| /* pdp18b_stddev.c: 18b PDP's standard devices | |
| Copyright (c) 1993-2015, 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. | |
| ptr paper tape reader | |
| ptp paper tape punch | |
| tti keyboard | |
| tto teleprinter | |
| clk clock | |
| 13-Sep-15 RMS Added APIVEC register to PTR, CLK only | |
| 28-Mar-15 RMS Revised to use sim_printf | |
| 18-Apr-12 RMS Added clk_cosched routine | |
| Revised clk and tti scheduling | |
| 18-Jun-07 RMS Added UNIT_IDLE to console input, clock | |
| 18-Oct-06 RMS Added PDP-15 programmable duplex control | |
| Fixed handling of non-printable characters in KSR mode | |
| Changed clock to be free-running | |
| Fixed out-of-tape behavior for PDP-9 vs PDP-15 | |
| Synced keyboard to clock | |
| 30-Jun-06 RMS Fixed KSR-28 shift tracking | |
| 20-Jun-06 RMS Added KSR ASCII reader support | |
| 13-Jun-06 RMS Fixed Baudot letters/figures inversion for PDP-4 | |
| Fixed PDP-4/PDP-7 default terminal to be local echo | |
| 22-Nov-05 RMS Revised for new terminal processing routines | |
| 28-May-04 RMS Removed SET TTI CTRL-C | |
| 16-Feb-04 RMS Fixed bug in hardware read-in mode bootstrap | |
| 14-Jan-04 RMS Revised IO device call interface | |
| CAF does not turn off the clock | |
| 29-Dec-03 RMS Added console backpressure support | |
| 26-Jul-03 RMS Increased PTP, TTO timeouts for PDP-15 operating systems | |
| Added hardware read-in mode support for PDP-7/9/15 | |
| 25-Apr-03 RMS Revised for extended file support | |
| 14-Mar-03 RMS Clean up flags on detach | |
| 01-Mar-03 RMS Added SET/SHOW CLK freq, SET TTI CTRL-C | |
| 22-Dec-02 RMS Added break support | |
| 01-Nov-02 RMS Added 7B/8B support to terminal | |
| 05-Oct-02 RMS Added DIBs, device number support, IORS call | |
| 14-Jul-02 RMS Added ASCII reader/punch support (Hans Pufal) | |
| 30-May-02 RMS Widened POS to 32b | |
| 29-Nov-01 RMS Added read only unit support | |
| 25-Nov-01 RMS Revised interrupt structure | |
| 17-Sep-01 RMS Removed multiconsole support | |
| 07-Sep-01 RMS Added terminal multiplexor support | |
| 17-Jul-01 RMS Moved function prototype | |
| 10-Jun-01 RMS Cleaned up IOT decoding to reflect hardware | |
| 27-May-01 RMS Added multiconsole support | |
| 10-Mar-01 RMS Added funny format loader support | |
| 05-Mar-01 RMS Added clock calibration support | |
| 22-Dec-00 RMS Added PDP-9/15 half duplex support | |
| 30-Nov-00 RMS Fixed PDP-4/7 bootstrap loader for 4K systems | |
| 30-Oct-00 RMS Standardized register naming | |
| 06-Jan-97 RMS Fixed PDP-4 console input | |
| 16-Dec-96 RMS Fixed bug in binary ptr service | |
| */ | |
| #include "pdp18b_defs.h" | |
| #include "sim_tmxr.h" | |
| #include <ctype.h> | |
| #define UNIT_V_RASCII (UNIT_V_UF + 0) /* reader ASCII */ | |
| #define UNIT_RASCII (1 << UNIT_V_RASCII) | |
| #define UNIT_V_KASCII (UNIT_V_UF + 1) /* KSR ASCII */ | |
| #define UNIT_KASCII (1 << UNIT_V_KASCII) | |
| #define UNIT_V_PASCII (UNIT_V_UF + 0) /* punch ASCII */ | |
| #define UNIT_PASCII (1 << UNIT_V_PASCII) | |
| extern int32 M[]; | |
| extern int32 int_hwre[API_HLVL+1], PC, ASW; | |
| extern int32 api_vec[API_HLVL][32]; | |
| extern UNIT cpu_unit; | |
| int32 clk_state = 0; | |
| int32 ptr_err = 0, ptr_stopioe = 0, ptr_state = 0; | |
| int32 ptp_err = 0, ptp_stopioe = 0; | |
| int32 tti_2nd = 0; /* 2nd char waiting */ | |
| int32 tty_shift = 0; /* KSR28 shift state */ | |
| int32 tti_fdpx = 0; /* prog mode full duplex */ | |
| int32 clk_tps = 60; /* ticks/second */ | |
| int32 tmxr_poll = 16000; /* term mux poll */ | |
| uint32 clk_task_last = 0; | |
| uint32 clk_task_timer = 0; | |
| const int32 asc_to_baud[128] = { | |
| 000,000,000,000,000,000,000,064, /* bell */ | |
| 000,000,0110,000,000,0102,000,000, /* lf, cr */ | |
| 000,000,000,000,000,000,000,000, | |
| 000,000,000,000,000,000,000,000, | |
| 0104,066,061,045,062,000,053,072, /* space - ' */ | |
| 076,051,000,000,046,070,047,067, /* ( - / */ | |
| 055,075,071,060,052,041,065,074, /* 0 - 7 */ | |
| 054,043,056,057,000,000,000,063, /* 8 - ? */ | |
| 000,030,023,016,022,020,026,013, /* @ - G */ | |
| 005,014,032,036,011,007,006,003, /* H - O */ | |
| 015,035,012,024,001,034,017,031, /* P - W */ | |
| 027,025,021,000,000,000,000,000, /* X - _ */ | |
