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/* hp2100_ms.c: HP 2100 13181B/13183B Digital Magnetic Tape Unit Interface simulator
Copyright (c) 1993-2016, Robert M. Supnik
Copyright (c) 2017, J. David Bryan
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 THE
AUTHOR 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 names of the authors shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the authors.
MS 13181B Digital Magnetic Tape Unit Interface
13183B Digital Magnetic Tape Unit Interface
20-Jul-17 JDB Removed "msc_stopioe" variable and register
11-Jul-17 JDB Renamed "ibl_copy" to "cpu_ibl"
15-Mar-17 JDB Trace flags are now global
Changed DEBUG_PRI calls to tprintfs
13-Mar-17 JDB Deprecated LOCKED/WRITEENABLED for ATTACH -R
10-Mar-17 JDB Added IOBUS to the debug table
27-Feb-17 JDB ibl_copy no longer returns a status code
17-Jan-17 JDB Modified to use "odd_parity" array in hp2100_sys.c
13-May-16 JDB Modified for revised SCP API function parameter types
30-Dec-14 JDB Added S-register parameters to ibl_copy
24-Dec-14 JDB Use T_ADDR_FMT with t_addr values for 64-bit compatibility
Added casts for explicit downward conversions
11-Dec-14 JDB Updated for new erase gap API, added CRCC/LRCC support
10-Jan-13 MP Added DEV_TAPE to DEVICE flags
09-May-12 JDB Separated assignments from conditional expressions
10-Feb-12 JDB Deprecated DEVNO in favor of SC
Added CNTLR_TYPE cast to ms_settype
28-Mar-11 JDB Tidied up signal handling
26-Oct-10 JDB Changed I/O signal handler for revised signal model
11-Aug-08 JDB Revised to use AR instead of saved_AR in boot
26-Jun-08 JDB Rewrote device I/O to model backplane signals
28-Dec-06 JDB Added ioCRS state to I/O decoders
18-Sep-06 JDB Fixed 2nd CLR after WC causing another write
Improve debug reporting, add debug flags
14-Sep-06 JDB Removed local BOT flag, now uses sim_tape_bot
30-Aug-06 JDB Added erase gap support, improved tape lib err reporting
07-Jul-06 JDB Added CAPACITY as alternate for REEL
Fixed EOT test for unlimited reel size
16-Feb-06 RMS Revised for new EOT test
22-Jul-05 RMS Fixed compiler warning on Solaris (from Doug Glyn)
01-Mar-05 JDB Added SET OFFLINE; rewind/offline now does not detach
07-Oct-04 JDB Fixed enable/disable from either device
14-Aug-04 JDB Fixed many functional and timing problems (from Dave Bryan)
- fixed erroneous execution of rejected command
- fixed erroneous execution of select-only command
- fixed erroneous execution of clear command
- fixed odd byte handling for read
- fixed spurious odd byte status on 13183A EOF
- modified handling of end of medium
- added detailed timing, with fast and realistic modes
- added reel sizes to simulate end of tape
- added debug printouts
06-Jul-04 RMS Fixed spurious timing error after CLC (found by Dave Bryan)
26-Apr-04 RMS Fixed SFS x,C and SFC x,C
Fixed SR setting in IBL
Revised IBL loader
Implemented DMA SRQ (follows FLG)
25-Apr-03 RMS Revised for extended file support
28-Mar-03 RMS Added multiformat support
28-Feb-03 RMS Revised for magtape library
18-Oct-02 RMS Added BOOT command, added 13183A support
30-Sep-02 RMS Revamped error handling
29-Aug-02 RMS Added end of medium support
30-May-02 RMS Widened POS to 32b
22-Apr-02 RMS Added maximum record length test
References:
- 13181B Digital Magnetic Tape Unit Interface Kit Operating and Service Manual
(13181-90901, November 1982)
- 13183B Digital Magnetic Tape Unit Interface Kit Operating and Service Manual
(13183-90901, November 1983)
- SIMH Magtape Representation and Handling
(Bob Supnik, 30-Aug-2006)
*/
#include "hp2100_defs.h"
#include "hp2100_cpu.h"
#include "sim_tape.h"
#define UNIT_V_OFFLINE (MTUF_V_UF + 0) /* unit offline */
#define UNIT_OFFLINE (1 << UNIT_V_OFFLINE)
#define MS_NUMDR 4 /* number of drives */
#define DB_N_SIZE 16 /* max data buf */
#define DBSIZE (1 << DB_N_SIZE) /* max data cmd */
#define FNC u3 /* function */
#define UST u4 /* unit status */
#define REEL u5 /* tape reel size */
#define BPI_13181 MT_DENS_800 /* 800 bpi for 13181 cntlr */
#define BPI_13183 MT_DENS_1600 /* 1600 bpi for 13183 cntlr */
#define GAP_13181 48 /* gap is 4.8 inches for 13181 cntlr */
#define GAP_13183 30 /* gap is 3.0 inches for 13183 cntlr */
#define TCAP (300 * 12 * 800) /* 300 ft capacity at 800 bpi */
/* Command - msc_fnc */
#define FNC_CLR 00110 /* clear */
#define FNC_GAP 00015 /* write gap */
#define FNC_GFM 00215 /* gap+file mark */
#define FNC_RC 00023 /* read */
#define FNC_WC 00031 /* write */
#define FNC_FSR 00003 /* forward space */
#define FNC_BSR 00041 /* backward space */
#define FNC_FSF 00203 /* forward file */
#define FNC_BSF 00241 /* backward file */
#define FNC_REW 00101 /* rewind */
#define FNC_RWS 00105 /* rewind and offline */
#define FNC_WFM 00211 /* write file mark */
#define FNC_RFF 00223 /* read file fwd (diag) */
