| /* hp2100_mt.c: HP 2100 12559C 9-Track Magnetic Tape Unit Interface | |
| 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 | |
| AUTHORS 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. | |
| MT 12559C 9-Track Magnetic Tape Unit Interface | |
| 20-Jul-17 JDB Removed "mtc_stopioe" variable and register | |
| 13-Mar-17 JDB Deprecated LOCKED/WRITEENABLED for ATTACH -R | |
| 13-May-16 JDB Modified for revised SCP API function parameter types | |
| 24-Dec-14 JDB Added casts for explicit downward conversions | |
| 10-Jan-13 MP Added DEV_TAPE to DEVICE flags | |
| 09-May-12 JDB Separated assignments from conditional expressions | |
| 25-Mar-12 JDB Removed redundant MTAB_VUN from "format" MTAB entry | |
| 10-Feb-12 JDB Deprecated DEVNO in favor of SC | |
| 28-Mar-11 JDB Tidied up signal handling | |
| 29-Oct-10 JDB Fixed command scanning error in mtcio ioIOO handler | |
| 26-Oct-10 JDB Changed I/O signal handler for revised signal model | |
| 04-Sep-08 JDB Fixed missing flag after CLR command | |
| 02-Sep-08 JDB Moved write enable and format commands from MTD to MTC | |
| 26-Jun-08 JDB Rewrote device I/O to model backplane signals | |
| 28-Dec-06 JDB Added ioCRS state to I/O decoders | |
| 07-Oct-04 JDB Allow enable/disable from either device | |
| 14-Aug-04 RMS Modified handling of end of medium (suggested by Dave Bryan) | |
| 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 | |
| Implemented DMA SRQ (follows FLG) | |
| 21-Dec-03 RMS Adjusted msc_ctime for TSB (from Mike Gemeny) | |
| 25-Apr-03 RMS Revised for extended file support | |
| 28-Mar-03 RMS Added multiformat support | |
| 28-Feb-03 RMS Revised for magtape library | |
| 30-Sep-02 RMS Revamped error handling | |
| 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 | |
| 20-Jan-02 RMS Fixed bug on last character write | |
| 03-Dec-01 RMS Added read only unit, extended SET/SHOW support | |
| 07-Sep-01 RMS Moved function prototypes | |
| 30-Nov-00 RMS Made variable names unique | |
| 04-Oct-98 RMS V2.4 magtape format | |
| References: | |
| - 12559A 9-Track Magnetic Tape Unit Interface Kit Operating and Service Manual | |
| (12559-9001, July 1970) | |
| - SIMH Magtape Representation and Handling | |
| (Bob Supnik, 30-Aug-2006) | |
| The 3030 was one of HP's earliest tape drives. The 12559A controller | |
| supported a single 800 bpi, 9-track drive, operating at 75 inches per second. | |
| It had two unusual characteristics: | |
| - The controller accepted only one byte per I/O word, rather than packing | |
| two bytes per word. | |
| - The drive could not read or write fewer than 12 bytes per record. | |
| The first behavior meant that DMA operation required the byte-unpacking | |
| feature of the 12578A DMA card for the 2116 computer. The second meant that | |
| software drivers had to pad short records with blanks or nulls. | |
| Implementation notes: | |
| 1. The HP 3030 Magnetic Tape Subsystem diagnostic, part number 20433-60001, | |
