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/* hp2100_dr.c: HP 2100 12606B/12610B fixed head disk/drum simulator
Copyright (c) 1993-2016, Robert M. Supnik
Copyright (c) 2017-2018, J. David Bryan
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 THE
AUTHORS 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 names of the authors shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the authors.
DR 12606B 2770/2771 fixed head disk
12610B 2773/2774/2775 drum
27-Feb-18 JDB Added the BBDL, reworked drc_boot to use cpu_copy_loader
21-Feb-18 JDB ATTACH -N now creates a full-size disc image
19-Jul-17 JDB Removed "dr_stopioe" variable and register
11-Jul-17 JDB Renamed "ibl_copy" to "cpu_ibl"
27-Feb-17 JDB ibl_copy no longer returns a status code
10-Nov-16 JDB Modified the drc_boot routine to use the BBDL
05-Aug-16 JDB Renamed the P register from "PC" to "PR"
13-May-16 JDB Modified for revised SCP API function parameter types
30-Dec-14 JDB Added S-register parameters to ibl_copy
24-Dec-14 JDB Added casts for explicit downward conversions
10-Feb-12 JDB Deprecated DEVNO in favor of SC
28-Mar-11 JDB Tidied up signal handling
26-Oct-10 JDB Changed I/O signal handler for revised signal model
09-Jul-08 JDB Revised drc_boot to use ibl_copy
26-Jun-08 JDB Rewrote device I/O to model backplane signals
28-Dec-06 JDB Added ioCRS state to I/O decoders
07-Oct-04 JDB Fixed enable/disable from either device
Fixed sector return in status word
Provided protected tracks and "Writing Enabled" status bit
Fixed DMA last word write, incomplete sector fill value
Added "parity error" status return on writes for 12606
Added track origin test for 12606
Added SCP test for 12606
Fixed 12610 SFC operation
Added "Sector Flag" status bit
Added "Read Inhibit" status bit for 12606
Fixed current-sector determination
Added PROTECTED, UNPROTECTED, TRACKPROT modifiers
26-Aug-04 RMS Fixed CLC to stop operation (from Dave Bryan)
26-Apr-04 RMS Fixed SFS x,C and SFC x,C
Revised boot rom to use IBL algorithm
Implemented DMA SRQ (follows FLG)
27-Jul-03 RMS Fixed drum sizes
Fixed variable capacity interaction with SAVE/RESTORE
10-Nov-02 RMS Added BOOT command
References:
- 12606B Disc Memory Interface Kit Operating and Service Manual
(12606-90012, Mar-1970)
- 12610B Drum Memory Interface Kit Operating and Service Manual
(12610-9001, Feb-1970)
These head-per-track devices are buffered in memory, to minimize overhead.
The drum data channel does not have a command flip-flop. Its control
flip-flop is not wired into the interrupt chain; accordingly, the
simulator uses command rather than control for the data channel. Its
flag does not respond to SFS, SFC, or STF.
The drum control channel does not have any of the traditional flip-flops.
The 12606 interface implements two diagnostic tests. An SFS CC instruction
will skip if the disk has passed the track origin (sector 0) since the last
CLF CC instruction, and an SFC CC instruction will skip if the Sector Clock
Phase (SCP) flip-flop is clear, indicating that the current sector is
accessible. The 12610 interface does not support these tests; the SKF signal
is not driven, so neither SFC CC nor SFS CC will skip.
The interface implements a track protect mechanism via a switch and a set of
on-card diodes. The switch sets the protected/unprotected status, and the
particular diodes installed indicate the range of tracks (a power of 2) that
are read-only in the protected mode.
Somewhat unusually, writing to a protected track completes normally, but the
data isn't actually written, as the write current is inhibited. There is no
"failure" status indication. Instead, a program must note the lack of
"Writing Enabled" status before the write is attempted.
