| /* pdp18b_mt.c: 18b PDP magnetic tape simulator | |
| Copyright (c) 1993-2008, Robert M Supnik | |
| Permission is hereby granted, free of charge, to any person obtaining a | |
| copy of this software and associated documentation files (the "Software"), | |
| to deal in the Software without restriction, including without limitation | |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
| and/or sell copies of the Software, and to permit persons to whom the | |
| Software is furnished to do so, subject to the following conditions: | |
| The above copyright notice and this permission notice shall be included in | |
| all copies or substantial portions of the Software. | |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
| IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
| CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| Except as contained in this notice, the name of Robert M Supnik shall not be | |
| used in advertising or otherwise to promote the sale, use or other dealings | |
| in this Software without prior written authorization from Robert M Supnik. | |
| mt (PDP-9) TC59 magtape | |
| (PDP-15) TC59D magtape | |
| 14-Nov-08 RMS Replaced mt_log with standard debug facility | |
| 16-Feb-06 RMS Added tape capacity checking | |
| 16-Aug-05 RMS Fixed C++ declaration and cast problems | |
| 18-Mar-05 RMS Added attached test to detach routine | |
| 14-Jan-04 RMS Revised IO device call interface | |
| 25-Apr-03 RMS Revised for extended file support | |
| 28-Mar-03 RMS Added multiformat support | |
| 04-Mar-03 RMS Fixed bug in MTTR | |
| 01-Mar-03 RMS Fixed bug in interrupt handling | |
| Revised for magtape library | |
| 02-Feb-03 RMS Revised IOT decoding | |
| 30-Oct-02 RMS Revised BOT handling, added error record handling | |
| 05-Oct-02 RMS Added DIB, device number support | |
| Revamped error recovery | |
| 28-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 | |
| 06-Jan-02 RMS Revised enabled/disable support | |
| 29-Nov-01 RMS Added read only unit support | |
| 25-Nov-01 RMS Revised interrupt structure | |
| Changed UST, POS, FLG to arrays | |
| 26-Apr-01 RMS Added device enable/disable support | |
| 15-Feb-01 RMS Fixed 3-cycle data break sequence | |
| 04-Oct-98 RMS V2.4 magtape format | |
| 22-Jan-97 RMS V2.3 magtape format | |
| 29-Jun-96 RMS Added unit enable/disable support | |
| Magnetic tapes are represented as a series of variable records | |
| of the form: | |
| 32b byte count | |
| byte 0 | |
| byte 1 | |
| : | |
| byte n-2 | |
| byte n-1 | |
| 32 byte count | |
| If the byte count is odd, the record is padded with an extra byte | |
| of junk. File marks are represented by a byte count of 0. | |
| */ | |
| #include "pdp18b_defs.h" | |
| #include "sim_tape.h" | |
| #define MT_NUMDR 8 /* #drives */ | |
| #define USTAT u3 /* unit status */ | |
| #define MT_MAXFR (1 << 16) /* max record length */ | |
| #define MT_WC 032 /* word count */ | |
| #define MT_CA 033 /* current addr */ | |
| #define WC_SIZE (1 << 12) /* max word count */ | |
| #define WC_MASK (WC_SIZE - 1) | |
| /* Command/unit - mt_cu */ | |
| #define CU_V_UNIT 15 /* unit */ | |
| #define CU_M_UNIT 07 | |
| #define CU_PARITY 0040000 /* parity select */ | |
| #define CU_DUMP 0020000 /* dump mode */ | |