#define FNC_RRR 00061 /* read record rev (diag) */
#define FNC_CMPL 00400 /* completion state */
#define FNC_V_SEL 9 /* select */
#define FNC_M_SEL 017
#define FNC_GETSEL(x) (((x) >> FNC_V_SEL) & FNC_M_SEL)
#define FNF_MOT 00001 /* motion */
#define FNF_OFL 00004
#define FNF_WRT 00010 /* write */
#define FNF_REV 00040 /* reverse */
#define FNF_RWD 00100 /* rewind */
#define FNF_CHS 00400 /* change select */
#define FNC_SEL ((FNC_M_SEL << FNC_V_SEL) | FNF_CHS)
/* Status - stored in msc_sta, unit.UST (u), or dynamic (d) */
#define STA_PE 0100000 /* 1600 bpi (d) */
#define STA_V_SEL 13 /* unit sel (d) */
#define STA_M_SEL 03
#define STA_SEL (STA_M_SEL << STA_V_SEL)
#define STA_ODD 0004000 /* odd bytes */
#define STA_REW 0002000 /* rewinding (u) */
#define STA_TBSY 0001000 /* transport busy (d) */
#define STA_BUSY 0000400 /* ctrl busy */
#define STA_EOF 0000200 /* end of file */
#define STA_BOT 0000100 /* beg of tape (d) */
#define STA_EOT 0000040 /* end of tape (d) */
#define STA_TIM 0000020 /* timing error */
#define STA_REJ 0000010 /* programming error */
#define STA_WLK 0000004 /* write locked (d) */
#define STA_PAR 0000002 /* parity error */
#define STA_LOCAL 0000001 /* local (d) */
#define STA_DYN (STA_PE | STA_SEL | STA_TBSY | STA_BOT | \
STA_EOT | STA_WLK | STA_LOCAL)
/* Controller types */
typedef enum {
A13181,
A13183
} CNTLR_TYPE;
CNTLR_TYPE ms_ctype = A13181; /* ctrl type */
int32 ms_timing = 1; /* timing type */
struct {
FLIP_FLOP control; /* control flip-flop */
FLIP_FLOP flag; /* flag flip-flop */
FLIP_FLOP flagbuf; /* flag buffer flip-flop */
} msc = { CLEAR, CLEAR, CLEAR };
int32 msc_sta = 0; /* status */
int32 msc_buf = 0; /* buffer */
int32 msc_usl = 0; /* unit select */
int32 msc_1st = 0; /* first service */
struct {
FLIP_FLOP control; /* control flip-flop */
FLIP_FLOP flag; /* flag flip-flop */
FLIP_FLOP flagbuf; /* flag buffer flip-flop */
} msd = { CLEAR, CLEAR, CLEAR };
int32 msd_buf = 0; /* data buffer */
uint8 msxb[DBSIZE] = { 0 }; /* data buffer */
t_mtrlnt ms_ptr = 0, ms_max = 0; /* buffer ptrs */
t_bool ms_crc = FALSE; /* buffer ready for CRC calc */
/* Hardware timing at 45 IPS 13181 13183
(based on 1580 instr/msec) instr msec SCP instr msec SCP
-------------------- --------------------
- BOT start delay : btime = 161512 102.22 184 252800 160.00 288
- motion cmd start delay : ctime = 14044 8.89 16 17556 11.11 20
- GAP traversal time : gtime = 175553 111.11 200 105333 66.67 120
- IRG traversal time : itime = 24885 15.75 - 27387 17.33 -
- rewind initiation time : rtime = 878 0.56 1 878 0.56 1
- data xfer time / word : xtime = 88 55.56us - 44 27.78us -
NOTE: The 13181-60001 Rev. 1629 tape diagnostic fails test 17B subtest 6 with
"E116 BYTE TIME SHORT" if the correct data transfer time is used for
13181A interface. Set "xtime" to 115 (instructions) to pass that
diagnostic. Rev. 2040 of the tape diagnostic fixes this problem and
passes with the correct data transfer time.
*/
int32 msc_btime = 0; /* BOT start delay */
int32 msc_ctime = 0; /* motion cmd start delay */
int32 msc_gtime = 0; /* GAP traversal time */
int32 msc_itime = 0; /* IRG traversal time */
int32 msc_rtime = 0; /* rewind initiation time */
int32 msc_xtime = 0; /* data xfer time / word */
typedef int32 TIMESET[6]; /* set of controller times */
int32 *const timers [] = { &msc_btime, &msc_ctime, &msc_gtime,
&msc_itime, &msc_rtime, &msc_xtime };
const TIMESET msc_times [3] = {
{ 161512, 14044, 175553, 24885, 878, 88 }, /* 13181B */
{ 252800, 17556, 105333, 27387, 878, 44 }, /* 13183B */
{ 1, 1000, 1, 1, 100, 10 } /* FAST */
};
DEVICE msd_dev, msc_dev;
IOHANDLER msdio;
IOHANDLER mscio;
t_stat msc_svc (UNIT *uptr);
t_stat msc_reset (DEVICE *dptr);
t_stat msc_attach (UNIT *uptr, CONST char *cptr);
t_stat msc_detach (UNIT *uptr);
t_stat msc_online (UNIT *uptr, int32 value, CONST char *cptr, void *desc);
t_stat msc_boot (int32 unitno, DEVICE *dptr);
t_stat ms_write_gap (UNIT *uptr);
t_stat ms_map_err (UNIT *uptr, t_stat st);
t_stat ms_settype (UNIT *uptr, int32 val, CONST char *cptr, void *desc);
t_stat ms_showtype (FILE *st, UNIT *uptr, int32 val, CONST void *desc);
t_stat ms_set_timing (UNIT *uptr, int32 val, CONST char *cptr, void *desc);
t_stat ms_show_timing (FILE *st, UNIT *uptr, int32 val, CONST void *desc);
t_stat ms_set_reelsize (UNIT *uptr, int32 val, CONST char *cptr, void *desc);
t_stat ms_show_reelsize (FILE *st, UNIT *uptr, int32 val, CONST void *desc);
void ms_config_timing (void);
char *ms_cmd_name (uint32 cmd);
t_stat ms_clear (void);
static uint32 calc_crc_lrc (uint8 *buffer, t_mtrlnt length);
/* MSD data structures
msd_dev MSD device descriptor
msd_unit MSD unit list
msd_reg MSD register list
*/
DIB ms_dib[] = {
{ &msdio, MSD },
{ &mscio, MSC }
};
#define msd_dib ms_dib[0]
#define msc_dib ms_dib[1]
UNIT msd_unit = { UDATA (NULL, 0, 0) };