Specifications (2770/2771):
- 90 sectors per logical track
- 45 sectors per revolution
- 64 words per sector
- 2880 words per revolution
- 3450 RPM = 17.4 ms/revolution
- data timing = 6.0 us/word, 375 us/sector
- inst timing = 4 inst/word, 11520 inst/revolution
Specifications 2773/2774/2775:
- 32 sectors per logical track
- 32 sectors per revolution
- 64 words per sector
- 2048 words per revolution
- 3450 RPM = 17.4 ms/revolution
- data timing = 8.5 us/word, 550 us/sector
- inst timing = 6 inst/word, 12288 inst/revolution
*/
#include "hp2100_defs.h"
#include "hp2100_cpu.h"
#include <math.h>
/* Constants */
#define DR_NUMWD 64 /* words/sector */
#define DR_FNUMSC 90 /* fhd sec/track */
#define DR_DNUMSC 32 /* drum sec/track */
#define DR_NUMSC ((drc_unit.flags & UNIT_DRUM)? DR_DNUMSC: DR_FNUMSC)
#define DR_SIZE (512 * DR_DNUMSC * DR_NUMWD) /* initial size */
#define DR_FTIME 4 /* fhd per-word time */
#define DR_DTIME 6 /* drum per-word time */
#define DR_OVRHEAD 5 /* overhead words at track start */
#define UNIT_V_PROT (UNIT_V_UF + 0) /* track protect */
#define UNIT_V_SZ (UNIT_V_UF + 1) /* disk vs drum */
#define UNIT_M_SZ 017 /* size */
#define UNIT_PROT (1 << UNIT_V_PROT)
#define UNIT_SZ (UNIT_M_SZ << UNIT_V_SZ)
#define UNIT_DRUM (1 << UNIT_V_SZ) /* low order bit */
#define SZ_180K 000 /* disks */
#define SZ_360K 002
#define SZ_720K 004
#define SZ_1024K 001 /* drums: default size */
#define SZ_1536K 003
#define SZ_384K 005
#define SZ_512K 007
#define SZ_640K 011
#define SZ_768K 013
#define SZ_896K 015
#define DR_GETSZ(x) (((x) >> UNIT_V_SZ) & UNIT_M_SZ)
/* Command word */
#define CW_WR 0100000 /* write vs read */
#define CW_V_FTRK 7 /* fhd track */
#define CW_M_FTRK 0177
#define CW_V_DTRK 5 /* drum track */
#define CW_M_DTRK 01777
#define MAX_TRK (((drc_unit.flags & UNIT_DRUM)? CW_M_DTRK: CW_M_FTRK) + 1)
#define CW_GETTRK(x) ((drc_unit.flags & UNIT_DRUM)? \
(((x) >> CW_V_DTRK) & CW_M_DTRK): \
(((x) >> CW_V_FTRK) & CW_M_FTRK))
#define CW_PUTTRK(x) ((drc_unit.flags & UNIT_DRUM)? \
(((x) & CW_M_DTRK) << CW_V_DTRK): \
(((x) & CW_M_FTRK) << CW_V_FTRK))
#define CW_V_FSEC 0 /* fhd sector */
#define CW_M_FSEC 0177
#define CW_V_DSEC 0 /* drum sector */
#define CW_M_DSEC 037
#define CW_GETSEC(x) ((drc_unit.flags & UNIT_DRUM)? \
(((x) >> CW_V_DSEC) & CW_M_DSEC): \
(((x) >> CW_V_FSEC) & CW_M_FSEC))
#define CW_PUTSEC(x) ((drc_unit.flags & UNIT_DRUM)? \
(((x) & CW_M_DSEC) << CW_V_DSEC): \
(((x) & CW_M_FSEC) << CW_V_FSEC))
/* Status register, ^ = dynamic */
#define DRS_V_NS 8 /* ^next sector */
#define DRS_M_NS 0177
#define DRS_SEC 0100000 /* ^sector flag */
#define DRS_RDY 0000200 /* ^ready */
#define DRS_RIF 0000100 /* ^read inhibit */
#define DRS_SAC 0000040 /* sector coincidence */
#define DRS_ABO 0000010 /* abort */
#define DRS_WEN 0000004 /* ^write enabled */
#define DRS_PER 0000002 /* parity error */
#define DRS_BSY 0000001 /* ^busy */
#define CALC_SCP(x) (((int32) fmod ((x) / (double) dr_time, \
(double) (DR_NUMWD))) >= (DR_NUMWD - 3))
int32 drc_cw = 0; /* fnc, addr */
int32 drc_sta = 0; /* status */
int32 drc_run = 0; /* run flip-flop */
struct {
FLIP_FLOP control; /* control flip-flop */
FLIP_FLOP flag; /* flag flip-flop */
