PDP8/pdp8_tt.c

   1 /* pdp8_tt.c: PDP-8 console terminal simulator
   2
   3    Copyright (c) 1993-2007, Robert M Supnik
   4
   5    Permission is hereby granted, free of charge, to any person obtaining a
   6    copy of this software and associated documentation files (the "Software"),
   7    to deal in the Software without restriction, including without limitation
   8    the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9    and/or sell copies of the Software, and to permit persons to whom the
  10    Software is furnished to do so, subject to the following conditions:
  11
  12    The above copyright notice and this permission notice shall be included in
  13    all copies or substantial portions of the Software.
  14
  15    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18    ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  19    IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  20    CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  21
  22    Except as contained in this notice, the name of Robert M Supnik shall not be
  23    used in advertising or otherwise to promote the sale, use or other dealings
  24    in this Software without prior written authorization from Robert M Supnik.
  25
  26    tti,tto      KL8E terminal input/output
  27
  28    18-Jun-07    RMS     Added UNIT_IDLE flag to console input
  29    18-Oct-06    RMS     Synced keyboard to clock
  30    30-Sep-06    RMS     Fixed handling of non-printable characters in KSR mode
  31    22-Nov-05    RMS     Revised for new terminal processing routines
  32    28-May-04    RMS     Removed SET TTI CTRL-C
  33    29-Dec-03    RMS     Added console output backpressure support
  34    25-Apr-03    RMS     Revised for extended file support
  35    02-Mar-02    RMS     Added SET TTI CTRL-C
  36    22-Dec-02    RMS     Added break support
  37    01-Nov-02    RMS     Added 7B/8B support
  38    04-Oct-02    RMS     Added DIBs, device number support
  39    30-May-02    RMS     Widened POS to 32b
  40    07-Sep-01    RMS     Moved function prototypes
  41 */
  42
  43 #include "pdp8_defs.h"
  44 #include <ctype.h>
  45
  46 extern int32 int_req, int_enable, dev_done, stop_inst;
  47 extern int32 tmxr_poll;
  48
  49 int32 tti (int32 IR, int32 AC);
  50 int32 tto (int32 IR, int32 AC);
  51 t_stat tti_svc (UNIT *uptr);
  52 t_stat tto_svc (UNIT *uptr);
  53 t_stat tti_reset (DEVICE *dptr);
  54 t_stat tto_reset (DEVICE *dptr);
  55 t_stat tty_set_mode (UNIT *uptr, int32 val, char *cptr, void *desc);
  56
  57 /* TTI data structures
  58
  59    tti_dev      TTI device descriptor
  60    tti_unit     TTI unit descriptor
  61    tti_reg      TTI register list
  62    tti_mod      TTI modifiers list
  63 */
  64
  65 DIB tti_dib = { DEV_TTI, 1, { &tti } };
  66
  67 UNIT tti_unit = { UDATA (&tti_svc, UNIT_IDLE|TT_MODE_KSR, 0), 0 };
  68
  69 REG tti_reg[] = {
  70     { ORDATA (BUF, tti_unit.buf, 8) },
  71     { FLDATA (DONE, dev_done, INT_V_TTI) },
  72     { FLDATA (ENABLE, int_enable, INT_V_TTI) },
  73     { FLDATA (INT, int_req, INT_V_TTI) },
  74     { DRDATA (POS, tti_unit.pos, T_ADDR_W), PV_LEFT },
  75     { DRDATA (TIME, tti_unit.wait, 24), PV_LEFT },
  76     { NULL }
  77     };
  78
  79 MTAB tti_mod[] = {
  80     { TT_MODE, TT_MODE_KSR, "KSR", "KSR", &tty_set_mode },
  81     { TT_MODE, TT_MODE_7B,  "7b",  "7B",  &tty_set_mode },
  82     { TT_MODE, TT_MODE_8B,  "8b",  "8B",  &tty_set_mode },
  83     { TT_MODE, TT_MODE_7P,  "7b",  NULL,  NULL },
  84     { MTAB_XTD|MTAB_VDV, 0, "DEVNO", NULL, NULL, &show_dev, NULL },
