/* pdp8_defs.h: PDP-8 simulator definitions

   Copyright (c) 1993-2005, 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.

   13-Oct-03    RMS     Added TSC8-75 support
   04-Oct-02    RMS     Added variable device number support
   20-Jan-02    RMS     Fixed bug in TTx interrupt enable initialization
   25-Nov-01    RMS     Added RL8A support
   16-Sep-01    RMS     Added multiple KL support
   18-Mar-01    RMS     Added DF32 support
   15-Feb-01    RMS     Added DECtape support
   14-Apr-99    RMS     Changed t_addr to unsigned
   19-Mar-95    RMS     Added dynamic memory size
   02-May-94    RMS     Added non-existent memory handling

   The author gratefully acknowledges the help of Max Burnet, Richie Lary,
   and Bill Haygood in resolving questions about the PDP-8
*/

#ifndef _PDP8_DEFS_H_
#define _PDP8_DEFS_H_   0

#include "sim_defs.h"                                   /* simulator defns */

/* Simulator stop codes */

#define STOP_RSRV       1                               /* must be 1 */
#define STOP_HALT       2                               /* HALT */
#define STOP_IBKPT      3                               /* breakpoint */
#define STOP_NOTSTD     4                               /* non-std devno */
#define STOP_DTOFF      5                               /* DECtape off reel */

/* Memory */

#define MAXMEMSIZE      32768                           /* max memory size */
#define MEMSIZE         (cpu_unit.capac)                /* actual memory size */
#define ADDRMASK        (MAXMEMSIZE - 1)                /* address mask */
#define MEM_ADDR_OK(x)  (((uint32) (x)) < MEMSIZE)

/* IOT subroutine return codes */

#define IOT_V_SKP       12                              /* skip */
#define IOT_V_REASON    13                              /* reason */
#define IOT_SKP         (1 << IOT_V_SKP)
#define IOT_REASON      (1 << IOT_V_REASON)
#define IORETURN(f,v)   ((f)? (v): SCPE_OK)             /* stop on error */

/* Timers */

#define TMR_CLK         0                               /* timer 0 = clock */
#define TMR_TTX         1                               /* timer 1 = TTx */

/* Device information block */

#define DEV_MAXBLK      8                               /* max dev block */
#define DEV_MAX         64                              /* total devices */

typedef struct {
    uint32              dev;                            /* base dev number */
    uint32              num;                            /* number of slots */
    int32               (*dsp[DEV_MAXBLK])(int32 IR, int32 dat);
    } DIB;

/* Standard device numbers */

#define DEV_PTR         001                             /* paper tape reader */
#define DEV_PTP         002                             /* paper tape punch */
#define DEV_TTI         003                             /* console input */
#define DEV_TTO         004                             /* console output */
#define DEV_CLK         013                             /* clock */
#define DEV_TSC         036
#define DEV_KJ8         040                             /* extra terminals */
#define DEV_DF          060                             /* DF32 */
#define DEV_RF          060                             /* RF08 */
#define DEV_RL          060                             /* RL8A */
#define DEV_LPT         066                             /* line printer */
#define DEV_MT          070                             /* TM8E */
#define DEV_RK          074                             /* RK8E */
#define DEV_RX          075                             /* RX8E/RX28 */
#define DEV_DTA         076                             /* TC08 */
#define DEV_TD8E        077                             /* TD8E */

/* Interrupt flags

   The interrupt flags consist of three groups:

   1.   Devices with individual interrupt enables.  These record
        their interrupt requests in device_done and their enables
        in device_enable, and must occupy the low bit positions.

   2.   Devices without interrupt enables.  These record their
        interrupt requests directly in int_req, and must occupy
        the middle bit positions.

   3.   Overhead.  These exist only in int_req and must occupy the
        high bit positions.

   Because the PDP-8 does not have priority interrupts, the order
   of devices within groups does not matter.