| 000,030,023,016,022,020,026,013, /* ` - g */ | |
| 005,014,032,036,011,007,006,003, /* h - o */ | |
| 015,035,012,024,001,034,017,031, /* p - w */ | |
| 027,025,021,000,000,000,000,000 /* x - DEL */ | |
| }; | |
| const char baud_to_asc[64] = { | |
| 0 ,'T',015,'O',' ','H','N','M', | |
| 012,'L','R','G','I','P','C','V', | |
| 'E','Z','D','B','S','Y','F','X', | |
| 'A','W','J', 0 ,'U','Q','K', 0, | |
| 0 ,'5','\r','9',' ','#',',','.', | |
| 012,')','4','&','8','0',':',';', | |
| '3','"','$','?','\a','6','!','/', | |
| '-','2','\'',0 ,'7','1','(', 0 | |
| }; | |
| int32 ptr (int32 dev, int32 pulse, int32 dat); | |
| int32 ptp (int32 dev, int32 pulse, int32 dat); | |
| int32 tti (int32 dev, int32 pulse, int32 dat); | |
| int32 tto (int32 dev, int32 pulse, int32 dat); | |
| int32 clk_iors (void); | |
| int32 ptr_iors (void); | |
| int32 ptp_iors (void); | |
| int32 tti_iors (void); | |
| int32 tto_iors (void); | |
| t_stat clk_svc (UNIT *uptr); | |
| t_stat ptr_svc (UNIT *uptr); | |
| t_stat ptp_svc (UNIT *uptr); | |
| t_stat tti_svc (UNIT *uptr); | |
| t_stat tto_svc (UNIT *uptr); | |
| t_stat clk_reset (DEVICE *dptr); | |
| t_stat ptr_reset (DEVICE *dptr); | |
| t_stat ptp_reset (DEVICE *dptr); | |
| t_stat tti_reset (DEVICE *dptr); | |
| t_stat tto_reset (DEVICE *dptr); | |
| t_stat ptr_attach (UNIT *uptr, char *cptr); | |
| t_stat ptp_attach (UNIT *uptr, char *cptr); | |
| t_stat ptr_detach (UNIT *uptr); | |
| t_stat ptp_detach (UNIT *uptr); | |
| t_stat ptr_boot (int32 unitno, DEVICE *dptr); | |
| t_stat tty_set_mode (UNIT *uptr, int32 val, char *cptr, void *desc); | |
| t_stat clk_set_freq (UNIT *uptr, int32 val, char *cptr, void *desc); | |
| t_stat clk_show_freq (FILE *st, UNIT *uptr, int32 val, void *desc); | |
| int32 clk_task_upd (t_bool clr); | |
| extern int32 upd_iors (void); | |
| /* CLK data structures | |
| clk_dev CLK device descriptor | |
| clk_unit CLK unit | |
| clk_reg CLK register list | |
| */ | |
| DIB clk_dib = { 0, 0, &clk_iors, { NULL } }; | |
| UNIT clk_unit = { UDATA (&clk_svc, UNIT_IDLE, 0), 16000 }; | |
| REG clk_reg[] = { | |
| { FLDATA (INT, int_hwre[API_CLK], INT_V_CLK) }, | |
| { FLDATA (DONE, int_hwre[API_CLK], INT_V_CLK) }, | |
| { FLDATA (ENABLE, clk_state, 0) }, | |
| #if defined (PDP15) | |
| { ORDATA (TASKTIMER, clk_task_timer, 18) }, | |
| { DRDATA (TASKLAST, clk_task_last, 32), REG_HRO }, | |
| #endif | |
| { DRDATA (TIME, clk_unit.wait, 24), REG_NZ + PV_LEFT }, | |
| { DRDATA (TPS, clk_tps, 8), PV_LEFT + REG_HRO }, | |
| { ORDATA (APIVEC, api_vec[API_CLK][INT_V_CLK], 6), REG_HRO }, | |
| { NULL } | |
| }; | |
| MTAB clk_mod[] = { | |
| { MTAB_XTD|MTAB_VDV, 50, NULL, "50HZ", | |
| &clk_set_freq, NULL, NULL }, | |
| { MTAB_XTD|MTAB_VDV, 60, NULL, "60HZ", | |
| &clk_set_freq, NULL, NULL }, | |
| { MTAB_XTD|MTAB_VDV, 0, "FREQUENCY", NULL, | |
| NULL, &clk_show_freq, NULL }, | |
| { MTAB_XTD|MTAB_VDV, 0, "DEVNO", NULL, NULL, &show_devno }, | |
| { 0 } | |
| }; | |
| DEVICE clk_dev = { | |
| "CLK", &clk_unit, clk_reg, clk_mod, | |
| 1, 0, 0, 0, 0, 0, | |
| NULL, NULL, &clk_reset, | |
| NULL, NULL, NULL, | |
| &clk_dib, 0 | |
| }; | |
| /* PTR data structures | |
| ptr_dev PTR device descriptor | |
| ptr_unit PTR unit | |
| ptr_reg PTR register list | |
| */ | |
| DIB ptr_dib = { DEV_PTR, 1, &ptr_iors, { &ptr } }; | |
| UNIT ptr_unit = { | |
| UDATA (&ptr_svc, UNIT_SEQ+UNIT_ATTABLE+UNIT_ROABLE, 0), | |
| SERIAL_IN_WAIT | |
| }; | |
| REG ptr_reg[] = { | |
| { ORDATA (BUF, ptr_unit.buf, 18) }, | |
| { FLDATA (INT, int_hwre[API_PTR], INT_V_PTR) }, | |
| { FLDATA (DONE, int_hwre[API_PTR], INT_V_PTR) }, | |
| #if defined (IOS_PTRERR) | |
| { FLDATA (ERR, ptr_err, 0) }, | |
| #endif | |
| { ORDATA (STATE, ptr_state, 5), REG_HRO }, | |
| { DRDATA (POS, ptr_unit.pos, T_ADDR_W), PV_LEFT }, | |
| { DRDATA (TIME, ptr_unit.wait, 24), PV_LEFT }, | |
| { FLDATA (STOP_IOE, ptr_stopioe, 0) }, | |
| { ORDATA (APIVEC, api_vec[API_PTR][INT_V_PTR], 6), REG_HRO }, | |
| { NULL } | |
| }; | |
| MTAB ptr_mod[] = { | |
| { UNIT_RASCII, UNIT_RASCII, "even parity ASCII", NULL }, | |
| { UNIT_KASCII, UNIT_KASCII, "forced parity ASCII", NULL }, | |
| { MTAB_XTD|MTAB_VDV, 0, "DEVNO", NULL, NULL, &show_devno }, | |
| { 0 } | |
| }; | |
| DEVICE ptr_dev = { | |