  85     { 0 }
  86     };
  87
  88 DEVICE tti_dev = {
  89     "TTI", &tti_unit, tti_reg, tti_mod,
  90     1, 10, 31, 1, 8, 8,
  91     NULL, NULL, &tti_reset,
  92     NULL, NULL, NULL,
  93     &tti_dib, 0
  94     };
  95
  96 /* TTO data structures
  97
  98    tto_dev      TTO device descriptor
  99    tto_unit     TTO unit descriptor
 100    tto_reg      TTO register list
 101 */
 102
 103 DIB tto_dib = { DEV_TTO, 1, { &tto } };
 104
 105 UNIT tto_unit = { UDATA (&tto_svc, TT_MODE_KSR, 0), SERIAL_OUT_WAIT };
 106
 107 REG tto_reg[] = {
 108     { ORDATA (BUF, tto_unit.buf, 8) },
 109     { FLDATA (DONE, dev_done, INT_V_TTO) },
 110     { FLDATA (ENABLE, int_enable, INT_V_TTO) },
 111     { FLDATA (INT, int_req, INT_V_TTO) },
 112     { DRDATA (POS, tto_unit.pos, T_ADDR_W), PV_LEFT },
 113     { DRDATA (TIME, tto_unit.wait, 24), PV_LEFT },
 114     { NULL }
 115     };
 116
 117 MTAB tto_mod[] = {
 118     { TT_MODE, TT_MODE_KSR, "KSR", "KSR", &tty_set_mode },
 119     { TT_MODE, TT_MODE_7B,  "7b",  "7B",  &tty_set_mode },
 120     { TT_MODE, TT_MODE_8B,  "8b",  "8B",  &tty_set_mode },
 121     { TT_MODE, TT_MODE_7P,  "7p",  "7P",  &tty_set_mode },
 122     { MTAB_XTD|MTAB_VDV, 0, "DEVNO", NULL, NULL, &show_dev },
 123     { 0 }
 124     };
 125
 126 DEVICE tto_dev = {
 127     "TTO", &tto_unit, tto_reg, tto_mod,
 128     1, 10, 31, 1, 8, 8,
 129     NULL, NULL, &tto_reset,
 130     NULL, NULL, NULL,
 131     &tto_dib, 0
 132     };
 133
 134 /* Terminal input: IOT routine */
 135
 136 int32 tti (int32 IR, int32 AC)
 137 {
 138 switch (IR & 07) {                                      /* decode IR<9:11> */
 139     case 0:                                             /* KCF */
 140         dev_done = dev_done & ~INT_TTI;                 /* clear flag */
 141         int_req = int_req & ~INT_TTI;
 142         return AC;
 143
 144     case 1:                                             /* KSF */
 145         return (dev_done & INT_TTI)? IOT_SKP + AC: AC;
 146
 147     case 2:                                             /* KCC */
 148         dev_done = dev_done & ~INT_TTI;                 /* clear flag */
 149         int_req = int_req & ~INT_TTI;
 150         return 0;                                       /* clear AC */
 151
 152     case 4:                                             /* KRS */
 153         return (AC | tti_unit.buf);                     /* return buffer */
 154
 155     case 5:                                             /* KIE */
 156         if (AC & 1) int_enable = int_enable | (INT_TTI+INT_TTO);
 157         else int_enable = int_enable & ~(INT_TTI+INT_TTO);
 158         int_req = INT_UPDATE;                           /* update interrupts */
 159         return AC;
 160
 161     case 6:                                             /* KRB */
 162         dev_done = dev_done & ~INT_TTI;                 /* clear flag */
 163         int_req = int_req & ~INT_TTI;
 164         return (tti_unit.buf);                          /* return buffer */
 165
 166     default:
 167         return (stop_inst << IOT_V_REASON) + AC;
 168         }                                               /* end switch */
 169 }
 170
 171 /* Unit service */
 172
 173 t_stat tti_svc (UNIT *uptr)
 174 {
 175 int32 c;
 176
 177 sim_activate (uptr, KBD_WAIT (uptr->wait, tmxr_poll));  /* continue poll */
 178 if ((c = sim_poll_kbd ()) < SCPE_KFLAG) return c;       /* no char or error? */
 179 if (c & SCPE_BREAK) uptr->buf = 0;                      /* break? */
 180 else uptr->buf = sim_tt_inpcvt (c, TT_GET_MODE (uptr->flags) | TTUF_KSR);