REG msd_reg[] = {
{ ORDATA (BUF, msd_buf, 16) },
{ FLDATA (CTL, msd.control, 0) },
{ FLDATA (FLG, msd.flag, 0) },
{ FLDATA (FBF, msd.flagbuf, 0) },
{ BRDATA (DBUF, msxb, 8, 8, DBSIZE) },
{ DRDATA (BPTR, ms_ptr, DB_N_SIZE + 1) },
{ DRDATA (BMAX, ms_max, DB_N_SIZE + 1) },
{ ORDATA (SC, msd_dib.select_code, 6), REG_HRO },
{ ORDATA (DEVNO, msd_dib.select_code, 6), REG_HRO },
{ NULL }
};
MTAB msd_mod [] = {
/* Entry Flags Value Print String Match String Validation Display Descriptor */
/* ------------------- ----- ------------ ------------ ------------ ------------- ---------------- */
{ MTAB_XDV, 2u, "SC", "SC", &hp_set_dib, &hp_show_dib, (void *) &ms_dib },
{ MTAB_XDV | MTAB_NMO, ~2u, "DEVNO", "DEVNO", &hp_set_dib, &hp_show_dib, (void *) &ms_dib },
{ 0 }
};
DEVICE msd_dev = {
"MSD", &msd_unit, msd_reg, msd_mod,
1, 10, DB_N_SIZE, 1, 8, 8,
NULL, NULL, &msc_reset,
NULL, NULL, NULL,
&msd_dib, DEV_DISABLE
};
/* MSC data structures
msc_dev MSC device descriptor
msc_unit MSC unit list
msc_reg MSC register list
msc_mod MSC modifier list
msc_deb MSC debug flags
*/
UNIT msc_unit[] = {
{ UDATA (&msc_svc, UNIT_ATTABLE | UNIT_ROABLE |
UNIT_DISABLE | UNIT_OFFLINE, 0) },
{ UDATA (&msc_svc, UNIT_ATTABLE | UNIT_ROABLE |
UNIT_DISABLE | UNIT_OFFLINE, 0) },
{ UDATA (&msc_svc, UNIT_ATTABLE | UNIT_ROABLE |
UNIT_DISABLE | UNIT_OFFLINE, 0) },
{ UDATA (&msc_svc, UNIT_ATTABLE | UNIT_ROABLE |
UNIT_DISABLE | UNIT_OFFLINE, 0) }
};
REG msc_reg[] = {
{ ORDATA (STA, msc_sta, 12) },
{ ORDATA (BUF, msc_buf, 16) },
{ ORDATA (USEL, msc_usl, 2) },
{ FLDATA (FSVC, msc_1st, 0) },
{ FLDATA (CTL, msc.control, 0) },
{ FLDATA (FLG, msc.flag, 0) },
{ FLDATA (FBF, msc.flagbuf, 0) },
{ URDATA (POS, msc_unit[0].pos, 10, T_ADDR_W, 0, MS_NUMDR, PV_LEFT) },
{ URDATA (FNC, msc_unit[0].FNC, 8, 8, 0, MS_NUMDR, REG_HRO) },
{ URDATA (UST, msc_unit[0].UST, 8, 12, 0, MS_NUMDR, REG_HRO) },
{ URDATA (REEL, msc_unit[0].REEL, 10, 2, 0, MS_NUMDR, REG_HRO) },
{ DRDATA (BTIME, msc_btime, 24), REG_NZ + PV_LEFT },
{ DRDATA (CTIME, msc_ctime, 24), REG_NZ + PV_LEFT },
{ DRDATA (GTIME, msc_gtime, 24), REG_NZ + PV_LEFT },
{ DRDATA (ITIME, msc_itime, 24), REG_NZ + PV_LEFT },
{ DRDATA (RTIME, msc_rtime, 24), REG_NZ + PV_LEFT },
{ DRDATA (XTIME, msc_xtime, 24), REG_NZ + PV_LEFT },
{ FLDATA (TIMING, ms_timing, 0), REG_HRO },
{ FLDATA (CTYPE, ms_ctype, 0), REG_HRO },
{ ORDATA (SC, msc_dib.select_code, 6), REG_HRO },
{ ORDATA (DEVNO, msc_dib.select_code, 6), REG_HRO },
{ NULL }
};
/* Modifier list.
The LOCKED and WRITEENABLED modifiers are deprecated. The supported method
of write-protecting a tape drive is to attach the tape image with the -R
(read-only) switch or by setting the host operating system's read-only
attribute on the tape image file. This simulates removing the write ring
from the tape reel before mounting it on the drive. There is no hardware
method of write-protecting a mounted and positioned tape reel.
Implementation notes:
1. The UNIT_RO modifier displays "write ring" if the flag is not set. There
is no corresponding entry for the opposite condition because "read only"
is automatically printed after the attached filename.
*/
MTAB msc_mod [] = {
/* Mask Value Match Value Print String Match String Validation Display Descriptor */
/* ------------- ------------- ---------------- --------------- ------------ ------- ---------- */
{ UNIT_RO, 0, "write ring", NULL, NULL, NULL, NULL },
{ UNIT_OFFLINE, UNIT_OFFLINE, "offline", "OFFLINE", NULL, NULL, NULL },
{ UNIT_OFFLINE, 0, "online", "ONLINE", &msc_online, NULL, NULL },
{ MTUF_WLK, 0, NULL, "WRITEENABLED", NULL, NULL, NULL },
{ MTUF_WLK, MTUF_WLK, NULL, "LOCKED", NULL, NULL, NULL },
/* Entry Flags Value Print String Match String Validation Display Descriptor */
/* ------------------- ----- ------------ ------------ ----------------- ------------------ ---------------- */
{ MTAB_XUN, 0, "CAPACITY", "CAPACITY", &ms_set_reelsize, &ms_show_reelsize, NULL },
{ MTAB_XUN | MTAB_NMO, 1, "REEL", "REEL", &ms_set_reelsize, &ms_show_reelsize, NULL },
{ MTAB_XUN, 0, "FORMAT", "FORMAT", &sim_tape_set_fmt, &sim_tape_show_fmt, NULL },
{ MTAB_XDV, 0, NULL, "13181A/B", &ms_settype, NULL, NULL },
{ MTAB_XDV, 1, NULL, "13183A/B", &ms_settype, NULL, NULL },
{ MTAB_XDV, 0, "TYPE", NULL, NULL, &ms_showtype, NULL },
{ MTAB_XDV, 0, NULL, "REALTIME", &ms_set_timing, NULL, NULL },
{ MTAB_XDV, 1, NULL, "FASTTIME", &ms_set_timing, NULL, NULL },
{ MTAB_XDV, 0, "TIMING", NULL, NULL, &ms_show_timing, NULL },
{ MTAB_XDV, 2u, "SC", "SC", &hp_set_dib, &hp_show_dib, (void *) &ms_dib },
{ MTAB_XDV | MTAB_NMO, ~2u, "DEVNO", "DEVNO", &hp_set_dib, &hp_show_dib, (void *) &ms_dib },
{ 0 }
};
DEBTAB msc_deb[] = {
{ "CMDS", DEB_CMDS },
{ "RWS", DEB_RWS },
{ "CPU", DEB_CPU },
{ "IOBUS", TRACE_IOBUS }, /* interface I/O bus signals and data words */
{ NULL, 0 }
};
DEVICE msc_dev = {