   Note: all extra KL input and output interrupts must be assigned
   to contiguous bits.
*/

#define INT_V_START     0                               /* enable start */
#define INT_V_LPT       (INT_V_START+0)                 /* line printer */
#define INT_V_PTP       (INT_V_START+1)                 /* tape punch */
#define INT_V_PTR       (INT_V_START+2)                 /* tape reader */
#define INT_V_TTO       (INT_V_START+3)                 /* terminal */
#define INT_V_TTI       (INT_V_START+4)                 /* keyboard */
#define INT_V_CLK       (INT_V_START+5)                 /* clock */
#define INT_V_TTO1      (INT_V_START+6)                 /* tto1 */
#define INT_V_TTO2      (INT_V_START+7)                 /* tto2 */
#define INT_V_TTO3      (INT_V_START+8)                 /* tto3 */
#define INT_V_TTO4      (INT_V_START+9)                 /* tto4 */
#define INT_V_TTI1      (INT_V_START+10)                /* tti1 */
#define INT_V_TTI2      (INT_V_START+11)                /* tti2 */
#define INT_V_TTI3      (INT_V_START+12)                /* tti3 */
#define INT_V_TTI4      (INT_V_START+13)                /* tti4 */
#define INT_V_DIRECT    (INT_V_START+14)                /* direct start */
#define INT_V_RX        (INT_V_DIRECT+0)                /* RX8E */
#define INT_V_RK        (INT_V_DIRECT+1)                /* RK8E */
#define INT_V_RF        (INT_V_DIRECT+2)                /* RF08 */
#define INT_V_DF        (INT_V_DIRECT+3)                /* DF32 */
#define INT_V_MT        (INT_V_DIRECT+4)                /* TM8E */
#define INT_V_DTA       (INT_V_DIRECT+5)                /* TC08 */
#define INT_V_RL        (INT_V_DIRECT+6)                /* RL8A */
#define INT_V_PWR       (INT_V_DIRECT+7)                /* power int */
#define INT_V_UF        (INT_V_DIRECT+8)                /* user int */
#define INT_V_TSC       (INT_V_DIRECT+9)                /* TSC8-75 int */
#define INT_V_OVHD      (INT_V_DIRECT+10)               /* overhead start */
#define INT_V_NO_ION_PENDING (INT_V_OVHD+0)             /* ion pending */
#define INT_V_NO_CIF_PENDING (INT_V_OVHD+1)             /* cif pending */
#define INT_V_ION       (INT_V_OVHD+2)                  /* interrupts on */

#define INT_LPT         (1 << INT_V_LPT)
#define INT_PTP         (1 << INT_V_PTP)
#define INT_PTR         (1 << INT_V_PTR)
#define INT_TTO         (1 << INT_V_TTO)
#define INT_TTI         (1 << INT_V_TTI)
#define INT_CLK         (1 << INT_V_CLK)
#define INT_TTO1        (1 << INT_V_TTO1)
#define INT_TTO2        (1 << INT_V_TTO2)
#define INT_TTO3        (1 << INT_V_TTO3)
#define INT_TTO4        (1 << INT_V_TTO4)
#define INT_TTI1        (1 << INT_V_TTI1)
#define INT_TTI2        (1 << INT_V_TTI2)
#define INT_TTI3        (1 << INT_V_TTI3)
#define INT_TTI4        (1 << INT_V_TTI4)
#define INT_RX          (1 << INT_V_RX)
#define INT_RK          (1 << INT_V_RK)
#define INT_RF          (1 << INT_V_RF)
#define INT_DF          (1 << INT_V_DF)
#define INT_MT          (1 << INT_V_MT)
#define INT_DTA         (1 << INT_V_DTA)
#define INT_RL          (1 << INT_V_RL)
#define INT_PWR         (1 << INT_V_PWR)
#define INT_UF          (1 << INT_V_UF)
#define INT_TSC         (1 << INT_V_TSC)
#define INT_NO_ION_PENDING (1 << INT_V_NO_ION_PENDING)
#define INT_NO_CIF_PENDING (1 << INT_V_NO_CIF_PENDING)
#define INT_ION         (1 << INT_V_ION)
#define INT_DEV_ENABLE  ((1 << INT_V_DIRECT) - 1)       /* devices w/enables */
#define INT_ALL         ((1 << INT_V_OVHD) - 1)         /* all interrupts */
#define INT_INIT_ENABLE (INT_TTI+INT_TTO+INT_PTR+INT_PTP+INT_LPT) | \
                    (INT_TTI1+INT_TTI2+INT_TTI3+INT_TTI4) | \
                    (INT_TTO1+INT_TTO2+INT_TTO3+INT_TTO4)
#define INT_PENDING     (INT_ION+INT_NO_CIF_PENDING+INT_NO_ION_PENDING)
#define INT_UPDATE      ((int_req & ~INT_DEV_ENABLE) | (dev_done & int_enable))

/* Function prototypes */

t_stat set_dev (UNIT *uptr, int32 val, char *cptr, void *desc);
t_stat show_dev (FILE *st, UNIT *uptr, int32 val, void *desc);

#endif
