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/* nova_dkp.c: NOVA moving head disk simulator
Copyright (c) 1993-2008, 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.
dkp moving head disk
04-Jul-04 BKR device name changed to DG's DKP from DEC's DP,
DEV_SET/CLR/INTR macro use started,
fixed 'P' pulse code and secret quirks,
added 6097 diag and size support,
fixed losing unit drive type during unit change,
tightened sector size determination calculations,
controller DONE flag handling fixed,
fixed cylinder overflow test error,
seek error code fixed,
restructured dkp_go() and dkp_svc() routines
(for known future fixes needed),
fixed DIA status calculation,
fixed DKP read/write loop to properly emulate DG cylinder and sector overflows,
added trace facility,
changed 'stime' calculation to force delay time if no cylinders are crossed
(this fixes some DG code that assumes disk seek takes some time),
fixed boot code to match DG hardware standard
04-Jan-04 RMS Changed attach routine to use sim_fsize
28-Nov-03 CEO Boot from DP now puts device address in SR
24-Nov-03 CEO Added support for disk sizing on 6099/6103
19-Nov-03 CEO Corrected major DMA Mapping bug
25-Apr-03 RMS Revised autosizing
08-Oct-02 RMS Added DIB
06-Jan-02 RMS Revised enable/disable support
30-Nov-01 RMS Added read only unit, extended SET/SHOW support
24-Nov-01 RMS Changed FLG, CAPAC to arrays
26-Apr-01 RMS Added device enable/disable support
12-Dec-00 RMS Added Eclipse support from Charles Owen
15-Oct-00 RMS Editorial changes
14-Apr-99 RMS Changed t_addr to unsigned
15-Sep-97 RMS Fixed bug in DIB/DOB for new disks
15-Sep-97 RMS Fixed bug in cylinder extraction (found by Charles Owen)
10-Sep-97 RMS Fixed bug in error reporting (found by Charles Owen)
25-Nov-96 RMS Defaulted to autosize
29-Jun-96 RMS Added unit disable support
*/
#include "nova_defs.h"
#define DKP_NUMDR 4 /* #drives */
#define DKP_NUMWD 256 /* words/sector */
#define UNIT_V_WLK (UNIT_V_UF + 0) /* write locked */
#define UNIT_V_DTYPE (UNIT_V_UF + 1) /* disk type */
#define UNIT_M_DTYPE 017
#define UNIT_V_AUTO (UNIT_V_UF + 5) /* autosize */
#define UNIT_WLK (1 << UNIT_V_WLK)
#define UNIT_DTYPE (UNIT_M_DTYPE << UNIT_V_DTYPE)
#define UNIT_AUTO (1 << UNIT_V_AUTO)
#define GET_DTYPE(x) (((x) >> UNIT_V_DTYPE) & UNIT_M_DTYPE)
#define FUNC u3 /* function */
#define CYL u4 /* on cylinder */
#define UNIT_WPRT (UNIT_WLK | UNIT_RO) /* write protect */
/* Unit, surface, sector, count register
Original format: 2b, 6b, 4b, 4b
Revised format: 2b, 5b, 5b, 4b
*/
#define USSC_V_COUNT 0 /* count */
#define USSC_M_COUNT 017
#define USSC_V_OSECTOR 4 /* old: sector */
#define USSC_M_OSECTOR 017
#define USSC_V_OSURFACE 8 /* old: surface */
#define USSC_M_OSURFACE 077
#define USSC_V_NSECTOR 4 /* new: sector */
#define USSC_M_NSECTOR 037
#define USSC_V_NSURFACE 9 /* new: surface */
#define USSC_M_NSURFACE 037
#define USSC_V_UNIT 14 /* unit */
#define USSC_M_UNIT 03
#define USSC_UNIT (USSC_M_UNIT << USSC_V_UNIT)
#define GET_COUNT(x) (((x) >> USSC_V_COUNT) & USSC_M_COUNT)
#define GET_SECT(x,dt) ((drv_tab[dt].newf)? \
(((x) >> USSC_V_NSECTOR) & USSC_M_NSECTOR): \
(((x) >> USSC_V_OSECTOR) & USSC_M_OSECTOR) )
#define GET_SURF(x,dt) ((drv_tab[dt].newf)? \
(((x) >> USSC_V_NSURFACE) & USSC_M_NSURFACE): \
(((x) >> USSC_V_OSURFACE) & USSC_M_OSURFACE) )
#define GET_UNIT(x) (((x) >> USSC_V_UNIT) & USSC_M_UNIT)
/* Flags, command, cylinder register
Original format: 5b, 2b, 1b + 8b (surrounding command)
Revised format: 5b, 2b, 9b
*/
#define FCCY_V_OCYL 0 /* old: cylinder */
#define FCCY_M_OCYL 0377
#define FCCY_V_OCMD 8 /* old: command */
#define FCCY_M_OCMD 3
#define FCCY_V_OCEX 10 /* old: cyl extend */
#define FCCY_OCEX (1 << FCCY_V_OCEX)
#define FCCY_V_NCYL 0 /* new: cylinder */
#define FCCY_M_NCYL 0777
#define FCCY_V_NCMD 9 /* new: command */
#define FCCY_M_NCMD 3
#define FCCY_READ 0
#define FCCY_WRITE 1
#define FCCY_SEEK 2
#define FCCY_RECAL 3
#define FCCY_FLAGS 0174000 /* flags */
#define GET_CMD(x,dt) ((drv_tab[dt].newf)? \