| "PTR", &ptr_unit, ptr_reg, ptr_mod, | |
| 1, 10, 31, 1, 8, 8, | |
| NULL, NULL, &ptr_reset, | |
| &ptr_boot, &ptr_attach, &ptr_detach, | |
| &ptr_dib, 0 | |
| }; | |
| /* PTP data structures | |
| ptp_dev PTP device descriptor | |
| ptp_unit PTP unit | |
| ptp_reg PTP register list | |
| */ | |
| DIB ptp_dib = { DEV_PTP, 1, &ptp_iors, { &ptp } }; | |
| UNIT ptp_unit = { | |
| UDATA (&ptp_svc, UNIT_SEQ+UNIT_ATTABLE, 0), SERIAL_OUT_WAIT | |
| }; | |
| REG ptp_reg[] = { | |
| { ORDATA (BUF, ptp_unit.buf, 8) }, | |
| { FLDATA (INT, int_hwre[API_PTP], INT_V_PTP) }, | |
| { FLDATA (DONE, int_hwre[API_PTP], INT_V_PTP) }, | |
| #if defined (IOS_PTPERR) | |
| { FLDATA (ERR, ptp_err, 0) }, | |
| #endif | |
| { DRDATA (POS, ptp_unit.pos, T_ADDR_W), PV_LEFT }, | |
| { DRDATA (TIME, ptp_unit.wait, 24), PV_LEFT }, | |
| { FLDATA (STOP_IOE, ptp_stopioe, 0) }, | |
| { NULL } | |
| }; | |
| MTAB ptp_mod[] = { | |
| { UNIT_PASCII, UNIT_PASCII, "7b ASCII", NULL }, | |
| { MTAB_XTD|MTAB_VDV, 0, "DEVNO", NULL, NULL, &show_devno }, | |
| { 0 } | |
| }; | |
| DEVICE ptp_dev = { | |
| "PTP", &ptp_unit, ptp_reg, ptp_mod, | |
| 1, 10, 31, 1, 8, 8, | |
| NULL, NULL, &ptp_reset, | |
| NULL, &ptp_attach, &ptp_detach, | |
| &ptp_dib, 0 | |
| }; | |
| /* TTI data structures | |
| tti_dev TTI device descriptor | |
| tti_unit TTI unit | |
| tti_reg TTI register list | |
| */ | |
| #if defined (KSR28) | |
| #define TTI_WIDTH 5 | |
| #define TTI_FIGURES (1 << TTI_WIDTH) | |
| #define TTI_BOTH (1 << (TTI_WIDTH + 1)) | |
| #define BAUDOT_LETTERS 037 | |
| #define BAUDOT_FIGURES 033 | |
| #else | |
| #define TTI_WIDTH 8 | |
| #endif | |
| #define TTI_MASK ((1 << TTI_WIDTH) - 1) | |
| #define TTUF_V_HDX (TTUF_V_UF + 0) /* half duplex */ | |
| #define TTUF_HDX (1 << TTUF_V_HDX) | |
| DIB tti_dib = { DEV_TTI, 1, &tti_iors, { &tti } }; | |
| UNIT tti_unit = { UDATA (&tti_svc, UNIT_IDLE+TT_MODE_KSR+TTUF_HDX, 0), 0 }; | |
| REG tti_reg[] = { | |
| { ORDATA (BUF, tti_unit.buf, TTI_WIDTH) }, | |
| #if defined (KSR28) | |
| { ORDATA (BUF2ND, tti_2nd, TTI_WIDTH), REG_HRO }, | |
| #endif | |
| { FLDATA (INT, int_hwre[API_TTI], INT_V_TTI) }, | |
| { FLDATA (DONE, int_hwre[API_TTI], INT_V_TTI) }, | |
| #if defined (PDP15) | |
| { FLDATA (FDPX, tti_fdpx, 0) }, | |
| #endif | |
| { DRDATA (POS, tti_unit.pos, T_ADDR_W), PV_LEFT }, | |
| { DRDATA (TIME, tti_unit.wait, 24), PV_LEFT }, | |
| { NULL } | |
| }; | |
| MTAB tti_mod[] = { | |
| #if !defined (KSR28) | |
| { TT_MODE, TT_MODE_KSR, "KSR", "KSR", &tty_set_mode }, | |
| { TT_MODE, TT_MODE_7B, "7b", "7B", &tty_set_mode }, | |
| { TT_MODE, TT_MODE_8B, "8b", "8B", &tty_set_mode }, | |
| { TT_MODE, TT_MODE_7P, "7b", NULL, NULL }, | |
| #endif | |
| { TTUF_HDX, 0 , "full duplex", "FDX", NULL }, | |
| { TTUF_HDX, TTUF_HDX, "half duplex", "HDX", NULL }, | |
| { MTAB_XTD|MTAB_VDV, 0, "DEVNO", NULL, NULL, &show_devno, NULL }, | |
| { 0 } | |
| }; | |
| DEVICE tti_dev = { | |
| "TTI", &tti_unit, tti_reg, tti_mod, | |
| 1, 10, 31, 1, 8, 8, | |
| NULL, NULL, &tti_reset, | |
| NULL, NULL, NULL, | |
| &tti_dib, 0 | |
| }; | |
| /* TTO data structures | |
| tto_dev TTO device descriptor | |
| tto_unit TTO unit | |
| tto_reg TTO register list | |
| */ | |
| #if defined (KSR28) | |
| #define TTO_WIDTH 5 | |
| #define TTO_FIGURES (1 << TTO_WIDTH) | |
| #else | |
| #define TTO_WIDTH 8 | |
| #endif | |
| #define TTO_MASK ((1 << TTO_WIDTH) - 1) | |
| DIB tto_dib = { DEV_TTO, 1, &tto_iors, { &tto } }; | |
| UNIT tto_unit = { UDATA (&tto_svc, TT_MODE_KSR, 0), 1000 }; | |
| REG tto_reg[] = { | |
| { ORDATA (BUF, tto_unit.buf, TTO_WIDTH) }, | |
| #if defined (KSR28) | |
| { FLDATA (SHIFT, tty_shift, 0), REG_HRO }, | |
| #endif | |
| { FLDATA (INT, int_hwre[API_TTO], INT_V_TTO) }, | |
| { FLDATA (DONE, int_hwre[API_TTO], INT_V_TTO) }, | |
| { DRDATA (POS, tto_unit.pos, T_ADDR_W), PV_LEFT }, | |
| { DRDATA (TIME, tto_unit.wait, 24), PV_LEFT }, | |
| { NULL } | |
| }; | |
| MTAB tto_mod[] = { | |
| #if !defined (KSR28) | |
| { TT_MODE, TT_MODE_KSR, "KSR", "KSR", &tty_set_mode }, | |
| { TT_MODE, TT_MODE_7B, "7b", "7B", &tty_set_mode }, | |
| { TT_MODE, TT_MODE_8B, "8b", "8B", &tty_set_mode }, | |
| { TT_MODE, TT_MODE_7P, "7p", "7P", &tty_set_mode }, | |
| #endif | |
