (0);
- return SCPE_OK;
- case RLCS_SEEK: /* seek */
- curr = GET_CYL (uptr -> TRK); /* current cylinder */
- offs = GET_CYL (rlda); /* offset */
- if (rlda & RLDA_SK_DIR) { /* in or out? */
- newc = curr + offs; /* out */
- maxc = (uptr -> flags & UNIT_RL02)?
- RL_NUMCY * 2: RL_NUMCY;
- if (newc >= maxc) newc = maxc - 1; }
- else { newc = curr - offs; /* in */
- if (newc < 0) newc = 0; }
- uptr -> TRK = (newc << RLDA_V_CYL) | /* put on track */
- ((rlda & RLDA_SK_HD)? RLDA_HD1: RLDA_HD0);
- sim_activate (uptr, rl_swait * abs (newc - curr));
- return SCPE_OK;
- default: /* data transfer */
- sim_activate (uptr, rl_swait); /* activate unit */
- return SCPE_OK; } /* end switch func */
- return SCPE_OK; /* end case RLCS */
-
- case 1: /* RLBA */
- if (access == WRITEB) data = (PA & 1)?
- (rlba & 0377) | (data << 8): (rlba & ~0377) | data;
- rlba = data & RLBA_IMP;
- return SCPE_OK;
- case 2: /* RLDA */
- if (access == WRITEB) data = (PA & 1)?
- (rlda & 0377) | (data << 8): (rlda & ~0377) | data;
- rlda = data;
- return SCPE_OK;
- case 3: /* RLMP */
- if (access == WRITEB) data = (PA & 1)?
- (rlmp & 0377) | (data << 8): (rlmp & ~0377) | data;
- rlmp = rlmp1 = rlmp2 = data;
- return SCPE_OK;
- case 4: /* RLBAE */
- if (PA & 1) return;
- rlbae = data & RLBAE_IMP;
- rlcs = (rlcs & ~RLCS_MEX) | ((rlbae & RLCS_M_MEX) << RLCS_V_MEX);
- return SCPE_OK; } /* end switch */
- } /* end rl_wr */
-
- /* Service unit timeout
-
- If seek in progress, complete seek command
- Else complete data transfer command
-
- The unit control block contains the function and cylinder for
- the current command.
- */
-
- static unsigned short fill[RL_NUMWD] = { 0 };
- int rl_svc (UNIT *uptr)
- {
- int comp, err, awc, wc, maxwc;
- int func, pa, da, fillc;
-
- func = GET_FUNC (rlcs); /* get function */
- if (func == RLCS_GSTA) { /* get status */
- rlmp = uptr -> STAT | (uptr -> TRK & RLDS_HD) |
- ((uptr -> flags & UNIT_ATT)? RLDS_ATT: RLDS_UNATT);
- if (rlda & RLDA_GS_CLR) rlmp = rlmp & ~RLDS_ERR;
- if (uptr -> flags & UNIT_RL02) rlmp = rlmp | RLDS_RL02;
- if (uptr -> flags & UNIT_HWLK) rlmp = rlmp | RLDS_WLK;
- uptr -> STAT = rlmp2 = rlmp1 = rlmp;
- rl_set_done (0); /* done */
- return SCPE_OK; }
-
- if ((uptr -> flags & UNIT_ATT) == 0) { /* attached? */
- rlcs = rlcs & ~RLCS_DRDY; /* clear drive ready */
- rl_set_done (RLCS_ERR | RLCS_INCMP); /* flag error */
- return IORETURN (rl_stopioe, SCPE_UNATT); }
-
- if ((func == RLCS_WRITE) && (uptr -> flags & UNIT_HWLK)) {
- uptr -> STAT = uptr -> STAT | RLDS_WGE; /* write and locked */
- rl_set_done (RLCS_ERR | RLCS_DRE);
- return SCPE_OK; }
-
- if (func == RLCS_SEEK) { /* seek? */
- rl_set_done (0); /* done */
- return SCPE_OK; }
-
- if (func == RLCS_RHDR) { /* read header? */
- rlmp = (uptr -> TRK & RLDA_TRACK) | GET_SECT (rlda);