(((x) >> FCCY_V_NCMD) & FCCY_M_NCMD): \
(((x) >> FCCY_V_OCMD) & FCCY_M_OCMD) )
#define SET_CMD(x,dt) dkp_fccy = (dkp_fccy & ((drv_tab[dt].newf)? \
(FCCY_M_NCMD << FCCY_V_NCMD) : (FCCY_M_OCMD << FCCY_V_OCMD))) | \
((drv_tab[dt].newf)? \
(((x) & FCCY_M_NCMD) << FCCY_V_NCMD): \
(((x) & FCCY_M_OCMD) << FCCY_V_OCMD) )
#define GET_CYL(x,dt) ((drv_tab[dt].newf)? \
(((x) >> FCCY_V_NCYL) & FCCY_M_NCYL): \
((((x) >> FCCY_V_OCYL) & FCCY_M_OCYL) | \
((dt != TYPE_D44)? 0: \
(((x) & FCCY_OCEX) >> (FCCY_V_OCEX - FCCY_V_OCMD)))) )
/* (Warning: no sector or surface masking is done!) */
#define DKP_UPDATE_USSC( type, count, surf, sect ) \
dkp_ussc = (dkp_ussc & USSC_UNIT) \
| ((dkp_ussc + count) & USSC_M_COUNT) \
| ((drv_tab[dtype].newf)? \
((surf << USSC_V_NSURFACE) | (sect << USSC_V_NSECTOR)): \
((surf << USSC_V_OSURFACE) | (sect << USSC_V_OSECTOR)) \
);
/* Status */
#define STA_ERR 0000001 /* error */
#define STA_DLT 0000002 /* data late */
#define STA_CRC 0000004 /* crc error */
#define STA_UNS 0000010 /* unsafe */
#define STA_XCY 0000020 /* cross cylinder */
#define STA_CYL 0000040 /* nx cylinder */
#define STA_DRDY 0000100 /* drive ready */
#define STA_SEEK3 0000200 /* seeking unit 3 */
#define STA_SEEK2 0000400 /* seeking unit 2 */
#define STA_SEEK1 0001000 /* seeking unit 1 */
#define STA_SEEK0 0002000 /* seeking unit 0 */
#define STA_SKDN3 0004000 /* seek done unit 3 */
#define STA_SKDN2 0010000 /* seek done unit 2 */
#define STA_SKDN1 0020000 /* seek done unit 1 */
#define STA_SKDN0 0040000 /* seek done unit 0 */
#define STA_DONE 0100000 /* operation done */
#define STA_DYN (STA_DRDY | STA_CYL) /* set from unit */
#define STA_EFLGS (STA_ERR | STA_DLT | STA_CRC | STA_UNS | \
STA_XCY | STA_CYL) /* error flags */
#define STA_DFLGS (STA_DONE | STA_SKDN0 | STA_SKDN1 | \
STA_SKDN2 | STA_SKDN3) /* done flags */
#define GET_SA(cy,sf,sc,t) (((((cy)*drv_tab[t].surf)+(sf))* \
drv_tab[t].sect)+(sc))
/* This controller supports many different disk drive types:
type #sectors/ #surfaces/ #cylinders/ new format?
surface cylinder drive
floppy 8 1 77 no
DS/DD floppy 16 2 77 yes
(6097 "quad floppy")
Diablo 31 12 2 203 no
6225 20 2 245 yes
Century 111 6 10 203 no
4048 (same as Century 111)
Diablo 44 12 4 408 no
6099 32 4 192 yes
6227 20 6 245 yes
6070 24 4 408 yes
Century 114 12 20 203 no
4057 (same as Century 114)
6103 32 8 192 yes
4231 23 19 411 yes
In theory, each drive can be a different type. The size field in
each unit selects the drive capacity for each drive and thus the
drive type. DISKS MUST BE DECLARED IN ASCENDING SIZE.
*/
#define TYPE_FLP 0
#define SECT_FLP 8
#define SURF_FLP 1
#define CYL_FLP 77
#define SIZE_FLP (SECT_FLP * SURF_FLP * CYL_FLP * DKP_NUMWD)
#define NFMT_FLP FALSE
#define TYPE_DSDD 1
#define TYPE_6097 TYPE_DSDD
#define SECT_DSDD 16
#define SURF_DSDD 2
#define CYL_DSDD 77
#define SIZE_DSDD (SECT_DSDD * SURF_DSDD * CYL_DSDD * DKP_NUMWD)
#define NFMT_DSDD TRUE
#define TYPE_D31 2
#define SECT_D31 12
#define SURF_D31 2
#define CYL_D31 203
#define SIZE_D31 (SECT_D31 * SURF_D31 * CYL_D31 * DKP_NUMWD)
#define NFMT_D31 FALSE
#define TYPE_6225 3
#define SECT_6225 20
#define SURF_6225 2
#define CYL_6225 245
#define SIZE_6225 (SECT_6225 * SURF_6225 * CYL_6225 * DKP_NUMWD)
#define NFMT_6225 TRUE
#define TYPE_C111 4
#define SECT_C111 6
#define SURF_C111 10
#define CYL_C111 203
#define SIZE_C111 (SECT_C111 * SURF_C111 * CYL_C111 * DKP_NUMWD)
#define NFMT_C111 FALSE
#define TYPE_D44 5
#define SECT_D44 12
#define SURF_D44 4
#define CYL_D44 408
#define SIZE_D44 (SECT_D44 * SURF_D44 * CYL_D44 * DKP_NUMWD)
#define NFMT_D44 FALSE
#define TYPE_6099 6
#define SECT_6099 32
#define SURF_6099 4
#define CYL_6099 192
#define SIZE_6099 (SECT_6099 * SURF_6099 * CYL_6099 * DKP_NUMWD)
#define NFMT_6099 TRUE
#define TYPE_6227 7
#define SECT_6227 20
#define SURF_6227 6
#define CYL_6227 245
#define SIZE_6227 (SECT_6227 * SURF_6227 * CYL_6227 * DKP_NUMWD)
#define NFMT_6227 TRUE
#define TYPE_6070 8
#define SECT_6070 24
#define SURF_6070 4
#define CYL_6070 408
#define SIZE_6070 (SECT_6070 * SURF_6070 * CYL_6070 * DKP_NUMWD)
