Added Toshiba T3100e emulation. Patch from John Elliott.
This commit is contained in:
SarahW
parent
c28490cc2f
commit
5d5fa1402a
21 changed files with 1277 additions and 26 deletions
606
src/vid_t3100e.c
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606
src/vid_t3100e.c
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/* Emulate the Toshiba 3100e plasma display. This display has a fixed 640x400
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* resolution. */
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#include <stdlib.h>
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#include "ibm.h"
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#include "device.h"
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#include "io.h"
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#include "mem.h"
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#include "timer.h"
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#include "video.h"
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#include "vid_t3100e.h"
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#define T3100E_XSIZE 640
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#define T3100E_YSIZE 400
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/* T3100e CRTC regs (from the ROM):
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*
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* Selecting a character height of 3 seems to be sufficient to convert the
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* 640x200 graphics mode to 640x400 (and, by analogy, 320x200 to 320x400).
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*
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*
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* Horiz-----> Vert------> I ch
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* 38 28 2D 0A 1F 06 19 1C 02 07 06 07 CO40
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* 71 50 5A 0A 1F 06 19 1C 02 07 06 07 CO80
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* 38 28 2D 0A 7F 06 64 70 02 01 06 07 Graphics
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* 61 50 52 0F 19 06 19 19 02 0D 0B 0C MONO
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* 2D 28 22 0A 67 00 64 67 02 03 06 07 640x400
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*/
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void updatewindowsize(int x, int y);
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/* Mapping of attributes to colours */
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static uint32_t amber, black;
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static uint32_t blinkcols[256][2];
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static uint32_t normcols[256][2];
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/* Video options set by the motherboard; they will be picked up by the card
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* on the next poll.
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*
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* Bit 3: Disable built-in video (for add-on card)
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* Bit 2: Thin font
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* Bits 0,1: Font set (not currently implemented)
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*/
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static uint8_t st_video_options;
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void t3100e_video_options_set(uint8_t options)
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{
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st_video_options = options;
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}
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typedef struct t3100e_t
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{
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mem_mapping_t mapping;
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uint8_t cga_crtc[32]; /* The CRTC as the host PC sees it. Most
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* of the registers are ignored by the plasma
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* display. */
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int cga_crtcreg; /* Current CRTC register */
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uint8_t cga_ctrl; /* CGA control register */
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uint8_t cga_colour; /* CGA colour register */
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uint8_t cga_stat; /* CGA status (IN 0x3DA) */
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int font; /* Current font, 0-3 */
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int enabled; /* Hardware enabled, 0 or 1 */
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int dispontime, dispofftime;
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int vidtime;
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int linepos, displine;
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int vc;
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int dispon, blink;
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int vsynctime;
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uint8_t video_options;
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uint8_t *vram;
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} t3100e_t;
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void t3100e_recalctimings(t3100e_t *t3100e);
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void t3100e_write(uint32_t addr, uint8_t val, void *p);
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uint8_t t3100e_read(uint32_t addr, void *p);
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void t3100e_out(uint16_t addr, uint8_t val, void *p)
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{
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t3100e_t *t3100e = (t3100e_t *)p;
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switch (addr)
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{
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/* Emulated CRTC, register select */
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case 0x3d0: case 0x3d2: case 0x3d4: case 0x3d6:
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t3100e->cga_crtcreg = val & 31;
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break;
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/* Emulated CRTC, value */
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case 0x3d1: case 0x3d3: case 0x3d5: case 0x3d7:
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t3100e->cga_crtc[t3100e->cga_crtcreg] = val;
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t3100e_recalctimings(t3100e);
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return;
