df6475181c
1. New Features 1.1 GRI-909 - This is a new simulator for the GRI-909. - It has been hand-tested; so far, no software has been discovered. 1.2 VAX - SET CPU CONHALT will cause a HALT instruction to return to the boot ROM console rather than to SIMH. SET CPU SIMHALT restores the default behavior. - BRB/W self at IPL 1F stops the simulator. This is the default behavior of VMS at exit. 1.3 PDP-18b - ATTACH -A PTR/PTP attaches the reader and punch in ASCII mode. In ASCII mode, the reader automatically sets the high order bit of incoming alphabetic data, and the punch clears the high order bit of outgoing data. 1.4 SCP - DO -V echoes commands from the file as they are executed. - Under Windows, execution priority is set BELOW_NORMAL when the simulator is running. 2. Release Notes 2.1 Bugs Fixed - PDP-11 CPU: fixed updating of MMR0 on a memory management error. - VAX FPA: changed function names to avoid conflict with C math library. - 1401 MT: read end of record generates group mark without word mark. - 1401 DP: fixed address generation and checking. - SCP: an EXIT within a DO command will cause the simulator to exit. 3. In Progress - Interdata 16b/32b: coded, not tested. - SDS 940: coded, not tested. - IBM 1620: coded, not tested. If you would like to help with the debugging of the untested simulators, they can be made available by special request.
311 lines
10 KiB
C
311 lines
10 KiB
C
/* i1401_mt.c: IBM 1401 magnetic tape simulator
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Copyright (c) 1993-2002, Robert M. Supnik
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of Robert M Supnik shall not
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be used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from Robert M Supnik.
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mt 7-track magtape
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12-Jun-02 RMS End-of-record on read sets GM without WM
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(found by Van Snyder)
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03-Jun-02 RMS Modified for 1311 support
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30-May-02 RMS Widened POS to 32b
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22-Apr-02 RMS Added protection against bad record lengths
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30-Jan-02 RMS New zero footprint tape bootstrap from Van Snyder
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20-Jan-02 RMS Changed write enabled modifier
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29-Nov-01 RMS Added read only unit support
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18-Apr-01 RMS Changed to rewind tape before boot
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07-Dec-00 RMS Widened display width from 6 to 8 bits to see record lnt
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CEO Added tape bootstrap
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14-Apr-99 RMS Changed t_addr to unsigned
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04-Oct-98 RMS V2.4 magtape format
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Magnetic tapes are represented as a series of variable 16b records
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of the form:
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32b byte count
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byte 0
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byte 1
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:
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byte n-2
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byte n-1
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32b byte count
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If the byte count is odd, the record is padded with an extra byte
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of junk. File marks are represented by a byte count of 0.
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*/
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#include "i1401_defs.h"
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#define MT_NUMDR 7 /* #drives */
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#define UNIT_V_WLK (UNIT_V_UF + 0) /* write locked */
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#define UNIT_WLK (1 << UNIT_V_WLK)
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#define UNIT_W_UF 2 /* #save flags */
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#define UNIT_WPRT (UNIT_WLK | UNIT_RO) /* write protect */
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#define MT_MAXFR (MAXMEMSIZE * 2) /* max transfer */
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extern uint8 M[]; /* memory */
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extern int32 ind[64];
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extern int32 BS, iochk;
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extern UNIT cpu_unit;
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uint8 dbuf[MT_MAXFR]; /* tape buffer */
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t_stat mt_reset (DEVICE *dptr);
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t_stat mt_boot (int32 unitno);
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UNIT *get_unit (int32 unit);
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/* MT data structures
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mt_dev MT device descriptor
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mt_unit MT unit list
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mt_reg MT register list
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mt_mod MT modifier list
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*/
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UNIT mt_unit[] = {
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{ UDATA (NULL, UNIT_DIS, 0) }, /* doesn't exist */
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{ UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +
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UNIT_ROABLE + UNIT_BCD, 0) },
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{ UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +
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UNIT_ROABLE + UNIT_BCD, 0) },
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{ UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +
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UNIT_ROABLE + UNIT_BCD, 0) },
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{ UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +
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UNIT_ROABLE + UNIT_BCD, 0) },
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{ UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +
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UNIT_ROABLE + UNIT_BCD, 0) },
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{ UDATA (NULL, UNIT_DISABLE + UNIT_ATTABLE +
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UNIT_ROABLE + UNIT_BCD, 0) } };
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REG mt_reg[] = {
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{ FLDATA (END, ind[IN_END], 0) },
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{ FLDATA (ERR, ind[IN_TAP], 0) },
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{ DRDATA (POS1, mt_unit[1].pos, 32), PV_LEFT + REG_RO },
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{ DRDATA (POS2, mt_unit[2].pos, 32), PV_LEFT + REG_RO },
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{ DRDATA (POS3, mt_unit[3].pos, 32), PV_LEFT + REG_RO },
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{ DRDATA (POS4, mt_unit[4].pos, 32), PV_LEFT + REG_RO },
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{ DRDATA (POS5, mt_unit[5].pos, 32), PV_LEFT + REG_RO },
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{ DRDATA (POS6, mt_unit[6].pos, 32), PV_LEFT + REG_RO },