#define NFMT_6070 TRUE
#define TYPE_C114 9
#define SECT_C114 12
#define SURF_C114 20
#define CYL_C114 203
#define SIZE_C114 (SECT_C114 * SURF_C114 * CYL_C114 * DKP_NUMWD)
#define NFMT_C114 FALSE
#define TYPE_6103 10
#define SECT_6103 32
#define SURF_6103 8
#define CYL_6103 192
#define SIZE_6103 (SECT_6103 * SURF_6103 * CYL_6103 * DKP_NUMWD)
#define NFMT_6103 TRUE
#define TYPE_4231 11
#define SECT_4231 23
#define SURF_4231 19
#define CYL_4231 411
#define SIZE_4231 (SECT_4231 * SURF_4231 * CYL_4231 * DKP_NUMWD)
#define NFMT_4231 TRUE
struct drvtyp {
int32 sect; /* sectors */
int32 surf; /* surfaces */
int32 cyl; /* cylinders */
int32 size; /* #blocks */
int32 newf; /* new format flag */
};
struct drvtyp drv_tab[] = {
{ SECT_FLP, SURF_FLP, CYL_FLP, SIZE_FLP, NFMT_FLP },
{ SECT_DSDD, SURF_DSDD, CYL_DSDD, SIZE_DSDD, NFMT_DSDD },
{ SECT_D31, SURF_D31, CYL_D31, SIZE_D31, NFMT_D31 },
{ SECT_6225, SURF_6225, CYL_6225, SIZE_6225, NFMT_6225 },
{ SECT_C111, SURF_C111, CYL_C111, SIZE_C111, NFMT_C111 },
{ SECT_D44, SURF_D44, CYL_D44, SIZE_D44, NFMT_D44 },
{ SECT_6099, SURF_6099, CYL_6099, SIZE_6099, NFMT_6099 },
{ SECT_6227, SURF_6227, CYL_6227, SIZE_6227, NFMT_6227 },
{ SECT_6070, SURF_6070, CYL_6070, SIZE_6070, NFMT_6070 },
{ SECT_C114, SURF_C114, CYL_C114, SIZE_C114, NFMT_C114 },
{ SECT_6103, SURF_6103, CYL_6103, SIZE_6103, NFMT_6103 },
{ SECT_4231, SURF_4231, CYL_4231, SIZE_4231, NFMT_4231 },
{ 0 }
};
#define DKP_TRACE(x) (dkp_trace & (1<<(x)))
#define DKP_TRACE_FP stderr
/* current trace bit use (bit 0 = LSB)
0 I/O instructions
1 pre-seek/read/write event setup
2 seek events
3 read/write events
4 post read/write events
*/
extern uint16 M[];
extern UNIT cpu_unit;
extern int32 int_req, dev_busy, dev_done, dev_disable;
extern int32 saved_PC, SR, AMASK;
int32 dkp_ma = 0; /* memory address */
int32 dkp_map = 0; /* DCH map 0=A 3=B */
int32 dkp_ussc = 0; /* unit/sf/sc/cnt */
int32 dkp_fccy = 0; /* flags/cylinder */
int32 dkp_sta = 0; /* status register */
int32 dkp_swait = 100; /* seek latency */
int32 dkp_rwait = 100; /* rotate latency */
int32 dkp_diagmode = 0; /* diagnostic mode */
int32 dkp_trace = 0 ;
DEVICE dkp_dev;
int32 dkp (int32 pulse, int32 code, int32 AC);
t_stat dkp_svc (UNIT *uptr);
t_stat dkp_reset (DEVICE *dptr);
t_stat dkp_boot (int32 unitno, DEVICE *dptr);
t_stat dkp_attach (UNIT *uptr, char *cptr);
t_stat dkp_go ( int32 pulse );
t_stat dkp_set_size (UNIT *uptr, int32 val, char *cptr, void *desc);
/* DKP data structures
dkp_dev DKP device descriptor
dkp_unit DKP unit list
dkp_reg DKP register list
dkp_mod DKP modifier list
*/
DIB dkp_dib = { DEV_DKP, INT_DKP, PI_DKP, &dkp };
UNIT dkp_unit[] = {
{ UDATA (&dkp_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+UNIT_AUTO+
UNIT_ROABLE+(TYPE_D31 << UNIT_V_DTYPE), SIZE_D31) },
{ UDATA (&dkp_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+UNIT_AUTO+
UNIT_ROABLE+(TYPE_D31 << UNIT_V_DTYPE), SIZE_D31) },
{ UDATA (&dkp_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+UNIT_AUTO+
UNIT_ROABLE+(TYPE_D31 << UNIT_V_DTYPE), SIZE_D31) },
{ UDATA (&dkp_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+UNIT_AUTO+
UNIT_ROABLE+(TYPE_D31 << UNIT_V_DTYPE), SIZE_D31) }
};
REG dkp_reg[] = {
{ ORDATA (FCCY, dkp_fccy, 16) },
{ ORDATA (USSC, dkp_ussc, 16) },
{ ORDATA (STA, dkp_sta, 16) },
{ ORDATA (MA, dkp_ma, 16) },
{ FLDATA (INT, int_req, INT_V_DKP) },
{ FLDATA (BUSY, dev_busy, INT_V_DKP) },
{ FLDATA (DONE, dev_done, INT_V_DKP) },
{ FLDATA (DISABLE, dev_disable, INT_V_DKP) },
{ FLDATA (DIAG, dkp_diagmode, 0) },
{ DRDATA (TRACE, dkp_trace, 32) },
{ ORDATA (MAP, dkp_map, 2) },
{ DRDATA (STIME, dkp_swait, 24), PV_LEFT },
{ DRDATA (RTIME, dkp_rwait, 24), PV_LEFT },
{ URDATA (CAPAC, dkp_unit[0].capac, 10, T_ADDR_W, 0,
DKP_NUMDR, PV_LEFT | REG_HRO) },
{ NULL }
};
MTAB dkp_mod[] = {
{ UNIT_WLK, 0, "write enabled", "WRITEENABLED", NULL },
{ UNIT_WLK, UNIT_WLK, "write locked", "LOCKED", NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_FLP << UNIT_V_DTYPE) + UNIT_ATT,