| has never been located, so this simulator has not been fully tested. It | |
| does pass a functional test under DOS-III using driver DVR22. | |
| */ | |
| #include "hp2100_defs.h" | |
| #include "sim_tape.h" | |
| #define DB_V_SIZE 16 /* max data buf */ | |
| #define DBSIZE (1 << DB_V_SIZE) /* max data cmd */ | |
| /* Command - mtc_fnc */ | |
| #define FNC_CLR 0300 /* clear */ | |
| #define FNC_WC 0031 /* write */ | |
| #define FNC_RC 0023 /* read */ | |
| #define FNC_GAP 0011 /* write gap */ | |
| #define FNC_FSR 0003 /* forward space */ | |
| #define FNC_BSR 0041 /* backward space */ | |
| #define FNC_REW 0201 /* rewind */ | |
| #define FNC_RWS 0101 /* rewind and offline */ | |
| #define FNC_WFM 0035 /* write file mark */ | |
| /* Status - stored in mtc_sta, (d) = dynamic */ | |
| #define STA_LOCAL 0400 /* local (d) */ | |
| #define STA_EOF 0200 /* end of file */ | |
| #define STA_BOT 0100 /* beginning of tape */ | |
| #define STA_EOT 0040 /* end of tape */ | |
| #define STA_TIM 0020 /* timing error */ | |
| #define STA_REJ 0010 /* programming error */ | |
| #define STA_WLK 0004 /* write locked (d) */ | |
| #define STA_PAR 0002 /* parity error */ | |
| #define STA_BUSY 0001 /* busy (d) */ | |
| struct { | |
| FLIP_FLOP flag; /* flag flip-flop */ | |
| FLIP_FLOP flagbuf; /* flag buffer flip-flop */ | |
| } mtd = { CLEAR, CLEAR }; | |
| struct { | |
| FLIP_FLOP control; /* control flip-flop */ | |
| FLIP_FLOP flag; /* flag flip-flop */ | |
| FLIP_FLOP flagbuf; /* flag buffer flip-flop */ | |
| } mtc = { CLEAR, CLEAR, CLEAR }; | |
| int32 mtc_fnc = 0; /* function */ | |
| int32 mtc_sta = 0; /* status register */ | |
| int32 mtc_dtf = 0; /* data xfer flop */ | |
| int32 mtc_1st = 0; /* first svc flop */ | |
| int32 mtc_ctime = 40; /* command wait */ | |
| int32 mtc_gtime = 1000; /* gap stop time */ | |
| int32 mtc_xtime = 15; /* data xfer time */ | |
| uint8 mtxb[DBSIZE] = { 0 }; /* data buffer */ | |
| t_mtrlnt mt_ptr = 0, mt_max = 0; /* buffer ptrs */ | |
| static const uint32 mtc_cmd[] = { | |
| FNC_WC, FNC_RC, FNC_GAP, FNC_FSR, FNC_BSR, FNC_REW, FNC_RWS, FNC_WFM }; | |
| static const uint32 mtc_cmd_count = sizeof (mtc_cmd) / sizeof (mtc_cmd[0]); | |
| DEVICE mtd_dev, mtc_dev; | |
| IOHANDLER mtdio; | |
| IOHANDLER mtcio; | |
| t_stat mtc_svc (UNIT *uptr); | |
| t_stat mt_reset (DEVICE *dptr); | |
| t_stat mtc_attach (UNIT *uptr, CONST char *cptr); | |
| t_stat mtc_detach (UNIT *uptr); | |
| t_stat mt_map_err (UNIT *uptr, t_stat st); | |
| t_stat mt_clear (void); | |
| /* MTD data structures | |
| mtd_dev MTD device descriptor | |
| mtd_unit MTD unit list | |
| mtd_reg MTD register list | |
| */ | |
| DIB mt_dib[] = { | |
| { &mtdio, MTD }, | |
| { &mtcio, MTC } | |
| }; | |
| #define mtd_dib mt_dib[0] | |
| #define mtc_dib mt_dib[1] | |
| UNIT mtd_unit = { UDATA (NULL, 0, 0) }; | |
| REG mtd_reg[] = { | |
| { FLDATA (FLG, mtd.flag, 0) }, | |