- rlmp1 = 0;
- rl_set_done (0); /* done */
- return SCPE_OK; }
-
- if (((func != RLCS_RNOHDR) && ((uptr -> TRK & RLDA_CYL) != (rlda & RLDA_CYL)))
- || (GET_SECT (rlda) >= RL_NUMSC)) { /* bad cyl or sector? */
- rl_set_done (RLCS_ERR | RLCS_HDE | RLCS_INCMP); /* wrong cylinder? */
- return SCPE_OK; }
-
- pa = ((rlbae << 16) | rlba) >> 1; /* form phys addr */
- da = GET_DA (rlda) * RL_NUMWD; /* get disk addr */
- wc = 0200000 - rlmp; /* get true wc */
-
- maxwc = (RL_NUMSC - GET_SECT (rlda)) * RL_NUMWD; /* max transfer */
- if (wc > maxwc) wc = maxwc; /* track overrun? */
- if ((pa + wc) > RL_MAXMEM) { /* mem overrun? */
- rlcs = rlcs | RLCS_ERR | RLCS_NXM;
- wc = (RL_MAXMEM - pa); }
- if (wc < 0) { /* abort transfer? */
- rl_set_done (RLCS_INCMP);
- return SCPE_OK; }
-
- err = fseek (uptr -> fileref, da * sizeof (short), SEEK_SET);
- if ((func >= RLCS_READ) && (err == 0)) { /* read (no hdr)? */
- awc = fread (&M[pa], sizeof (short), wc, uptr -> fileref);
- for ( ; awc < wc; awc++) M[pa + awc] = 0;
- err = ferror (uptr -> fileref); }
-
- if ((func == RLCS_WRITE) && (err == 0)) { /* write? */
- fwrite (&M[pa], sizeof (short), wc, uptr -> fileref);
- err = ferror (uptr -> fileref);
- if ((err == 0) && (fillc = (wc & (RL_NUMWD - 1)))) {
- fwrite (fill, sizeof (short), fillc, uptr -> fileref);
- err = ferror (uptr -> fileref); } }
-
- if ((func == RLCS_WCHK) && (err == 0)) { /* write check? */
- fillc = wc; /* xfer length */
- for (wc = 0; (err == 0) && (wc < fillc); wc++) {
- awc = fread (&comp, sizeof (short), 1, uptr -> fileref);
- if (awc == 0) comp = 0;
- if (comp != M[pa + wc]) rlcs = rlcs | RLCS_ERR | RLCS_CRC; }
- err = ferror (uptr -> fileref); }
-
- rlmp = (rlmp + wc) & 0177777; /* final word count */
- if (rlmp != 0) rlcs = rlcs | RLCS_ERR | RLCS_INCMP; /* completed? */
- pa = (pa + wc) << 1; /* final byte addr */
- rlbae = (pa >> 16) & RLBAE_IMP; /* upper 6b */
- rlba = pa & RLBA_IMP; /* lower 16b */
- rlcs = (rlcs & ~RLCS_MEX) | ((rlbae & RLCS_M_MEX) << RLCS_V_MEX);
- rlda = rlda + ((wc + (RL_NUMWD - 1)) / RL_NUMWD);
- rl_set_done (0);
-
- if (err != 0) { /* error? */
- perror ("RL I/O error");
- clearerr (uptr -> fileref);
- return SCPE_IOERR; }
- return SCPE_OK;
- }
-
- /* Set done and possibly errors */
-
- void rl_set_done (int status)
- {
- rlcs = rlcs | status | CSR_DONE; /* set done */
- if (rlcs & CSR_IE) int_req = int_req | INT_RL;
- else int_req = int_req & ~INT_RL;
- return;
- }
-
- /* Device reset
-
- Note that the RL11 does NOT recalibrate its drives on RESET
- */
-
- int rl_reset (DEVICE *dptr)
- {
- int i;
- UNIT *uptr;
-
- rlcs = CSR_DONE;
- rlda = rlba = rlbae = rlmp = rlmp1 = rlmp2 = 0;
- int_req = int_req & ~INT_RL;
- for (i = 0; i < RL_NUMDR; i++) {
- uptr = rl_dev.units + i;