| #define CU_ERASE 0010000 /* ext rec gap */ | |
| #define CU_V_CMD 9 /* command */ | |
| #define CU_M_CMD 07 | |
| #define FN_NOP 00 | |
| #define FN_REWIND 01 | |
| #define FN_READ 02 | |
| #define FN_CMPARE 03 | |
| #define FN_WRITE 04 | |
| #define FN_WREOF 05 | |
| #define FN_SPACEF 06 | |
| #define FN_SPACER 07 | |
| #define CU_IE 0000400 /* interrupt enable */ | |
| #define CU_V_TYPE 6 /* drive type */ | |
| #define CU_M_TYPE 03 | |
| #define TY_9TK 3 | |
| #define GET_UNIT(x) (((x) >> CU_V_UNIT) & CU_M_UNIT) | |
| #define GET_CMD(x) (((x) >> CU_V_CMD) & CU_M_CMD) | |
| #define GET_TYPE(x) (((x) >> CU_V_TYPE) & CU_M_TYPE) | |
| #define PACKED(x) (((x) & CU_DUMP) || (GET_TYPE (x) != TY_9TK)) | |
| /* Status - stored in mt_sta or (*) uptr->USTAT */ | |
| #define STA_ERR 0400000 /* error */ | |
| #define STA_REW 0200000 /* *rewinding */ | |
| #define STA_BOT 0100000 /* *start of tape */ | |
| #define STA_ILL 0040000 /* illegal cmd */ | |
| #define STA_PAR 0020000 /* parity error */ | |
| #define STA_EOF 0010000 /* *end of file */ | |
| #define STA_EOT 0004000 /* *end of tape */ | |
| #define STA_CPE 0002000 /* compare error */ | |
| #define STA_RLE 0001000 /* rec lnt error */ | |
| #define STA_DLT 0000400 /* data late */ | |
| #define STA_BAD 0000200 /* bad tape */ | |
| #define STA_DON 0000100 /* done */ | |
| #define STA_CLR 0000077 /* always clear */ | |
| #define STA_DYN (STA_REW | STA_BOT | STA_EOF | STA_EOT) | |
| /* kept in USTAT */ | |
| extern int32 M[]; | |
| extern int32 int_hwre[API_HLVL+1]; | |
| extern UNIT cpu_unit; | |
| extern FILE *sim_deb; | |
| int32 mt_cu = 0; /* command/unit */ | |
| int32 mt_sta = 0; /* status register */ | |
| int32 mt_time = 10; /* record latency */ | |
| int32 mt_stopioe = 1; /* stop on error */ | |
| uint8 *mtxb = NULL; /* transfer buffer */ | |
| DEVICE mt_dev; | |
| int32 mt (int32 dev, int32 pulse, int32 dat); | |
| int32 mt_iors (void); | |
| t_stat mt_svc (UNIT *uptr); | |
| t_stat mt_reset (DEVICE *dptr); | |
| t_stat mt_attach (UNIT *uptr, char *cptr); | |
| t_stat mt_detach (UNIT *uptr); | |
| int32 mt_updcsta (UNIT *uptr, int32 val); | |
| t_stat mt_map_err (UNIT *uptr, t_stat st); | |
| UNIT *mt_busy (void); | |
| /* MT data structures | |
| mt_dev MT device descriptor | |
| mt_unit MT unit list | |
| mt_reg MT register list | |
| mt_mod MT modifier list | |
| */ | |
| DIB mt_dib = { DEV_MT, 1, &mt_iors, { &mt } }; | |
| UNIT mt_unit[] = { | |
| { UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) }, | |
| { UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) }, | |
| { UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) }, | |
| { UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) }, | |
| { UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) }, | |
| { UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) }, | |
| { UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) }, | |
| { UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) } | |
| }; | |
| REG mt_reg[] = { | |
| { ORDATA (STA, mt_sta, 18) }, | |
| { ORDATA (CMD, mt_cu, 18) }, | |
| { ORDATA (WC, M[MT_WC], 18) }, | |
| { ORDATA (CA, M[MT_CA], 18) }, | |
| { FLDATA (INT, int_hwre[API_MTA], INT_V_MTA) }, | |
| { FLDATA (STOP_IOE, mt_stopioe, 0) }, | |