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/* CGA control register */
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case 0x3D8:
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t3100e->cga_ctrl = val;
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return;
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/* CGA colour register */
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case 0x3D9:
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t3100e->cga_colour = val;
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return;
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}
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}
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uint8_t t3100e_in(uint16_t addr, void *p)
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{
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t3100e_t *t3100e = (t3100e_t *)p;
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switch (addr)
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{
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case 0x3d0: case 0x3d2: case 0x3d4: case 0x3d6:
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return t3100e->cga_crtcreg;
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case 0x3d1: case 0x3d3: case 0x3d5: case 0x3d7:
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return t3100e->cga_crtc[t3100e->cga_crtcreg];
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case 0x3d8:
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return t3100e->cga_ctrl;
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case 0x3d9:
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return t3100e->cga_colour;
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case 0x3da:
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return t3100e->cga_stat;
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}
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return 0xff;
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}
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void t3100e_write(uint32_t addr, uint8_t val, void *p)
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{
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t3100e_t *t3100e = (t3100e_t *)p;
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egawrites++;
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// pclog("CGA_WRITE %04X %02X\n", addr, val);
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t3100e->vram[addr & 0x7fff] = val;
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cycles -= 4;
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}
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uint8_t t3100e_read(uint32_t addr, void *p)
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{
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t3100e_t *t3100e = (t3100e_t *)p;
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egareads++;
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cycles -= 4;
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// pclog("CGA_READ %04X\n", addr);
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return t3100e->vram[addr & 0x7fff];
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}
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void t3100e_recalctimings(t3100e_t *t3100e)
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{
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double disptime;
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double _dispontime, _dispofftime;
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disptime = 651;
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_dispontime = 640;
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_dispofftime = disptime - _dispontime;
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t3100e->dispontime = (int)(_dispontime * (1 << TIMER_SHIFT));
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t3100e->dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT));
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}
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/* Draw a row of text in 80-column mode */
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void t3100e_text_row80(t3100e_t *t3100e)
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{
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uint32_t cols[2];
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int x, c;
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uint8_t chr, attr;
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int drawcursor;
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int cursorline;
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int bold;
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int blink;
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uint16_t addr;
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uint8_t sc;
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uint16_t ma = (t3100e->cga_crtc[13] | (t3100e->cga_crtc[12] << 8)) & 0x7fff;
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uint16_t ca = (t3100e->cga_crtc[15] | (t3100e->cga_crtc[14] << 8)) & 0x7fff;
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sc = (t3100e->displine) & 15;
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addr = ((ma & ~1) + (t3100e->displine >> 4) * 80) * 2;
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ma += (t3100e->displine >> 4) * 80;
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if ((t3100e->cga_crtc[10] & 0x60) == 0x20)
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{
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cursorline = 0;
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}
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else
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{
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cursorline = ((t3100e->cga_crtc[10] & 0x0F)*2 <= sc) &&
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((t3100e->cga_crtc[11] & 0x0F)*2 >= sc);
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}
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for (x = 0; x < 80; x++)
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{
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chr = t3100e->vram[(addr + 2 * x) & 0x7FFF];
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attr = t3100e->vram[(addr + 2 * x + 1) & 0x7FFF];
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drawcursor = ((ma == ca) && cursorline &&
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(t3100e->cga_ctrl & 8) && (t3100e->blink & 16));
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blink = ((t3100e->blink & 16) && (t3100e->cga_ctrl & 0x20) &&
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(attr & 0x80) && !drawcursor);