- sim_cancel (uptr);
- uptr -> STAT = 0; }
- return SCPE_OK;
- }
-
- /* Attach routine */
-
- int rl_attach (UNIT *uptr, char *cptr)
- {
- int p, r;
-
- uptr -> capac = (uptr -> flags & UNIT_RL02)? RL02_SIZE: RL01_SIZE;
- r = attach_unit (uptr, cptr);
- if ((r != SCPE_OK) || ((uptr -> flags & UNIT_AUTO) == 0)) return r;
- if (fseek (uptr -> fileref, 0, SEEK_END)) return SCPE_OK;
- if ((p = ftell (uptr -> fileref)) == 0) return SCPE_OK;
- if (p > (RL01_SIZE * sizeof (short))) {
- uptr -> flags = uptr -> flags | UNIT_RL02;
- uptr -> capac = RL02_SIZE; }
- else { uptr -> flags = uptr -> flags & ~UNIT_RL02;
- uptr -> capac = RL01_SIZE; }
- return SCPE_OK;
- }
-
- /* Set size routine */
-
- int rl_set_size (UNIT *uptr, int value)
- {
- if (uptr -> flags & UNIT_ATT) return SCPE_ALATT;
- uptr -> capac = (value & UNIT_RL02)? RL02_SIZE: RL01_SIZE;
- return SCPE_OK;
- }
-
- /* Device bootstrap */
-
- #define BOOT_START 02000 /* start */
- #define BOOT_UNIT 02006 /* where to store unit number */
- #define BOOT_LEN (sizeof (boot_rom) / sizeof (int))
-
- static const int boot_rom[] = {
- 0012706, 0002000, /* MOV #2000, SP */
- 0012700, 0000000, /* MOV #UNIT, R0 */
- 0010003, /* MOV R0, R3 */
- 0000303, /* SWAB R3 */
- 0012701, 0174400, /* MOV #RLCS, R1 ; csr */
- 0012761, 0000013, 0000004, /* MOV #13, 4(R1) ; clr err */
- 0052703, 0000004, /* BIS #4, R3 ; unit+gstat */
- 0010311, /* MOV R3, (R1) ; issue cmd */
- 0105711, /* TSTB (R1) ; wait */
- 0100376, /* BPL .-2 */
- 0105003, /* CLRB R3 */
- 0052703, 0000010, /* BIS #10, R3 ; unit+rdhdr */
- 0010311, /* MOV R3, (R1) ; issue cmd */
- 0105711, /* TSTB (R1) ; wait */
- 0100376, /* BPL .-2 */
- 0016102, 0000006, /* MOV 6(R1), R2 ; get hdr */
- 0042702, 0000077, /* BIC #77, R2 ; clr sector */
- 0005202, /* INC R2 ; magic bit */
- 0010261, 0000004, /* MOV R2, 4(R1) ; seek to 0 */
- 0105003, /* CLRB R3 */
- 0052703, 0000006, /* BIS #6, R3 ; unit+seek */
- 0010311, /* MOV R3, (R1) ; issue cmd */
- 0105711, /* TSTB (R1) ; wait */
- 0100376, /* BPL .-2 */
- 0005061, 0000002, /* CLR 2(R1) ; clr ba */
- 0005061, 0000004, /* CLR 4(R1) ; clr da */
- 0012761, 0177000, 0000006, /* MOV #-512., 6(R1) ; set wc */
- 0105003, /* CLRB R3 */
- 0052703, 0000014, /* BIS #14, R3 ; unit+read */
- 0010311, /* MOV R3, (R1) ; issue cmd */
- 0105711, /* TSTB (R1) ; wait */
- 0100376, /* BPL .-2 */
- 0042711, 0000377, /* BIC #377, (R1) */
- 0005002, /* CLR R2 */
- 0005003, /* CLR R3 */
- 0005004, /* CLR R4 */
- 0012705, 0062154, /* MOV "DL, R5 */
- 0005007 /* CLR PC */
- };
-
- int rl_boot (int unitno)
- {
- int i;
- extern int saved_PC;
-
- for (i = 0; i < BOOT_LEN; i++) M[(BOOT_START >> 1) + i] = boot_rom[i];
- M[BOOT_UNIT >> 1] = unitno & RLCS_M_DRIVE;
- saved_PC = BOOT_START;
- return SCPE_OK;
- }
-