PDP8/pdp8_lp.c

   1 /* pdp8_lp.c: PDP-8 line printer 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    lpt          LP8E line printer
  27
  28    19-Jan-07    RMS     Added UNIT_TEXT
  29    25-Apr-03    RMS     Revised for extended file support
  30    04-Oct-02    RMS     Added DIB, enable/disable, device number support
  31    30-May-02    RMS     Widened POS to 32b
  32 */
  33
  34 #include "pdp8_defs.h"
  35
  36 extern int32 int_req, int_enable, dev_done, stop_inst;
  37
  38 int32 lpt_err = 0;                                      /* error flag */
  39 int32 lpt_stopioe = 0;                                  /* stop on error */
  40
  41 DEVICE lpt_dev;
  42 int32 lpt (int32 IR, int32 AC);
  43 t_stat lpt_svc (UNIT *uptr);
  44 t_stat lpt_reset (DEVICE *dptr);
  45 t_stat lpt_attach (UNIT *uptr, char *cptr);
  46 t_stat lpt_detach (UNIT *uptr);
  47
  48 /* LPT data structures
  49
  50    lpt_dev      LPT device descriptor
  51    lpt_unit     LPT unit descriptor
  52    lpt_reg      LPT register list
  53 */
  54
  55 DIB lpt_dib = { DEV_LPT, 1, { &lpt } };
  56
  57 UNIT lpt_unit = {
  58     UDATA (&lpt_svc, UNIT_SEQ+UNIT_ATTABLE+UNIT_TEXT, 0), SERIAL_OUT_WAIT
  59     };
  60
  61 REG lpt_reg[] = {
  62     { ORDATA (BUF, lpt_unit.buf, 8) },
  63     { FLDATA (ERR, lpt_err, 0) },
  64     { FLDATA (DONE, dev_done, INT_V_LPT) },
  65     { FLDATA (ENABLE, int_enable, INT_V_LPT) },
  66     { FLDATA (INT, int_req, INT_V_LPT) },
  67     { DRDATA (POS, lpt_unit.pos, T_ADDR_W), PV_LEFT },
  68     { DRDATA (TIME, lpt_unit.wait, 24), PV_LEFT },
  69     { FLDATA (STOP_IOE, lpt_stopioe, 0) },
  70     { ORDATA (DEVNUM, lpt_dib.dev, 6), REG_HRO },
  71     { NULL }
  72     };
  73
  74 MTAB lpt_mod[] = {
  75     { MTAB_XTD|MTAB_VDV, 0, "DEVNO", "DEVNO",
  76       &set_dev, &show_dev, NULL },
  77     { 0 }
  78     };
  79
  80 DEVICE lpt_dev = {
  81     "LPT", &lpt_unit, lpt_reg, lpt_mod,
  82     1, 10, 31, 1, 8, 8,
  83     NULL, NULL, &lpt_reset,
  84     NULL, &lpt_attach, &lpt_detach,
  85     &lpt_dib, DEV_DISABLE
  86     };
  87
  88 /* IOT routine */
  89
  90 int32 lpt (int32 IR, int32 AC)
  91 {
  92 switch (IR & 07) {                                      /* decode IR<9:11> */
  93
  94     case 1:                                             /* PSKF */
  95         return (dev_done & INT_LPT)? IOT_SKP + AC: AC;
  96
  97     case 2:                                             /* PCLF */
  98         dev_done = dev_done & ~INT_LPT;                 /* clear flag */
  99         int_req = int_req & ~INT_LPT;                   /* clear int req */
 100         return AC;
 101
 102     case 3:                                             /* PSKE */
 103         return (lpt_err)? IOT_SKP + AC: AC;
 104
 105     case 6:                                             /* PCLF!PSTB */
 106         dev_done = dev_done & ~INT_LPT;                 /* clear flag */
 107         int_req = int_req & ~INT_LPT;                   /* clear int req */
 108
 109     case 4:                                             /* PSTB */
 110         lpt_unit.buf = AC & 0177;                       /* load buffer */
 111         if ((lpt_unit.buf == 015) || (lpt_unit.buf == 014) ||
 112             (lpt_unit.buf == 012)) {
 113             sim_activate (&lpt_unit, lpt_unit.wait);
 114             return AC;
 115             }
 116         return (lpt_svc (&lpt_unit) << IOT_V_REASON) + AC;
 117
 118     case 5:                                             /* PSIE */
 119         int_enable = int_enable | INT_LPT;              /* set enable */
 120         int_req = INT_UPDATE;                           /* update interrupts */
 121         return AC;
 122
 123     case 7:                                             /* PCIE */
 124         int_enable = int_enable & ~INT_LPT;             /* clear enable */
 125         int_req = int_req & ~INT_LPT;                   /* clear int req */
 126         return AC;
 127
 128     default:
 129         return (stop_inst << IOT_V_REASON) + AC;
 130         }                                               /* end switch */
 131 }
 132
 133 /* Unit service */
 134
 135 t_stat lpt_svc (UNIT *uptr)
 136 {
 137 dev_done = dev_done | INT_LPT;                          /* set done */
 138 int_req = INT_UPDATE;                                   /* update interrupts */
 139 if ((uptr->flags & UNIT_ATT) == 0) {
 140     lpt_err = 1;
 141     return IORETURN (lpt_stopioe, SCPE_UNATT);
 142     }
 143 fputc (uptr->buf, uptr->fileref);                       /* print char */
 144 uptr->pos = ftell (uptr->fileref);
 145 if (ferror (uptr->fileref)) {                           /* error? */
 146     perror ("LPT I/O error");
 147     clearerr (uptr->fileref);
 148     return SCPE_IOERR;
 149     }
 150 return SCPE_OK;
 151 }
 152
 153 /* Reset routine */
 154
 155 t_stat lpt_reset (DEVICE *dptr)
 156 {
 157 lpt_unit.buf = 0;
 158 dev_done = dev_done & ~INT_LPT;                         /* clear done, int */
 159 int_req = int_req & ~INT_LPT;
 160 int_enable = int_enable | INT_LPT;                      /* set enable */
 161 lpt_err = (lpt_unit.flags & UNIT_ATT) == 0;
 162 sim_cancel (&lpt_unit);                                 /* deactivate unit */
 163 return SCPE_OK;
 164 }
 165
 166 /* Attach routine */
 167
 168 t_stat lpt_attach (UNIT *uptr, char *cptr)
 169 {
 170 t_stat reason;
 171
 172 reason = attach_unit (uptr, cptr);
 173 lpt_err = (lpt_unit.flags & UNIT_ATT) == 0;
 174 return reason;
 175 }
 176
 177 /* Detach routine */
 178
 179 t_stat lpt_detach (UNIT *uptr)
 180 {
 181 lpt_err = 1;
 182 return detach_unit (uptr);
 183 }