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/* XXX We should also be taking account of bits 0,1 of
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* options to select one of the four ROM character sets;
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* but these are not currently emulated. */
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if (t3100e->video_options & 4)
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bold = (attr & 8) ? chr + 256 : chr;
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else
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bold = (attr & 8) ? chr : chr + 256;
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if (t3100e->cga_ctrl & 0x20) /* Blink */
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{
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cols[1] = blinkcols[attr][1];
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cols[0] = blinkcols[attr][0];
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if (blink) cols[1] = cols[0];
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}
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else
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{
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cols[1] = normcols[attr][1];
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cols[0] = normcols[attr][0];
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}
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if (drawcursor)
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{
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for (c = 0; c < 8; c++)
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{
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((uint32_t *)buffer32->line[t3100e->displine])[(x << 3) + c] = cols[(fontdatm[bold][sc] & (1 << (c ^ 7))) ? 1 : 0] ^ (amber ^ black);
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}
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}
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else
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{
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for (c = 0; c < 8; c++)
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((uint32_t *)buffer32->line[t3100e->displine])[(x << 3) + c] = cols[(fontdatm[bold][sc] & (1 << (c ^ 7))) ? 1 : 0];
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}
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++ma;
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}
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}
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/* Draw a row of text in 40-column mode */
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void t3100e_text_row40(t3100e_t *t3100e)
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{
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uint32_t cols[2];
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int x, c;
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uint8_t chr, attr;
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int drawcursor;
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int cursorline;
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int bold;
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int blink;
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uint16_t addr;
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uint8_t sc;
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uint16_t ma = (t3100e->cga_crtc[13] | (t3100e->cga_crtc[12] << 8)) & 0x7fff;
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uint16_t ca = (t3100e->cga_crtc[15] | (t3100e->cga_crtc[14] << 8)) & 0x7fff;
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sc = (t3100e->displine) & 15;
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addr = ((ma & ~1) + (t3100e->displine >> 4) * 40) * 2;
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ma += (t3100e->displine >> 4) * 40;
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if ((t3100e->cga_crtc[10] & 0x60) == 0x20)
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{
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cursorline = 0;
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}
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else
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{
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cursorline = ((t3100e->cga_crtc[10] & 0x0F)*2 <= sc) &&
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((t3100e->cga_crtc[11] & 0x0F)*2 >= sc);
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}
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for (x = 0; x < 40; x++)
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{
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chr = t3100e->vram[(addr + 2 * x) & 0x7FFF];
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attr = t3100e->vram[(addr + 2 * x + 1) & 0x7FFF];
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drawcursor = ((ma == ca) && cursorline &&
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(t3100e->cga_ctrl & 8) && (t3100e->blink & 16));
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blink = ((t3100e->blink & 16) && (t3100e->cga_ctrl & 0x20) &&
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(attr & 0x80) && !drawcursor);
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if (t3100e->video_options & 4)
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bold = (attr & 8) ? chr + 256 : chr;
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else bold = (attr & 8) ? chr : chr + 256;
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if (t3100e->cga_ctrl & 0x20) /* Blink */
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{
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cols[1] = blinkcols[attr][1];
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cols[0] = blinkcols[attr][0];
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if (blink) cols[1] = cols[0];
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}
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else
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{
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cols[1] = normcols[attr][1];
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cols[0] = normcols[attr][0];
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}
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if (drawcursor)
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{
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for (c = 0; c < 8; c++)
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{
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((uint32_t *)buffer32->line[t3100e->displine])[(x << 4) + c*2] =
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((uint32_t *)buffer32->line[t3100e->displine])[(x << 4) + c*2 + 1] = cols[(fontdatm[bold][sc] & (1 << (c ^ 7))) ? 1 : 0] ^ (amber ^ black);