} drd = { CLEAR, CLEAR };
int32 drd_ibuf = 0; /* input buffer */
int32 drd_obuf = 0; /* output buffer */
int32 drd_ptr = 0; /* sector pointer */
int32 drc_pcount = 1; /* number of prot tracks */
int32 dr_time = DR_DTIME; /* time per word */
static int32 sz_tab[16] = {
184320, 1048576, 368640, 1572864, 737280, 393216, 0, 524288,
0, 655360, 0, 786432, 0, 917504, 0, 0 };
IOHANDLER drdio;
IOHANDLER drcio;
t_stat drc_svc (UNIT *uptr);
t_stat drc_reset (DEVICE *dptr);
t_stat drc_attach (UNIT *uptr, CONST char *cptr);
t_stat drc_boot (int32 unitno, DEVICE *dptr);
int32 dr_incda (int32 trk, int32 sec, int32 ptr);
int32 dr_seccntr (double simtime);
t_stat dr_set_prot (UNIT *uptr, int32 val, CONST char *cptr, void *desc);
t_stat dr_show_prot (FILE *st, UNIT *uptr, int32 val, CONST void *desc);
t_stat dr_set_size (UNIT *uptr, int32 val, CONST char *cptr, void *desc);
DEVICE drd_dev, drc_dev;
/* DRD data structures
drd_dev device descriptor
drd_unit unit descriptor
drd_reg register list
*/
DIB dr_dib[] = {
{ &drdio, DRD },
{ &drcio, DRC }
};
#define drd_dib dr_dib[0]
#define drc_dib dr_dib[1]
UNIT drd_unit[] = {
{ UDATA (NULL, 0, 0) },
{ UDATA (NULL, UNIT_DIS, 0) }
};
#define TMR_ORG 0 /* origin timer */
#define TMR_INH 1 /* inhibit timer */
REG drd_reg[] = {
{ ORDATA (IBUF, drd_ibuf, 16) },
{ ORDATA (OBUF, drd_obuf, 16) },
{ FLDATA (CTL, drd.control, 0) },
{ FLDATA (FLG, drd.flag, 0) },
{ ORDATA (BPTR, drd_ptr, 6) },
{ ORDATA (SC, drd_dib.select_code, 6), REG_HRO },
{ ORDATA (DEVNO, drd_dib.select_code, 6), REG_HRO },
{ NULL }
};
MTAB drd_mod[] = {
{ MTAB_XTD | MTAB_VDV, 2u, "SC", "SC", &hp_set_dib, &hp_show_dib, (void *) &dr_dib },
{ MTAB_XTD | MTAB_VDV | MTAB_NMO, ~2u, "DEVNO", "DEVNO", &hp_set_dib, &hp_show_dib, (void *) &dr_dib },
{ 0 }
};
DEVICE drd_dev = {
"DRD", drd_unit, drd_reg, drd_mod,
2, 0, 0, 0, 0, 0,
NULL, NULL, &drc_reset,
NULL, NULL, NULL,
&drd_dib, DEV_DISABLE
};
/* DRC data structures
drc_dev device descriptor
drc_unit unit descriptor
drc_mod unit modifiers
drc_reg register list
*/
UNIT drc_unit = {
UDATA (&drc_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_BUFABLE+
UNIT_MUSTBUF+UNIT_DRUM+UNIT_BINK, DR_SIZE)
};
REG drc_reg[] = {
{ DRDATA (PCNT, drc_pcount, 10), REG_HIDDEN | PV_LEFT },
{ ORDATA (CW, drc_cw, 16) },
{ ORDATA (STA, drc_sta, 16) },
{ FLDATA (RUN, drc_run, 0) },
{ DRDATA (TIME, dr_time, 24), REG_NZ + PV_LEFT },
{ ORDATA (SC, drc_dib.select_code, 6), REG_HRO },
{ ORDATA (DEVNO, drc_dib.select_code, 6), REG_HRO },
{ DRDATA (CAPAC, drc_unit.capac, 24), REG_HRO },
{ NULL }
};
MTAB drc_mod[] = {
{ UNIT_DRUM, 0, "disk", NULL, NULL },
{ UNIT_DRUM, UNIT_DRUM, "drum", NULL, NULL },
{ UNIT_SZ, (SZ_180K << UNIT_V_SZ), NULL, "180K", &dr_set_size },
{ UNIT_SZ, (SZ_360K << UNIT_V_SZ), NULL, "360K", &dr_set_size },
{ UNIT_SZ, (SZ_720K << UNIT_V_SZ), NULL, "720K", &dr_set_size },
{ UNIT_SZ, (SZ_384K << UNIT_V_SZ), NULL, "384K", &dr_set_size },
{ UNIT_SZ, (SZ_512K << UNIT_V_SZ), NULL, "512K", &dr_set_size },
{ UNIT_SZ, (SZ_640K << UNIT_V_SZ), NULL, "640K", &dr_set_size },
{ UNIT_SZ, (SZ_768K << UNIT_V_SZ), NULL, "768K", &dr_set_size },
{ UNIT_SZ, (SZ_896K << UNIT_V_SZ), NULL, "896K", &dr_set_size },
