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21bafa37a5aae28aeb63f0e2f2ad4c5a0720d2b1
86Box/src/video/vid_jega.c
Akamaki 21bafa37a5 correct a compile error
2025-03-20 00:44:03 +09:00

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/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
*
* Emulation of the JEGA (Japanese EGA), a part of the AX architecture.
*
* It's an extension of the SuperEGA. Superimposing text (AX-2) is not available.
*
* Authors: Akamaki
*
* Copyright 2025 Akamaki
*/
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <wchar.h>
#define HAVE_STDARG_H
#include <86box/86box.h>
#include "cpu.h"
#include <86box/io.h>
#include <86box/timer.h>
#include <86box/pic.h>
#include <86box/pit.h>
#include <86box/mem.h>
#include <86box/rom.h>
#include <86box/device.h>
#include <86box/video.h>
#include <86box/vid_ega.h>
/* JEGA internal registers */
#define RPESL 0x09 /* End Scan Line */
#define RCCSL 0x0A /* Cursor Start Line */
#define RCCEL 0x0B /* Cursor End Line */
#define RCCLH 0x0E /* Cursor Location High */
#define RCCLL 0x0F /* Cursor Location Low */
#define RPULP 0x14 /* Under Line Position */
/* + 0xB8 - 0x20 */
#define RMOD1 0x21 /* Display out, EGA through, Superimpose, Sync with EGA, Master EGA, Slave EGA, n/a, Test */
#define RMOD2 0x22 /* 1st Attr, 2nd Attr, Blink/Int, n/a, Font access mode (b3-2), Font map sel (b1-0)*/
#define RDAGS 0x23 /* ANK Group Select */
#define RDFFB 0x24 /* Font Access First Byte */
#define RDFSB 0x25 /* Font Access Second Byte */
#define RDFAP 0x26 /* Font Access Pattern */
#define RSTAT 0x27 /* Font Status Register */
/* + 0xD0 - 0x20 */
#define RPSSU 0x29 /* Start Scan Upper */
#define RPSSL 0x2A /* Start Scan Lower */
#define RPSSC 0x2B /* Start Scan Count */
#define RPPAJ 0x2C /* Phase Adjust Count */
#define RCMOD 0x2D /* Cursor Mode */
#define RCSKW 0x2E /* Cursor Skew Control */
#define ROMSL 0x2F /* ? */
#define RINVALID_INDEX 0x30
#define JEGA_PATH_BIOS "roms/video/jega/JEGABIOS.BIN"
#define JEGA_PATH_FONTDBCS "roms/video/jega/JPNZN16X.FNT"
#define SBCS19_FILESIZE (256 * 19 * 2) /* 8 x 19 x 256 chr x 2 pages */
#define DBCS16_CHARS 0x2c10
#define DBCS16_FILESIZE (DBCS16_CHARS * 16 * 2)
#define INVALIDACCESS8 0xffu
#define INVALIDACCESS16 0xffffu
#define INVALIDACCESS32 0xffffffffu
#ifndef RELEASE_BUILD
// # define ENABLE_JEGA_LOG 1
#endif
#ifdef ENABLE_JEGA_LOG
int jega_do_log = ENABLE_JEGA_LOG;
static void
jega_log(const char *fmt, ...)
{
va_list ap;
if (jega_do_log) {
va_start(ap, fmt);
pclog_ex(fmt, ap);
va_end(ap);
