44cc9f3f6d
Custom TTL design by Marvin Minsky. There are two displays: one raster scan for bitmapped characters, and another random scan for vector graphics. There is also a keyboard, and a UART for talking to a host computer. The computer is normally booted off a ROM which reads and starts a secondary loader from the UART. The loader is responsible for reading the payload, which comes in checksummed blocks. The LOAD command accepts files in same format.
284 lines
6.9 KiB
C
284 lines
6.9 KiB
C
/* imlac_dpy.c: TT2500 display.
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Copyright (c) 2020, Lars Brinkhoff
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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LARS BRINKHOFF BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of Lars Brinkhoff shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from Lars Brinkhoff.
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*/
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#include <string.h>
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#include "tt2500_defs.h"
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/* Debug */
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#define DBG_REG 0001
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#define DBG_VEC 0002
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#define DBG_TXT 0004
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#define DBG_60HZ 0010
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#define DBG_2KHZ 0020
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/* DSR */
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#define DSR_VEC 0160000
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#define DSR_TXT 0006000
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static t_stat dpy_60hz_svc (UNIT *uptr);
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static t_stat dpy_2khz_svc (UNIT *uptr);
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static t_stat dpy_reset (DEVICE *dptr);
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static void dpy_text_line (void);
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static uint8 black[4096], green[4096];
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uint8 FONT[4096];
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uint8 LINE[73];
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static uint16 YCOR;
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static uint16 XCOR;
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static uint16 SCROLL;
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uint16 DSR = 0;
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static uint16 ROW = 0;
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static uint16 COL = 0;
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int dpy_quit = FALSE;
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/* DSR
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160000 Vector beam: 0=on, 7=off.
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10000 TV on.
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6000 Color mode.
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0000
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2000 Dark background.
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4000
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6000
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tv-off tv-off-const 1 001 (unused)
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tv-green-const 2 010 (unused)
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tv-blank green-blank-const 4 100 (flash)
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tv-active tv-dark-const 5 101 (normal) "green chars on field ebony"
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dark-blank-const 7 111 (unused)
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*/
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/* Function declaration. */
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static uint16 dpy_read (uint16);
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static void dpy_write (uint16, uint16);
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static UNIT dpy_unit = {
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UDATA (dpy_2khz_svc, UNIT_IDLE, 0)
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};
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static BITFIELD dsr_bits[] = {
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BITNCF(10),
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BITF(TXT,2),
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BITF(ON,1),
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BITF(VEC,3),
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ENDBITS
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};
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static REG dpy_reg[] = {
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{ ORDATAD (YCOR, YCOR, 9, "Y coordinate") },
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{ ORDATAD (XCOR, XCOR, 9, "X coordinate") },
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{ ORDATAD (SCROLL, SCROLL, 16, "Scroll") },
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{ ORDATADF (DSR, DSR, 16, "Status register", dsr_bits ) },
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{ NULL }
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};
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static DEBTAB dpy_deb[] = {
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{ "REG", DBG_REG },
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{ "VEC", DBG_VEC },
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{ "TXT", DBG_TXT },
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{ "60HZ", DBG_60HZ },
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{ "2KHZ", DBG_2KHZ },
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{ NULL, 0 }
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};
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static TTDEV dpy_ttdev = {
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{ REG_YCOR, REG_XCOR, REG_SCROLL, REG_DSR },
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dpy_read,
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dpy_write,
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};
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DEVICE dpy_dev = {
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"DPY", &dpy_unit, dpy_reg, NULL,
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1, 8, 16, 1, 8, 16,
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NULL, NULL, dpy_reset,
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NULL, NULL, NULL, &dpy_ttdev, DEV_DEBUG, 0, dpy_deb,
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NULL, NULL, NULL, NULL, NULL, NULL
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};
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/* To ensure the two clocks are always in sync, dpy_60hz_svc is called
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from dpy_2khz_svc. */
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static t_stat dpy_60hz_svc (UNIT *uptr)
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{
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sim_debug (DBG_60HZ, &dpy_dev, "60 Hz interrupt\n");
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flag_on (INT_60HZ);
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tv_refresh ();
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return SCPE_OK;
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}
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static t_stat dpy_2khz_svc (UNIT *uptr)
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{
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static int n = 0;
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t_stat r;
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/* 30 text lines, plus one extra for the page refresh interrupt, per
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60 Hz page comes to 538 microseconds. */
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r = sim_activate_after (uptr, 538);
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if (r != SCPE_OK)
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return r;
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if (++n == 31) {
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n = 0;
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return dpy_60hz_svc (&dpy_unit);
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}
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sim_debug (DBG_2KHZ, &dpy_dev, "2 kHz interrupt\n");