{ UNIT_SZ, (SZ_1024K << UNIT_V_SZ), NULL, "1024K", &dr_set_size },
{ UNIT_SZ, (SZ_1536K << UNIT_V_SZ), NULL, "1536K", &dr_set_size },
{ UNIT_PROT, UNIT_PROT, "protected", "PROTECTED", NULL },
{ UNIT_PROT, 0, "unprotected", "UNPROTECTED", NULL },
{ MTAB_XTD | MTAB_VDV, 0, "TRACKPROT", "TRACKPROT",
&dr_set_prot, &dr_show_prot, NULL },
{ MTAB_XTD | MTAB_VDV, 2u, "SC", "SC", &hp_set_dib, &hp_show_dib, (void *) &dr_dib },
{ MTAB_XTD | MTAB_VDV | MTAB_NMO, ~2u, "DEVNO", "DEVNO", &hp_set_dib, &hp_show_dib, (void *) &dr_dib },
{ 0 }
};
DEVICE drc_dev = {
"DRC", &drc_unit, drc_reg, drc_mod,
1, 8, 21, 1, 8, 16,
NULL, NULL, &drc_reset,
&drc_boot, &drc_attach, NULL,
&drc_dib, DEV_DISABLE
};
/* Data channel I/O signal handler.
The data channel card does not follow the usual interface I/O configuration.
PRL is always asserted, the card does not drive IRQ, FLG, or SKF and does not
respond to IAK. SRQ is driven by the output of the flag flip-flop, which
obeys CLF only. There is no flag buffer. The control flip-flop obeys STC
and CLC. Clearing control clears the flag flip-flop, and setting control
sets the flag flip-flop if the interface is configured for writing. On the
12606B, POPIO and CRS clear the track address register.
Implementation notes:
1. In response to CRS, the 12606B data channel clears only the track address
register; the command channel clears the sector address register and the
direction flip-flop. Under simulation, all three form the control word,
and as CRS is sent to all devices, we simply clear the control word here.
*/
uint32 drdio (DIB *dibptr, IOCYCLE signal_set, uint32 stat_data)
{
int32 t;
IOSIGNAL signal;
IOCYCLE working_set = IOADDSIR (signal_set); /* add ioSIR if needed */
while (working_set) {
signal = IONEXT (working_set); /* isolate next signal */
switch (signal) { /* dispatch I/O signal */
case ioCLF: /* clear flag flip-flop */
drd.flag = CLEAR;
break;
case ioENF: /* enable flag */
drd.flag = SET;
break;
case ioIOI: /* I/O data input */
stat_data = IORETURN (SCPE_OK, drd_ibuf); /* merge in return status */
break;
case ioIOO: /* I/O data output */
drd_obuf = IODATA (stat_data); /* clear supplied status */
break;
case ioCRS: /* control reset */
if (!(drc_unit.flags & UNIT_DRUM)) /* 12606B? */
drc_cw = 0; /* clear control word */
/* fall into CLC handler */
case ioCLC: /* clear control flip-flop */
drd.flag = drd.control = CLEAR; /* clear control and flag */
if (!drc_run) /* cancel curr op */
sim_cancel (&drc_unit);
drc_sta = drc_sta & ~DRS_SAC; /* clear SAC flag */
break;
case ioSTC: /* set control flip-flop */
drd.control = SET; /* set ctl */
if (drc_cw & CW_WR) /* writing? */
drd.flag = SET; /* prime DMA */
drc_sta = 0; /* clr status */
drd_ptr = 0; /* clear sec ptr */
sim_cancel (&drc_unit); /* cancel curr op */
t = CW_GETSEC (drc_cw) - dr_seccntr (sim_gtime());
if (t <= 0) t = t + DR_NUMSC;
sim_activate (&drc_unit, t * DR_NUMWD * dr_time);
break;
case ioSIR: /* set interrupt request */
setstdSRQ (drd); /* set SRQ signal */
break;
default: /* all other signals */
break; /* are ignored */
}
working_set = working_set & ~signal; /* remove current signal from set */
}
return stat_data;
}
/* Command channel I/O signal dispatcher.