}
}
#else
# define jega_log(fmt, ...)
#endif
static video_timings_t timing_ega = { .type = VIDEO_ISA, .write_b = 8, .write_w = 16, .write_l = 32, .read_b = 8, .read_w = 16, .read_l = 32 };
typedef struct jega_t {
rom_t bios_rom;
ega_t ega;
uint8_t regs_index; /* 3D4/3D5 index B9-BF, D9-DF */
uint8_t regs[0x31];
uint8_t egapal[16];
uint8_t attrregs[32];
uint8_t attraddr;
uint8_t attrff;
uint8_t attr_palette_enable;
uint32_t *pallook;
int con;
int cursoron;
int cursorblink_disable;
int ca;
int font_index;
int sbcsbank_inv;
int attr3_sbcsbank;
int start_scan_lower;
int start_scan_upper;
int start_scan_count;
uint8_t *vram;
uint8_t jfont_sbcs_19[SBCS19_FILESIZE]; /* 8 x 19 font */
uint8_t jfont_dbcs_16[DBCS16_FILESIZE]; /* 16 x 16 font. Use dbcs_read/write to access it. */
} jega_t;
static void jega_recalctimings(void *priv);
#define FONTX_LEN_ID 6
#define FONTX_LEN_FN 8
typedef struct {
char id[FONTX_LEN_ID];
char name[FONTX_LEN_FN];
unsigned char width;
unsigned char height;
unsigned char type;
} fontx_h;
typedef struct {
uint16_t start;
uint16_t end;
} fontx_tbl;
static uint32_t pallook64[256];
static bool is_SJIS_1(uint8_t chr) { return (chr >= 0x81 && chr <= 0x9f) || (chr >= 0xe0 && chr <= 0xfc); }
static bool is_SJIS_2(uint8_t chr) { return (chr >= 0x40 && chr <= 0x7e) || (chr >= 0x80 && chr <= 0xfc); }
static uint16_t
SJIS_to_SEQ(uint16_t sjis)
{
uint32_t chr1 = (sjis >> 8) & 0xff;
uint32_t chr2 = sjis & 0xff;
if (!is_SJIS_1(chr1) || !is_SJIS_2(chr2)) return INVALIDACCESS16;
chr1 -= 0x81;
if (chr1 > 0x5E) chr1 -= 0x40;
chr2 -= 0x40;
if (chr2 > 0x3F) chr2--;
chr1 *= 0xBC;
return (chr1 + chr2);
}
static uint8_t
dbcs_read(uint16_t sjis, int index, void *priv) {
jega_t *jega = (jega_t *) priv;
int seq = SJIS_to_SEQ(sjis);
if (seq >= DBCS16_CHARS || index >= 32)
return INVALIDACCESS8;
return jega->jfont_dbcs_16[seq * 32 + index];
}
static void
dbcs_write(uint16_t sjis, int index, uint8_t val, void *priv) {
jega_t *jega = (jega_t *) priv;
int seq = SJIS_to_SEQ(sjis);
if (seq >= DBCS16_CHARS || index >= 32)
return;
jega->jfont_dbcs_16[seq * 32 + index] = val;
}
/* Display Adapter Mode 3 Drawing */
void
jega_render_text(void *priv)
{
jega_t *jega = (jega_t *) priv;
if (jega->ega.firstline_draw == 2000)
jega->ega.firstline_draw = jega->ega.displine;
jega->ega.lastline_draw = jega->ega.displine;
if (jega->ega.fullchange) {
// const bool doublewidth = ((jega->ega.seqregs[1] & 8) != 0);
const bool attrblink = ((jega->regs[RMOD2] & 0x20) == 0); /* JEGA specific */
// const bool attrlinechars = (jega->ega.attrregs[0x10] & 4);
const bool crtcreset = ((jega->ega.crtc[0x17] & 0x80) == 0) || (jega->regs[RMOD1] & 0x80 == 0);
const int charwidth = 8;
const bool blinked = jega->ega.blink & 0x10;
uint32_t *p = &buffer32->line[jega->ega.displine + jega->ega.y_add][jega->ega.x_add];
bool chr_wide = false;
int sc_wide = jega->ega.sc - jega->start_scan_count;
const bool cursoron = (blinked || jega->cursorblink_disable)
&& (jega->ega.sc >= jega->regs[RCCSL]) && (jega->ega.sc <= jega->regs[RCCEL]);
uint32_t chr_first;
uint32_t attr_basic;
int fg;
int bg;
for (int x = 0; x < (jega->ega.hdisp + jega->ega.scrollcache); x += charwidth) {