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}
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}
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else
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{
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for (c = 0; c < 8; c++)
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{
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((uint32_t *)buffer32->line[t3100e->displine])[(x << 4) + c*2] =
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((uint32_t *)buffer32->line[t3100e->displine])[(x << 4) + c*2+1] = cols[(fontdatm[bold][sc] & (1 << (c ^ 7))) ? 1 : 0];
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}
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}
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++ma;
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}
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}
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/* Draw a line in CGA 640x200 or T3100e 640x400 mode */
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void t3100e_cgaline6(t3100e_t *t3100e)
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{
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int x, c;
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uint8_t dat;
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uint32_t ink = 0;
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uint16_t addr;
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uint32_t fg = (t3100e->cga_colour & 0x0F) ? amber : black;
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uint32_t bg = black;
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uint16_t ma = (t3100e->cga_crtc[13] | (t3100e->cga_crtc[12] << 8)) & 0x7fff;
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if (t3100e->cga_crtc[9] == 3) /* 640*400 */
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{
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addr = ((t3100e->displine) & 1) * 0x2000 +
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((t3100e->displine >> 1) & 1) * 0x4000 +
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(t3100e->displine >> 2) * 80 +
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((ma & ~1) << 1);
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}
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else
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{
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addr = ((t3100e->displine >> 1) & 1) * 0x2000 +
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(t3100e->displine >> 2) * 80 +
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((ma & ~1) << 1);
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}
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for (x = 0; x < 80; x++)
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{
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dat = t3100e->vram[addr & 0x7FFF];
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addr++;
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for (c = 0; c < 8; c++)
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{
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ink = (dat & 0x80) ? fg : bg;
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if (!(t3100e->cga_ctrl & 8)) ink = black;
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((uint32_t *)buffer32->line[t3100e->displine])[x*8+c] = ink;
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dat = dat << 1;
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}
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}
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}
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/* Draw a line in CGA 320x200 mode. Here the CGA colours are converted to
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* dither patterns: colour 1 to 25% grey, colour 2 to 50% grey */
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void t3100e_cgaline4(t3100e_t *t3100e)
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{
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int x, c;
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uint8_t dat, pattern;
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uint32_t ink0, ink1;
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uint16_t addr;
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uint16_t ma = (t3100e->cga_crtc[13] | (t3100e->cga_crtc[12] << 8)) & 0x7fff;
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if (t3100e->cga_crtc[9] == 3) /* 320*400 undocumented */
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{
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addr = ((t3100e->displine) & 1) * 0x2000 +
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((t3100e->displine >> 1) & 1) * 0x4000 +
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(t3100e->displine >> 2) * 80 +
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((ma & ~1) << 1);
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}
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else /* 320*200 */
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{
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addr = ((t3100e->displine >> 1) & 1) * 0x2000 +
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(t3100e->displine >> 2) * 80 +
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((ma & ~1) << 1);
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}
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for (x = 0; x < 80; x++)
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{
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dat = t3100e->vram[addr & 0x7FFF];
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addr++;
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for (c = 0; c < 4; c++)
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{
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pattern = (dat & 0xC0) >> 6;
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if (!(t3100e->cga_ctrl & 8)) pattern = 0;
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switch (pattern & 3)
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{
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case 0: ink0 = ink1 = black; break;
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case 1: if (t3100e->displine & 1)
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{
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ink0 = black; ink1 = black;
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}
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else
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{
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ink0 = amber; ink1 = black;
