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.
455 lines
15 KiB
C
455 lines
15 KiB
C
/* pdp18b_mt.c: 18b PDP 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 (PDP-9) TC59 magtape
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(PDP-15) TC59D magtape
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30-May-02 RMS Widened POS to 32b
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22-Apr-02 RMS Added maximum record length test
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06-Jan-02 RMS Revised enabled/disable support
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29-Nov-01 RMS Added read only unit support
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25-Nov-01 RMS Revised interrupt structure
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Changed UST, POS, FLG to arrays
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26-Apr-01 RMS Added device enable/disable support
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15-Feb-01 RMS Fixed 3-cycle data break sequence
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04-Oct-98 RMS V2.4 magtape format
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22-Jan-97 RMS V2.3 magtape format
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29-Jun-96 RMS Added unit enable/disable support
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Magnetic tapes are represented as a series of variable 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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32 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 "pdp18b_defs.h"
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#define MT_NUMDR 8 /* #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 /* saved flag width */
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#define USTAT u3 /* unit status */
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#define UNUM u4 /* unit number */
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#define MT_MAXFR (1 << 16) /* max record length */
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#define DBSIZE (1 << 12) /* max word count */
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#define DBMASK (DBSIZE - 1)
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#define MT_WC 032 /* word count */
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#define MT_CA 033 /* current addr */
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#define UNIT_WPRT (UNIT_WLK | UNIT_RO) /* write protect */
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/* Command/unit - mt_cu */
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#define CU_V_UNIT 15 /* unit */
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#define CU_M_UNIT 07
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#define CU_PARITY 0040000 /* parity select */
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#define CU_DUMP 0020000 /* dump mode */
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#define CU_ERASE 0010000 /* ext rec gap */
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#define CU_V_CMD 9 /* command */
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#define CU_M_CMD 07
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#define FN_NOP 00
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#define FN_REWIND 01
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#define FN_READ 02
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#define FN_CMPARE 03
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#define FN_WRITE 04
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#define FN_WREOF 05
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#define FN_SPACEF 06
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#define FN_SPACER 07
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#define CU_IE 0000400 /* interrupt enable */
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#define CU_V_TYPE 6 /* drive type */
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#define CU_M_TYPE 03
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#define TY_9TK 3
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#define GET_UNIT(x) (((x) >> CU_V_UNIT) & CU_M_UNIT)
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#define GET_CMD(x) (((x) >> CU_V_CMD) & CU_M_CMD)
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#define GET_TYPE(x) (((x) >> CU_V_TYPE) & CU_M_TYPE)
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#define PACKED(x) (((x) & CU_DUMP) || (GET_TYPE (x) != TY_9TK))
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/* Status - stored in mt_sta or (*) uptr -> USTAT */
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#define STA_ERR 0400000 /* error */
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#define STA_REW 0200000 /* *rewinding */
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#define STA_BOT 0100000 /* *start of tape */
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#define STA_ILL 0040000 /* illegal cmd */
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#define STA_PAR 0020000 /* parity error */
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#define STA_EOF 0010000 /* *end of file */
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#define STA_EOT 0004000 /* *end of tape */
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#define STA_CPE 0002000 /* compare error */
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#define STA_RLE 0001000 /* rec lnt error */
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#define STA_DLT 0000400 /* data late */
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#define STA_BAD 0000200 /* bad tape */
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#define STA_DON 0000100 /* done */
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#define STA_CLR 0000077 /* always clear */
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#define STA_DYN (STA_REW | STA_BOT | STA_EOF | STA_EOT)
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/* kept in USTAT */
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#define STA_EFLGS (STA_BOT | STA_ILL | STA_PAR | STA_EOF | \
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STA_EOT | STA_CPE | STA_RLE | STA_DLT | STA_BAD)
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/* error flags */
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extern int32 M[];
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extern int32 int_hwre[API_HLVL+1], dev_enb;
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extern UNIT cpu_unit;
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int32 mt_cu = 0; /* command/unit */
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int32 mt_sta = 0; /* status register */
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int32 mt_time = 10; /* record latency */
