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PDP8: Add Type 34 display support.

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This commit is contained in:
Lars Brinkhoff
2025-08-28 10:41:22 -10:00
committed by Mark Pizzolato
parent b305252bff
commit 02ebdd38d5
6 changed files with 214 additions and 4 deletions
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1
PDP8/pdp8_defs.h
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@@ -107,6 +107,7 @@ typedef struct {
#define DEV_PTP 002 /* paper tape punch */
#define DEV_TTI 003 /* console input */
#define DEV_TTO 004 /* console output */
#define DEV_DPY 005 /* Type 34 display */
#define DEV_CLK 013 /* clock */
#define DEV_TSC 036
#define DEV_KJ8 040 /* extra terminals */

153
PDP8/pdp8_dpy.c Normal file
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@@ -0,0 +1,153 @@
#ifdef USE_DISPLAY
/* pdp8_dpy.c: Type 34 point-plotting display
Copyright (c) 2025, Lars Brinkhoff
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.
*/
#include "pdp8_defs.h"
#include "display/display.h"
#include "sim_video.h"
/* Run a Type 34 cycle every this many PDP-8 "cycle" times. */
#define DPY_DELAY 1
/* Memory cycle time. */
#define MEMORY_CYCLE 1
#define CYCLE_US (MEMORY_CYCLE*(DPY_DELAY*2+1))
t_stat dpy_svc(UNIT *uptr);
int32 dpy_iot (int32 IR, int32 AC);
t_stat dpy_reset(DEVICE *dptr);
t_stat dpy_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cptr);
const char *dpy_description (DEVICE *dptr);
DIB dpy_dib = { DEV_DPY, 2, { &dpy_iot, &dpy_iot } };
UNIT dpy_unit = {
UDATA (&dpy_svc, UNIT_IDLE, 0), 0
};
static t_bool dpy_quit = FALSE;
static uint16 dpy_x, dpy_y;
static void dpy_quit_callback (void)
{
dpy_quit = TRUE;
}
DEVICE dpy_dev = {
"DPY", &dpy_unit, NULL, NULL,
1, 8, 16, 1, 8, 16,
NULL, NULL, &dpy_reset,
NULL, NULL, NULL,
&dpy_dib, DEV_DIS | DEV_DISABLE, 0,
NULL, NULL, NULL, NULL, NULL, NULL,
&dpy_description
};
t_stat
dpy_svc(UNIT *uptr)
{
#ifdef USE_DISPLAY
display_age (100, 0);
sim_activate_after (uptr, 100);
if (dpy_quit) {
dpy_quit = FALSE;
return SCPE_STOP;
}
#endif
return SCPE_OK;
}
/* Type 34: IOT routine */
int32 dpy_iot (int32 IR, int32 AC)
{
switch (IR & 071) {
case 051: /* DCX */
dpy_x = 0;
break;
case 061: /* DCY */
dpy_y = 0;
break;
}
switch (IR & 072) {
case 052: /* DXL */
dpy_x |= AC & 01777;
break;
case 062: /* DYL */
dpy_y |= AC & 01777;
break;
}
switch (IR & 004) {
case 004: /* DIX, DIY */
#ifdef USE_DISPLAY
if (dpy_dev.flags & DEV_DIS)
break;
display_point (dpy_x, dpy_y, DISPLAY_INT_MAX, 0);
#endif
break;
}
return AC;
}
t_stat
dpy_reset(DEVICE *dptr)
{
#ifdef USE_DISPLAY
if (dptr->flags & DEV_DIS || (sim_switches & SWMASK('P')) != 0) {
display_close (dptr);
sim_cancel (&dpy_unit);
} else {
display_reset ();
display_init (DIS_TYPE30, 1, dptr);
vid_register_quit_callback (&dpy_quit_callback);
sim_activate_abs (&dpy_unit, 0);
}
#endif
return SCPE_OK;
}
const char *dpy_description (DEVICE *dptr)
{
return "Type 34 vector display controller";
}
void
cpu_get_switches(unsigned long *p1, unsigned long *p2)
{
}
void
cpu_set_switches(unsigned long w1, unsigned long w2)
{
}
#else /* USE_DISPLAY not defined */
char pdp8_dpy_unused; /* sometimes empty object modules cause problems */
#endif /* USE_DISPLAY not defined */

11
PDP8/pdp8_sys.c
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@@ -67,6 +67,9 @@ extern DEVICE df_dev, rf_dev;
extern DEVICE dt_dev, td_dev;
extern DEVICE mt_dev, ct_dev;
extern DEVICE ttix_dev, ttox_dev;
#ifdef USE_DISPLAY
extern DEVICE dpy_dev;
#endif
extern REG cpu_reg[];
extern uint16 M[];
@@ -114,6 +117,10 @@ DEVICE *sim_devices[] = {
&td_dev,
&mt_dev,
&ct_dev,
&ct_dev,
#ifdef USE_DISPLAY
&dpy_dev,
#endif
NULL
};
@@ -332,6 +339,8 @@ static const char *opcode[] = {
"PCE", "PSF", "PCF", "PPC", "PLS",
"KCF", "KSF", "KCC", "KRS", "KIE", "KRB", /* console */
"TLF", "TSF", "TCF", "TPC", "SPI", "TLS",
"DCX", "DXL", "DIX", "DXS",
"DCY", "DYL", "DIY", "DYS",
"SBE", "SPL", "CAL", /* power fail */
"CLEI", "CLDI", "CLSC", "CLLE", "CLCL", "CLSK", /* clock */
"CINT", "RDF", "RIF", "RIB", /* mem mmgt */
@@ -400,6 +409,8 @@ static const int32 opc_val[] = {
06020+I_NPN, 06021+I_NPN, 06022+I_NPN, 06024+I_NPN, 06026+I_NPN,
06030+I_NPN, 06031+I_NPN, 06032+I_NPN, 06034+I_NPN, 06035+I_NPN, 06036+I_NPN,
06040+I_NPN, 06041+I_NPN, 06042+I_NPN, 06044+I_NPN, 06045+I_NPN, 06046+I_NPN,
06051+I_NPN, 06053+I_NPN, 06054+I_NPN, 06057+I_NPN,
06061+I_NPN, 06063+I_NPN, 06064+I_NPN, 06067+I_NPN,
06101+I_NPN, 06102+I_NPN, 06103+I_NPN,
06131+I_NPN, 06132+I_NPN, 06133+I_NPN, 06135+I_NPN, 06136+I_NPN, 06137+I_NPN,
06204+I_NPN, 06214+I_NPN, 06224+I_NPN, 06234+I_NPN,

14
PDP8/tests/dpy_test.do Normal file
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@@ -0,0 +1,14 @@
DEPOSIT 200 CLA
DEPOSIT 201 TAD 207
;Display one point in the center: (1000,1000)
DEPOSIT 202 DXL
DEPOSIT 203 DYS
DEPOSIT 204 TAD 210
;Display another point mid-way to the right: (1400,1000)
DEPOSIT 205 DXS
DEPOSIT 206 JMP 200
DEPOSIT 207 1000
DEPOSIT 210 400
SET DPY ENABLED
GO 200