"6030 (floppy)", NULL, NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_DSDD << UNIT_V_DTYPE) + UNIT_ATT,
"6097 (DS/DD floppy)", NULL, NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_D31 << UNIT_V_DTYPE) + UNIT_ATT,
"4047 (Diablo 31)", NULL, NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_D44 << UNIT_V_DTYPE) + UNIT_ATT,
"4234/6045 (Diablo 44)", NULL, NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_C111 << UNIT_V_DTYPE) + UNIT_ATT,
"4048 (Century 111)", NULL, NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_C114 << UNIT_V_DTYPE) + UNIT_ATT,
"2314/4057 (Century 114)", NULL, NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_6225 << UNIT_V_DTYPE) + UNIT_ATT,
"6225", NULL, NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_6227 << UNIT_V_DTYPE) + UNIT_ATT,
"6227", NULL, NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_6099 << UNIT_V_DTYPE) + UNIT_ATT,
"6099", NULL, NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_6103 << UNIT_V_DTYPE) + UNIT_ATT,
"6103", NULL, NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_6070 << UNIT_V_DTYPE) + UNIT_ATT,
"6070", NULL, NULL },
{ (UNIT_DTYPE+UNIT_ATT), (TYPE_4231 << UNIT_V_DTYPE) + UNIT_ATT,
"4231/3330", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_FLP << UNIT_V_DTYPE),
"6030 (floppy)", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_DSDD << UNIT_V_DTYPE),
"6097 (DS/DD floppy)", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_D31 << UNIT_V_DTYPE),
"4047 (Diablo 31)", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_D44 << UNIT_V_DTYPE),
"4234/6045 (Diablo 44)", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_C111 << UNIT_V_DTYPE),
"4048 (Century 111)", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_C114 << UNIT_V_DTYPE),
"2314/4057 (Century 114)", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_6225 << UNIT_V_DTYPE),
"6225", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_6227 << UNIT_V_DTYPE),
"6227", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_6099 << UNIT_V_DTYPE),
"6099", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_6103 << UNIT_V_DTYPE),
"6103", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_6070 << UNIT_V_DTYPE),
"6070", NULL, NULL },
{ (UNIT_AUTO+UNIT_DTYPE+UNIT_ATT), (TYPE_4231 << UNIT_V_DTYPE),
"4231/3330", NULL, NULL },
{ (UNIT_AUTO+UNIT_ATT), UNIT_AUTO, "autosize", NULL, NULL },
{ UNIT_AUTO, UNIT_AUTO, NULL, "AUTOSIZE", NULL },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_FLP << UNIT_V_DTYPE),
NULL, "FLOPPY", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_FLP << UNIT_V_DTYPE),
NULL, "6030", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_DSDD << UNIT_V_DTYPE),
NULL, "DSDDFLOPPY", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_DSDD << UNIT_V_DTYPE),
NULL, "6097", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_D31 << UNIT_V_DTYPE),
NULL, "D31", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_D31 << UNIT_V_DTYPE),
NULL, "4047", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_D44 << UNIT_V_DTYPE),
NULL, "D44", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_D44 << UNIT_V_DTYPE),
NULL, "4234", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_D44 << UNIT_V_DTYPE),
NULL, "6045", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_C111 << UNIT_V_DTYPE),
NULL, "C111", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_C111 << UNIT_V_DTYPE),
NULL, "4048", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_C114 << UNIT_V_DTYPE),
NULL, "C114", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_C114 << UNIT_V_DTYPE),
NULL, "2314", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_C114 << UNIT_V_DTYPE),
NULL, "4057", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_6225 << UNIT_V_DTYPE),
NULL, "6225", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_6227 << UNIT_V_DTYPE),
NULL, "6227", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_6099 << UNIT_V_DTYPE),
NULL, "6099", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_6103 << UNIT_V_DTYPE),