"MSC", msc_unit, msc_reg, msc_mod,
MS_NUMDR, 10, 31, 1, 8, 8,
NULL, NULL, &msc_reset,
&msc_boot, &msc_attach, &msc_detach,
&msc_dib, DEV_DISABLE | DEV_DEBUG | DEV_TAPE,
0, msc_deb, NULL, NULL
};
/* Data channel I/O signal handler */
uint32 msdio (DIB *dibptr, IOCYCLE signal_set, uint32 stat_data)
{
uint32 check;
IOSIGNAL signal;
IOCYCLE working_set = IOADDSIR (signal_set); /* add ioSIR if needed */
while (working_set) {
signal = IONEXT (working_set); /* isolate next signal */
switch (signal) { /* dispatch I/O signal */
case ioCLF: /* clear flag flip-flop */
msd.flag = msd.flagbuf = CLEAR;
break;
case ioSTF: /* set flag flip-flop */
case ioENF: /* enable flag */
msd.flag = msd.flagbuf = SET;
break;
case ioSFC: /* skip if flag is clear */
setstdSKF (msd);
break;
case ioSFS: /* skip if flag is set */
setstdSKF (msd);
break;
case ioIOI: /* I/O data input */
if (ms_crc) { /* ready for CRC? */
check = calc_crc_lrc (msxb, ms_max); /* calculate CRCC and LRCC */
msd_buf = check >> 8 & 0177400 /* position CRCC in upper byte */
| check & 0377; /* and LRCC in lower byte */
}
stat_data = IORETURN (SCPE_OK, msd_buf); /* merge in return status */
break;
case ioIOO: /* I/O data output */
msd_buf = IODATA (stat_data); /* store data */
break;
case ioPOPIO: /* power-on preset to I/O */
ms_clear (); /* issue CLR to controller */
break;
case ioCRS: /* control reset */
msd.flag = msd.flagbuf = SET; /* set flag and flag buffer */
/* fall into CLC handler */
case ioCLC: /* clear control flip-flop */
msd.control = CLEAR;
break;
case ioSTC: /* set control flip-flop */
ms_crc = FALSE; /* reset CRC ready */
msd.control = SET;
break;
case ioEDT: /* end data transfer */
msd.flag = msd.flagbuf = CLEAR; /* same as CLF */
break;
case ioSIR: /* set interrupt request */
setstdPRL (msd); /* set standard PRL signal */
setstdIRQ (msd); /* set standard IRQ signal */
setstdSRQ (msd); /* set standard SRQ signal */
break;
case ioIAK: /* interrupt acknowledge */
msd.flagbuf = CLEAR;
break;
default: /* all other signals */
break; /* are ignored */
}
working_set = working_set & ~signal; /* remove current signal from set */
}
return stat_data;
}
/* Command channel I/O signal handler.
Implementation notes:
1. Commands are usually initiated with an STC cc,C instruction. The CLR
command completes immediately and sets the flag. This requires that we
ignore the CLF part (but still process the SIR).
2. The command channel card clears its flag and flag buffer on EDT, but as
it never asserts SRQ, it will never get EDT. Under simulation, we omit
the EDT handler.
3. In hardware, the command channel card passes PRH to PRL. The data card
actually drives PRL with both channels' control and flag states. That
is, the priority chain is broken at the data card, even when the command
card is interrupting. This works in hardware, but we must break PRL at
the command card under simulation to allow the command card to interrupt.
*/
uint32 mscio (DIB *dibptr, IOCYCLE signal_set, uint32 stat_data)
{
static const uint8 map_sel[16] = {
0, 0, 1, 1, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3
};
uint16 data;
int32 sched_time;
UNIT *uptr = msc_dev.units + msc_usl;
IOSIGNAL signal;
IOCYCLE working_set = IOADDSIR (signal_set); /* add ioSIR if needed */
while (working_set) {
signal = IONEXT (working_set); /* isolate next signal */
switch (signal) { /* dispatch I/O signal */
case ioCLF: /* clear flag flip-flop */
msc.flag = msc.flagbuf = CLEAR;
break;
case ioSTF: /* set flag flip-flop */
case ioENF: /* enable flag */
msc.flag = msc.flagbuf = SET;
break;
case ioSFC: /* skip if flag is clear */
setstdSKF (msc);
break;
case ioSFS: /* skip if flag is set */
setstdSKF (msc);
break;
case ioIOI: /* I/O data input */
data = (uint16) (msc_sta & ~STA_DYN); /* get card status */
if ((uptr->flags & UNIT_OFFLINE) == 0) { /* online? */
data = data | (uint16) uptr->UST; /* add unit status */
if (sim_tape_bot (uptr)) /* BOT? */
data = data | STA_BOT;
if (sim_is_active (uptr) && /* TBSY unless RWD at BOT */
!((uptr->FNC & FNF_RWD) && sim_tape_bot (uptr)))
data = data | STA_TBSY;
if (sim_tape_wrp (uptr)) /* write prot? */
data = data | STA_WLK;
if (sim_tape_eot (uptr)) /* EOT? */
data = data | STA_EOT;
}
else
data = data | STA_TBSY | STA_LOCAL;
if (ms_ctype == A13183) /* 13183? */
data = data | STA_PE | (uint16) (msc_usl << STA_V_SEL);
tprintf (msc_dev, DEB_CPU, "Status = %06o\n", data);
stat_data = IORETURN (SCPE_OK, data); /* merge in return status */
break;
case ioIOO: /* I/O data output */
msc_buf = IODATA (stat_data); /* clear supplied status */
tprintf (msc_dev, DEB_CPU, "Command = %06o\n", msc_buf);
msc_sta = msc_sta & ~STA_REJ; /* clear reject */
if ((msc_buf & 0377) == FNC_CLR) /* clear always ok */
break;
if (msc_sta & STA_BUSY) { /* busy? reject */
msc_sta = msc_sta | STA_REJ; /* dont chg select */