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}
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break;
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case 2: if (t3100e->displine & 1)
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{
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ink0 = black; ink1 = amber;
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}
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else
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{
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ink0 = amber; ink1 = black;
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}
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break;
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case 3: ink0 = ink1 = amber; break;
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}
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((uint32_t *)buffer32->line[t3100e->displine])[x*8+2*c] = ink0;
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((uint32_t *)buffer32->line[t3100e->displine])[x*8+2*c+1] = ink1;
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dat = dat << 2;
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}
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}
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}
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void t3100e_poll(void *p)
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{
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t3100e_t *t3100e = (t3100e_t *)p;
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if (t3100e->video_options != st_video_options)
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{
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t3100e->video_options = st_video_options;
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if (t3100e->video_options & 8) /* Disable internal CGA */
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mem_mapping_disable(&t3100e->mapping);
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else mem_mapping_enable(&t3100e->mapping);
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}
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if (!t3100e->linepos)
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{
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t3100e->vidtime += t3100e->dispofftime;
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t3100e->cga_stat |= 1;
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t3100e->linepos = 1;
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if (t3100e->dispon)
|
||||
{
|
||||
if (t3100e->displine == 0)
|
||||
{
|
||||
video_wait_for_buffer();
|
||||
}
|
||||
|
||||
/* Graphics */
|
||||
if (t3100e->cga_ctrl & 0x02)
|
||||
{
|
||||
if (t3100e->cga_ctrl & 0x10)
|
||||
t3100e_cgaline6(t3100e);
|
||||
else t3100e_cgaline4(t3100e);
|
||||
}
|
||||
else
|
||||
if (t3100e->cga_ctrl & 0x01) /* High-res text */
|
||||
{
|
||||
t3100e_text_row80(t3100e);
|
||||
}
|
||||
else
|
||||
{
|
||||
t3100e_text_row40(t3100e);
|
||||
}
|
||||
}
|
||||
t3100e->displine++;
|
||||
/* Hardcode a fixed refresh rate and VSYNC timing */
|
||||
if (t3100e->displine == 400) /* Start of VSYNC */
|
||||
{
|
||||
t3100e->cga_stat |= 8;
|
||||
t3100e->dispon = 0;
|
||||
}
|
||||
if (t3100e->displine == 416) /* End of VSYNC */
|
||||
{
|
||||
t3100e->displine = 0;
|
||||
t3100e->cga_stat &= ~8;
|
||||
t3100e->dispon = 1;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
if (t3100e->dispon)
|
||||
{
|
||||
t3100e->cga_stat &= ~1;
|
||||
}
|
||||
t3100e->vidtime += t3100e->dispontime;
|
||||
t3100e->linepos = 0;
|
||||
|
||||
if (t3100e->displine == 400)
|
||||
{
|
||||
/* Hardcode 640x400 window size */
|
||||
if (T3100E_XSIZE != xsize || T3100E_YSIZE != ysize)
|
||||
{
|
||||
xsize = T3100E_XSIZE;
|
||||
ysize = T3100E_YSIZE;
|
||||
if (xsize < 64) xsize = 656;
|
||||
if (ysize < 32) ysize = 200;
|
||||
updatewindowsize(xsize, ysize);
|
||||
}
|
||||
video_blit_memtoscreen(0, 0, 0, ysize, xsize, ysize);
|
||||
|
||||
frames++;
|
||||
/* Fixed 640x400 resolution */
|
||||
video_res_x = T3100E_XSIZE;
|
||||
video_res_y = T3100E_YSIZE;
|
||||
|
||||
if (t3100e->cga_ctrl & 0x02)
|
||||
{
|
||||
if (t3100e->cga_ctrl & 0x10)
|
||||
video_bpp = 1;
|
||||
else video_bpp = 2;
|
||||
|
||||
}
|
||||
else video_bpp = 0;
|
||||
t3100e->blink++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void *t3100e_init()
|
||||
{
|
||||
int n;
|
||||
t3100e_t *t3100e = malloc(sizeof(t3100e_t));
|
||||
memset(t3100e, 0, sizeof(t3100e_t));
|
||||
|
||||
/* 32k video RAM */
|
||||
t3100e->vram = malloc(0x8000);
|
||||
|
||||
timer_add(t3100e_poll, &t3100e->vidtime, TIMER_ALWAYS_ENABLED, t3100e);
|
||||
|
||||
/* Occupy memory between 0xB8000 and 0xBFFFF */
|
||||
mem_mapping_add(&t3100e->mapping, 0xb8000, 0x8000, t3100e_read, NULL, NULL, t3100e_write, NULL, NULL, NULL, 0, t3100e);
|
||||
/* Respond to CGA I/O ports */
|
||||
io_sethandler(0x03d0, 0x000c, t3100e_in, NULL, NULL, t3100e_out, NULL, NULL, t3100e);
|
||||
|
||||
/* Set up colours */
|
||||
amber = makecol(0xf7, 0x7C, 0x34);
|
||||
black = makecol(0x17, 0x0C, 0x00);
|
||||
|
||||
/* Initialise the attribute mapping. Start by defaulting everything
|
||||
* to black on amber */
|
||||
for (n = 0; n < 256; n++)
|
||||
{
|
||||
blinkcols[n][0] = normcols[n][0] = amber;
|
||||
blinkcols[n][1] = normcols[n][1] = black;
|
||||
}
|
||||
/* Except 00-0F and 80-8F which are amber on black */
|
||||
for (n = 0; n < 16; n++)
|
||||
{
|
||||
blinkcols[n][0] = normcols[n][0] = black;
|
||||
blinkcols[n][1] = normcols[n][1] = amber;
|
||||
blinkcols[n+128][0] = normcols[n+128][0] = black;
|
||||
blinkcols[n+128][1] = normcols[n+128][1] = amber;
|
||||
}
|
||||
/* In the normal range, 00 11 22 .. FF are black */
|
||||
for (n = 0; n <= 0xFF; n += 0x11)
|
||||
{
|
||||
normcols[n][0] = normcols[n][1] = black;
|
||||
}
|
||||
/* In the blinking range, 00 11 22 .. 77 and 80 91 A2 .. F7 are black */
|
||||
for (n = 0; n <= 0x77; n += 0x11)
|
||||
{
|
||||
blinkcols[n][0] = blinkcols[n][1] = black;
|
||||
blinkcols[n+128][0] = blinkcols[n+128][1] = black;
|
||||
}
|
||||
|
||||
/* Start off in 80x25 text mode */
|
||||
t3100e->cga_stat = 0xF4;
|
||||
t3100e->enabled = 1;
|
||||
t3100e->video_options = 0xFF;
|
||||
return t3100e;
|
||||
}
|
||||
|
||||
void t3100e_close(void *p)
|
||||
{
|
||||
t3100e_t *t3100e = (t3100e_t *)p;
|
||||
|
||||
free(t3100e->vram);
|
||||
free(t3100e);
|
||||
}
|
||||
|
||||
void t3100e_speed_changed(void *p)
|
||||
{
|
||||
t3100e_t *t3100e = (t3100e_t *)p;
|
||||
|
||||
t3100e_recalctimings(t3100e);
|
||||
}
|
||||
|
||||
device_t t3100e_device =
|
||||
{
|
||||
"Toshiba T3100e",
|
||||
0,
|
||||
t3100e_init,
|
||||
t3100e_close,
|
||||
NULL,
|
||||
t3100e_speed_changed,
|
||||
NULL,
|
||||
NULL
|
||||
};
|
||||
Loading…
Reference in a new issue