NULL, "6103", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_6070 << UNIT_V_DTYPE),
NULL, "6070", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_4231 << UNIT_V_DTYPE),
NULL, "4231", &dkp_set_size },
{ (UNIT_AUTO+UNIT_DTYPE), (TYPE_4231 << UNIT_V_DTYPE),
NULL, "3330", &dkp_set_size },
{ 0 }
};
DEVICE dkp_dev = {
"DKP", dkp_unit, dkp_reg, dkp_mod,
DKP_NUMDR, 8, 30, 1, 8, 16,
NULL, NULL, &dkp_reset,
&dkp_boot, &dkp_attach, NULL,
&dkp_dib, DEV_DISABLE
};
/* IOT routine */
int32 dkp (int32 pulse, int32 code, int32 AC)
{
UNIT *uptr;
int32 u, rval, dtype;
rval = 0;
uptr = dkp_dev.units + GET_UNIT (dkp_ussc); /* select unit */
dtype = GET_DTYPE (uptr->flags); /* get drive type */
if ( DKP_TRACE(0) )
{
static char * f[8] =
{ "NIO", "DIA", "DOA", "DIB", "DOB", "DIC", "DOC", "SKP" } ;
static char * s[4] =
{ " ", "S", "C", "P" } ;
printf( " [DKP %s%s %06o ", f[code & 0x07], s[pulse & 0x03], (AC & 0xFFFF) ) ;
}
switch (code) { /* decode IR<5:7> */
case ioDIA: /* DIA */
dkp_sta = dkp_sta & (~STA_DRDY) ; /* keep error flags */
if (uptr->flags & UNIT_ATT) /* update ready */
dkp_sta = dkp_sta | STA_DRDY;
if (uptr->CYL >= drv_tab[dtype].cyl)
dkp_sta = dkp_sta | STA_CYL; /* bad cylinder? */
if (dkp_sta & STA_EFLGS)
dkp_sta = dkp_sta | STA_ERR;
rval = dkp_sta;
break;
case ioDOA: /* DOA */
if (AC & 0100000) /* clear rw done? */
dkp_sta = dkp_sta & ~(STA_CYL|STA_XCY|STA_UNS|STA_CRC);
if ((dev_busy & INT_DKP) == 0) {
dkp_fccy = AC; /* save cmd, cyl */
dkp_sta = dkp_sta & ~(AC & FCCY_FLAGS);
}
DEV_CLR_DONE( INT_DKP ) ; /* assume done flags 0 */
if ( dkp_sta & STA_DFLGS ) /* done flags = 0? */
DEV_SET_DONE( INT_DKP ) ; /* nope - set done */
DEV_UPDATE_INTR ; /* update intr */
break;
case ioDIB: /* DIB */
rval = dkp_ma & 077777 ; /* return buf addr */
/* with B0 clear (no DCH B map support) */
break;
case ioDOB: /* DOB */
if ((dev_busy & INT_DKP) == 0) {
dkp_ma = AC & (drv_tab[dtype].newf? DMASK: AMASK);
if (AC & 0100000)
dkp_map = 3; /* high bit is map */
else
dkp_map = 0;
}
break;
case ioDIC: /* DIC */
rval = dkp_ussc; /* return unit, sect */
break;
case ioDOC: /* DOC */
if ((dev_busy & INT_DKP) == 0) /* if device is not busy */
dkp_ussc = AC ; /* save unit, sect */
if (((dtype == TYPE_6099) || /* (BKR: don't forget 6097) */
(dtype == TYPE_6097) || /* for 6099 and 6103 */
(dtype == TYPE_6103)) && /* if data<0> set, */
(AC & 010000) )
dkp_diagmode = 1; /* set diagnostic mode */
break;
} /* end switch code */
u = GET_UNIT(dkp_ussc); /* update current unit */
uptr = dkp_dev.units + u ; /* select unit */
dtype = GET_DTYPE (uptr->flags); /* get drive type */
if ( DKP_TRACE(0) )
{
if ( code & 1 )
printf( " [%06o] ", (rval & 0xFFFF) ) ;
printf( "] \n" ) ;
}
switch (pulse) { /* decode IR<8:9> */
case iopS: /* start */
DEV_SET_BUSY( INT_DKP ) ; /* set busy */
DEV_CLR_DONE( INT_DKP ) ; /* clear done */
DEV_UPDATE_INTR ; /* update ints */
if (dkp_diagmode) { /* in diagnostic mode? */
dkp_diagmode = 0; /* reset it */
if (dtype == TYPE_6097) /* (BKR - quad floppy) */
dkp_ussc = 010001;
if (dtype == TYPE_6099) /* return size bits */
dkp_ussc = 010002;
if (dtype == TYPE_6103) /* for certain types */
dkp_ussc = 010003;
}
else { /* normal mode ... */
if (dkp_go (pulse)) /* do command */
break ; /* break if no error */
}
DEV_CLR_BUSY( INT_DKP ) ; /* clear busy */
DEV_SET_DONE( INT_DKP ) ; /* set done */
DEV_UPDATE_INTR ; /* update ints */
dkp_sta = dkp_sta | STA_DONE; /* set controller done */
break;
case iopC: /* clear */
DEV_CLR_BUSY( INT_DKP ) ; /* clear busy */
DEV_CLR_DONE( INT_DKP ) ; /* set done */
DEV_UPDATE_INTR ; /* update ints */
dkp_sta = dkp_sta & ~(STA_DFLGS + STA_EFLGS); /* clear controller flags */
if (dkp_unit[u].FUNC != FCCY_SEEK)
sim_cancel (&dkp_unit[u]); /* cancel any r/w op */
break;
case iopP: /* pulse */
if ( dkp_diagmode )
{
dkp_diagmode = 0 ; /* clear DG diagnostic mode */
}
else
{
DEV_CLR_DONE( INT_DKP ) ; /* clear done */
DEV_UPDATE_INTR ;
/* DG "undocumented feature": 'P' pulse can not start a read/write operation!