break;
}
if (msc_buf & FNF_CHS) { /* select change */
msc_usl = map_sel[FNC_GETSEL (msc_buf)]; /* is immediate */
uptr = msc_dev.units + msc_usl;
tprintf (msc_dev, DEB_CMDS, "Unit %d selected\n", msc_usl);
}
if (((msc_buf & FNF_MOT) && sim_is_active (uptr)) ||
((msc_buf & FNF_REV) && sim_tape_bot (uptr)) ||
((msc_buf & FNF_WRT) && sim_tape_wrp (uptr)))
msc_sta = msc_sta | STA_REJ; /* reject? */
break;
case ioCRS: /* control reset */
msc.flag = msc.flagbuf = SET; /* set flag and flag buffer */
/* fall into CLC handler */
case ioCLC: /* clear control flip-flop */
msc.control = CLEAR;
break;
case ioSTC: /* set control flip-flop */
if (!(msc_sta & STA_REJ)) { /* last cmd rejected? */
if ((msc_buf & 0377) == FNC_CLR) { /* clear? */
ms_clear (); /* issue CLR to controller */
msc.control = SET; /* set CTL for STC */
msc.flag = msc.flagbuf = SET; /* set FLG for completion */
working_set = working_set & ~ioCLF; /* eliminate possible CLF */
tprintf (msc_dev, DEB_CMDS, "Controller cleared\n");
break; /* command completes immediately */
}
uptr->FNC = msc_buf & 0377; /* save function */
if (uptr->FNC & FNF_RWD) { /* rewind? */
if (!sim_tape_bot (uptr)) /* not at BOT? */
uptr->UST = STA_REW; /* set rewinding */
sched_time = msc_rtime; /* set response time */
}
else {
if (sim_tape_bot (uptr)) /* at BOT? */
sched_time = msc_btime; /* use BOT start time */
else if ((uptr->FNC == FNC_GAP) || (uptr->FNC == FNC_GFM))
sched_time = msc_gtime; /* use gap traversal time */
else sched_time = 0;
if (uptr->FNC != FNC_GAP)
sched_time += msc_ctime; /* add base command time */
}
if (msc_buf & ~FNC_SEL) { /* NOP for unit sel alone */
sim_activate (uptr, sched_time); /* else schedule op */
tprintf (msc_dev, DEB_CMDS, "Unit %d command %03o (%s) scheduled, "
"pos = %" T_ADDR_FMT "d, time = %d\n",
msc_usl, uptr->FNC, ms_cmd_name (uptr->FNC),
uptr->pos, sched_time);
}
else
tprintf (msc_dev, DEB_CMDS, "Unit select (NOP)\n");
msc_sta = STA_BUSY; /* ctrl is busy */
msc_1st = 1;
msc.control = SET; /* go */
}
break;
case ioSIR: /* set interrupt request */
setstdPRL (msc); /* set standard PRL signal */
setstdIRQ (msc); /* set standard IRQ signal */
setstdSRQ (msc); /* set standard SRQ signal */
break;
case ioIAK: /* interrupt acknowledge */
msc.flagbuf = CLEAR;
break;
default: /* all other signals */
break; /* are ignored */
}
working_set = working_set & ~signal; /* remove current signal from set */
}
return stat_data;
}
/* Unit service
If rewind done, reposition to start of tape, set status
else, do operation, set done, interrupt.
In addition to decreasing the timing intervals, the FASTTIME option enables
two additional optimizations: WFM for GFM substitution, and BOT gap
elimination. If FASTTIME is selected, gap and file mark (GFM) commands are
processed as WFM (write file mark) commands. That is, the preceding GAP is
not performed. Also, the initial gap that normally precedes the first data
record or EOF mark at the beginning of the tape is omitted. These omissions
result in smaller tape image files. If REALTIME is selected, the gaps are
included. Note that the gaps (and realistic timing) are necessary to pass
the 7970 diagnostics.
*/
t_stat msc_svc (UNIT *uptr)
{
int32 unum;
t_mtrlnt tbc;
t_stat st, r = SCPE_OK;
unum = uptr - msc_unit; /* get unit number */
if ((uptr->FNC != FNC_RWS) && (uptr->flags & UNIT_OFFLINE)) { /* offline? */
msc_sta = (msc_sta | STA_REJ) & ~STA_BUSY; /* reject */
mscio (&msc_dib, ioENF, 0); /* set flag */
return SCPE_OK;
}
switch (uptr->FNC) { /* case on function */
case FNC_RWS: /* rewind offline */
sim_tape_rewind (uptr); /* rewind tape */
uptr->flags = uptr->flags | UNIT_OFFLINE; /* set offline */
uptr->UST = 0; /* clear REW status */
break; /* we're done */
case FNC_REW: /* rewind */
if (uptr->UST & STA_REW) { /* rewind in prog? */
uptr->FNC |= FNC_CMPL; /* set compl state */
sim_activate (uptr, msc_ctime); /* sched completion */
}
break; /* anyway, ctrl done */
case FNC_REW | FNC_CMPL: /* complete rewind */
sim_tape_rewind (uptr); /* rewind tape */
uptr->UST = 0; /* clear REW status */
return SCPE_OK; /* drive is free */
case FNC_GFM: /* gap + file mark */
if (ms_timing == 1) /* fast timing? */
goto DO_WFM; /* do plain file mark */
/* else fall into GAP */
case FNC_GAP: /* erase gap */
tprintf (msc_dev, DEB_RWS, "Unit %d wrote gap\n", unum);
r = ms_write_gap (uptr); /* write tape gap*/
if (r || (uptr->FNC != FNC_GFM)) /* if error or not GFM */
break; /* then bail out now */
/* else drop into WFM */
case FNC_WFM: /* write file mark */
if ((ms_timing == 0) && sim_tape_bot (uptr)) { /* realistic timing + BOT? */
tprintf (msc_dev, DEB_RWS, "Unit %d wrote initial gap\n", unum);
st = ms_write_gap (uptr); /* write initial gap*/
if (st != MTSE_OK) { /* error? */
r = ms_map_err (uptr, st); /* map error */