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int32 mt_stopioe = 1; /* stop on error */
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t_stat mt_svc (UNIT *uptr);
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t_stat mt_reset (DEVICE *dptr);
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t_stat mt_attach (UNIT *uptr, char *cptr);
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t_stat mt_detach (UNIT *uptr);
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int32 mt_updcsta (UNIT *uptr, int32 val);
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UNIT *mt_busy (void);
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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 (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
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{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
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{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
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{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
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{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
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{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
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{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
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{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) } };
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REG mt_reg[] = {
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{ ORDATA (STA, mt_sta, 18) },
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{ ORDATA (CMD, mt_cu, 18) },
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{ ORDATA (WC, M[MT_WC], 18) },
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{ ORDATA (CA, M[MT_CA], 18) },
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{ FLDATA (INT, int_hwre[API_MTA], INT_V_MTA) },
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{ FLDATA (STOP_IOE, mt_stopioe, 0) },
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{ DRDATA (TIME, mt_time, 24), PV_LEFT },
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{ URDATA (UST, mt_unit[0].USTAT, 8, 16, 0, MT_NUMDR, 0) },
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{ URDATA (POS, mt_unit[0].pos, 10, 32, 0,
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MT_NUMDR, PV_LEFT | REG_RO) },
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{ URDATA (FLG, mt_unit[0].flags, 8, UNIT_W_UF, UNIT_V_UF - 1,
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MT_NUMDR, REG_HRO) },
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{ FLDATA (*DEVENB, dev_enb, ENB_V_MTA), 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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{ MTAB_XTD|MTAB_VDV, ENB_MTA, NULL, "ENABLED", &set_enb },
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{ MTAB_XTD|MTAB_VDV, ENB_MTA, NULL, "DISABLED", &set_dsb },
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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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NULL, &mt_attach, &mt_detach };
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/* IOT routine */
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int32 mt (int32 pulse, int32 AC)
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{
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int32 f;
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UNIT *uptr;
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uptr = mt_dev.units + GET_UNIT (mt_cu); /* get unit */
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mt_updcsta (uptr, 0); /* update status */
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if (pulse == 001) /* MTTR */
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return (!sim_is_active (uptr))? IOT_SKP + AC: AC;
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if (pulse == 021) /* MTCR */
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return (!mt_busy ())? IOT_SKP + AC: AC;
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if (pulse == 041) /* MTSF */
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return (mt_sta & (STA_ERR | STA_DON))? IOT_SKP + AC: AC;
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if (pulse == 002) return (mt_cu & 0777700); /* MTRC */
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if (pulse == 042) return mt_sta; /* MTRS */
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if ((pulse & 062) == 022) { /* MTAF, MTLC */
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if (!mt_busy ()) mt_cu = mt_sta = 0; /* if not busy, clr */
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mt_sta = mt_sta & ~(STA_ERR | STA_DON); } /* clear flags */
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if ((pulse & 064) == 024) /* MTCM, MTLC */
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mt_cu = (mt_cu & 0770700) | (AC & 0777700); /* load status */
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if (pulse == 004) { /* MTGO */
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f = GET_CMD (mt_cu); /* get function */
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if (mt_busy () || (sim_is_active (uptr)) ||
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(((f == FN_SPACER) || (f == FN_REWIND)) & (uptr -> pos == 0)) ||
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(((f == FN_WRITE) || (f == FN_WREOF)) && (uptr -> flags & UNIT_WPRT))
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|| ((uptr -> flags & UNIT_ATT) == 0) || (f == FN_NOP))
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mt_sta = mt_sta | STA_ILL; /* illegal op flag */
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else { if (f == FN_REWIND) uptr -> USTAT = STA_REW; /* rewind? */
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else mt_sta = uptr -> USTAT = 0; /* no, clear status */
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sim_activate (uptr, mt_time); } } /* start io */
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mt_updcsta (mt_dev.units + GET_UNIT (mt_cu), 0); /* update status */
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return AC;
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}
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/* Unit service
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If rewind done, reposition to start of tape, set status
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else, do operation, set done, interrupt
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*/
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t_stat mt_svc (UNIT *uptr)
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{
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int32 c, c1, c2, c3, f, i, p, u, err;