* Diagnostic routines will use this crock to do 'crazy things' to size a disk
* and many assume that a recal is done, other assume that they can stop the
* read operation before any damage is done. Must also [re]calculate unit, function
* and type because DOx instruction may have updated the controller info after
* start of this procedure and before our 'P' handler. BKR
*/
if (dkp_go(pulse))
break; /* no error - do not set done and status */
}
DEV_SET_DONE( INT_DKP ) ; /* set done */
DEV_UPDATE_INTR ; /* update ints */
dkp_sta = dkp_sta | (STA_SKDN0 >> u); /* set controller seek done */
break;
} /* end case pulse */
return rval;
}
/* New command, start vs pulse handled externally
Returns true if command ok, false if error
*/
t_stat dkp_go ( int32 pulse )
{
UNIT * uptr;
int32 oldCyl, u, dtype;
dkp_sta = dkp_sta & ~STA_EFLGS; /* clear errors */
u = GET_UNIT (dkp_ussc); /* get unit number */
uptr = dkp_dev.units + u; /* get unit */
if (((uptr->flags & UNIT_ATT) == 0) || sim_is_active (uptr)) {
dkp_sta = dkp_sta | STA_ERR; /* attached or busy? */
return FALSE;
}
if (dkp_diagmode) { /* diagnostic mode? */
dkp_sta = (dkp_sta | STA_DONE); /* Set error bit only */
DEV_CLR_BUSY( INT_DKP ) ; /* clear busy */
DEV_SET_DONE( INT_DKP ) ; /* set done */
DEV_UPDATE_INTR ; /* update interrupts */
return ( TRUE ) ; /* do not do function */
}
oldCyl = uptr->CYL ; /* get old cylinder */
dtype = GET_DTYPE (uptr->flags); /* get drive type */
uptr->FUNC = GET_CMD (dkp_fccy, dtype) ; /* save command */
uptr->CYL = GET_CYL (dkp_fccy, dtype) ;
if ( DKP_TRACE(1) )
{
int32 xSect ;
int32 xSurf ;
int32 xCyl ;
int32 xCnt ;
xSect = GET_SECT(dkp_ussc, dtype) ;
xSurf = GET_SURF(dkp_ussc, dtype) ;
xCyl = GET_CYL (dkp_fccy, dtype) ;
xCnt = 16 - (GET_COUNT(dkp_ussc)) ;
fprintf( DKP_TRACE_FP,
" [%s:%c %-5s: %3d / %2d / %2d %2d %06o ] \r\n",
"DKP",
(char) (u + '0'),
((uptr->FUNC == FCCY_READ) ?
"read"
: ((uptr->FUNC == FCCY_WRITE) ?
"write"
: ((uptr->FUNC == FCCY_SEEK) ?
"seek"
: "<???>"
)
)
),
(unsigned) xCyl,
(unsigned) xSurf,
(unsigned) xSect,
(unsigned) (16 - xCnt),
(unsigned) (dkp_ma & 0xFFFF) /* show all 16-bits in case DCH B */
) ;
}
switch (uptr->FUNC) { /* decode command */
case FCCY_READ:
case FCCY_WRITE:
if (((uptr->flags & UNIT_ATT) == 0) || /* not attached? */
((uptr->flags & UNIT_WPRT) && (uptr->FUNC == FCCY_WRITE)))
{
dkp_sta = dkp_sta | STA_DONE | STA_ERR; /* error */
}
else if ( uptr->CYL >= drv_tab[dtype].cyl ) /* bad cylinder */
{
dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_CYL ;
}
else if ( GET_SURF(dkp_ussc, dtype) >= drv_tab[dtype].surf ) /* bad surface */
{
dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_UNS; /* older drives may not even do this... */
/* dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_XCY ; /- newer disks give this error */
}
else if ( GET_SECT(dkp_ussc, dtype) >= drv_tab[dtype].sect ) /* or bad sector? */
{
/* dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_UNS; /- older drives may not even do this... */
dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_XCY ; /* newer disks give this error */
}
if ( (pulse != iopS) || (dkp_sta & STA_ERR) )
{
return ( FALSE ) ;
}
sim_activate (uptr, dkp_rwait); /* schedule read or write request */
break;
case FCCY_RECAL: /* recalibrate */
uptr->FUNC = FCCY_SEEK ; /* save command */
uptr->CYL = 0 ;
case FCCY_SEEK: /* seek */
if ( ! (uptr->flags & UNIT_ATT) ) /* not attached? */
{
dkp_sta = dkp_sta | STA_DONE | STA_ERR; /* error */
}
else if ( uptr->CYL >= drv_tab[dtype].cyl ) /* bad cylinder? */
{
dkp_sta = dkp_sta | STA_ERR | STA_CYL;
}
if ( (pulse != iopP) || (dkp_sta & STA_ERR) )
{
return ( FALSE ) ; /* only 'P' pulse start seeks! */
}
/* do the seek */
/* must check for "do we support seeking bits" flag before setting SEEK0'ish bits! */
dkp_sta = dkp_sta | (STA_SEEK0 >> u); /* set seeking */
oldCyl = abs(oldCyl - uptr->CYL) ;
if ( (dkp_swait) && (! (oldCyl)) ) /* enforce minimum wait if req */
oldCyl = 1 ;
sim_activate ( uptr, (dkp_swait * oldCyl) ) ;
break;
} /* end case command */
return ( TRUE ) ; /* no error */
}
/* Unit service
If seek done, put on cylinder;
else, do read or write
If controller was busy, clear busy, set done, interrupt
Memory access: sectors are read into/written from an intermediate
buffer to allow word-by-word mapping of memory addresses on the
Eclipse. This allows each word written to memory to be tested
for out of range.