The command channel card does not follow the usual interface I/O
configuration. PRL is always asserted, the card does not drive IRQ, FLG, or
SRQ and does not respond to IAK. There are no control, flag, or flag buffer
flip-flops. CLF clears the track origin flip-flop; STF is ignored. The
12606B drives SKF, whereas the 12610B does not. On the 12610B, SFS tests the
Track Origin flip-flop, and SFC tests the Sector Clock Phase (SCP) flip-flop.
Implementation notes:
1. CRS clears the Run Flip-Flop, stopping the current operation. Under
simulation, we allow the data channel signal handler to do this, as the
same operation is invoked by CLC DC, and as CRS is sent to all devices.
2. The command channel cannot interrupt, so there is no SIR handler.
*/
uint32 drcio (DIB *dibptr, IOCYCLE signal_set, uint32 stat_data)
{
uint16 data;
int32 sec;
IOSIGNAL signal;
IOCYCLE working_set = IOADDSIR (signal_set); /* add ioSIR if needed */
while (working_set) {
signal = IONEXT (working_set); /* isolate next signal */
switch (signal) { /* dispatch I/O signal */
case ioCLF: /* clear flag flip-flop */
if (!(drc_unit.flags & UNIT_DRUM)) { /* disk? */
sec = dr_seccntr (sim_gtime ()); /* current sector */
sim_cancel (&drd_unit[TMR_ORG]); /* sched origin tmr */
sim_activate (&drd_unit[TMR_ORG],
(DR_FNUMSC - sec) * DR_NUMWD * dr_time);
}
break;
case ioSFC: /* skip if flag is clear */
if (!(drc_unit.flags & UNIT_DRUM)) /* 12606? */
setSKF (!(CALC_SCP (sim_gtime()))); /* skip if nearing end of sector */
break;
case ioSFS: /* skip if flag is set */
if (!(drc_unit.flags & UNIT_DRUM)) /* 12606? */
setSKF (!sim_is_active (&drd_unit[TMR_ORG])); /* skip if origin seen */
break;
case ioIOI: /* I/O data input */
data = (uint16) drc_sta; /* static bits */
if (!(drc_unit.flags & UNIT_PROT) || /* not protected? */
(CW_GETTRK(drc_cw) >= drc_pcount)) /* or not in range? */
data = data | DRS_WEN; /* set wrt enb status */
if (drc_unit.flags & UNIT_ATT) { /* attached? */
data = data | (uint16) (dr_seccntr (sim_gtime()) << DRS_V_NS) | DRS_RDY;
if (sim_is_active (&drc_unit)) /* op in progress? */
data = data | DRS_BSY;
if (CALC_SCP (sim_gtime())) /* SCP ff set? */
data = data | DRS_SEC; /* set sector flag */
if (sim_is_active (&drd_unit[TMR_INH]) && /* inhibit timer on? */
!(drc_cw & CW_WR))
data = data | DRS_RIF; /* set read inh flag */
}
stat_data = IORETURN (SCPE_OK, data); /* merge in return status */
break;
case ioIOO: /* I/O data output */
if (!(drc_unit.flags & UNIT_DRUM)) { /* disk? */
sim_cancel (&drd_unit[TMR_INH]); /* schedule inhibit timer */
sim_activate (&drd_unit[TMR_INH], DR_FTIME * DR_NUMWD);
}
drc_cw = IODATA (stat_data); /* get control word */
break;
default: /* all other signals */
break; /* are ignored */
}
working_set = working_set & ~signal; /* remove current signal from set */
}
return stat_data;
}
/* Unit service */
t_stat drc_svc (UNIT *uptr)
{
int32 trk, sec;
uint32 da;
uint16 *bptr = (uint16 *) uptr->filebuf;
if ((uptr->flags & UNIT_ATT) == 0) {
drc_sta = DRS_ABO;
return SCPE_OK;
}
trk = CW_GETTRK (drc_cw);
sec = CW_GETSEC (drc_cw);
da = ((trk * DR_NUMSC) + sec) * DR_NUMWD;
drc_sta = drc_sta | DRS_SAC;
drc_run = 1; /* set run ff */
if (drc_cw & CW_WR) { /* write? */