| { MTAB_XTD|MTAB_VDV, 0, "DEVNO", NULL, NULL, &show_devno }, | |
| { 0 } | |
| }; | |
| DEVICE tto_dev = { | |
| "TTO", &tto_unit, tto_reg, tto_mod, | |
| 1, 10, 31, 1, 8, 8, | |
| NULL, NULL, &tto_reset, | |
| NULL, NULL, NULL, | |
| &tto_dib, 0 | |
| }; | |
| /* Clock: IOT routine */ | |
| int32 clk (int32 dev, int32 pulse, int32 dat) | |
| { | |
| if (pulse & 001) { /* CLSF */ | |
| if (TST_INT (CLK)) | |
| dat = dat | IOT_SKP; | |
| } | |
| if (pulse & 004) { /* CLON/CLOF */ | |
| CLR_INT (CLK); /* clear flag */ | |
| if (pulse & 040) /* CLON */ | |
| clk_state = 1; | |
| else clk_state = 0; /* CLOF */ | |
| } | |
| return dat; | |
| } | |
| /* Unit service */ | |
| t_stat clk_svc (UNIT *uptr) | |
| { | |
| int32 t; | |
| t = sim_rtc_calb (clk_tps); /* calibrate clock */ | |
| tmxr_poll = t; /* set mux poll */ | |
| sim_activate_after (uptr, 1000000/clk_tps); /* reactivate unit */ | |
| #if defined (PDP15) | |
| clk_task_upd (FALSE); /* update task timer */ | |
| #endif | |
| if (clk_state) { /* clock on? */ | |
| M[7] = (M[7] + 1) & DMASK; /* incr counter */ | |
| if (M[7] == 0) /* ovrflo? set flag */ | |
| SET_INT (CLK); | |
| } | |
| return SCPE_OK; | |
| } | |
| #if defined (PDP15) | |
| /* Task timer update (PDP-15 XVM only) | |
| The task timer increments monotonically at 100Khz. Since this can't be | |
| simulated accurately, updates are done by interpolation since the last | |
| reading. The timer is also updated at clock events to keep the cycle | |
| counters from wrapping around more than once between updates. */ | |
| int32 clk_task_upd (t_bool clr) | |
| { | |
| uint32 delta, val, iusec10; | |
| uint32 cur = sim_grtime (); | |
| double usec10; | |
| if (cur > clk_task_last) | |
| delta = cur - clk_task_last; | |
| else delta = clk_task_last - cur; | |
| usec10 = ((((double) delta) * 100000.0) / | |
| (((double) tmxr_poll) * ((double) clk_tps))); | |
| iusec10 = (int32) usec10; | |
| val = (clk_task_timer + iusec10) & DMASK; | |
| if (clr) | |
| clk_task_timer = 0; | |
| else clk_task_timer = val; | |
| clk_task_last = cur; | |
| return ((int32) val); | |
| } | |
| #endif | |
| /* IORS service */ | |
| int32 clk_iors (void) | |
| { | |
| return (TST_INT (CLK)? IOS_CLK: 0); | |
| } | |
| /* Reset routine */ | |
| t_stat clk_reset (DEVICE *dptr) | |
| { | |
| int32 t; | |
| sim_register_clock_unit (&clk_unit); /* declare clock unit */ | |
| CLR_INT (CLK); /* clear flag */ | |
| if (!sim_is_running) { /* RESET (not CAF)? */ | |
| t = sim_rtc_init (clk_unit.wait); /* init calibration */ | |
| tmxr_poll = t; /* set mux poll */ | |
| sim_activate_abs (&clk_unit, t); /* activate unit */ | |
| clk_state = 0; /* clock off */ | |
| clk_task_timer = 0; | |
| clk_task_last = 0; | |
| } | |
| return SCPE_OK; | |
| } | |
| /* Set frequency */ | |
| t_stat clk_set_freq (UNIT *uptr, int32 val, char *cptr, void *desc) | |
| { | |
| if (cptr) | |
| return SCPE_ARG; | |
| if ((val != 50) && (val != 60)) | |
| return SCPE_IERR; | |
| clk_tps = val; | |
| return SCPE_OK; | |
| } | |
| /* Show frequency */ | |
| t_stat clk_show_freq (FILE *st, UNIT *uptr, int32 val, void *desc) | |
| { | |
| fprintf (st, (clk_tps == 50)? "50Hz": "60Hz"); | |
| return SCPE_OK; | |
| } | |
| /* Paper tape reader out-of-tape handling | |
| The PDP-4 and PDP-7 readers behaved like most early DEC readers; when | |
| they ran out of tape, they hung. It was up to the program to sense this | |
| condition by running a timer. | |
| The PDP-9 reader controller synthesized the out of tape condition by | |
| noticing whether there was a transition on the feed hole within a window. | |
| The out-of-tape flag was treated like the reader flag in most cases. | |
| The PDP-15 reader controller received the out-of-tape flag as a static | |
| condition from the reader itself and simply reported it via IORS. */ | |
| /* Paper tape reader: IOT routine */ | |
| int32 ptr (int32 dev, int32 pulse, int32 dat) | |
| { | |
| if (pulse & 001) { /* RSF */ | |
| if (TST_INT (PTR)) | |
| dat = dat | IOT_SKP; | |
| } | |
| if (pulse & 002) { /* RRB, RCF */ | |
| CLR_INT (PTR); /* clear flag */ | |
| dat = dat | ptr_unit.buf; /* return buffer */ | |
| } | |
| if (pulse & 004) { /* RSA, RSB */ | |