*/
t_stat dkp_svc (UNIT *uptr)
{
int32 sa, bda;
int32 dx, pa, u;
int32 dtype, err, newsect, newsurf;
uint32 awc;
t_stat rval;
static uint16 tbuf[DKP_NUMWD]; /* transfer buffer */
rval = SCPE_OK;
dtype = GET_DTYPE (uptr->flags); /* get drive type */
u = uptr - dkp_dev.units; /* get unit number */
if (uptr->FUNC == FCCY_SEEK) { /* seek? */
if ( ! (uptr->flags & UNIT_ATT) ) /* not attached? */
{
dkp_sta = dkp_sta | STA_DONE | STA_ERR; /* error (changed during queue time?) */
}
else if ( uptr->CYL >= drv_tab[dtype].cyl ) /* bad cylinder? */
{
dkp_sta = dkp_sta | STA_ERR | STA_CYL;
}
DEV_SET_DONE( INT_DKP ) ;
DEV_UPDATE_INTR ;
dkp_sta = (dkp_sta | (STA_SKDN0 >> u)) /* set seek done */
& ~(STA_SEEK0 >> u); /* clear seeking */
if ( DKP_TRACE(2) )
{
fprintf( DKP_TRACE_FP,
" [%s:%c seek : %4d ] \r\n",
"DKP",
(char) (u + '0'),
(unsigned) (uptr->CYL)
) ;
}
return SCPE_OK;
}
/* read or write */
if (((uptr->flags & UNIT_ATT) == 0) || /* not attached? */
((uptr->flags & UNIT_WPRT) && (uptr->FUNC == FCCY_WRITE)))
{
dkp_sta = dkp_sta | STA_DONE | STA_ERR; /* error */
}
else if ( uptr->CYL >= drv_tab[dtype].cyl ) /* bad cylinder */
{
dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_CYL ;
dkp_sta = dkp_sta | STA_ERR | STA_CYL;
DEV_SET_DONE( INT_DKP ) ;
DEV_UPDATE_INTR ;
return SCPE_OK ;
}
else if ( GET_SURF(dkp_ussc, dtype) >= drv_tab[dtype].surf ) /* bad surface */
{
dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_UNS; /* older drives may not even do this... */
/* dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_XCY ; /- newer disks give this error */
/* set sector to some bad value and wait then exit? */
}
else if ( GET_SECT(dkp_ussc, dtype) >= drv_tab[dtype].sect ) /* or bad sector? */
{
/* dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_UNS; /- older DG drives do not even give error(!), but we do */
dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_XCY ; /* newer disks give this error */
}
else {
err = 0 ;
do {
if ( DKP_TRACE(3) )
{
fprintf( DKP_TRACE_FP,
" [%s:%c %-5s: %3d / %2d / %2d %06o ] \r\n",
"DKP",
(char) (u + '0'),
((uptr->FUNC == FCCY_READ) ?
"read"
: ((uptr->FUNC == FCCY_WRITE) ?
"write"
: "<???>")
),
(unsigned) (uptr->CYL),
(unsigned) (GET_SURF(dkp_ussc, dtype)),
(unsigned) (GET_SECT(dkp_ussc, dtype)),
(unsigned) (dkp_ma & 0xFFFF) /* show all 16-bits in case DCH B */
) ;
}
if ( GET_SECT(dkp_ussc, dtype) >= drv_tab[dtype].sect ) /* or bad sector? */
{
/* sector overflows to 0 ;
* surface gets incremented
*/
newsurf = GET_SURF(dkp_ussc, dtype) + 1 ;
newsurf = newsurf & ((drv_tab[dtype].newf) ? USSC_M_NSURFACE : USSC_M_OSURFACE) ;
DKP_UPDATE_USSC( type, 0, newsurf, 0 )
if ( (GET_SURF(dkp_ussc, dtype)) >= drv_tab[dtype].surf )
{
/* dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_UNS; /- older drives may not even do this... */
dkp_sta = dkp_sta | STA_DONE | STA_ERR | STA_XCY ; /* newer disks give this error */
/* DG retains overflowed surface number,
* other vendors have different/expanded options
*/
break ;
}
}
sa = GET_SA (uptr->CYL, GET_SURF (dkp_ussc, dtype),
GET_SECT (dkp_ussc, dtype), dtype); /* get disk block */
bda = sa * DKP_NUMWD * sizeof(uint16) ; /* to words, bytes */
err = fseek (uptr->fileref, bda, SEEK_SET); /* position drive */
if (uptr->FUNC == FCCY_READ) { /* read? */
awc = fxread (tbuf, sizeof(uint16), DKP_NUMWD, uptr->fileref);
for ( ; awc < DKP_NUMWD; awc++) tbuf[awc] = 0;
if (err = ferror (uptr->fileref))
break;
for (dx = 0; dx < DKP_NUMWD; dx++) { /* loop thru buffer */
pa = MapAddr (dkp_map, (dkp_ma & AMASK));
if (MEM_ADDR_OK (pa))
M[pa] = tbuf[dx];
dkp_ma = (dkp_ma + 1) & AMASK;
}
}
else if (uptr->FUNC == FCCY_WRITE) { /* write? */
for (dx = 0; dx < DKP_NUMWD; dx++) { /* loop into buffer */
pa = MapAddr (dkp_map, (dkp_ma & AMASK));
tbuf[dx] = M[pa];
dkp_ma = (dkp_ma + 1) & AMASK;
}
fxwrite (tbuf, sizeof(int16), DKP_NUMWD, uptr->fileref);
if (err = ferror (uptr->fileref))
break;
}
if (err != 0) {