break; /* terminate operation */
}
}
DO_WFM:
tprintf (msc_dev, DEB_RWS, "Unit %d wrote file mark\n", unum);
st = sim_tape_wrtmk (uptr); /* write tmk */
if (st != MTSE_OK) /* error? */
r = ms_map_err (uptr, st); /* map error */
msc_sta = STA_EOF; /* set EOF status */
break;
case FNC_FSR: /* space forward */
st = sim_tape_sprecf (uptr, &tbc); /* space rec fwd */
if (st != MTSE_OK) /* error? */
r = ms_map_err (uptr, st); /* map error */
if (tbc & 1)
msc_sta = msc_sta | STA_ODD;
else msc_sta = msc_sta & ~STA_ODD;
break;
case FNC_BSR: /* space reverse */
st = sim_tape_sprecr (uptr, &tbc); /* space rec rev*/
if (st != MTSE_OK) /* error? */
r = ms_map_err (uptr, st); /* map error */
if (tbc & 1)
msc_sta = msc_sta | STA_ODD;
else msc_sta = msc_sta & ~STA_ODD;
break;
case FNC_FSF: /* space fwd file */
while ((st = sim_tape_sprecf (uptr, &tbc)) == MTSE_OK) {
if (sim_tape_eot (uptr)) break; /* EOT stops */
}
r = ms_map_err (uptr, st); /* map error */
break;
case FNC_BSF: /* space rev file */
while ((st = sim_tape_sprecr (uptr, &tbc)) == MTSE_OK) ;
r = ms_map_err (uptr, st); /* map error */
break;
case FNC_RFF: /* diagnostic read */
case FNC_RC: /* read */
if (msc_1st) { /* first svc? */
msc_1st = ms_ptr = ms_max = 0; /* clr 1st flop */
st = sim_tape_rdrecf (uptr, msxb, &ms_max, DBSIZE); /* read rec */
tprintf (msc_dev, DEB_RWS, "Unit %d read %d word record\n",
unum, ms_max / 2);
if (st == MTSE_RECE) msc_sta = msc_sta | STA_PAR; /* rec in err? */
else if (st != MTSE_OK) { /* other error? */
r = ms_map_err (uptr, st); /* map error */
if (r == SCPE_OK) { /* recoverable? */
sim_activate (uptr, msc_itime); /* sched IRG */
uptr->FNC |= FNC_CMPL; /* set completion */
return SCPE_OK;
}
break; /* err, done */
}
if (ms_ctype == A13183)
msc_sta = msc_sta | STA_ODD; /* set ODD for 13183 */
}
if (msd.control && (ms_ptr < ms_max)) { /* DCH on, more data? */
if (msd.flag) msc_sta = msc_sta | STA_TIM | STA_PAR;
msd_buf = ((uint16) msxb[ms_ptr] << 8) |
((ms_ptr + 1 == ms_max) ? 0 : msxb[ms_ptr + 1]);
ms_ptr = ms_ptr + 2;
msdio (&msd_dib, ioENF, 0); /* set flag */
sim_activate (uptr, msc_xtime); /* re-activate */
return SCPE_OK;
}
if (ms_max & 1) /* set ODD by rec len */
msc_sta = msc_sta | STA_ODD;
else msc_sta = msc_sta & ~STA_ODD;
sim_activate (uptr, msc_itime); /* sched IRG */
if (uptr->FNC == FNC_RFF) /* diagnostic? */
msc_1st = 1; /* restart */
else {
uptr->FNC |= FNC_CMPL; /* set completion */
ms_crc = TRUE; /* and CRC ready */
}
return SCPE_OK;
case FNC_RFF | FNC_CMPL: /* diagnostic read completion */
case FNC_RC | FNC_CMPL: /* read completion */
break;
case FNC_WC: /* write */
if (msc_1st) { /* first service? */
msc_1st = ms_ptr = 0; /* no data xfer on first svc */
if ((ms_timing == 0) && sim_tape_bot (uptr)) { /* realistic timing + BOT? */
tprintf (msc_dev, DEB_RWS, "Unit %d wrote initial gap\n", unum);
st = ms_write_gap (uptr); /* write initial gap */
if (st != MTSE_OK) { /* error? */
r = ms_map_err (uptr, st); /* map error */
break; /* terminate operation */
}
}
}
else { /* not 1st, next char */
if (ms_ptr < DBSIZE) { /* room in buffer? */
msxb[ms_ptr] = (uint8) (msd_buf >> 8); /* store 2 char */
msxb[ms_ptr + 1] = msd_buf & 0377;
ms_ptr = ms_ptr + 2;
}
else msc_sta = msc_sta | STA_PAR;
}
if (msd.control) { /* xfer flop set? */
msdio (&msd_dib, ioENF, 0); /* set flag */
sim_activate (uptr, msc_xtime); /* re-activate */
return SCPE_OK;
}
if (ms_ptr) { /* any data? write */
tprintf (msc_dev, DEB_RWS, "Unit %d wrote %d word record\n",
unum, ms_ptr / 2);
st = sim_tape_wrrecf (uptr, msxb, ms_ptr); /* write */
if (st != MTSE_OK) {
r = ms_map_err (uptr, st); /* map error */
break;
}
}
sim_activate (uptr, msc_itime); /* sched IRG */
uptr->FNC |= FNC_CMPL; /* set completion */
ms_max = ms_ptr; /* indicate buffer complete */
ms_crc = TRUE; /* and CRC may be generated */
return SCPE_OK;
case FNC_WC | FNC_CMPL: /* write completion */
break;
case FNC_RRR: /* not supported */
default: /* unknown command */
tprintf (msc_dev, DEB_CMDS, "Unit %d command %03o is unknown (NOP)\n",
unum, uptr->FNC);
break;
}
mscio (&msc_dib, ioENF, 0); /* set flag */
msc_sta = msc_sta & ~STA_BUSY; /* update status */
tprintf (msc_dev, DEB_CMDS, "Unit %d command %03o (%s) complete\n",
unum, uptr->FNC & 0377, ms_cmd_name (uptr->FNC));
return r;
}
/* Write an erase gap */
t_stat ms_write_gap (UNIT *uptr)
{
t_stat st;
uint32 gap_len = ms_ctype ? GAP_13183 : GAP_13181; /* establish gap length */
st = sim_tape_wrgap (uptr, gap_len); /* write gap */
if (st != MTSE_OK)
return ms_map_err (uptr, st); /* map error if failure */
else
return SCPE_OK;
}
/* Map tape error status */
t_stat ms_map_err (UNIT *uptr, t_stat st)
{
int32 unum = uptr - msc_unit; /* get unit number */
tprintf (msc_dev, DEB_RWS, "Unit %d tape library status = %d\n", unum, st);
switch (st) {
case MTSE_FMT: /* illegal fmt */