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int32 wc, xma;
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t_stat rval;
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t_mtrlnt tbc, cbc;
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static uint8 dbuf[(3 * DBSIZE)];
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static t_mtrlnt bceof = { 0 };
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u = uptr -> UNUM; /* get unit number */
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if (uptr -> USTAT & STA_REW) { /* rewind? */
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uptr -> pos = 0; /* update position */
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if (uptr -> flags & UNIT_ATT) uptr -> USTAT = STA_BOT;
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else uptr -> USTAT = 0;
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if (u == GET_UNIT (mt_cu)) mt_updcsta (uptr, STA_DON);
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return SCPE_OK; }
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f = GET_CMD (mt_cu); /* get command */
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if ((uptr -> flags & UNIT_ATT) == 0) { /* if not attached */
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mt_updcsta (uptr, STA_ILL); /* illegal operation */
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return IORETURN (mt_stopioe, SCPE_UNATT); }
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if ((f == FN_WRITE) || (f == FN_WREOF)) { /* write? */
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if (uptr -> flags & UNIT_WPRT) { /* write locked? */
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mt_updcsta (uptr, STA_ILL); /* illegal operation */
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return SCPE_OK; }
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mt_cu = mt_cu & ~CU_ERASE; } /* clear erase flag */
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err = 0;
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rval = SCPE_OK;
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switch (f) { /* case on function */
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/* Unit service, continued */
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case FN_READ: /* read */
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case FN_CMPARE: /* read/compare */
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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)) || /* error or eof? */
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(feof (uptr -> fileref))) {
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uptr -> USTAT = STA_EOT;
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mt_updcsta (uptr, STA_RLE);
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break; }
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if (tbc == 0) { /* tape mark? */
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uptr -> USTAT = STA_EOF;
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mt_updcsta (uptr, STA_RLE);
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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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wc = DBSIZE - (M[MT_WC] & DBMASK); /* get word count */
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cbc = PACKED (mt_cu)? wc * 3: wc * 2; /* expected bc */
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if (tbc != cbc) mt_sta = mt_sta | STA_RLE; /* wrong size? */
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if (tbc < cbc) { /* record small? */
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cbc = tbc; /* use smaller */
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wc = PACKED (mt_cu)? ((tbc + 2) / 3): ((tbc + 1) / 2); }
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i = fxread (dbuf, sizeof (int8), cbc, uptr -> fileref);
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for ( ; i < cbc; i++) dbuf[i] = 0; /* fill with 0's */
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err = ferror (uptr -> fileref);
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for (i = p = 0; i < wc; i++) { /* copy buffer */
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M[MT_WC] = (M[MT_WC] + 1) & 0777777; /* inc WC, CA */
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M[MT_CA] = (M[MT_CA] + 1) & 0777777;
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xma = M[MT_CA] & ADDRMASK;
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if (PACKED (mt_cu)) { /* packed? */
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c1 = dbuf[p++] & 077;
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c2 = dbuf[p++] & 077;
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c3 = dbuf[p++] & 077;
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c = (c1 << 12) | (c2 << 6) | c3; }
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else { c1 = dbuf[p++];
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c2 = dbuf[p++];
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c = (c1 << 8) | c2; }
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if ((f == FN_READ) && MEM_ADDR_OK (xma)) M[xma] = c;
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else if ((f == FN_CMPARE) && (c != (M[xma] &
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(PACKED (mt_cu)? 0777777: 0177777)))) {
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mt_updcsta (uptr, STA_CPE);
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break; } }
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uptr -> pos = uptr -> pos + ((tbc + 1) & ~1) +
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(2 * sizeof (t_mtrlnt));
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break;
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case FN_WRITE: /* write */
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fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
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wc = DBSIZE - (M[MT_WC] & DBMASK); /* get word count */
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tbc = PACKED (mt_cu)? wc * 3: wc * 2;
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fxwrite (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
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for (i = p = 0; i < wc; i++) { /* copy buf to tape */
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M[MT_WC] = (M[MT_WC] + 1) & 0777777; /* inc WC, CA */
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M[MT_CA] = (M[MT_CA] + 1) & 0777777;
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xma = M[MT_CA] & ADDRMASK;
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if (PACKED (mt_cu)) { /* packed? */
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dbuf[p++] = (M[xma] >> 12) & 077;
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dbuf[p++] = (M[xma] >> 6) & 077;