if ((da < uptr->capac) && (sec < DR_NUMSC)) {
bptr[da + drd_ptr] = (uint16) drd_obuf;
if (((uint32) (da + drd_ptr)) >= uptr->hwmark)
uptr->hwmark = da + drd_ptr + 1;
}
drd_ptr = dr_incda (trk, sec, drd_ptr); /* inc disk addr */
if (drd.control) { /* dch active? */
drdio (&drd_dib, ioENF, 0); /* set SRQ */
sim_activate (uptr, dr_time); /* sched next word */
}
else { /* done */
if (drd_ptr) /* need to fill? */
for ( ; drd_ptr < DR_NUMWD; drd_ptr++)
bptr[da + drd_ptr] = (uint16) drd_obuf; /* fill with last word */
if (!(drc_unit.flags & UNIT_DRUM)) /* disk? */
drc_sta = drc_sta | DRS_PER; /* parity bit sets on write */
drc_run = 0; /* clear run ff */
}
} /* end write */
else { /* read */
if (drd.control) { /* dch active? */
if ((da >= uptr->capac) || (sec >= DR_NUMSC)) drd_ibuf = 0;
else drd_ibuf = bptr[da + drd_ptr];
drd_ptr = dr_incda (trk, sec, drd_ptr);
drdio (&drd_dib, ioENF, 0); /* set SRQ */
sim_activate (uptr, dr_time); /* sched next word */
}
else drc_run = 0; /* clear run ff */
}
return SCPE_OK;
}
/* Increment current disk address */
int32 dr_incda (int32 trk, int32 sec, int32 ptr)
{
ptr = ptr + 1; /* inc pointer */
if (ptr >= DR_NUMWD) { /* end sector? */
ptr = 0; /* new sector */
sec = sec + 1; /* adv sector */
if (sec >= DR_NUMSC) { /* end track? */
sec = 0; /* new track */
trk = trk + 1; /* adv track */
if (trk >= MAX_TRK) trk = 0; /* wraps at max */
}
drc_cw = (drc_cw & CW_WR) | CW_PUTTRK (trk) | CW_PUTSEC (sec);
}
return ptr;
}
/* Read the sector counter
The hardware sector counter contains the number of the next sector that will
pass under the heads (so it is one ahead of the current sector). For the
duration of the last sector of the track, the sector counter contains 90 for
the 12606 and 0 for the 12610. The sector counter resets to 0 at track
origin and increments at the start of the first sector. Therefore, the
counter value ranges from 0-90 for the 12606 and 0-31 for the 12610. The 0
state is quite short in the 12606 and long in the 12610, relative to the
other sector counter states.
The simulated sector counter is calculated from the simulation time, based on
the time per word and the number of words per track.
*/
int32 dr_seccntr (double simtime)
{
int32 curword;
curword = (int32) fmod (simtime / (double) dr_time,
(double) (DR_NUMWD * DR_NUMSC + DR_OVRHEAD));
if (curword <= DR_OVRHEAD) return 0;
else return ((curword - DR_OVRHEAD) / DR_NUMWD +
((drc_unit.flags & UNIT_DRUM)? 0: 1));
}
/* Reset routine */
t_stat drc_reset (DEVICE *dptr)
{
DIB *dibptr = (DIB *) dptr->ctxt; /* DIB pointer */
hp_enbdis_pair (dptr, /* make pair cons */
(dptr == &drd_dev)? &drc_dev: &drd_dev);
if (sim_switches & SWMASK ('P')) { /* power-on reset? */
drd_ptr = 0; /* clear sector pointer */
drc_sta = drc_cw = 0; /* clear controller state variables */
}
IOPRESET (dibptr); /* PRESET device (does not use PON) */
sim_cancel (&drc_unit);
sim_cancel (&drd_unit[TMR_ORG]);
sim_cancel (&drd_unit[TMR_INH]);
return SCPE_OK;
}
/* Attach a drive unit.
The specified file is attached to the indicated drive unit. If a new file is
specified, the file is initialized to its capacity by setting the high-water
mark to the last byte in the file.