| { FLDATA (FBF, mtd.flagbuf, 0) }, | |
| { BRDATA (DBUF, mtxb, 8, 8, DBSIZE) }, | |
| { DRDATA (BPTR, mt_ptr, DB_V_SIZE + 1) }, | |
| { DRDATA (BMAX, mt_max, DB_V_SIZE + 1) }, | |
| { ORDATA (SC, mtd_dib.select_code, 6), REG_HRO }, | |
| { ORDATA (DEVNO, mtd_dib.select_code, 6), REG_HRO }, | |
| { NULL } | |
| }; | |
| MTAB mtd_mod[] = { | |
| /* Entry Flags Value Print String Match String Validation Display Descriptor */ | |
| /* ------------------- ----- ------------ ------------ ------------ ------------- ---------------- */ | |
| { MTAB_XDV, 2u, "SC", "SC", &hp_set_dib, &hp_show_dib, (void *) &mt_dib }, | |
| { MTAB_XDV | MTAB_NMO, ~2u, "DEVNO", "DEVNO", &hp_set_dib, &hp_show_dib, (void *) &mt_dib }, | |
| { 0 } | |
| }; | |
| DEVICE mtd_dev = { | |
| "MTD", &mtd_unit, mtd_reg, mtd_mod, | |
| 1, 10, 16, 1, 8, 8, | |
| NULL, NULL, &mt_reset, | |
| NULL, NULL, NULL, | |
| &mtd_dib, DEV_DISABLE | DEV_DIS | |
| }; | |
| /* MTC data structures | |
| mtc_dev MTC device descriptor | |
| mtc_unit MTC unit list | |
| mtc_reg MTC register list | |
| mtc_mod MTC modifier list | |
| */ | |
| UNIT mtc_unit = { UDATA (&mtc_svc, UNIT_ATTABLE + UNIT_ROABLE, 0) }; | |
| REG mtc_reg[] = { | |
| { ORDATA (FNC, mtc_fnc, 8) }, | |
| { ORDATA (STA, mtc_sta, 9) }, | |
| { ORDATA (BUF, mtc_unit.buf, 8) }, | |
| { FLDATA (CTL, mtc.control, 0) }, | |
| { FLDATA (FLG, mtc.flag, 0) }, | |
| { FLDATA (FBF, mtc.flagbuf, 0) }, | |
| { FLDATA (DTF, mtc_dtf, 0) }, | |
| { FLDATA (FSVC, mtc_1st, 0) }, | |
| { DRDATA (POS, mtc_unit.pos, T_ADDR_W), PV_LEFT }, | |
| { DRDATA (CTIME, mtc_ctime, 24), REG_NZ + PV_LEFT }, | |
| { DRDATA (GTIME, mtc_gtime, 24), REG_NZ + PV_LEFT }, | |
| { DRDATA (XTIME, mtc_xtime, 24), REG_NZ + PV_LEFT }, | |
| { ORDATA (SC, mtc_dib.select_code, 6), REG_HRO }, | |
| { ORDATA (DEVNO, mtc_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. | |
| 2. FORMAT is really a unit option, but as there is only one unit, it is | |
| specified as MTAB_XDV so that SHOW MTC FORMAT is accepted, rather than | |
| requiring SHOW MTC0 FORMAT. | |
| */ | |
| MTAB mtc_mod [] = { | |
| /* Mask Value Match Value Print String Match String Validation Display Descriptor */ | |
| /* ------------- ------------- ---------------- --------------- ------------ ------- ---------- */ | |
| { UNIT_RO, 0, "write ring", NULL, NULL, 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_XDV, 0, "FORMAT", "FORMAT", &sim_tape_set_fmt, &sim_tape_show_fmt, NULL }, | |
| { MTAB_XDV, 2u, "SC", "SC", &hp_set_dib, &hp_show_dib, (void *) &mt_dib }, | |
| { MTAB_XDV | MTAB_NMO, ~2u, "DEVNO", "DEVNO", &hp_set_dib, &hp_show_dib, (void *) &mt_dib }, | |
| { 0 } | |
| }; | |
| DEVICE mtc_dev = { | |
| "MTC", &mtc_unit, mtc_reg, mtc_mod, | |
| 1, 10, 31, 1, 8, 8, | |
| NULL, NULL, &mt_reset, | |
| NULL, &mtc_attach, &mtc_detach, | |
| &mtc_dib, DEV_DISABLE | DEV_DIS | DEV_TAPE | |
| }; | |
| /* Data channel I/O signal handler | |