| ptr_state = (pulse & 040)? 18: 0; /* set mode */ | |
| CLR_INT (PTR); /* clear flag */ | |
| #if !defined (PDP15) /* except on PDP15 */ | |
| ptr_err = 0; /* clear error */ | |
| #endif | |
| ptr_unit.buf = 0; /* clear buffer */ | |
| sim_activate (&ptr_unit, ptr_unit.wait); | |
| } | |
| return dat; | |
| } | |
| /* Unit service */ | |
| t_stat ptr_svc (UNIT *uptr) | |
| { | |
| int32 temp; | |
| if ((ptr_unit.flags & UNIT_ATT) == 0) { /* attached? */ | |
| #if defined (IOS_PTRERR) | |
| SET_INT (PTR); /* if err, set flag */ | |
| ptr_err = 1; /* set error */ | |
| #endif | |
| return IORETURN (ptr_stopioe, SCPE_UNATT); | |
| } | |
| if ((temp = getc (ptr_unit.fileref)) == EOF) { /* end of file? */ | |
| #if defined (IOS_PTRERR) | |
| SET_INT (PTR); /* if err, set flag */ | |
| ptr_err = 1; /* set error */ | |
| #endif | |
| if (feof (ptr_unit.fileref)) { | |
| if (ptr_stopioe) | |
| sim_printf ("PTR end of file\n"); | |
| else return SCPE_OK; | |
| } | |
| else sim_perror ("PTR I/O error"); | |
| clearerr (ptr_unit.fileref); | |
| return SCPE_IOERR; | |
| } | |
| if (ptr_state == 0) { /* ASCII */ | |
| if (ptr_unit.flags & UNIT_RASCII) { /* want parity? */ | |
| ptr_unit.buf = temp = temp & 0177; /* parity off */ | |
| while ((temp = temp & (temp - 1))) | |
| ptr_unit.buf = ptr_unit.buf ^ 0200; /* count bits */ | |
| ptr_unit.buf = ptr_unit.buf ^ 0200; /* set even parity */ | |
| } | |
| else if (ptr_unit.flags & UNIT_KASCII) /* KSR ASCII? */ | |
| ptr_unit.buf = (temp | 0200) & 0377; /* forced parity */ | |
| else ptr_unit.buf = temp & 0377; | |
| } | |
| else if (temp & 0200) { /* binary */ | |
| ptr_state = ptr_state - 6; | |
| ptr_unit.buf = ptr_unit.buf | ((temp & 077) << ptr_state); | |
| } | |
| if (ptr_state == 0) /* if done, set flag */ | |
| SET_INT (PTR); | |
| else sim_activate (&ptr_unit, ptr_unit.wait); /* else restart */ | |
| ptr_unit.pos = ptr_unit.pos + 1; | |
| return SCPE_OK; | |
| } | |
| /* Reset routine */ | |
| t_stat ptr_reset (DEVICE *dptr) | |
| { | |
| ptr_state = 0; /* clear state */ | |
| ptr_unit.buf = 0; | |
| CLR_INT (PTR); /* clear flag */ | |
| #if defined (PDP15) /* PDP15, static err */ | |
| if (((ptr_unit.flags & UNIT_ATT) == 0) || feof (ptr_unit.fileref)) | |
| ptr_err = 1; | |
| else | |
| #endif | |
| ptr_err = 0; /* all other, clr err */ | |
| sim_cancel (&ptr_unit); /* deactivate unit */ | |
| return SCPE_OK; | |
| } | |
| /* IORS service */ | |
| int32 ptr_iors (void) | |
| { | |
| return ((TST_INT (PTR)? IOS_PTR: 0) | |
| #if defined (IOS_PTRERR) | |
| | (ptr_err? IOS_PTRERR: 0) | |
| #endif | |
| ); | |
| } | |
| /* Attach routine */ | |
| t_stat ptr_attach (UNIT *uptr, char *cptr) | |
| { | |
| t_stat reason; | |
| reason = attach_unit (uptr, cptr); | |
| if (reason != SCPE_OK) | |
| return reason; | |
| ptr_err = 0; /* attach clrs error */ | |
| ptr_unit.flags = ptr_unit.flags & ~(UNIT_RASCII|UNIT_KASCII); | |
| if (sim_switches & SWMASK ('A')) | |
| ptr_unit.flags = ptr_unit.flags | UNIT_RASCII; | |
| if (sim_switches & SWMASK ('K')) | |
| ptr_unit.flags = ptr_unit.flags | UNIT_KASCII; | |
| return SCPE_OK; | |
| } | |
| /* Detach routine */ | |
| t_stat ptr_detach (UNIT *uptr) | |
| { | |
| #if defined (PDP15) | |
| ptr_err = 1; | |
| #endif | |
| ptr_unit.flags = ptr_unit.flags & ~UNIT_RASCII; | |
| return detach_unit (uptr); | |
| } | |
| /* Hardware RIM loader routines, PDP-7/9/15 */ | |
| int32 ptr_getw (UNIT *uptr, int32 *hi) | |
| { | |
| int32 word, bits, st, ch; | |
| word = st = bits = 0; | |
| do { | |
| if ((ch = getc (uptr->fileref)) == EOF) | |
| return -1; | |
| uptr->pos = uptr->pos + 1; | |
| if (ch & 0200) { | |
| word = (word << 6) | (ch & 077); | |
| bits = (bits << 1) | ((ch >> 6) & 1); | |
| st++; | |
| } | |
| } while (st < 3); | |
| if (hi != NULL) | |
| *hi = bits; | |
| return word; | |
| } | |
| t_stat ptr_rim_load (UNIT *uptr, int32 origin) | |
| { | |
| int32 bits, val; | |
| for (;;) { /* word loop */ | |
| if ((val = ptr_getw (uptr, &bits)) < 0) | |
| return SCPE_FMT; | |
| if (bits & 1) { /* end of tape? */ | |
| if ((val & 0760000) == OP_JMP) { | |
| PC = ((origin - 1) & 060000) | (val & 017777); | |
| return SCPE_OK; | |
| } | |
| else if (val == OP_HLT) | |
| return STOP_HALT; | |