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{ GRDATA (FLG1, mt_unit[1].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
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REG_HRO },
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{ GRDATA (FLG2, mt_unit[2].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
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REG_HRO },
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{ GRDATA (FLG3, mt_unit[3].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
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REG_HRO },
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{ GRDATA (FLG4, mt_unit[4].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
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REG_HRO },
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{ GRDATA (FLG5, mt_unit[5].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
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REG_HRO },
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{ GRDATA (FLG6, mt_unit[6].flags, 8, UNIT_W_UF, UNIT_V_UF - 1),
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REG_HRO },
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{ NULL } };
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MTAB mt_mod[] = {
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{ UNIT_WLK, 0, "write enabled", "WRITEENABLED", NULL },
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{ UNIT_WLK, UNIT_WLK, "write locked", "LOCKED", NULL },
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{ 0 } };
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DEVICE mt_dev = {
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"MT", mt_unit, mt_reg, mt_mod,
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MT_NUMDR, 10, 31, 1, 8, 8,
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NULL, NULL, &mt_reset,
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&mt_boot, NULL, NULL };
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/* Function routine
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Inputs:
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unit = unit character
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mod = modifier character
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Outputs:
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status = status
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*/
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t_stat mt_func (int32 unit, int32 mod)
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{
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int32 err;
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t_mtrlnt tbc;
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UNIT *uptr;
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static t_mtrlnt bceof = { 0 };
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if ((uptr = get_unit (unit)) == NULL) return STOP_INVMTU; /* valid unit? */
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if ((uptr -> flags & UNIT_ATT) == 0) return SCPE_UNATT; /* attached? */
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switch (mod) { /* case on modifier */
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case BCD_B: /* backspace */
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ind[IN_END] = 0; /* clear end of reel */
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if (uptr -> pos == 0) return SCPE_OK; /* at bot? */
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fseek (uptr -> fileref, uptr -> pos - sizeof (t_mtrlnt),
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SEEK_SET);
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fxread (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
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if ((err = ferror (uptr -> fileref)) ||
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(feof (uptr -> fileref))) break;
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if (tbc == 0) /* file mark? */
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uptr -> pos = uptr -> pos - sizeof (t_mtrlnt);
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else uptr -> pos = uptr -> pos - ((MTRL (tbc) + 1) & ~1) -
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(2 * sizeof (t_mtrlnt));
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break; /* end case */
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case BCD_E: /* erase = nop */
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if (uptr -> flags & UNIT_WPRT) return STOP_MTL;
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return SCPE_OK;
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case BCD_M: /* write tapemark */
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if (uptr -> flags & UNIT_WPRT) return STOP_MTL;
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fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
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fxwrite (&bceof, sizeof (t_mtrlnt), 1, uptr -> fileref);
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err = ferror (uptr -> fileref);
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uptr -> pos = uptr -> pos + sizeof (t_mtrlnt);
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break;
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case BCD_R: /* rewind */
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uptr -> pos = 0; /* update position */
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return SCPE_OK;
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case BCD_U: /* unload */
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uptr -> pos = 0; /* update position */
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return detach_unit (uptr); /* detach */
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default:
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return STOP_INVM; }
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if (err != 0) { /* I/O error */
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perror ("MT I/O error");
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clearerr (uptr -> fileref);
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if (iochk) return SCPE_IOERR;
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ind[IN_TAP] = 1; }
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return SCPE_OK;
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}
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/* Read and write routines
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Inputs:
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unit = unit character
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flag = normal, word mark, or binary mode
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mod = modifier character
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Outputs:
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status = status
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*/
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t_stat mt_io (int32 unit, int32 flag, int32 mod)
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{
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int32 err, i, t, wm_seen;
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t_mtrlnt tbc;
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UNIT *uptr;
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if ((uptr = get_unit (unit)) == NULL) return STOP_INVMTU; /* valid unit? */
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if ((uptr -> flags & UNIT_ATT) == 0) return SCPE_UNATT; /* attached? */
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switch (mod) {
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case BCD_R: /* read */
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ind[IN_TAP] = ind[IN_END] = 0; /* clear error */
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wm_seen = 0; /* no word mk seen */