| The 12559A data channel interface has a number of non-standard features: | |
| - The card does not drive PRL or IRQ. | |
| - The card does not respond to IAK. | |
| - There is no control flip-flop; CLC resets the data transfer flip-flop. | |
| - POPIO issues a CLR command and clears the flag and flag buffer flip-flops. | |
| - CRS is not used. | |
| Implementation notes: | |
| 1. The data channel has a flag buffer flip-flop (necessary for the proper | |
| timing of the flag flip-flop), but the data channel does not interrupt, | |
| so the flag buffer serves no other purpose. | |
| */ | |
| uint32 mtdio (DIB *dibptr, IOCYCLE signal_set, uint32 stat_data) | |
| { | |
| 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 */ | |
| mtd.flag = mtd.flagbuf = CLEAR; | |
| break; | |
| case ioSTF: /* set flag flip-flop */ | |
| case ioENF: /* enable flag */ | |
| mtd.flag = mtd.flagbuf = SET; | |
| break; | |
| case ioSFC: /* skip if flag is clear */ | |
| setstdSKF (mtd); | |
| break; | |
| case ioSFS: /* skip if flag is set */ | |
| setstdSKF (mtd); | |
| break; | |
| case ioIOI: /* I/O data input */ | |
| stat_data = IORETURN (SCPE_OK, mtc_unit.buf); /* merge in return status */ | |
| break; | |
| case ioIOO: /* I/O data output */ | |
| mtc_unit.buf = IODATA (stat_data) & DMASK8; /* store data */ | |
| break; | |
| case ioPOPIO: /* power-on preset to I/O */ | |
| mt_clear (); /* issue CLR to controller */ | |
| mtd.flag = mtd.flagbuf = CLEAR; /* clear flag and flag buffer */ | |
| break; | |
| case ioCLC: /* clear control flip-flop */ | |
| mtc_dtf = 0; /* clr xfer flop */ | |
| mtd.flag = mtd.flagbuf = CLEAR; /* clear flag and flag buffer */ | |
| break; | |
| case ioSIR: /* set interrupt request */ | |
| setstdSRQ (mtd); /* set standard SRQ signal */ | |
| 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. | |
| The 12559A command interface is reasonably standard, although POPIO clears, | |
| rather than sets, the flag and flag buffer flip-flops. One unusual feature | |
| is that commands are initiated when they are output to the interface with | |
| OTA/B, rather than waiting until control is set with STC. STC simply enables | |
| command-channel interrupts. | |
| Implementation notes: | |
| 1. In hardware, the command channel card passes PRH to PRL. The data card | |
| actually drives PRL with the command channel's control and flag states. | |
| That is, the priority chain is broken at the data card, although 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. | |
| 2. In hardware, the CLR command takes 5 milliseconds to complete. During | |
| this time, the BUSY bit is set in the status word. Under simulation, we | |
| complete immediately, and the BUSY bit never sets.. | |
| */ | |
| uint32 mtcio (DIB *dibptr, IOCYCLE signal_set, uint32 stat_data) | |
| { | |
| uint16 data; | |
| uint32 i; | |
| int32 valid; | |
| 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 */ | |