msc_sta = msc_sta | STA_REJ; /* reject cmd */
return SCPE_FMT; /* format error */
case MTSE_UNATT: /* unattached */
msc_detach (uptr); /* resync status (ignore rtn) */
msc_sta = msc_sta | STA_REJ; /* reject cmd */
return SCPE_UNATT; /* unit unattached */
case MTSE_OK: /* no error */
return SCPE_IERR; /* never get here! */
case MTSE_EOM: /* end of medium */
case MTSE_TMK: /* end of file */
msc_sta = msc_sta | STA_EOF;
if (ms_ctype == A13181)
msc_sta = msc_sta | STA_ODD; /* EOF also sets ODD for 13181B */
break;
case MTSE_INVRL: /* invalid rec lnt */
msc_sta = msc_sta | STA_PAR;
return SCPE_MTRLNT;
case MTSE_IOERR: /* IO error */
msc_sta = msc_sta | STA_PAR; /* error */
return SCPE_IOERR;
case MTSE_RECE: /* record in error */
msc_sta = msc_sta | STA_PAR; /* error */
break;
case MTSE_WRP: /* write protect */
msc_sta = msc_sta | STA_REJ; /* reject */
break;
}
return SCPE_OK;
}
/* Controller clear */
t_stat ms_clear (void)
{
int32 i;
t_stat st;
UNIT *uptr;
for (i = 0; i < MS_NUMDR; i++) { /* look for write in progr */
uptr = &msc_unit [i]; /* get pointer to unit */
if (sim_is_active (uptr) && /* unit active? */
(uptr->FNC == FNC_WC) && /* and last cmd write? */
(ms_ptr > 0)) { /* and partial buffer? */
tprintf (msc_dev, DEB_RWS, "Unit %d wrote %d word partial record\n", i, ms_ptr / 2);
st = sim_tape_wrrecf (uptr, msxb, ms_ptr | MTR_ERF);
if (st != MTSE_OK)
ms_map_err (uptr, st); /* discard any error */
ms_ptr = 0; /* clear partial */
}
if ((uptr->UST & STA_REW) == 0)
sim_cancel (uptr); /* stop if not rew */
}
msc_sta = msc_1st = 0; /* clr ctlr status */
return SCPE_OK;
}
/* Reset routine */
t_stat msc_reset (DEVICE *dptr)
{
int32 i;
UNIT *uptr;
DIB *dibptr = (DIB *) dptr->ctxt; /* DIB pointer */
hp_enbdis_pair (dptr, /* make pair cons */
(dptr == &msd_dev) ? &msc_dev : &msd_dev);
if (sim_switches & SWMASK ('P')) /* initialization reset? */
ms_config_timing ();
IOPRESET (dibptr); /* PRESET device (does not use PON) */
msc_buf = msd_buf = 0;
msc_sta = msc_usl = 0;
msc_1st = 0;
for (i = 0; i < MS_NUMDR; i++) {
uptr = msc_dev.units + i;
sim_tape_reset (uptr);
sim_cancel (uptr);
uptr->UST = 0;
if (sim_switches & SWMASK ('P')) /* if this is an initialization reset */
sim_tape_set_dens (uptr, /* then tell the tape library the density in use */
ms_ctype ? BPI_13183 : BPI_13181,
NULL, NULL);
}
return SCPE_OK;
}
/* Attach routine */
t_stat msc_attach (UNIT *uptr, CONST char *cptr)
{
t_stat r;
r = sim_tape_attach (uptr, cptr); /* attach unit */
if (r == SCPE_OK)
uptr->flags = uptr->flags & ~UNIT_OFFLINE; /* set online */
return r;
}
/* Detach routine */
t_stat msc_detach (UNIT* uptr)
{
uptr->UST = 0; /* clear status */
uptr->flags = uptr->flags | UNIT_OFFLINE; /* set offline */
return sim_tape_detach (uptr); /* detach unit */
}
/* Online routine */
t_stat msc_online (UNIT *uptr, int32 value, CONST char *cptr, void *desc)
{
if (uptr->flags & UNIT_ATT) return SCPE_OK;
else return SCPE_UNATT;
}
/* Configure timing */
void ms_config_timing (void)
{
uint32 i, tset;
tset = (ms_timing << 1) | (ms_timing ? 0 : ms_ctype); /* select timing set */
for (i = 0; i < (sizeof (timers) / sizeof (timers[0])); i++)
*timers[i] = msc_times[tset][i]; /* assign times */
}
/* Set controller timing */
t_stat ms_set_timing (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
{
if ((val < 0) || (val > 1) || (cptr != NULL)) return SCPE_ARG;
ms_timing = val;
ms_config_timing ();
return SCPE_OK;
}
/* Show controller timing */
t_stat ms_show_timing (FILE *st, UNIT *uptr, int32 val, CONST void *desc)
{
if (ms_timing) fputs ("fast timing", st);
else fputs ("realistic timing", st);
return SCPE_OK;
}
/* Set controller type */
t_stat ms_settype (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
{
int32 i;
if ((val < 0) || (val > 1) || (cptr != NULL)) return SCPE_ARG;
for (i = 0; i < MS_NUMDR; i++) {
if (msc_unit[i].flags & UNIT_ATT) return SCPE_ALATT;
}
ms_ctype = (CNTLR_TYPE) val;
ms_config_timing (); /* update for new type */
sim_tape_set_dens (uptr, ms_ctype ? BPI_13183 : BPI_13181, /* tell the tape library the density in use */
NULL, NULL);
return SCPE_OK;
}
/* Show controller type */
t_stat ms_showtype (FILE *st, UNIT *uptr, int32 val, CONST void *desc)
{
if (ms_ctype == A13183)
fprintf (st, "13183B");
else
fprintf (st, "13181B");
return SCPE_OK;
}
/* Set unit reel size
val = 0 -> SET MSCn CAPACITY=n
val = 1 -> SET MSCn REEL=n */
t_stat ms_set_reelsize (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
{
int32 reel;
t_stat status;
if (val == 0) {
status = sim_tape_set_capac (uptr, val, cptr, desc);
if (status == SCPE_OK) uptr->REEL = 0;
return status;
}
if (cptr == NULL) return SCPE_ARG;
reel = (int32) get_uint (cptr, 10, 2400, &status);
if (status != SCPE_OK) return status;
else switch (reel) {
case 0:
uptr->REEL = 0; /* type 0 = unlimited/custom */
break;