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dbuf[p++] = M[xma] & 077; }
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else { dbuf[p++] = (M[xma] >> 8) & 0377;
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dbuf[p++] = M[xma] & 0377; } }
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fxwrite (dbuf, sizeof (char), (tbc + 1) & ~1, uptr -> fileref);
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fxwrite (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
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err = ferror (uptr -> fileref);
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uptr -> pos = uptr -> pos + ((tbc + 1) & ~1) +
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(2 * sizeof (t_mtrlnt));
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break;
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/* Unit service, continued */
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case FN_WREOF:
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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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uptr -> USTAT = STA_EOF;
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break;
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case FN_SPACEF: /* space forward */
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do { fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
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fxread (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref); /* read bc */
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if ((err = ferror (uptr -> fileref)) || /* error or eof? */
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feof (uptr -> fileref)) {
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uptr -> USTAT = STA_EOT;
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break; }
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if (tbc == 0) { /* zero bc? */
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uptr -> USTAT = STA_EOF;
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uptr -> pos = uptr -> pos + sizeof (t_mtrlnt);
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break; }
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uptr -> pos = uptr -> pos + ((MTRL (tbc) + 1) & ~1) +
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(2 * sizeof (t_mtrlnt)); }
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while ((M[MT_WC] = (M[MT_WC] + 1) & 0777777) != 0);
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break;
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case FN_SPACER: /* space reverse */
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if (uptr -> pos == 0) { /* at BOT? */
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uptr -> USTAT = STA_BOT;
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break; }
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do { 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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tbc = MTRL (tbc); /* ignore error flag */
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if ((err = ferror (uptr -> fileref)) || /* error or eof? */
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feof (uptr -> fileref)) {
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uptr -> USTAT = STA_BOT;
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uptr -> pos = 0;
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break; }
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if (tbc == 0) { /* end of file? */
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uptr -> USTAT = STA_EOF;
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uptr -> pos = uptr -> pos - sizeof (t_mtrlnt);
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break; }
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uptr -> pos = uptr -> pos - ((tbc + 1) & ~1) -
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(2 * sizeof (t_mtrlnt));
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if (uptr -> pos == 0) { /* at BOT? */
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uptr -> USTAT = STA_BOT;
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break; } }
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while ((M[MT_WC] = (M[MT_WC] + 1) & 0777777) != 0);
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break; } /* end case */
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/* Unit service, continued */
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if (err != 0) { /* I/O error */
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mt_updcsta (uptr, STA_PAR); /* flag error */
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perror ("MT I/O error");
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rval = SCPE_IOERR;
|
||
clearerr (uptr -> fileref); }
|
||
mt_updcsta (uptr, STA_DON); /* set done */
|
||
return IORETURN (mt_stopioe, rval);
|
||
}
|
||
|
||
/* Update controller status */
|
||
|
||
int32 mt_updcsta (UNIT *uptr, int32 new)
|
||
{
|
||
mt_sta = (mt_sta & ~(STA_DYN | STA_ERR | STA_CLR)) |
|
||
(uptr -> USTAT & STA_DYN) | new;
|
||
if (mt_sta & STA_EFLGS) mt_sta = mt_sta | STA_ERR; /* error flag */
|
||
if ((mt_sta & (STA_ERR | STA_DON)) && ((mt_cu & CU_IE) == 0))
|
||
SET_INT (MTA);
|
||
else CLR_INT (MTA); /* int request */
|
||
return mt_sta;
|
||
}
|
||
|
||
/* Test if controller busy */
|
||
|
||
UNIT *mt_busy (void)
|
||
{
|
||
int32 u;
|
||
UNIT *uptr;
|
||
|
||
for (u = 0; u < MT_NUMDR; u++) { /* loop thru units */
|
||
uptr = mt_dev.units + u;
|
||
if (sim_is_active (uptr) && ((uptr -> USTAT & STA_REW) == 0))
|
||
return uptr; }
|
||
return NULL;
|
||
}
|
||
|
||
/* Reset routine */
|
||
|
||
t_stat mt_reset (DEVICE *dptr)
|
||
{
|
||
int32 u;
|
||
UNIT *uptr;
|
||
|
||
mt_cu = mt_sta = 0;
|
||
for (u = 0; u < MT_NUMDR; u++) { /* loop thru units */
|
||
uptr = mt_dev.units + u;
|
||
uptr -> UNUM = u; /* init drive number */
|
||
sim_cancel (uptr); /* cancel activity */
|
||
if (uptr -> flags & UNIT_ATT) uptr -> USTAT = STA_BOT;
|
||
else uptr -> USTAT = 0; }
|
||
mt_updcsta (&mt_unit[0], 0); /* update status */
|
||
return SCPE_OK;
|
||
}
|
||
|
||
/* IORS routine */
|
||
|
||
int32 mt_iors (void)
|
||
{
|
||
return (mt_sta & (STA_ERR | STA_DON))? IOS_MTA: 0;
|
||
}
|
||
|
||
/* Attach routine */
|
||
|
||
t_stat mt_attach (UNIT *uptr, char *cptr)
|
||
{
|
||
t_stat r;
|
||
|
||
r = attach_unit (uptr, cptr);
|
||
if (r != SCPE_OK) return r;
|
||
uptr -> USTAT = STA_BOT;
|
||
mt_updcsta (mt_dev.units + GET_UNIT (mt_cu), 0); /* update status */
|
||
return r;
|
||
}
|
||
|
||
/* Detach routine */
|
||
|
||
t_stat mt_detach (UNIT* uptr)
|
||
{
|
||
if (!sim_is_active (uptr)) uptr -> USTAT = 0;
|
||
mt_updcsta (mt_dev.units + GET_UNIT (mt_cu), 0); /* update status */
|
||
return detach_unit (uptr);
|
||
}
|