uint32_t addr = jega->ega.remap_func(&jega->ega, jega->ega.ma) & jega->ega.vrammask;
int drawcursor = ((jega->ega.ma == jega->ca) && cursoron);
uint32_t chr;
uint32_t attr;
if (!crtcreset) {
chr = jega->ega.vram[addr];
attr = jega->ega.vram[addr + 1];
} else
chr = attr = 0;
if (chr_wide) {
uint8_t attr_ext = 0;
/* the code may be in DBCS */
if (jega->regs[RMOD2] & 0x40) {
/* Parse JEGA extended attribute */
/* Bold | 2x width | 2x height | U/L select | R/L select | - | - | - */
attr_ext = attr;
if ((attr_ext & 0x30) == 0x30)
sc_wide = jega->ega.sc - jega->start_scan_lower; /* Set top padding of lower 2x character */
else if ((attr_ext & 0x30) == 0x20)
sc_wide = jega->ega.sc - jega->start_scan_upper; /* Set top padding of upper 2x character */
else
sc_wide = jega->ega.sc - jega->start_scan_count;
}
if (is_SJIS_2(chr) && sc_wide >= 0 && sc_wide < 16 && jega->ega.sc <= jega->regs[RPESL]) {
chr_first <<= 8;
chr |= chr_first;
/* Vertical wide font (Extended Attribute) */
if (attr_ext & 0x20) {
if (attr_ext & 0x10)
sc_wide = (sc_wide >> 1) + 8;
else
sc_wide = sc_wide >> 1;
}
/* Horizontal wide font (Extended Attribute) */
if (attr_ext & 0x40) {
uint32_t dat = dbcs_read(chr, sc_wide, jega);
if (!(attr_ext & 0x08)) { /* right half of character */
dat = dbcs_read(chr, sc_wide + 16, jega);
}
for (int xx = 0; xx < charwidth; xx++) {
p[xx * 2] = (dat & (0x80 >> xx)) ? fg : bg;
p[xx * 2 + 1] = (dat & (0x80 >> xx)) ? fg : bg;
}
} else {
uint32_t dat = dbcs_read(chr, sc_wide, jega);
dat <<= 8;
dat |= dbcs_read(chr, sc_wide + 16, jega);
/* Bold (Extended Attribute) */
if (attr_ext &= 0x80) {
uint32_t dat2 = dat;
dat2 >>= 1;
dat |= dat2;
}
for (int xx = 0; xx < charwidth * 2; xx++)
p[xx] = (dat & (0x8000 >> xx)) ? fg : bg;
}
} else {
/* invalid DBCS code or line space then put blank */
for (int xx = 0; xx < charwidth * 2; xx++)
p[xx] = bg;
}
if (attr_basic & 0x20) { /* vertical line */
p[0] = fg;
}
if ((jega->ega.sc == jega->regs[RPULP]) && (attr_basic & 0x10)) { /* underline */
for (int xx = 0; xx < charwidth * 2; xx++)
p[xx] = fg;
}
chr_wide = false;
p += (charwidth * 2);
} else {
/* SBCS or invalid second byte of DBCS */
if (jega->regs[RMOD2] & 0x80) {
/* Parse attribute as JEGA */
/* Blink | Reverse | V line | U line | (Bit 3-0 is the same as EGA) */
/* The background color is always black (transparent in AX-2) */
if (drawcursor || attr & 0x40) {
bg = jega->pallook[jega->egapal[attr & 0x0f]];
fg = 0;
} else {
fg = jega->pallook[jega->egapal[attr & 0x0f]];
bg = 0;
if (attr & 0x80) {
bg = 0;
if (blinked)
fg = bg;
}
}
attr_basic = attr;
} else {
/* Parse attribute as EGA */
/* BInt/Blink | BR | BG | BB | Int/Group | R | G | B */
if (drawcursor) {
bg = jega->pallook[jega->egapal[attr & 0x0f]];
fg = jega->pallook[jega->egapal[attr >> 4]];
} else {
fg = jega->pallook[jega->egapal[attr & 0x0f]];
bg = jega->pallook[jega->egapal[attr >> 4]];
if ((attr & 0x80) && attrblink) {
bg = jega->pallook[jega->egapal[(attr >> 4) & 7]];
if (blinked)
fg = bg;
}
}
attr_basic = 0;
}
if (is_SJIS_1(chr)) {
/* the char code maybe in DBCS */
chr_first = chr;
chr_wide = true;
} else {
/* the char code is in SBCS */
uint32_t charaddr = chr;
// if (jega->attr3_sbcsbank && (attr & 8))
// charaddr |= 0x100;
// if (jega->sbcsbank_inv)