| break; | |
| } | |
| else if (MEM_ADDR_OK (origin)) | |
| M[origin++] = val; | |
| } | |
| return SCPE_FMT; | |
| } | |
| #if defined (PDP4) || defined (PDP7) | |
| /* Bootstrap routine, PDP-4 and PDP-7 | |
| In a 4K system, the boostrap resides at 7762-7776. | |
| In an 8K or greater system, the bootstrap resides at 17762-17776. | |
| Because the program is so small, simple masking can be | |
| used to remove addr<5> for a 4K system. */ | |
| #define BOOT_START 017577 | |
| #define BOOT_FPC 017577 /* funny format loader */ | |
| #define BOOT_RPC 017770 /* RIM loader */ | |
| #define BOOT_LEN (sizeof (boot_rom) / sizeof (int)) | |
| static const int32 boot_rom[] = { | |
| 0700144, /* rsb */ | |
| 0117762, /* ff, jsb r1b */ | |
| 0057666, /* dac done 1 */ | |
| 0117762, /* jms r1b */ | |
| 0057667, /* dac done 2 */ | |
| 0117762, /* jms r1b */ | |
| 0040007, /* dac conend */ | |
| 0057731, /* dac conbeg */ | |
| 0440007, /* isz conend */ | |
| 0117762, /* blk, jms r1b */ | |
| 0057673, /* dac cai */ | |
| 0741100, /* spa */ | |
| 0617665, /* jmp done */ | |
| 0117762, /* jms r1b */ | |
| 0057777, /* dac tem1 */ | |
| 0317673, /* add cai */ | |
| 0057775, /* dac cks */ | |
| 0117713, /* jms r1a */ | |
| 0140010, /* dzm word */ | |
| 0457777, /* cont, isz tem1 */ | |
| 0617632, /* jmp cont1 */ | |
| 0217775, /* lac cks */ | |
| 0740001, /* cma */ | |
| 0740200, /* sza */ | |
| 0740040, /* hlt */ | |
| 0700144, /* rsb */ | |
| 0617610, /* jmp blk */ | |
| 0117713, /* cont1, jms r1a */ | |
| 0057762, /* dac tem2 */ | |
| 0117713, /* jms r1a */ | |
| 0742010, /* rtl */ | |
| 0742010, /* rtl */ | |
| 0742010, /* rtl */ | |
| 0742010, /* rtl */ | |
| 0317762, /* add tem2 */ | |
| 0057762, /* dac tem2 */ | |
| 0117713, /* jms r1a */ | |
| 0742020, /* rtr */ | |
| 0317726, /* add cdsp */ | |
| 0057713, /* dac r1a */ | |
| 0517701, /* and ccma */ | |
| 0740020, /* rar */ | |
| 0317762, /* add tem2 */ | |
| 0437713, /* xct i r1a */ | |
| 0617622, /* jmp cont */ | |
| 0617672, /* dsptch, jmp code0 */ | |
| 0617670, /* jmp code1 */ | |
| 0617700, /* jmp code2 */ | |
| 0617706, /* jmp code3 */ | |
| 0417711, /* xct code4 */ | |
| 0617732, /* jmp const */ | |
| 0740000, /* nop */ | |
| 0740000, /* nop */ | |
| 0740000, /* nop */ | |
| 0200007, /* done, lac conend */ | |
| 0740040, /* xx */ | |
| 0740040, /* xx */ | |
| 0517727, /* code1, and imsk */ | |
| 0337762, /* add i tem2 */ | |
| 0300010, /* code0, add word */ | |
| 0740040, /* cai, xx */ | |
| 0750001, /* clc */ | |
| 0357673, /* tad cai */ | |
| 0057673, /* dac cai */ | |
| 0617621, /* jmp cont-1 */ | |
| 0711101, /* code2, spa cla */ | |
| 0740001, /* ccma, cma */ | |
| 0277762, /* xor i tem2 */ | |
| 0300010, /* add word */ | |
| 0040010, /* code2a, dac word */ | |
| 0617622, /* jmp cont */ | |
| 0057711, /* code3, dac code4 */ | |
| 0217673, /* lac cai */ | |
| 0357701, /* tad ccma */ | |
| 0740040, /* code4, xx */ | |
| 0617622, /* jmp cont */ | |
| 0000000, /* r1a, 0 */ | |
| 0700101, /* rsf */ | |
| 0617714, /* jmp .-1 */ | |
| 0700112, /* rrb */ | |
| 0700104, /* rsa */ | |
| 0057730, /* dac tem */ | |
| 0317775, /* add cks */ | |
| 0057775, /* dac cks */ | |
| 0217730, /* lac tem */ | |
| 0744000, /* cll */ | |
| 0637713, /* jmp i r1a */ | |
| 0017654, /* cdsp, dsptch */ | |
| 0760000, /* imsk, 760000 */ | |
| 0000000, /* tem, 0 */ | |
| 0000000, /* conbeg, 0 */ | |
| 0300010, /* const, add word */ | |
| 0060007, /* dac i conend */ | |
| 0217731, /* lac conbeg */ | |
| 0040010, /* dac index */ | |
| 0220007, /* lac i conend */ | |
| 0560010, /* con1, sad i index */ | |
| 0617752, /* jmp find */ | |
| 0560010, /* sad i index */ | |
| 0617752, /* jmp find */ | |
| 0560010, /* sad i index */ | |
| 0617752, /* jmp find */ | |
| 0560010, /* sad i index */ | |
| 0617752, /* jmp find */ | |
| 0560010, /* sad i index */ | |
| 0617752, /* jmp find */ | |
| 0617737, /* jmp con1 */ | |
| 0200010, /* find, lac index */ | |
| 0540007, /* sad conend */ | |
| 0440007, /* isz conend */ | |
| 0617704, /* jmp code2a */ | |
| 0000000, | |
| 0000000, | |
| 0000000, | |
| 0000000, | |
| 0000000, /* r1b, 0 */ | |
| 0700101, /* rsf */ | |
| 0617763, /* jmp .-1 */ | |
| 0700112, /* rrb */ | |
| 0700144, /* rsb */ | |