| mtc.flag = mtc.flagbuf = CLEAR; | |
| break; | |
| case ioSTF: /* set flag flip-flop */ | |
| case ioENF: /* enable flag */ | |
| mtc.flag = mtc.flagbuf = SET; | |
| break; | |
| case ioSFC: /* skip if flag is clear */ | |
| setstdSKF (mtc); | |
| break; | |
| case ioSFS: /* skip if flag is set */ | |
| setstdSKF (mtc); | |
| break; | |
| case ioIOI: /* I/O data input */ | |
| data = mtc_sta & ~(STA_LOCAL | STA_WLK | STA_BUSY); | |
| if (mtc_unit.flags & UNIT_ATT) { /* construct status */ | |
| if (sim_is_active (&mtc_unit)) | |
| data = data | STA_BUSY; | |
| if (sim_tape_wrp (&mtc_unit)) | |
| data = data | STA_WLK; | |
| } | |
| else | |
| data = data | STA_BUSY | STA_LOCAL; | |
| stat_data = IORETURN (SCPE_OK, data); /* merge in return status */ | |
| break; | |
| case ioIOO: /* I/O data output */ | |
| data = IODATA (stat_data) & DMASK8; | |
| mtc_sta = mtc_sta & ~STA_REJ; /* clear reject */ | |
| if (data == FNC_CLR) { /* clear? */ | |
| mt_clear (); /* send CLR to controller */ | |
| mtd.flag = mtd.flagbuf = CLEAR; /* clear data flag and flag buffer */ | |
| mtc.flag = mtc.flagbuf = SET; /* set command flag and flag buffer */ | |
| break; /* command completes immediately */ | |
| } | |
| for (i = valid = 0; i < mtc_cmd_count; i++) /* is fnc valid? */ | |
| if (data == mtc_cmd[i]) { | |
| valid = 1; | |
| break; | |
| } | |
| if (!valid || sim_is_active (&mtc_unit) || /* is cmd valid? */ | |
| ((mtc_sta & STA_BOT) && (data == FNC_BSR)) || | |
| (sim_tape_wrp (&mtc_unit) && | |
| ((data == FNC_WC) || (data == FNC_GAP) || (data == FNC_WFM)))) | |
| mtc_sta = mtc_sta | STA_REJ; | |
| else { | |
| sim_activate (&mtc_unit, mtc_ctime); /* start tape */ | |
| mtc_fnc = data; /* save function */ | |
| mtc_sta = STA_BUSY; /* unit busy */ | |
| mt_ptr = 0; /* init buffer ptr */ | |
| mtcio (&mtc_dib, ioCLF, 0); /* clear flags */ | |
| mtcio (&mtd_dib, ioCLF, 0); | |
| mtc_1st = 1; /* set 1st flop */ | |
| mtc_dtf = 1; /* set xfer flop */ | |
| } | |
| break; | |
| case ioPOPIO: /* power-on preset to I/O */ | |
| mtc.flag = mtc.flagbuf = CLEAR; /* clear flag and flag buffer */ | |
| break; | |
| case ioCRS: /* control reset */ | |
| case ioCLC: /* clear control flip-flop */ | |
| mtc.control = CLEAR; | |
| break; | |
| case ioSTC: /* set control flip-flop */ | |
| mtc.control = SET; | |
| break; | |
| case ioSIR: /* set interrupt request */ | |
| setstdPRL (mtc); /* set standard PRL signal */ | |
| setstdIRQ (mtc); /* set standard IRQ signal */ | |
| setstdSRQ (mtc); /* set standard SRQ signal */ | |
| break; | |
| case ioIAK: /* interrupt acknowledge */ | |
| mtc.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 | |
| Can't be write locked, can only write lock detached unit | |
| */ | |
| t_stat mtc_svc (UNIT *uptr) | |
| { | |
| t_mtrlnt tbc; | |
| t_stat st, r = SCPE_OK; | |
| if ((mtc_unit.flags & UNIT_ATT) == 0) { /* offline? */ | |
| mtc_sta = STA_LOCAL | STA_REJ; /* rejected */ | |