| { DRDATA (TIME, mt_time, 24), PV_LEFT }, | |
| { URDATA (UST, mt_unit[0].USTAT, 8, 16, 0, MT_NUMDR, 0) }, | |
| { URDATA (POS, mt_unit[0].pos, 10, T_ADDR_W, 0, | |
| MT_NUMDR, PV_LEFT | REG_RO) }, | |
| { ORDATA (DEVNO, mt_dib.dev, 6), REG_HRO }, | |
| { NULL } | |
| }; | |
| MTAB mt_mod[] = { | |
| { MTUF_WLK, 0, "write enabled", "WRITEENABLED", NULL }, | |
| { MTUF_WLK, MTUF_WLK, "write locked", "LOCKED", NULL }, | |
| { MTAB_XTD|MTAB_VUN, 0, "FORMAT", "FORMAT", | |
| &sim_tape_set_fmt, &sim_tape_show_fmt, NULL }, | |
| { MTAB_XTD|MTAB_VUN, 0, "CAPACITY", "CAPACITY", | |
| &sim_tape_set_capac, &sim_tape_show_capac, NULL }, | |
| { MTAB_XTD|MTAB_VDV, 0, "DEVNO", "DEVNO", | |
| &set_devno, &show_devno, NULL }, | |
| { 0 } | |
| }; | |
| DEVICE mt_dev = { | |
| "MT", mt_unit, mt_reg, mt_mod, | |
| MT_NUMDR, 10, 31, 1, 8, 8, | |
| NULL, NULL, &mt_reset, | |
| NULL, &mt_attach, &mt_detach, | |
| &mt_dib, DEV_DISABLE | DEV_DEBUG | |
| }; | |
| /* IOT routine */ | |
| int32 mt (int32 dev, int32 pulse, int32 dat) | |
| { | |
| int32 f, sb; | |
| UNIT *uptr; | |
| uptr = mt_dev.units + GET_UNIT (mt_cu); /* get unit */ | |
| mt_updcsta (uptr, 0); /* update status */ | |
| sb = pulse & 060; /* subop */ | |
| if (pulse & 01) { | |
| if ((sb == 000) && (uptr->flags & UNIT_ATT) && /* MTTR */ | |
| !sim_is_active (uptr)) | |
| dat = IOT_SKP | dat; | |
| else if ((sb == 020) && !mt_busy ()) /* MTCR */ | |
| dat = IOT_SKP | dat; | |
| else if ((sb == 040) && (mt_sta & (STA_ERR | STA_DON))) /* MTSF */ | |
| dat = IOT_SKP | dat; | |
| } | |
| if ((pulse & 06) && DEBUG_PRS (mt_dev)) | |
| fprintf (sim_deb, "[MT%d: IOT=%o, AC=%o, sta=%o]\n", | |
| GET_UNIT (mt_cu), 0707300 + pulse, dat, mt_sta); | |
| if (pulse & 02) { | |
| if (sb == 000) /* MTRC */ | |
| dat = dat | (mt_cu & 0777700); | |
| else if (sb == 020) { /* MTAF, MTLC */ | |
| if (!mt_busy ()) /* if not busy, clr */ | |
| mt_cu = mt_sta = 0; | |
| mt_sta = mt_sta & ~(STA_ERR | STA_DON); /* clear flags */ | |
| } | |
| else if (sb == 040) dat = dat | mt_sta; /* MTRS */ | |
| } | |
| if (pulse & 04) { | |
| if (sb == 000) { /* MTGO */ | |
| f = GET_CMD (mt_cu); /* get function */ | |
| if (mt_busy () || | |
| sim_is_active (uptr) || | |
| (f == FN_NOP) || | |
| (((f == FN_SPACER) || (f == FN_REWIND)) && (uptr->USTAT & STA_BOT)) || | |
| (((f == FN_WRITE) || (f == FN_WREOF)) && sim_tape_wrp (uptr)) || | |
| ((uptr->flags & UNIT_ATT) == 0)) | |
| mt_sta = mt_sta | STA_ILL | STA_ERR; /* set illegal op */ | |
| else { | |
| if (f == FN_REWIND) /* rewind? */ | |
| uptr->USTAT = STA_REW; | |
| else mt_sta = uptr->USTAT = 0; /* no, clear status */ | |
| sim_activate (uptr, mt_time); /* start io */ | |
| } | |
| } | |
| if (sb == 020) /* MTCM, MTLC */ | |
| mt_cu = (mt_cu & 0770700) | (dat & 0777700); /* load status */ | |
| } | |
| mt_updcsta (mt_dev.units + GET_UNIT (mt_cu), 0); /* update status */ | |
| return dat; | |
| } | |
| /* Unit service | |
| If rewind done, reposition to start of tape, set status | |
| else, do operation, set done, interrupt | |
| */ | |
| t_stat mt_svc (UNIT *uptr) | |
| { | |
| int32 c, c1, c2, c3, f, i, p, u; | |
| int32 wc, xma; | |
| t_mtrlnt tbc, cbc; | |
| t_bool passed_eot; | |
| t_stat st, r = SCPE_OK; | |