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dpy_text_line ();
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flag_on (INT_2KHZ);
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return SCPE_OK;
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}
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static uint16 dpy_read (uint16 reg)
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{
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uint16 data = 0;
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switch (reg) {
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case REG_YCOR:
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data = YCOR;
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sim_debug (DBG_REG, &dpy_dev, "%06o <= YCOR\n", data);
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break;
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case REG_XCOR:
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data = XCOR;
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sim_debug (DBG_REG, &dpy_dev, "%06o <= XCOR\n", data);
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break;
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case REG_SCROLL:
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data = SCROLL;
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sim_debug (DBG_REG, &dpy_dev, "%06o <= SCROLL\n", data);
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break;
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case REG_DSR:
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data = DSR;
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sim_debug (DBG_REG, &dpy_dev, "DSR <= %06o\n", data);
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break;
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}
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return data;
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}
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static void dpy_write (uint16 reg, uint16 data)
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{
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switch (reg) {
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case REG_YCOR:
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sim_debug (DBG_REG, &dpy_dev, "YCOR <= %06o\n", data);
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YCOR = data;
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break;
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case REG_XCOR:
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sim_debug (DBG_REG, &dpy_dev, "XCOR <= %06o\n", data);
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XCOR = data;
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break;
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case REG_SCROLL:
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sim_debug (DBG_REG, &dpy_dev, "SCROLL <= %06o\n", data);
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SCROLL = data;
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flag_off (INT_60HZ);
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COL = 0;
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ROW = 29;
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break;
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case REG_DSR:
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sim_debug (DBG_REG, &dpy_dev, "DSR <= %06o\n", data);
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DSR = data;
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break;
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}
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}
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static t_stat dpy_reset (DEVICE *dptr)
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{
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memset (black, 0, sizeof black);
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memset (green, 0377, sizeof green);
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sim_activate_abs (&dpy_unit, 0);
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return SCPE_OK;
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}
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void dpy_magic (uint16 xr, uint16 *r2, uint16 *r3, uint16 r4, uint16 r5)
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{
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uint32 x = *r2, y = *r3;
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uint16 x0, y0, x1, y1, dx, dy;
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sim_debug (DBG_VEC, &dpy_dev, "MAGIC %06o\n", xr);
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sim_debug (DBG_VEC, &dpy_dev, "X,YCOR = %06o, %06o\n", XCOR, YCOR);
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sim_debug (DBG_VEC, &dpy_dev, "X,YPOS = %06o, %06o\n", *r2, *r3);
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sim_debug (DBG_VEC, &dpy_dev, "SIN,COS = %06o, %06o\n", r4, r5);
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x0 = x1 = XCOR;
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y0 = y1 = YCOR;
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dx = (r4 & 0100000) ? -1 : 1;
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dy = (r5 & 0100000) ? -1 : 1;
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flag_on (STAR_WRAP);
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while (xr & 04000) {
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sim_interval--;
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x = cpu_alu (0, ALU_ADD, x, r4);
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if (V)
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x1 = (XCOR += dx);
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sim_interval--;
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y = cpu_alu (0, ALU_ADD, y, r5);
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if (V)
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y1 = (YCOR += dy);
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if ((XCOR & 01000) != 0 || (YCOR & 01000) != 0) {
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x1 -= dx;
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y1 -= dy;
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flag_off (STAR_WRAP);
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break;
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}
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xr++;
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}
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crt_line (x0, y0, x1, y1, DSR >> 13);
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*r2 = x;
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*r3 = y;
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}
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void dpy_chartv (uint16 data)
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{
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sim_debug (DBG_TXT, &dpy_dev, "CHARTV %03o (%06o)\n", data & 0377, data);
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flag_off (INT_2KHZ);
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memmove (LINE, LINE + 1, 72);
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LINE[72] = (uint8)data;
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}
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static void dpy_text_line (void)
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{
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uint8 *font;
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if ((DSR & 016000) == 010000)
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font = green;
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else if (DSR & 010000)
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font = FONT;
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else
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font = black;
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tv_line (ROW, LINE, font);
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if (dpy_dev.dctrl)
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tv_refresh ();
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ROW++;
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if (ROW == 30)
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ROW = 0;
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}
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void dpy_quit_callback (void)
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{
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dpy_quit = TRUE;
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}
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