*/
t_stat drc_attach (UNIT *uptr, CONST char *cptr)
{
t_stat result;
const int32 sz = sz_tab [DR_GETSZ (uptr->flags)];
if (sz == 0)
return SCPE_IERR;
else
uptr->capac = sz;
result = attach_unit (uptr, cptr); /* attach the drive */
if (result == SCPE_OK && (sim_switches & SWMASK ('N'))) /* if the attach was successful and a new image was specified */
uptr->hwmark = (uint32) uptr->capac; /* then set the high-water mark to the last byte */
return result; /* return the result of the attach */
}
/* Set protected track count */
t_stat dr_set_prot (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
{
int32 count;
t_stat status;
if (cptr == NULL)
return SCPE_ARG;
count = (int32) get_uint (cptr, 10, 768, &status);
if (status != SCPE_OK)
return status;
else switch (count) {
case 1:
case 2:
case 4:
case 8:
case 16:
case 32:
case 64:
case 128:
drc_pcount = count;
break;
case 256:
case 512:
case 768:
if (drc_unit.flags & UNIT_DRUM)
drc_pcount = count;
else return SCPE_ARG;
break;
default:
return SCPE_ARG;
}
return SCPE_OK;
}
/* Show protected track count */
t_stat dr_show_prot (FILE *st, UNIT *uptr, int32 val, CONST void *desc)
{
fprintf (st, "protected tracks=%d", drc_pcount);
return SCPE_OK;
}
/* Set size routine */
t_stat dr_set_size (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
{
int32 sz;
int32 szindex;
if (val < 0) return SCPE_IERR;
if ((sz = sz_tab[szindex = DR_GETSZ (val)]) == 0) return SCPE_IERR;
if (uptr->flags & UNIT_ATT) return SCPE_ALATT;
uptr->capac = sz;
if (szindex & UNIT_DRUM) dr_time = DR_DTIME; /* drum */
else {
dr_time = DR_FTIME; /* disk */
if (drc_pcount > 128) drc_pcount = 128; /* max prot track count */
}
return SCPE_OK;
}
/* 277x fixed disc/drum bootstrap loaders (BBDL).
The Basic Binary Disc Loader (BBDL) consists of two programs. The program
starting at address x7700 loads absolute paper tapes into memory. The
program starting at address x7760 loads a disc-resident bootstrap from the
277x fixed-head disc/drum into memory. The S register setting does not
affect loader operation.
Entering a LOAD DRC or BOOT DRC command loads the BBDL into memory and
executes the disc portion starting at x7760. The bootstrap issues a CLC 0,C
to clear the disc track and sector address registers and then sets up a
64-word read from track 0 sector 0 to memory locations 0-77 octal. It then
stores a JMP * instruction in location 77, starts the read, and jumps to
location 77. The JMP * causes the CPU to loop until the last word read from
the disc extension overlays location 77 which, typically, would be a JMP
instruction to the start of the disc-resident bootstrap. The success or
failure of the transfer is not checked.
The HP 1000 does not support the 277x drives, so there is no 1000 boot loader
ROM for these peripherals. Attempting to LOAD DRC or BOOT DRC while the CPU
is configured as a 1000 will be rejected.
Implementation notes:
1. After the BBDL is loaded into memory, the paper tape portion may be
executed manually by setting the P register to the starting address
(x7700).
2. For compatibility with the cpu_copy_loader routine, the BBDL has been
altered from the standard HP version. The device I/O instructions are
modified to address select codes 10 and 11.
3. The "HP 20854A Timeshared BASIC/2000, Level F System Operator's Manual"
(HP 02000-90074, November 1974) lists an IBL procedure for booting a 21MX
(i.e., 1000 M-Series) CPU from the fixed-head disc. However, there is no
evidence that a fixed-head disc boot loader ROM ever existed. Moreover,
the procedure listed is suspicious, as it specifies the command channel
select code instead of the data channel select code, so I/O instruction
configuration would be incorrect. Also, the equivalent 2100 boot
procedure printed adjacently gives the wrong BBDL starting address (it is
listed correctly in the 1973 version of the manual). Actually, the 21MX
and 2100 procedures appear to be verbatim copies of the moving-head disc
boot procedures listed two pages earlier. Consequently, it would appear
that 21MX-based 2000 F TSB systems with fixed-head drives must boot from
paper tape.