| 0637762, /* jmp i r1b */ | |
| 0700144, /* go, rsb */ | |
| 0117762, /* g, jms r1b */ | |
| 0057775, /* dac cks */ | |
| 0417775, /* xct cks */ | |
| 0117762, /* jms r1b */ | |
| 0000000, /* cks, 0 */ | |
| 0617771 /* jmp g */ | |
| }; | |
| t_stat ptr_boot (int32 unitno, DEVICE *dptr) | |
| { | |
| size_t i; | |
| int32 mask, wd; | |
| #if defined (PDP7) | |
| if (sim_switches & SWMASK ('H')) /* hardware RIM load? */ | |
| return ptr_rim_load (&ptr_unit, ASW); | |
| #endif | |
| if (ptr_dib.dev != DEV_PTR) /* non-std addr? */ | |
| return STOP_NONSTD; | |
| if (MEMSIZE < 8192) /* 4k? */ | |
| mask = 0767777; | |
| else mask = 0777777; | |
| for (i = 0; i < BOOT_LEN; i++) { | |
| wd = boot_rom[i]; | |
| if ((wd >= 0040000) && (wd < 0640000)) | |
| wd = wd & mask; | |
| M[(BOOT_START & mask) + i] = wd; | |
| } | |
| PC = ((sim_switches & SWMASK ('F'))? BOOT_FPC: BOOT_RPC) & mask; | |
| return SCPE_OK; | |
| } | |
| #else | |
| /* PDP-9 and PDP-15 have built-in hardware RIM loaders */ | |
| t_stat ptr_boot (int32 unitno, DEVICE *dptr) | |
| { | |
| return ptr_rim_load (&ptr_unit, ASW); | |
| } | |
| #endif | |
| /* Paper tape punch: IOT routine */ | |
| int32 ptp (int32 dev, int32 pulse, int32 dat) | |
| { | |
| if (pulse & 001) { /* PSF */ | |
| if (TST_INT (PTP)) | |
| dat = dat | IOT_SKP; | |
| } | |
| if (pulse & 002) /* PCF */ | |
| CLR_INT (PTP); | |
| if (pulse & 004) { /* PSA, PSB, PLS */ | |
| CLR_INT (PTP); /* clear flag */ | |
| ptp_unit.buf = (pulse & 040)? /* load punch buf */ | |
| (dat & 077) | 0200: dat & 0377; /* bin or alpha */ | |
| sim_activate (&ptp_unit, ptp_unit.wait); /* activate unit */ | |
| } | |
| return dat; | |
| } | |
| /* Unit service */ | |
| t_stat ptp_svc (UNIT *uptr) | |
| { | |
| SET_INT (PTP); /* set flag */ | |
| if ((ptp_unit.flags & UNIT_ATT) == 0) { /* not attached? */ | |
| ptp_err = 1; /* set error */ | |
| return IORETURN (ptp_stopioe, SCPE_UNATT); | |
| } | |
| if (ptp_unit.flags & UNIT_PASCII) { /* ASCII mode? */ | |
| ptp_unit.buf = ptp_unit.buf & 0177; /* force 7b */ | |
| if ((ptp_unit.buf == 0) || (ptp_unit.buf == 0177)) | |
| return SCPE_OK; /* skip null, del */ | |
| } | |
| if (putc (ptp_unit.buf, ptp_unit.fileref) == EOF) { /* I/O error? */ | |
| ptp_err = 1; /* set error */ | |
| sim_perror ("PTP I/O error"); | |
| clearerr (ptp_unit.fileref); | |
| return SCPE_IOERR; | |
| } | |
| ptp_unit.pos = ptp_unit.pos + 1; | |
| return SCPE_OK; | |
| } | |
| /* IORS service */ | |
| int32 ptp_iors (void) | |
| { | |
| return ((TST_INT (PTP)? IOS_PTP: 0) | |
| #if defined (IOS_PTPERR) | |
| | (ptp_err? IOS_PTPERR: 0) | |
| #endif | |
| ); | |
| } | |
| /* Reset routine */ | |
| t_stat ptp_reset (DEVICE *dptr) | |
| { | |
| ptp_unit.buf = 0; | |
| CLR_INT (PTP); /* clear flag */ | |
| ptp_err = (ptp_unit.flags & UNIT_ATT)? 0: 1; | |
| sim_cancel (&ptp_unit); /* deactivate unit */ | |
| return SCPE_OK; | |
| } | |
| /* Attach routine */ | |
| t_stat ptp_attach (UNIT *uptr, char *cptr) | |
| { | |
| t_stat reason; | |
| reason = attach_unit (uptr, cptr); | |
| if (reason != SCPE_OK) | |
| return reason; | |
| ptp_err = 0; | |
| ptp_unit.flags = ptp_unit.flags & ~UNIT_PASCII; | |
| if (sim_switches & SWMASK ('A')) | |
| ptp_unit.flags = ptp_unit.flags | UNIT_PASCII; | |
| return reason; | |
| } | |
| /* Detach routine */ | |
| t_stat ptp_detach (UNIT *uptr) | |
| { | |
| ptp_err = 1; | |
| ptp_unit.flags = ptp_unit.flags & ~UNIT_PASCII; | |
| return detach_unit (uptr); | |
| } | |
| /* Terminal input: IOT routine */ | |
| int32 tti (int32 dev, int32 pulse, int32 dat) | |
| { | |
| if (pulse & 001) { /* KSF */ | |
| if (TST_INT (TTI)) | |
| dat = dat | IOT_SKP; | |
| } | |
| if (pulse & 002) { /* KRS/KRB */ | |
| CLR_INT (TTI); /* clear flag */ | |
| dat = dat | (tti_unit.buf & TTI_MASK); /* return buffer */ | |
| #if defined (PDP15) | |
| if (pulse & 020) /* KRS? */ | |
| tti_fdpx = 1; | |
| else tti_fdpx = 0; /* no, KRB */ | |
| #endif | |
| } | |
| if (pulse & 004) { /* IORS */ | |
| dat = dat | upd_iors (); | |
| } | |
| return dat; | |
| } | |
| /* Unit service */ | |
| t_stat tti_svc (UNIT *uptr) | |
| { | |
| #if defined (KSR28) /* Baudot... */ | |
| int32 in, c, out; | |
| sim_clock_coschedule (uptr, tmxr_poll); /* continue poll */ | |
