First Commit of my working state

[simh.git] / PDP8 / pdp8_tsc.c

/* pdp8_tsc.c: PDP-8 ETOS timesharing option board (TSC8-75)\r
\r
   Copyright (c) 2003-2005, Robert M Supnik\r
\r
   Permission is hereby granted, free of charge, to any person obtaining a\r
   copy of this software and associated documentation files (the "Software"),\r
   to deal in the Software without restriction, including without limitation\r
   the rights to use, copy, modify, merge, publish, distribute, sublicense,\r
   and/or sell copies of the Software, and to permit persons to whom the\r
   Software is furnished to do so, subject to the following conditions:\r
\r
   The above copyright notice and this permission notice shall be included in\r
   all copies or substantial portions of the Software.\r
\r
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL\r
   ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\r
   IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\r
   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r
\r
   Except as contained in this notice, the name of Robert M Supnik shall not be\r
   used in advertising or otherwise to promote the sale, use or other dealings\r
   in this Software without prior written authorization from Robert M Supnik.\r
\r
   This module is based on Bernhard Baehr's PDP-8/E simulator\r
\r
        PDP-8/E Simulator Source Code\r
\r
        Copyright ) 2001-2003 Bernhard Baehr\r
\r
        TSC8iots.c - IOTs for the TSC8-75 Board plugin\r
\r
        This program is free software; you can redistribute it and/or modify\r
        it under the terms of the GNU General Public License as published by\r
        the Free Software Foundation; either version 2 of the License, or\r
        (at your option) any later version.\r
\r
        This program is distributed in the hope that it will be useful,\r
        but WITHOUT ANY WARRANTY; without even the implied warranty of\r
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
        GNU General Public License for more details.\r
\r
        You should have received a copy of the GNU General Public License\r
        along with this program; if not, write to the Free Software\r
        Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
\r
   tsc          TSC8-75 option board\r
*/\r
\r
#include "pdp8_defs.h"\r
\r
extern int32 int_req;\r
extern int32 SF;\r
extern int32 tsc_ir;                                    /* "ERIOT" */\r
extern int32 tsc_pc;                                    /* "ERTB" */\r
extern int32 tsc_cdf;                                   /* "ECDF" */\r
extern int32 tsc_enb;                                   /* enable */\r
\r
#define UNIT_V_SN699    (UNIT_V_UF + 0)                 /* SN 699 or above */\r
#define UNIT_SN699      (1 << UNIT_V_SN699)\r
\r
DEVICE tsc_dev;\r
int32 tsc (int32 IR, int32 AC);\r
t_stat tsc_reset (DEVICE *dptr);\r
\r
/* TSC data structures\r
\r
   tsc_dev      TSC device descriptor\r
   tsc_unit     TSC unit descriptor\r
   tsc_reg      TSC register list\r
*/\r
\r
DIB tsc_dib = { DEV_TSC, 1, { &tsc } };\r
\r
UNIT tsc_unit = { UDATA (NULL, UNIT_SN699, 0) };\r
\r
REG tsc_reg[] = {\r
    { ORDATA (IR, tsc_ir, 12) },\r
    { ORDATA (PC, tsc_pc, 12) },\r
    { FLDATA (CDF, tsc_cdf, 0) },\r
    { FLDATA (ENB, tsc_enb, 0) },\r
    { FLDATA (INT, int_req, INT_V_TSC) },\r
    { NULL }\r
    };\r
\r
MTAB tsc_mod[] = {\r
    { UNIT_SN699, UNIT_SN699, "ESME", "ESME", NULL },\r
    { UNIT_SN699, 0, "no ESME", "NOESME", NULL },\r
    { 0 }\r
    };\r
\r
DEVICE tsc_dev = {\r
    "TSC", &tsc_unit, tsc_reg, tsc_mod,\r
    1, 10, 31, 1, 8, 8,\r
    NULL, NULL, &tsc_reset,\r
    NULL, NULL, NULL,\r
    &tsc_dib, DEV_DISABLE | DEV_DIS\r
    };\r
\r
/* IOT routine */\r
\r
int32 tsc (int32 IR, int32 AC)\r
{\r
switch (IR & 07) {                                      /* decode IR<9:11> */\r
\r
    case 0:                                             /* ETDS */\r
        tsc_enb = 0;                                    /* disable int req */\r
        int_req = int_req & ~INT_TSC;                   /* clear flag */\r
        break;\r
\r
    case 1:                                             /* ESKP */\r
        return (int_req & INT_TSC)? IOT_SKP + AC: AC;   /* skip on int req */\r
\r
    case 2:                                             /* ECTF */\r
        int_req = int_req & ~INT_TSC;                   /* clear int req */\r
        break;\r
\r
    case 3:                                             /* ECDF */\r
        AC = AC | ((tsc_ir >> 3) & 07);                 /* read "ERIOT"<6:8> */\r
        if (tsc_cdf) AC = AC | IOT_SKP;                 /* if cdf, skip */\r
        tsc_cdf = 0;\r
        break;\r
\r
    case 4:                                             /* ERTB */\r
        return tsc_pc;\r
\r
    case 5:                                             /* ESME */\r
        if (tsc_unit.flags & UNIT_SN699) {              /* enabled? */\r
            if (tsc_cdf && ((tsc_ir & 070) >> 3) == (SF & 07)) {\r
                AC = AC | IOT_SKP;\r
                tsc_cdf = 0;\r
                }\r
            }\r
        break;\r
\r
    case 6:                                             /* ERIOT */\r
        return tsc_ir;\r
\r
    case 7:                                             /* ETEN */\r
        tsc_enb = 1;\r
        break;\r
        }                                               /* end switch */\r
\r
return AC;\r
}\r
\r
/* Reset routine */\r
\r
t_stat tsc_reset (DEVICE *dptr)\r
{\r
tsc_ir = 0;\r
tsc_pc = 0;\r
tsc_cdf = 0;\r
tsc_enb = 0;\r
int_req = int_req & ~INT_TSC;\r
return SCPE_OK;\r
}\r