// charaddr ^= 0x100;
charaddr *= 19;
uint32_t dat = jega->jfont_sbcs_19[charaddr + jega->ega.sc];
for (int xx = 0; xx < charwidth; xx++)
p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
if (attr_basic & 0x20) { /* vertical line */
p[0] = fg;
}
if ((jega->ega.sc == jega->regs[RPULP]) && (attr_basic & 0x10)) { /* underline */
for (int xx = 0; xx < charwidth; xx++)
p[xx] = fg;
}
p += charwidth;
}
}
jega->ega.ma += 4;
}
jega->ega.ma &= 0x3ffff;
}
}
static void
jega_out(uint16_t addr, uint8_t val, void *priv)
{
uint8_t o;
jega_t *jega = (jega_t *) priv;
uint16_t chr;
// jega_log("JEGA Out %04X %02X(%d) %04X:%04X\n", addr, val, val, cs >> 4, cpu_state.pc);
switch (addr) {
case 0x3c0:
case 0x3c1:
jega_log("Palette %02X %02X(%d) %04X:%04X\n", jega->attraddr, val, val, cs >> 4, cpu_state.pc);
/* Palette (write only) */
if (!jega->attrff) {
jega->attraddr = val & 31;
if ((val & 0x20) != jega->attr_palette_enable) {
jega->ega.fullchange = 3;
jega->attr_palette_enable = val & 0x20;
jega_recalctimings(jega);
}
} else {
o = jega->attrregs[jega->attraddr & 31];
jega->attrregs[jega->attraddr & 31] = val;
if (jega->attraddr < 0x10) {
for (uint8_t c = 0; c < 16; c++) {
jega->egapal[c] = jega->attrregs[c] & 0x3f;
}
jega->ega.fullchange = changeframecount;
}
}
jega->attrff ^= 1;
break;
case 0x3b4:
case 0x3d4:
/* Index 0x00-0x1F (write only), 0xB8-0xDF (write and read) */
if (val >= 0xB8 && val <= 0xBF)
jega->regs_index = val - 0xB8 + 0x20;
else if (val >= 0xD8 && val <= 0xDF)
jega->regs_index = val - 0xD0 + 0x20;
else if (val <= 0x1F)
jega->regs_index = val;
else
jega->regs_index = RINVALID_INDEX;
break;
case 0x3b5:
case 0x3d5:
/* Data */
if (jega->regs_index != RINVALID_INDEX) {
jega->regs[jega->regs_index] = val;
jega_log("JEGA Out %04X(%02X) %02Xh(%d) %04X:%04X\n", addr, jega->regs_index, val, val, cs >> 4, cpu_state.pc);
switch (jega->regs_index) {
case RMOD1:
/* if the value is changed */
// if (jega->regs[jega->regs_index] != val) {
if (val & 0x40)
jega->ega.render_override = NULL;
else
jega->ega.render_override = jega_render_text;
// }
break;
case RDAGS:
switch (val & 0x03) {
case 0x00:
jega->attr3_sbcsbank = false;
jega->sbcsbank_inv = false;
break;
case 0x01:
jega->attr3_sbcsbank = true;
jega->sbcsbank_inv = false;
break;
case 0x02:
jega->attr3_sbcsbank = true;
jega->sbcsbank_inv = true;
break;
case 0x03:
jega->attr3_sbcsbank = false;
jega->sbcsbank_inv = true;
break;
}
break;
case RCCLH:
case RCCLL:
jega->ca = jega->regs[RCCLH] << 10 | jega->regs[RCCLL] << 2;
break;
case RCMOD:
jega->cursoron = (val & 0x80);
jega->cursorblink_disable = (~val & 0x20);
break;
case RDFFB:
case RDFSB:
/* reset the line number */
jega->font_index = 0;
break;
case RPSSC:
if (val <= 17)
jega->start_scan_count = val + 1;
else
jega->start_scan_count = (val - 32) + 1;
break;
case RPSSL:
jega->start_scan_lower = val - 15;
break;
case RPSSU:
if (val <= 33)
jega->start_scan_upper = val + 4;
else
jega->start_scan_upper = (val - 64) + 4;
break;
case RDFAP:
chr = jega->regs[RDFFB];
if (is_SJIS_1(chr) && chr >= 0xf0 && chr <= 0xf3) {
chr <<= 8;
chr |= jega->regs[RDFSB];
if (jega->font_index < 32)
dbcs_write(chr, jega->font_index, val, jega);
} else {
if (jega->font_index <19)