| mtcio (&mtc_dib, ioENF, 0); /* set cch flg */ | |
| return SCPE_OK; | |
| } | |
| switch (mtc_fnc) { /* case on function */ | |
| case FNC_REW: /* rewind */ | |
| sim_tape_rewind (uptr); /* BOT */ | |
| mtc_sta = STA_BOT; /* update status */ | |
| break; | |
| case FNC_RWS: /* rewind and offline */ | |
| sim_tape_rewind (uptr); /* clear position */ | |
| return sim_tape_detach (uptr); /* don't set cch flg */ | |
| case FNC_WFM: /* write file mark */ | |
| st = sim_tape_wrtmk (uptr); /* write tmk */ | |
| if (st != MTSE_OK) /* error? */ | |
| r = mt_map_err (uptr, st); /* map error */ | |
| mtc_sta = STA_EOF; /* set EOF status */ | |
| break; | |
| case FNC_GAP: /* erase gap */ | |
| break; | |
| case FNC_FSR: /* space forward */ | |
| st = sim_tape_sprecf (uptr, &tbc); /* space rec fwd */ | |
| if (st != MTSE_OK) /* error? */ | |
| r = mt_map_err (uptr, st); /* map error */ | |
| break; | |
| case FNC_BSR: /* space reverse */ | |
| st = sim_tape_sprecr (uptr, &tbc); /* space rec rev */ | |
| if (st != MTSE_OK) /* error? */ | |
| r = mt_map_err (uptr, st); /* map error */ | |
| break; | |
| case FNC_RC: /* read */ | |
| if (mtc_1st) { /* first svc? */ | |
| mtc_1st = mt_ptr = 0; /* clr 1st flop */ | |
| st = sim_tape_rdrecf (uptr, mtxb, &mt_max, DBSIZE); /* read rec */ | |
| if (st == MTSE_RECE) mtc_sta = mtc_sta | STA_PAR; /* rec in err? */ | |
| else if (st != MTSE_OK) { /* other error? */ | |
| r = mt_map_err (uptr, st); /* map error */ | |
| if (r == SCPE_OK) { /* recoverable? */ | |
| sim_activate (uptr, mtc_gtime); /* sched IRG */ | |
| mtc_fnc = 0; /* NOP func */ | |
| return SCPE_OK; | |
| } | |
| break; /* non-recov, done */ | |
| } | |
| if (mt_max < 12) { /* record too short? */ | |
| mtc_sta = mtc_sta | STA_PAR; /* set flag */ | |
| break; | |
| } | |
| } | |
| if (mtc_dtf && (mt_ptr < mt_max)) { /* more chars? */ | |
| if (mtd.flag) mtc_sta = mtc_sta | STA_TIM; | |
| mtc_unit.buf = mtxb[mt_ptr++]; /* fetch next */ | |
| mtdio (&mtd_dib, ioENF, 0); /* set dch flg */ | |
| sim_activate (uptr, mtc_xtime); /* re-activate */ | |
| return SCPE_OK; | |
| } | |
| sim_activate (uptr, mtc_gtime); /* schedule gap */ | |
| mtc_fnc = 0; /* nop */ | |
| return SCPE_OK; | |
| case FNC_WC: /* write */ | |
| if (mtc_1st) mtc_1st = 0; /* no xfr on first */ | |
| else { | |
| if (mt_ptr < DBSIZE) { /* room in buffer? */ | |
| mtxb[mt_ptr++] = (uint8) mtc_unit.buf; | |
| mtc_sta = mtc_sta & ~STA_BOT; /* clear BOT */ | |
| } | |
| else mtc_sta = mtc_sta | STA_PAR; | |
| } | |
| if (mtc_dtf) { /* xfer flop set? */ | |
| mtdio (&mtd_dib, ioENF, 0); /* set dch flg */ | |
| sim_activate (uptr, mtc_xtime); /* re-activate */ | |
| return SCPE_OK; | |
| } | |
| if (mt_ptr) { /* write buffer */ | |
| st = sim_tape_wrrecf (uptr, mtxb, mt_ptr); /* write */ | |
| if (st != MTSE_OK) { /* error? */ | |
| r = mt_map_err (uptr, st); /* map error */ | |
| break; /* done */ | |
| } | |
| } | |