*/
static const LOADER_ARRAY dr_loaders = {
{ /* HP 21xx Basic Binary Disc Loader (BBDL) */
060, /* loader starting index */
056, /* DMA index */
055, /* FWA index */
{ 0107700, /* 77700: ST2 CLC 0,C START OF PAPER TAPE LOADER */
0002401, /* 77701: CLA,RSS */
0063726, /* 77702: CONT2 LDA CM21 */
0006700, /* 77703: CLB,CCE */
0017742, /* 77704: JSB READ2 */
0007306, /* 77705: LEDR2 CMB,CCE,INB,SZB */
0027713, /* 77706: JMP RECL2 */
0002006, /* 77707: EOTC2 INA,SZA */
0027703, /* 77710: JMP CONT2+1 */
0102077, /* 77711: HLT 77B */
0027700, /* 77712: JMP ST2 */
0077754, /* 77713: RECL2 STB CNT2 */
0017742, /* 77714: JSB READ2 */
0017742, /* 77715: JSB READ2 */
0074000, /* 77716: STB A */
0077757, /* 77717: STB ADR11 */
0067757, /* 77720: SUCID LDB ADR11 */
0047755, /* 77721: ADB MAXAD */
0002040, /* 77722: SEZ */
0027740, /* 77723: JMP RESCU */
0017742, /* 77724: LOAD2 JSB READ2 */
0040001, /* 77725: ADA B */
0177757, /* 77726: CM21 STB ADR11,I */
0037757, /* 77727: ISZ ADR11 */
0000040, /* 77730: CLE */
0037754, /* 77731: ISZ CNT2 */
0027720, /* 77732: JMP SUCID */
0017742, /* 77733: JSB READ2 */
0054000, /* 77734: CPB A */
0027702, /* 77735: JMP CONT2 */
0102011, /* 77736: HLT 11B */
0027700, /* 77737: JMP ST2 */
0102055, /* 77740: RESCU HLT 55B */
0027700, /* 77741: JMP ST2 */
0000000, /* 77742: READ2 NOP */
0006600, /* 77743: CLB,CME */
0103710, /* 77744: RED2 STC PR,C */
0102310, /* 77745: SFS PR */
0027745, /* 77746: JMP *-1 */
0107410, /* 77747: MIB PR,C */
0002041, /* 77750: SEZ,RSS */
0127742, /* 77751: JMP READ2,I */
0005767, /* 77752: BLF,CLE,BLF */
0027744, /* 77753: JMP RED2 */
0000000, /* 77754: CNT2 NOP */
0000000, /* 77755: MAXAD NOP */
0020010, /* 77756: CWORD ABS 20000B+DC */
0000000, /* 77757: ADR11 NOP */
0107700, /* 77760: DLDR CLC 0,C START OF FIXED DISC LOADER */
0063756, /* 77761: LDA CWORD */
0102606, /* 77762: OTA 6 */
0002700, /* 77763: CLA,CCE */
0102611, /* 77764: OTA CC */
0001500, /* 77765: ERA */
0102602, /* 77766: OTA 2 */
0063777, /* 77767: LDA WRDCT */
0102702, /* 77770: STC 2 */
0102602, /* 77771: OTA 2 */
0103706, /* 77772: STC 6,C */
0102710, /* 77773: STC DC */
0067776, /* 77774: LDB JMP77 */
0074077, /* 77775: STB 77B */
0024077, /* 77776: JMP77 JMP 77B */
0177700 } }, /* 77777: WRDCT OCT -100 */
{ /* HP 1000 Loader ROM does not exist */
IBL_NA, /* loader starting index */
IBL_NA, /* DMA index */
IBL_NA, /* FWA index */
{ 0 } }
};
/* Device boot routine.
This routine is called by the LOAD DRC and BOOT DRC commands to copy the
device bootstrap into the upper 64 words of the logical address space. On
entry, the "unitno" parameter is checked to ensure that it is 0, as the
bootstrap only loads from unit 0. Then the BBDL is loaded into memory, the
disc portion is configured for the DRD/DRC select code pair, and the paper
tape portion is configured for the select code of the paper tape reader.
Implementation notes:
1. The fixed-head disc/drum device is not supported on the HP 1000, so this
routine cannot be called by a BOOT CPU or LOAD CPU command.
2. In hardware, the BBDL was hand-configured for the disc and paper tape
reader select codes when it was installed on a given system. Under
simulation, the LOAD and BOOT commands automatically configure the BBDL
to the current select codes of the PTR and DR devices.
*/
t_stat drc_boot (int32 unitno, DEVICE *dptr)
{
if (unitno != 0) /* a BOOT DRC for a non-zero unit */
return SCPE_NOFNC; /* is rejected as unsupported */
else /* otherwise this is a BOOT/LOAD DRC */
return cpu_copy_loader (dr_loaders, drd_dib.select_code, /* so copy the boot loader to memory */
IBL_S_NOCLEAR, IBL_S_NOSET); /* and preserve the S register */
}