| u = (int32) (uptr - mt_dev.units); /* get unit number */ | |
| f = GET_CMD (mt_cu); /* get command */ | |
| wc = WC_SIZE - (M[MT_WC] & WC_MASK); /* word count is 12b */ | |
| if (uptr->USTAT & STA_REW) { /* rewind? */ | |
| sim_tape_rewind (uptr); /* rewind tape */ | |
| if (uptr->flags & UNIT_ATT) | |
| uptr->USTAT = STA_BOT; | |
| else uptr->USTAT = 0; | |
| if (u == GET_UNIT (mt_cu)) | |
| mt_updcsta (uptr, STA_DON); | |
| if (DEBUG_PRS (mt_dev)) | |
| fprintf (sim_deb, "[MT%d: rewind complete, sta=%o]\n", u, mt_sta); | |
| return SCPE_OK; | |
| } | |
| if ((uptr->flags & UNIT_ATT) == 0) { /* if not attached */ | |
| mt_updcsta (uptr, STA_ILL); /* illegal operation */ | |
| return IORETURN (mt_stopioe, SCPE_UNATT); | |
| } | |
| passed_eot = sim_tape_eot (uptr); /* passed EOT? */ | |
| switch (f) { /* case on function */ | |
| case FN_READ: /* read */ | |
| case FN_CMPARE: /* read/compare */ | |
| st = sim_tape_rdrecf (uptr, mtxb, &tbc, MT_MAXFR); /* read rec */ | |
| if (st == MTSE_RECE) /* rec in err? */ | |
| mt_sta = mt_sta | STA_PAR | STA_ERR; | |
| else if (st != MTSE_OK) { /* other error? */ | |
| mt_sta = mt_sta | STA_RLE | STA_ERR; /* set RLE flag */ | |
| r = mt_map_err (uptr, st); /* map error */ | |
| break; | |
| } | |
| cbc = PACKED (mt_cu)? wc * 3: wc * 2; /* expected bc */ | |
| if (tbc != cbc) /* wrong size? */ | |
| mt_sta = mt_sta | STA_RLE | STA_ERR; | |
| if (tbc < cbc) { /* record small? */ | |
| cbc = tbc; /* use smaller */ | |
| wc = PACKED (mt_cu)? ((tbc + 2) / 3): ((tbc + 1) / 2); | |
| } | |
| for (i = p = 0; i < wc; i++) { /* copy buffer */ | |
| M[MT_WC] = (M[MT_WC] + 1) & DMASK; /* inc WC, CA */ | |
| M[MT_CA] = (M[MT_CA] + 1) & DMASK; | |
| xma = M[MT_CA] & AMASK; | |
| if (PACKED (mt_cu)) { /* packed? */ | |
| c1 = mtxb[p++] & 077; | |
| c2 = mtxb[p++] & 077; | |
| c3 = mtxb[p++] & 077; | |
| c = (c1 << 12) | (c2 << 6) | c3; | |
| } | |
| else { | |
| c1 = mtxb[p++]; | |
| c2 = mtxb[p++]; | |
| c = (c1 << 8) | c2; | |
| } | |
| if ((f == FN_READ) && MEM_ADDR_OK (xma)) | |
| M[xma] = c; | |
| else if ((f == FN_CMPARE) && (c != (M[xma] & | |
| (PACKED (mt_cu)? DMASK: 0177777)))) { | |
| mt_updcsta (uptr, STA_CPE); | |
| break; | |
| } | |
| } /* end for */ | |
| break; | |
| case FN_WRITE: /* write */ | |
| tbc = PACKED (mt_cu)? wc * 3: wc * 2; | |
| xma = M[MT_CA] & AMASK; /* get mem addr */ | |
| for (i = p = 0; i < wc; i++) { /* copy buf to tape */ | |
| xma = (xma + 1) & AMASK; /* incr mem addr */ | |
| if (PACKED (mt_cu)) { /* packed? */ | |
| mtxb[p++] = (M[xma] >> 12) & 077; | |
| mtxb[p++] = (M[xma] >> 6) & 077; | |
| mtxb[p++] = M[xma] & 077; | |
| } | |
| else { | |
| mtxb[p++] = (M[xma] >> 8) & 0377; | |
| mtxb[p++] = M[xma] & 0377; | |
| } | |
| } /* end for */ | |
| if ((st = sim_tape_wrrecf (uptr, mtxb, tbc))) /* write rec, err? */ | |
| r = mt_map_err (uptr, st); /* map error */ | |
| else { | |
| M[MT_CA] = (M[MT_CA] + wc) & DMASK; /* advance mem addr */ | |
| M[MT_WC] = 0; /* clear word cnt */ | |
| } | |
| mt_cu = mt_cu & ~CU_ERASE; /* clear erase flag */ | |
| break; | |
| case FN_WREOF: | |
| if ((st = sim_tape_wrtmk (uptr))) /* write tmk, err? */ | |
| r = mt_map_err (uptr, st); /* map error */ | |
| else uptr->USTAT = STA_EOF; | |
| mt_cu = mt_cu & ~CU_ERASE; /* clear erase flag */ | |