jega->jfont_sbcs_19[chr * 19 + jega->font_index] = val;
}
jega_log("JEGA Font W %X %d %02Xh(%d) %04X:%04X\n", chr, jega->font_index, val, val, cs >> 4, cpu_state.pc);
jega->font_index++;
break;
}
}
break;
default:
break;
}
if (jega->regs[RMOD1] & 0x0C) /* Accessing to Slave EGA is redirected to Master in AX-1. */
ega_out(addr, val, &jega->ega);
}
static uint8_t
jega_in(uint16_t addr, void *priv)
{
jega_t *jega = (jega_t *) priv;
uint8_t ret = INVALIDACCESS8;
uint16_t chr;
switch (addr) {
case 0x3b5:
case 0x3d5:
if (jega->regs_index >= 0x20 && jega->regs_index <= 0x2F) {
switch (jega->regs_index) {
case RDFAP:
chr = jega->regs[RDFFB];
/* DBCS or SBCS */
if (is_SJIS_1(chr)) {
chr <<= 8;
chr |= jega->regs[RDFSB];
if (jega->font_index < 32)
ret = dbcs_read(chr, jega->font_index, jega);
} else {
if (jega->font_index < 19)
ret = jega->jfont_sbcs_19[chr * 19 + jega->font_index];
}
jega_log("JEGA Font R %X %d %02Xh(%d) %04X:%04X\n", chr, jega->font_index, ret, ret, cs >> 4, cpu_state.pc);
jega->font_index++;
break;
case RSTAT:
ret = 0x03;
break;
default:
ret = jega->regs[jega->regs_index];
break;
}
jega_log("JEGA In %04X(%02X) %02X %04X:%04X\n", addr, jega->regs_index, ret, cs >> 4, cpu_state.pc);
} else if (jega->regs[RMOD1] & 0x0C) /* Accessing to Slave EGA is redirected to Master in AX-1. */
ret = ega_in(addr, &jega->ega);
break;
case 0x3ba:
case 0x3da:
jega->attrff = 0;
default:
if (jega->regs[RMOD1] & 0x0C) /* Accessing to Slave is redirected to Master in AX-1. */
ret = ega_in(addr, &jega->ega);
break;
}
// jega_log("JEGA In %04X(%02X) %02X %04X:%04X\n", addr, jega->regs_index, ret, cs >> 4, cpu_state.pc);
return ret;
}
static int
getfontx2header(FILE *fp, fontx_h *header)
{
fread(header->id, FONTX_LEN_ID, 1, fp);
if (strncmp(header->id, "FONTX2", FONTX_LEN_ID) != 0) {
return 1;
}
fread(header->name, FONTX_LEN_FN, 1, fp);
header->width = (uint8_t) getc(fp);
header->height = (uint8_t) getc(fp);
header->type = (uint8_t) getc(fp);
return 0;
}
static uint16_t
chrtosht(FILE *fp)
{
uint16_t i, j;
i = (uint16_t) getc(fp);
j = (uint16_t) getc(fp) << 8;
return (i | j);
}
static void
readfontxtbl(fontx_tbl *table, int size, FILE *fp)
{
while (size > 0) {
table->start = chrtosht(fp);
table->end = chrtosht(fp);
++table;
--size;
}
}
static int
LoadFontxFile(const char *fn, void *priv)
{
fontx_h fhead;
fontx_tbl *ftbl;
uint16_t code;
uint16_t scode;
uint8_t size;
uint8_t buf;
int line;
jega_t *jega = (jega_t *) priv;
FILE *fp = rom_fopen(fn, "rb");
jega_log("JEGA: Loading font\n");
if (fp == NULL) {
jega_log("JEGA: font file '%s' not found.\n", fn);
return 0;
}
if (getfontx2header(fp, &fhead) != 0) {
fclose(fp);
jega_log("JEGA: FONTX2 header is incorrect.\n");
return 1;
}
/* DBCS or SBCS */
if (fhead.type == 1) {
if (fhead.width == 16 && fhead.height == 16) {
size = getc(fp);
ftbl = (fontx_tbl *) calloc(size, sizeof(fontx_tbl));
readfontxtbl(ftbl, size, fp);
for (int i = 0; i < size; i++) {
for (code = ftbl[i].start; code <= ftbl[i].end; code++) {
scode = SJIS_to_SEQ(code);
if (scode != INVALIDACCESS16) {
for (line = 0; line < 16; line++) {
fread(&buf, sizeof(uint8_t), 1, fp);
jega->jfont_dbcs_16[(int) (scode * 32) + line] = buf;
fread(&buf, sizeof(uint8_t), 1, fp);