| if (tti_2nd) { /* char waiting? */ | |
| uptr->buf = tti_2nd; /* return char */ | |
| tti_2nd = 0; /* not waiting */ | |
| } | |
| else { | |
| if ((in = sim_poll_kbd ()) < SCPE_KFLAG) | |
| return in; | |
| c = asc_to_baud[in & 0177]; /* translate char */ | |
| if (c == 0) /* untranslatable? */ | |
| return SCPE_OK; | |
| if ((c & TTI_BOTH) || /* case insensitive? */ | |
| (((c & TTI_FIGURES)? 1: 0) == tty_shift)) /* right case? */ | |
| uptr->buf = c & TTI_MASK; | |
| else { /* send case change */ | |
| if (c & TTI_FIGURES) { /* to figures? */ | |
| uptr->buf = BAUDOT_FIGURES; | |
| tty_shift = 1; | |
| } | |
| else { /* no, to letters */ | |
| uptr->buf = BAUDOT_LETTERS; | |
| tty_shift = 0; | |
| } | |
| tti_2nd = c & TTI_MASK; /* save actual char */ | |
| } | |
| if ((uptr->flags & TTUF_HDX) && /* half duplex? */ | |
| ((out = sim_tt_outcvt (in, TT_GET_MODE (uptr->flags) | TTUF_KSR)) >= 0)) { | |
| sim_putchar (out); | |
| tto_unit.pos = tto_unit.pos + 1; | |
| } | |
| } | |
| #else /* ASCII... */ | |
| int32 c, out; | |
| sim_clock_coschedule (uptr, tmxr_poll); /* continue poll */ | |
| if ((c = sim_poll_kbd ()) < SCPE_KFLAG) /* no char or error? */ | |
| return c; | |
| out = c & 0177; /* mask echo to 7b */ | |
| if (c & SCPE_BREAK) /* break? */ | |
| c = 0; | |
| else c = sim_tt_inpcvt (c, TT_GET_MODE (uptr->flags) | TTUF_KSR); | |
| if ((uptr->flags & TTUF_HDX) && !tti_fdpx && out && /* half duplex and */ | |
| ((out = sim_tt_outcvt (out, TT_GET_MODE (uptr->flags) | TTUF_KSR)) >= 0)) { | |
| sim_putchar (out); /* echo */ | |
| tto_unit.pos = tto_unit.pos + 1; | |
| } | |
| uptr->buf = c; /* got char */ | |
| #endif | |
| uptr->pos = uptr->pos + 1; | |
| SET_INT (TTI); /* set flag */ | |
| return SCPE_OK; | |
| } | |
| /* IORS service */ | |
| int32 tti_iors (void) | |
| { | |
| return (TST_INT (TTI)? IOS_TTI: 0); | |
| } | |
| /* Reset routine */ | |
| t_stat tti_reset (DEVICE *dptr) | |
| { | |
| tmxr_set_console_units (&tti_unit, &tto_unit); | |
| CLR_INT (TTI); /* clear flag */ | |
| if (!sim_is_running) { /* RESET (not CAF)? */ | |
| tti_unit.buf = 0; /* clear buffer */ | |
| tti_2nd = 0; | |
| tty_shift = 0; /* clear state */ | |
| tti_fdpx = 0; /* clear dpx mode */ | |
| } | |
| sim_activate (&tti_unit, KBD_WAIT (tti_unit.wait, tmxr_poll)); | |
| return SCPE_OK; | |
| } | |
| /* Terminal output: IOT routine */ | |
| int32 tto (int32 dev, int32 pulse, int32 dat) | |
| { | |
| if (pulse & 001) { /* TSF */ | |
| if (TST_INT (TTO)) | |
| dat = dat | IOT_SKP; | |
| } | |
| if (pulse & 002) /* clear flag */ | |
| CLR_INT (TTO); | |
| if (pulse & 004) { /* load buffer */ | |
| sim_activate (&tto_unit, tto_unit.wait); /* activate unit */ | |
| tto_unit.buf = dat & TTO_MASK; /* load buffer */ | |
| } | |
| return dat; | |
| } | |
| /* Unit service */ | |
| t_stat tto_svc (UNIT *uptr) | |
| { | |
| int32 c; | |
| t_stat r; | |
| #if defined (KSR28) /* Baudot... */ | |
| if (uptr->buf == BAUDOT_FIGURES) /* set figures? */ | |
| tty_shift = 1; | |
| else if (uptr->buf == BAUDOT_LETTERS) /* set letters? */ | |
| tty_shift = 0; | |
| else { | |
| c = baud_to_asc[uptr->buf | (tty_shift << 5)]; /* translate */ | |
| #else | |
| c = sim_tt_outcvt (uptr->buf, TT_GET_MODE (uptr->flags) | TTUF_KSR); | |
| if (c >= 0) { | |
| #endif | |
| if ((r = sim_putchar_s (c)) != SCPE_OK) { /* output; error? */ | |
| sim_activate (uptr, uptr->wait); /* retry? */ | |
| return ((r == SCPE_STALL)? SCPE_OK: r); | |
| } | |
| } | |
| SET_INT (TTO); /* set flag */ | |
| uptr->pos = uptr->pos + 1; | |
| return SCPE_OK; | |
| } | |
| /* IORS service */ | |
| int32 tto_iors (void) | |
| { | |
| return (TST_INT (TTO)? IOS_TTO: 0); | |
| } | |
| /* Reset routine */ | |
| t_stat tto_reset (DEVICE *dptr) | |
| { | |
| tto_unit.buf = 0; /* clear buffer */ | |
| tty_shift = 0; /* clear state */ | |
| CLR_INT (TTO); /* clear flag */ | |
| sim_cancel (&tto_unit); /* deactivate unit */ | |
| return SCPE_OK; | |
| } | |
| /* Set mode */ | |
| t_stat tty_set_mode (UNIT *uptr, int32 val, char *cptr, void *desc) | |
| { | |
| tti_unit.flags = (tti_unit.flags & ~TT_MODE) | val; | |
| tto_unit.flags = (tto_unit.flags & ~TT_MODE) | val; | |
| return SCPE_OK; | |
| } |