| break; | |
| case FN_SPACEF: /* space forward */ | |
| do { | |
| M[MT_WC] = (M[MT_WC] + 1) & DMASK; /* inc WC */ | |
| if ((st = sim_tape_sprecf (uptr, &tbc))) { /* space rec fwd, err? */ | |
| r = mt_map_err (uptr, st); /* map error */ | |
| break; | |
| } | |
| } while ((M[MT_WC] != 0) && (passed_eot || !sim_tape_eot (uptr))); | |
| break; | |
| case FN_SPACER: /* space reverse */ | |
| do { | |
| M[MT_WC] = (M[MT_WC] + 1) & DMASK; /* inc WC */ | |
| if ((st = sim_tape_sprecr (uptr, &tbc))) { /* space rec rev, err? */ | |
| r = mt_map_err (uptr, st); /* map error */ | |
| break; | |
| } | |
| } while (M[MT_WC] != 0); | |
| break; | |
| } /* end case */ | |
| if (!passed_eot && sim_tape_eot (uptr)) /* just passed EOT? */ | |
| uptr->USTAT = uptr->USTAT | STA_EOT; | |
| mt_updcsta (uptr, STA_DON); /* set done */ | |
| if (DEBUG_PRS (mt_dev)) | |
| fprintf (sim_deb, "MT%d: fnc=%d done, ma=%o, wc=%o, sta=%o]\n", | |
| u, f, M[MT_CA], M[MT_WC], mt_sta); | |
| return r; | |
| } | |
| /* Update controller status */ | |
| int32 mt_updcsta (UNIT *uptr, int32 news) | |
| { | |
| mt_sta = (mt_sta & ~(STA_DYN | STA_CLR)) | (uptr->USTAT & STA_DYN) | news; | |
| if ((mt_sta & (STA_ERR | STA_DON)) && (mt_cu & CU_IE)) | |
| 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; | |
| } | |
| /* Map tape error status */ | |
| t_stat mt_map_err (UNIT *uptr, t_stat st) | |
| { | |
| switch (st) { | |
| case MTSE_FMT: /* illegal fmt */ | |
| case MTSE_UNATT: /* not attached */ | |
| mt_sta = mt_sta | STA_ILL | STA_ERR; | |
| case MTSE_OK: /* no error */ | |
| return SCPE_IERR; | |
| case MTSE_TMK: /* end of file */ | |
| uptr->USTAT = uptr->USTAT | STA_EOF; /* set EOF */ | |
| mt_sta = mt_sta | STA_ERR; | |
| break; | |
| case MTSE_IOERR: /* IO error */ | |
| mt_sta = mt_sta | STA_PAR | STA_ERR; /* set par err */ | |
| if (mt_stopioe) | |
| return SCPE_IOERR; | |
| break; | |
| case MTSE_INVRL: /* invalid rec lnt */ | |
| mt_sta = mt_sta | STA_PAR | STA_ERR; /* set par err */ | |
| return SCPE_MTRLNT; | |
| case MTSE_RECE: /* record in error */ | |
| mt_sta = mt_sta | STA_PAR | STA_ERR; /* set par err */ | |
| break; | |
| case MTSE_EOM: /* end of medium */ | |
| mt_sta = mt_sta | STA_BAD | STA_ERR; /* set end tape */ | |
| break; | |
| case MTSE_BOT: /* reverse into BOT */ | |
| uptr->USTAT = uptr->USTAT | STA_BOT; /* set status */ | |
| mt_sta = mt_sta | STA_ERR; | |
| break; | |
| case MTSE_WRP: /* write protect */ | |
| mt_sta = mt_sta | STA_ILL | STA_ERR; /* illegal operation */ | |
| break; | |
| } | |
| return SCPE_OK; | |
| } | |
| /* 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; | |
| sim_tape_reset (uptr); /* reset tape */ | |
| 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 */ | |
| if (mtxb == NULL) | |
| mtxb = (uint8 *) calloc (MT_MAXFR, sizeof (uint8)); | |
| if (mtxb == NULL) | |
| return SCPE_MEM; | |
| 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 = sim_tape_attach (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 (!(uptr->flags & UNIT_ATT)) /* attached? */ | |
| return SCPE_OK; | |
| if (!sim_is_active (uptr)) | |
| uptr->USTAT = 0; | |
| mt_updcsta (mt_dev.units + GET_UNIT (mt_cu), 0); /* update status */ | |
| return sim_tape_detach (uptr); | |
| } |