perror ("DKP I/O error");
clearerr (uptr->fileref);
rval = SCPE_IOERR;
break ;
}
newsect = GET_SECT (dkp_ussc, dtype) + 1 ; /* update next sector */
newsurf = GET_SURF (dkp_ussc, dtype) ; /* and next head */
/* (count set below) */
DKP_UPDATE_USSC( type, 1, newsurf, newsect )
} /* end read/write loop */
while ( (GET_COUNT(dkp_ussc)) ) ;
dkp_sta = dkp_sta | STA_DONE; /* set status */
if ( DKP_TRACE(4) )
{
fprintf( DKP_TRACE_FP,
" [%s:%c %-5s: %3d / %2d / %2d %06o ] \r\n",
"DKP",
(char) (u + '0'),
"post",
(unsigned) (uptr->CYL),
(unsigned) (GET_SURF(dkp_ussc, dtype)),
(unsigned) (GET_SECT(dkp_ussc, dtype)),
(unsigned) (dkp_ma & 0xFFFF) /* show all 16-bits in case DCH B */
) ;
}
}
DEV_CLR_BUSY( INT_DKP ) ;
DEV_SET_DONE( INT_DKP ) ;
DEV_UPDATE_INTR ;
return rval;
}
/* Reset routine */
t_stat dkp_reset (DEVICE *dptr)
{
int32 u;
UNIT *uptr;
DEV_CLR_BUSY( INT_DKP ) ; /* clear busy */
DEV_CLR_DONE( INT_DKP ) ; /* clear done */
DEV_UPDATE_INTR ; /* update ints */
dkp_fccy = dkp_ussc = dkp_ma = dkp_sta = 0; /* clear registers */
dkp_diagmode = 0; /* clear diagnostic mode */
dkp_map = 0;
for (u = 0; u < DKP_NUMDR; u++) { /* loop thru units */
uptr = dkp_dev.units + u;
sim_cancel (uptr); /* cancel activity */
uptr->CYL = uptr->FUNC = 0;
}
return SCPE_OK;
}
/* Attach routine (with optional autosizing) */
t_stat dkp_attach (UNIT *uptr, char *cptr)
{
int32 i, p;
t_stat r;
uptr->capac = drv_tab[GET_DTYPE (uptr->flags)].size; /* restore capac */
r = attach_unit (uptr, cptr); /* attach */
if ((r != SCPE_OK) || !(uptr->flags & UNIT_AUTO))
return r;
if ((p = sim_fsize (uptr->fileref)) == 0) /* get file size */
return SCPE_OK;
for (i = 0; drv_tab[i].sect != 0; i++) {
if (p <= (drv_tab[i].size * (int32) sizeof (uint16))) {
uptr->flags = (uptr->flags & ~UNIT_DTYPE) | (i << UNIT_V_DTYPE);
uptr->capac = drv_tab[i].size;
return SCPE_OK;
}
}
return SCPE_OK;
}
/* Set size command validation routine */
t_stat dkp_set_size (UNIT *uptr, int32 val, char *cptr, void *desc)
{
if (uptr->flags & UNIT_ATT)
return SCPE_ALATT;
uptr->capac = drv_tab[GET_DTYPE (val)].size;
return SCPE_OK;
}
/* Bootstrap routine */
#if defined(_OLD_CODE_)
#define BOOT_START 02000
#define BOOT_UNIT 02021
#define BOOT_SEEK 02022
#define BOOT_LEN (sizeof(boot_rom) / sizeof(int32))
static const int32 boot_rom[] = {
0060233, /* NIOC 0,DKP ; clear disk */
0020420, /* LDA 0,USSC ; unit, sfc, sec, cnt */
0063033, /* DOC 0,DKP ; select disk */
0020417, /* LDA 0,SEKCMD ; command, cylinder */
0061333, /* DOAP 0,DKP ; start seek */
0024415, /* LDA 1,SEKDN */
0060433, /* DIA 0,DKP ; get status */
0123415, /* AND# 1,0,SZR ; skip if done */
0000776, /* JMP .-2 */
0102400, /* SUB 0,0 ; mem addr = 0 */
0062033, /* DOB 0,DKP */
0020411, /* LDA 0,REDCMD ; command, cylinder */
0061133, /* DOAS 0,DKP ; start read */
0060433, /* DIA 0, DKP ; get status */
0101113, /* MOVL# 0,0,SNC ; skip if done */
0000776, /* JMP .-2 */
0000377, /* JMP 377 */
0000016, /* USSC: 0.B1+0.B7+0.B11+16 */
0175000, /* SEKCMD: 175000 */
0074000, /* SEKDN: 074000 */
0174000 /* REDCMD: 174000 */
};
t_stat dkp_boot (int32 unitno, DEVICE *dptr)
{
int32 i, dtype;
extern int32 saved_PC, SR;
for (i = 0; i < BOOT_LEN; i++) M[BOOT_START + i] = boot_rom[i];
unitno = unitno & USSC_M_UNIT;
dtype = GET_DTYPE (dkp_unit[unitno].flags);
M[BOOT_UNIT] = M[BOOT_UNIT] | (unitno << USSC_V_UNIT);
if (drv_tab[dtype].newf) M[BOOT_SEEK] = 0176000;
saved_PC = BOOT_START;
SR = 0100000 + DEV_DKP;
return SCPE_OK;
}
#endif /* _OLD_CODE_ */
#define BOOT_START 0375
#define BOOT_LEN (sizeof (boot_rom) / sizeof (int32))
static const int32 boot_rom[] = {
0062677 /* IORST ; reset the I/O system */
, 0060133 /* NIOS DKP ; start the disk */
, 0000377 /* JMP 377 ; wait for the world */
} ;
t_stat dkp_boot (int32 unitno, DEVICE *dptr)
{
int32 i;
for (i = 0; i < BOOT_LEN; i++)
M[BOOT_START + i] = (uint16) boot_rom[i];
saved_PC = BOOT_START;
SR = 0100000 + DEV_DKP;
return SCPE_OK;
}