 181 uptr->pos = uptr->pos + 1;
 182 dev_done = dev_done | INT_TTI;                          /* set done */
 183 int_req = INT_UPDATE;                                   /* update interrupts */
 184 return SCPE_OK;
 185 }
 186
 187 /* Reset routine */
 188
 189 t_stat tti_reset (DEVICE *dptr)
 190 {
 191 tti_unit.buf = 0;
 192 dev_done = dev_done & ~INT_TTI;                         /* clear done, int */
 193 int_req = int_req & ~INT_TTI;
 194 int_enable = int_enable | INT_TTI;                      /* set enable */
 195 sim_activate_abs (&tti_unit, KBD_WAIT (tti_unit.wait, tmxr_poll));
 196 return SCPE_OK;
 197 }
 198
 199 /* Terminal output: IOT routine */
 200
 201 int32 tto (int32 IR, int32 AC)
 202 {
 203 switch (IR & 07) {                                      /* decode IR<9:11> */
 204
 205     case 0:                                             /* TLF */
 206         dev_done = dev_done | INT_TTO;                  /* set flag */
 207         int_req = INT_UPDATE;                           /* update interrupts */
 208         return AC;
 209
 210     case 1:                                             /* TSF */
 211         return (dev_done & INT_TTO)? IOT_SKP + AC: AC;
 212
 213     case 2:                                             /* TCF */
 214         dev_done = dev_done & ~INT_TTO;                 /* clear flag */
 215         int_req = int_req & ~INT_TTO;                   /* clear int req */
 216         return AC;
 217
 218     case 5:                                             /* SPI */
 219         return (int_req & (INT_TTI+INT_TTO))? IOT_SKP + AC: AC;
 220
 221     case 6:                                             /* TLS */
 222         dev_done = dev_done & ~INT_TTO;                 /* clear flag */
 223         int_req = int_req & ~INT_TTO;                   /* clear int req */
 224     case 4:                                             /* TPC */
 225         sim_activate (&tto_unit, tto_unit.wait);        /* activate unit */
 226         tto_unit.buf = AC;                              /* load buffer */
 227         return AC;
 228
 229     default:
 230         return (stop_inst << IOT_V_REASON) + AC;
 231         }                                               /* end switch */
 232 }
 233
 234 /* Unit service */
 235
 236 t_stat tto_svc (UNIT *uptr)
 237 {
 238 int32 c;
 239 t_stat r;
 240
 241 c = sim_tt_outcvt (uptr->buf, TT_GET_MODE (uptr->flags) | TTUF_KSR);
 242 if (c >= 0) {
 243     if ((r = sim_putchar_s (c)) != SCPE_OK) {           /* output char; error? */
 244         sim_activate (uptr, uptr->wait);                /* try again */
 245         return ((r == SCPE_STALL)? SCPE_OK: r);         /* if !stall, report */
 246         }
 247     }
 248 dev_done = dev_done | INT_TTO;                          /* set done */
 249 int_req = INT_UPDATE;                                   /* update interrupts */
 250 uptr->pos = uptr->pos + 1;
 251 return SCPE_OK;
 252 }
 253
 254 /* Reset routine */
 255
 256 t_stat tto_reset (DEVICE *dptr)
 257 {
 258 tto_unit.buf = 0;
 259 dev_done = dev_done & ~INT_TTO;                         /* clear done, int */
 260 int_req = int_req & ~INT_TTO;
 261 int_enable = int_enable | INT_TTO;                      /* set enable */
 262 sim_cancel (&tto_unit);                                 /* deactivate unit */
 263 return SCPE_OK;
 264 }
 265
 266 t_stat tty_set_mode (UNIT *uptr, int32 val, char *cptr, void *desc)
 267 {
 268 tti_unit.flags = (tti_unit.flags & ~TT_MODE) | val;
 269 tto_unit.flags = (tto_unit.flags & ~TT_MODE) | val;
 270 return SCPE_OK;
 271 }