jega->jfont_dbcs_16[(int) (scode * 32) + line + 16] = buf;
}
} else {
fseek(fp, 32, SEEK_CUR);
}
}
}
} else {
fclose(fp);
jega_log("JEGA: Width or height of DBCS font doesn't match.\n");
return 1;
}
} else {
if (fhead.width == 8 && fhead.height == 19) {
fread(jega->jfont_sbcs_19, sizeof(uint8_t), SBCS19_FILESIZE, fp);
} else {
fclose(fp);
jega_log("JEGA: Width or height of SBCS font doesn't match.\n");
return 1;
}
}
fclose(fp);
return 0;
}
static void *
jega_init(const device_t *info)
{
jega_t *jega = calloc(1, sizeof(jega_t));
rom_init(&jega->bios_rom, JEGA_PATH_BIOS, 0xc0000, 0x8000, 0x7fff, 0, 0);
memset(&jega->jfont_dbcs_16, 0, DBCS16_FILESIZE);
LoadFontxFile(JEGA_PATH_FONTDBCS, jega);
for (int c = 0; c < 256; c++) {
pallook64[c] = makecol32(((c >> 2) & 1) * 0xaa, ((c >> 1) & 1) * 0xaa, (c & 1) * 0xaa);
pallook64[c] += makecol32(((c >> 5) & 1) * 0x55, ((c >> 4) & 1) * 0x55, ((c >> 3) & 1) * 0x55);
}
video_inform(VIDEO_FLAG_TYPE_SPECIAL, &timing_ega);
jega->pallook = pallook64;
ega_init(&jega->ega, 9, 0);
jega->ega.actual_type = EGA_SUPEREGA;
jega->ega.priv_parent = jega;
mem_mapping_add(&jega->ega.mapping, 0xa0000, 0x20000, ega_read, NULL, NULL, ega_write, NULL, NULL, NULL, MEM_MAPPING_EXTERNAL, &jega->ega);
io_sethandler(0x03b0, 0x0030, jega_in, NULL, NULL, jega_out, NULL, NULL, jega);
jega->regs[RMOD1] = 0x48;
}
static void
jega_close(void *priv)
{
jega_t *jega = (jega_t *) priv;
#ifdef ENABLE_JEGA_LOG
FILE *f;
// f = fopen("jega_font16.dmp", "wb");
// if (f != NULL) {
// fwrite(jega->jfont_dbcs_16, DBCS16_FILESIZE, 1, f);
// fclose(f);
// }
// f = fopen("jega_font19.dmp", "wb");
// if (f != NULL) {
// fwrite(jega->jfont_sbcs_19, SBCS19_FILESIZE, 1, f);
// fclose(f);
// }
f = fopen("jega_regs.txt", "wb");
if (f != NULL) {
for (int i = 0; i < 49; i++)
fprintf(f, "Regs %02X: %4X\n", i, jega->regs[i]);
for (int i = 0; i < 32; i++)
fprintf(f, "Attr %02X: %4X\n", i, jega->attrregs[i]);
for (int i = 0; i < 16; i++)
fprintf(f, "JEGAPal %02X: %4X\n", i, jega->egapal[i]);
for (int i = 0; i < 16; i++)
fprintf(f, "EGAPal %02X: %4X\n", i, jega->ega.egapal[i]);
for (int i = 0; i < 64; i++)
fprintf(f, "RealPal %02X: %4X\n", i, jega->pallook[i]);
fclose(f);
}
// f = fopen("ega_vram.dmp", "wb");
// if (f != NULL) {
// fwrite(jega->ega.vram, 256 * 1024, 1, f);
// fclose(f);
// }
f = fopen("ram_bda.dmp", "wb");
if (f != NULL) {
fwrite(&ram[0x0], 0x500, 1, f);
fclose(f);
}
// jega_log("jeclosed %04X:%04X DS %04X\n", cs >> 4, cpu_state.pc, DS);
#endif
if (jega->ega.eeprom)
free(jega->ega.eeprom);
free(jega->ega.vram);
free(jega);
}
static void
jega_recalctimings(void *priv)
{
jega_t *jega = (jega_t *) priv;
ega_recalctimings(&jega->ega);
}
static void
jega_speed_changed(void *priv)
{
jega_t *jega = (jega_t *) priv;
jega_recalctimings(jega);
}
static int
jega_available(void)
{
return (rom_present(JEGA_PATH_BIOS) && rom_present(JEGA_PATH_FONTDBCS));
}
const device_t jega_device = {
.name = "JEGA",
.internal_name = "jega",
.flags = DEVICE_ISA,
.local = 0,
.init = jega_init,
.close = jega_close,
.reset = NULL,
.available = jega_available,
.speed_changed = jega_speed_changed,
.force_redraw = NULL,
.config = NULL
};
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