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fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
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fxread (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
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if ((err = ferror (uptr -> fileref)) || (feof (uptr -> fileref))) {
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ind[IN_END] = 1; /* err or eof? */
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break; }
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if (tbc == 0) { /* tape mark? */
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ind[IN_END] = 1; /* set end mark */
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uptr -> pos = uptr -> pos + sizeof (t_mtrlnt);
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break; }
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tbc = MTRL (tbc); /* ignore error flag */
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if (tbc > MT_MAXFR) return SCPE_MTRLNT; /* record too long? */
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i = fxread (dbuf, sizeof (int8), tbc, uptr -> fileref);
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for ( ; i < tbc; i++) dbuf[i] = 0; /* fill with 0's */
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if (err = ferror (uptr -> fileref)) break; /* I/O error? */
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uptr -> pos = uptr -> pos + ((tbc + 1) & ~1) +
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(2 * sizeof (t_mtrlnt));
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for (i = 0; i < tbc; i++) { /* loop thru buf */
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if (M[BS] == (BCD_GRPMRK + WM)) { /* GWM in memory? */
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BS++; /* incr BS */
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if (ADDR_ERR (BS)) { /* test for wrap */
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BS = BA | (BS % MAXMEMSIZE);
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return STOP_WRAP; }
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return SCPE_OK; } /* done */
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t = dbuf[i]; /* get char */
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if ((flag != MD_BIN) && (t == BCD_ALT)) t = BCD_BLANK;
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if (flag == MD_WM) { /* word mk mode? */
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if ((t == BCD_WM) && (wm_seen == 0)) wm_seen = WM;
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else { M[BS] = wm_seen | (t & CHAR);
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wm_seen = 0; } }
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else M[BS] = (M[BS] & WM) | (t & CHAR);
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if (!wm_seen) BS++;
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if (ADDR_ERR (BS)) { /* check next BS */
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BS = BA | (BS % MAXMEMSIZE);
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return STOP_WRAP; } }
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if (flag == MD_WM) M[BS] = BCD_GRPMRK; /* load? clear WM */
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else M[BS] = (M[BS] & WM) | BCD_GRPMRK; /* move? save WM */
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break;
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case BCD_W:
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if (uptr -> flags & UNIT_WPRT) return STOP_MTL; /* locked? */
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if (M[BS] == (BCD_GRPMRK + WM)) return STOP_MTZ; /* eor? */
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ind[IN_TAP] = ind[IN_END] = 0; /* clear error */
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for (tbc = 0; (t = M[BS++]) != (BCD_GRPMRK + WM); ) {
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if ((t & WM) && (flag == MD_WM)) dbuf[tbc++] = BCD_WM;
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if (((t & CHAR) == BCD_BLANK) && (flag != MD_BIN))
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dbuf[tbc++] = BCD_ALT;
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else dbuf[tbc++] = t & CHAR;
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if (ADDR_ERR (BS)) { /* check next BS */
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BS = BA | (BS % MAXMEMSIZE);
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return STOP_WRAP; } }
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fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
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fxwrite (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
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fxwrite (dbuf, sizeof (int8), (tbc + 1) & ~1, uptr -> fileref);
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fxwrite (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
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if (err = ferror (uptr -> fileref)) break; /* I/O error? */
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uptr -> pos = uptr -> pos + ((tbc + 1) & ~1) +
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(2 * sizeof (t_mtrlnt));
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if (ADDR_ERR (BS)) { /* check final BS */
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BS = BA | (BS % MAXMEMSIZE);
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return STOP_WRAP; }
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break;
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default:
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return STOP_INVM; }
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if (err != 0) { /* I/O error */
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perror ("MT I/O error");
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clearerr (uptr -> fileref);
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ind[IN_TAP] = 1; /* flag error */
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if (iochk) return SCPE_IOERR; }
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return SCPE_OK;
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}
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/* Get unit pointer from unit number */
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UNIT *get_unit (int32 unit)
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{
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if ((unit <= 0) || (unit >= MT_NUMDR)) return NULL;
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else return mt_dev.units + unit;
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}
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/* Reset routine */
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t_stat mt_reset (DEVICE *dptr)
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{
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ind[IN_END] = ind[IN_TAP] = 0; /* clear indicators */
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return SCPE_OK;
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}
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/* Bootstrap routine */
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t_stat mt_boot (int32 unitno)
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{
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extern int32 saved_IS;
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mt_unit[unitno].pos = 0; /* force rewind */
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BS = 1; /* set BS = 001 */
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mt_io (unitno, MD_WM, BCD_R); /* LDA %U1 001 R */
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saved_IS = 1;
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return SCPE_OK;
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}
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