case 600:
uptr->REEL = 1; /* type 1 = 600 foot */
break;
case 1200:
uptr->REEL = 2; /* type 2 = 1200 foot */
break;
case 2400:
uptr->REEL = 3; /* type 3 = 2400 foot */
break;
default:
return SCPE_ARG;
}
uptr->capac = uptr->REEL ? (TCAP << uptr->REEL) << ms_ctype : 0;
return SCPE_OK;
}
/* Show unit reel size
val = 0 -> SHOW MSC or SHOW MSCn or SHOW MSCn CAPACITY
val = 1 -> SHOW MSCn REEL */
t_stat ms_show_reelsize (FILE *st, UNIT *uptr, int32 val, CONST void *desc)
{
t_stat status = SCPE_OK;
if (uptr->REEL == 0) status = sim_tape_show_capac (st, uptr, val, desc);
else fprintf (st, "%4d foot reel", 300 << uptr->REEL);
if (val == 1) fputc ('\n', st); /* MTAB_NMO omits \n */
return status;
}
/* Translate command to mnemonic for debug logging
The command names and descriptions are taken from the 13181 interface
manual. */
char *ms_cmd_name (uint32 cmd)
{
switch (cmd & 0377) {
case FNC_WC: return "WCC"; /* Write command */
case FNC_WFM: return "WFM"; /* Write file mark */
case FNC_RC: return "RRF"; /* Read record forward */
case FNC_FSR: return "FSR"; /* Forward space record */
case FNC_FSF: return "FSF"; /* Forward space file */
case FNC_GAP: return "GAP"; /* Write gap */
case FNC_BSR: return "BSR"; /* Backspace record */
case FNC_BSF: return "BSF"; /* Backspace file */
case FNC_REW: return "REW"; /* Rewind */
case FNC_RWS: return "RWO"; /* Rewind off-line */
case FNC_CLR: return "CLR"; /* Clear controller */
case FNC_GFM: return "GFM"; /* Gap file mark */
case FNC_RFF: return "RFF"; /* Read forward until file mark (diag) */
case FNC_RRR: return "RRR"; /* Read record in reverse (diag) */
default: return "???"; /* Unknown command */
}
}
/* 7970B/7970E bootstrap routine (HP 12992D ROM) */
const BOOT_ROM ms_rom = {
0106501, /*ST LIB 1 ; read sw */
0006011, /* SLB,RSS ; bit 0 set? */
0027714, /* JMP RD ; no read */
0003004, /* CMA,INA ; A is ctr */
0073775, /* STA WC ; save */
0067772, /* LDA SL0RW ; sel 0, rew */
0017762, /*FF JSB CMD ; do cmd */
0102311, /* SFS CC ; done? */
0027707, /* JMP *-1 ; wait */
0067774, /* LDB FFC ; get file fwd */
0037775, /* ISZ WC ; done files? */
0027706, /* JMP FF ; no */
0067773, /*RD LDB RDCMD ; read cmd */
0017762, /* JSB CMD ; do cmd */
0103710, /* STC DC,C ; start dch */
0102211, /* SFC CC ; read done? */
0027752, /* JMP STAT ; no, get stat */
0102310, /* SFS DC ; any data? */
0027717, /* JMP *-3 ; wait */
0107510, /* LIB DC,C ; get rec cnt */
0005727, /* BLF,BLF ; move to lower */
0007000, /* CMB ; make neg */
0077775, /* STA WC ; save */
0102211, /* SFC CC ; read done? */
0027752, /* JMP STAT ; no, get stat */
0102310, /* SFS DC ; any data? */
0027727, /* JMP *-3 ; wait */
0107510, /* LIB DC,C ; get load addr */
0074000, /* STB 0 ; start csum */
0077762, /* STA CMD ; save address */
0027742, /* JMP *+4 */
0177762, /*NW STB CMD,I ; store data */
0040001, /* ADA 1 ; add to csum */
0037762, /* ISZ CMD ; adv addr ptr */
0102310, /* SFS DC ; any data? */
0027742, /* JMP *-1 ; wait */
0107510, /* LIB DC,C ; get word */
0037775, /* ISZ WC ; done? */
0027737, /* JMP NW ; no */
0054000, /* CPB 0 ; csum ok? */
0027717, /* JMP RD+3 ; yes, cont */
0102011, /* HLT 11 ; no, halt */
0102511, /*ST LIA CC ; get status */
0001727, /* ALF,ALF ; get eof bit */
0002020, /* SSA ; set? */
0102077, /* HLT 77 ; done */
0001727, /* ALF,ALF ; put status back */
0001310, /* RAR,SLA ; read ok? */
0102000, /* HLT 0 ; no */
0027714, /* JMP RD ; read next */
0000000, /*CMD 0 */
0106611, /* OTB CC ; output cmd */
0102511, /* LIA CC ; check for reject */
0001323, /* RAR,RAR */
0001310, /* RAR,SLA */
0027763, /* JMP CMD+1 ; try again */
0103711, /* STC CC,C ; start command */
0127762, /* JMP CMD,I ; exit */
0001501, /*SL0RW 001501 ; select 0, rewind */
0001423, /*RDCMD 001423 ; read record */
0000203, /*FFC 000203 ; space forward file */
0000000, /*WC 000000 */
0000000,
0000000
};
t_stat msc_boot (int32 unitno, DEVICE *dptr)
{
const int32 dev = msd_dib.select_code; /* get data chan device no */
if (unitno != 0) /* boot supported on drive unit 0 only */
return SCPE_NOFNC; /* report "Command not allowed" if attempted */
cpu_ibl (ms_rom, dev, IBL_OPT, /* copy the boot ROM to memory and configure */
IBL_MS | IBL_SET_SC (dev)); /* the S register accordingly */
if ((sim_switches & SWMASK ('S')) && AR) /* if -S is specified and the A register is non-zero */
SR = SR | 1; /* then set to skip to the file number in A */
return SCPE_OK;
}
/* Calculate tape record CRC and LRC characters */
static uint32 calc_crc_lrc (uint8 *buffer, t_mtrlnt length)
{
uint32 i;
HP_WORD byte, crc, lrc;
lrc = crc = 0;
for (i = 0; i < length; i++) {
byte = odd_parity [buffer [i]] | buffer [i];
crc = crc ^ byte;
lrc = lrc ^ byte;
if (crc & 1)
crc = crc >> 1 ^ 0474;
else
crc = crc >> 1;
}
crc = crc ^ 0727;
lrc = lrc ^ crc;
return (uint32) crc << 16 | lrc;
}