| sim_activate (uptr, mtc_gtime); /* schedule gap */ | |
| mtc_fnc = 0; /* nop */ | |
| return SCPE_OK; | |
| default: /* unknown */ | |
| break; | |
| } | |
| mtcio (&mtc_dib, ioENF, 0); /* set cch flg */ | |
| mtc_sta = mtc_sta & ~STA_BUSY; /* not busy */ | |
| return r; | |
| } | |
| /* Map tape error status */ | |
| t_stat mt_map_err (UNIT *uptr, t_stat st) | |
| { | |
| switch (st) { | |
| case MTSE_FMT: /* illegal fmt */ | |
| case MTSE_UNATT: /* unattached */ | |
| mtc_sta = mtc_sta | STA_REJ; /* reject */ | |
| case MTSE_OK: /* no error */ | |
| return SCPE_IERR; /* never get here! */ | |
| case MTSE_EOM: /* end of medium */ | |
| case MTSE_TMK: /* end of file */ | |
| mtc_sta = mtc_sta | STA_EOF; /* eof */ | |
| break; | |
| case MTSE_IOERR: /* IO error */ | |
| mtc_sta = mtc_sta | STA_PAR; /* error */ | |
| return SCPE_IOERR; | |
| break; | |
| case MTSE_INVRL: /* invalid rec lnt */ | |
| mtc_sta = mtc_sta | STA_PAR; | |
| return SCPE_MTRLNT; | |
| case MTSE_RECE: /* record in error */ | |
| mtc_sta = mtc_sta | STA_PAR; /* error */ | |
| break; | |
| case MTSE_BOT: /* reverse into BOT */ | |
| mtc_sta = mtc_sta | STA_BOT; /* set status */ | |
| break; | |
| case MTSE_WRP: /* write protect */ | |
| mtc_sta = mtc_sta | STA_REJ; /* reject */ | |
| break; | |
| } | |
| return SCPE_OK; | |
| } | |
| /* Controller clear */ | |
| t_stat mt_clear (void) | |
| { | |
| t_stat st; | |
| if (sim_is_active (&mtc_unit) && /* write in prog? */ | |
| (mtc_fnc == FNC_WC) && (mt_ptr > 0)) { /* yes, bad rec */ | |
| st = sim_tape_wrrecf (&mtc_unit, mtxb, mt_ptr | MTR_ERF); | |
| if (st != MTSE_OK) | |
| mt_map_err (&mtc_unit, st); | |
| } | |
| if (((mtc_fnc == FNC_REW) || (mtc_fnc == FNC_RWS)) && sim_is_active (&mtc_unit)) | |
| sim_cancel (&mtc_unit); | |
| mtc_1st = mtc_dtf = 0; | |
| mtc_sta = mtc_sta & STA_BOT; | |
| return SCPE_OK; | |
| } | |
| /* Reset routine */ | |
| t_stat mt_reset (DEVICE *dptr) | |
| { | |
| DIB *dibptr = (DIB *) dptr->ctxt; /* DIB pointer */ | |
| hp_enbdis_pair (dptr, /* make pair cons */ | |
| (dptr == &mtd_dev) ? &mtc_dev : &mtd_dev); | |
| IOPRESET (dibptr); /* PRESET device (does not use PON) */ | |
| mtc_fnc = 0; | |
| mtc_1st = mtc_dtf = 0; | |
| sim_cancel (&mtc_unit); /* cancel activity */ | |
| sim_tape_reset (&mtc_unit); | |
| if (mtc_unit.flags & UNIT_ATT) | |
| mtc_sta = (sim_tape_bot (&mtc_unit)? STA_BOT: 0) | | |
| (sim_tape_wrp (&mtc_unit)? STA_WLK: 0); | |
| else | |
| mtc_sta = STA_LOCAL | STA_BUSY; | |
| return SCPE_OK; | |
| } | |
| /* Attach routine */ | |
| t_stat mtc_attach (UNIT *uptr, CONST char *cptr) | |
| { | |
| t_stat r; | |
| r = sim_tape_attach (uptr, cptr); /* attach unit */ | |
| if (r != SCPE_OK) return r; /* update status */ | |
| mtc_sta = STA_BOT; | |
| return r; | |
| } | |
| /* Detach routine */ | |
| t_stat mtc_detach (UNIT* uptr) | |
| { | |
| mtc_sta = 0; /* update status */ | |
| return sim_tape_detach (uptr); /* detach unit */ | |
| } |