d2c6452ff5
Fixed 16 color in the Realtek 3106 card. Reworked the Sierra 1148x for the second time. Registers that only exist on 928/80x and up are not used by the 911/924 anymore.
381 lines
7.5 KiB
C
381 lines
7.5 KiB
C
/*
|
|
* 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 Realtek RTG series of VGA ISA chips.
|
|
*
|
|
*
|
|
*
|
|
* Authors: TheCollector1995, <mariogplayer90@gmail.com>
|
|
*
|
|
* Copyright 2021 TheCollector1995.
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <wchar.h>
|
|
#include <86box/86box.h>
|
|
#include <86box/io.h>
|
|
#include <86box/mem.h>
|
|
#include <86box/rom.h>
|
|
#include <86box/device.h>
|
|
#include <86box/timer.h>
|
|
#include <86box/video.h>
|
|
#include <86box/vid_svga.h>
|
|
#include <86box/vid_svga_render.h>
|
|
|
|
|
|
#define BIOS_ROM_PATH "roms/video/rtg/realtekrtg3106.BIN"
|
|
|
|
typedef struct {
|
|
const char *name;
|
|
int type;
|
|
|
|
svga_t svga;
|
|
|
|
rom_t bios_rom;
|
|
|
|
uint8_t bank3d6,
|
|
bank3d7;
|
|
|
|
uint32_t vram_size,
|
|
vram_mask;
|
|
} rtg_t;
|
|
|
|
|
|
static video_timings_t timing_rtg_isa = {VIDEO_ISA, 3, 3, 6, 5, 5, 10};
|
|
|
|
static void rtg_recalcbanking(rtg_t *dev)
|
|
{
|
|
svga_t *svga = &dev->svga;
|
|
|
|
svga->write_bank = (dev->bank3d7 & 0x0f) * 65536;
|
|
|
|
if (svga->gdcreg[0x0f] & 4)
|
|
svga->read_bank = (dev->bank3d6 & 0x0f) * 65536;
|
|
else
|
|
svga->read_bank = svga->write_bank;
|
|
}
|
|
|
|
|
|
static uint8_t
|
|
rtg_in(uint16_t addr, void *priv)
|
|
{
|
|
rtg_t *dev = (rtg_t *)priv;
|
|
svga_t *svga = &dev->svga;
|
|
uint8_t ret = 0;
|
|
|
|
if (((addr & 0xfff0) == 0x3d0 ||
|
|
(addr & 0xfff0) == 0x3b0) && !(svga->miscout & 1)) addr ^= 0x60;
|
|
|
|
switch (addr) {
|
|
case 0x3ce:
|
|
return svga->gdcaddr;
|
|
|
|
case 0x3cf:
|
|
if (svga->gdcaddr == 0x0c)
|
|
return svga->gdcreg[0x0c] | 4;
|
|
else if ((svga->gdcaddr > 8) && (svga->gdcaddr != 0x0c))
|
|
return svga->gdcreg[svga->gdcaddr];
|
|
break;
|
|
|
|
case 0x3d4:
|
|
return svga->crtcreg;
|
|
|
|
case 0x3d5:
|
|
if (!(svga->crtc[0x1e] & 0x80) && (svga->crtcreg > 0x18))
|
|
return 0xff;
|
|
if (svga->crtcreg == 0x1a)
|
|
return dev->type << 6;
|
|
if (svga->crtcreg == 0x1e) {
|
|
if (dev->vram_size == 1024)
|
|
ret = 2;
|
|
else if (dev->vram_size == 512)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
return svga->crtc[0x1e] | ret;
|
|
}
|
|
return svga->crtc[svga->crtcreg];
|
|
|
|
case 0x3d6:
|
|
return dev->bank3d6;
|
|
|
|
case 0x3d7:
|
|
return dev->bank3d7;
|
|
}
|
|
|
|
return svga_in(addr, svga);
|
|
}
|
|
|
|
static void
|
|
rtg_out(uint16_t addr, uint8_t val, void *priv)
|
|
{
|
|
rtg_t *dev = (rtg_t *)priv;
|
|
svga_t *svga = &dev->svga;
|
|
uint8_t old;
|
|
|
|
if (((addr & 0xfff0) == 0x3d0 ||
|
|
(addr & 0xfff0) == 0x3b0) && !(svga->miscout & 1)) addr ^= 0x60;
|
|
|
|
switch (addr) {
|
|
case 0x3ce:
|
|
svga->gdcaddr = val;
|
|
return;
|
|
|
|
case 0x3cf:
|
|
if (svga->gdcaddr > 8) {
|
|
svga->gdcreg[svga->gdcaddr] = val;
|
|
|
|
switch (svga->gdcaddr) {
|
|
case 0x0b:
|
|
case 0x0c:
|
|
svga->fullchange = changeframecount;
|
|
svga_recalctimings(svga);
|
|
break;
|
|
|
|
case 0x0f:
|
|
rtg_recalcbanking(dev);
|
|
return;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 0x3d4:
|
|
svga->crtcreg = val & 0x3f;
|
|
return;
|
|
|
|
case 0x3d5:
|
|
if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
|
|
return;
|
|
if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
|
|
val = (svga->crtc[7] & ~0x10) | (val & 0x10);
|
|
old = svga->crtc[svga->crtcreg];
|
|
svga->crtc[svga->crtcreg] = val;
|
|
|
|
if (svga->crtc[0x1e] & 0x80) {
|
|
switch (svga->crtcreg) {
|
|
case 0x19:
|
|
svga->vram_display_mask = (val & 0x20) ? dev->vram_mask : 0x3ffff;
|
|
svga->fullchange = changeframecount;
|
|
svga_recalctimings(svga);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (old != val) {
|
|
if (svga->crtcreg < 0x0e || svga->crtcreg > 0x10) {
|
|
svga->fullchange = changeframecount;
|
|
svga_recalctimings(svga);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 0x3d6:
|
|
dev->bank3d6 = val;
|
|
rtg_recalcbanking(dev);
|
|
return;
|
|
|
|
case 0x3d7:
|
|
dev->bank3d7 = val;
|
|
rtg_recalcbanking(dev);
|
|
return;
|
|
}
|
|
|
|
svga_out(addr, val, svga);
|
|
}
|
|
|
|
static void
|
|
rtg_recalctimings(svga_t *svga)
|
|
{
|
|
svga->ma_latch = ((svga->crtc[0x19] & 0x10) << 16) | ((svga->crtc[0x19] & 0x40) << 17);
|
|
|
|
svga->interlace = (svga->crtc[0x19] & 1);
|
|
|
|
/*Clock table not available, currently a guesswork*/
|
|
switch (((svga->miscout >> 2) & 3) | ((svga->gdcreg[0x0c] & 0x20) >> 3)) {
|
|
case 0:
|
|
case 1:
|
|
break;
|
|
case 2:
|
|
svga->clock = (cpuclock * (double)(1ull << 32)) / 36000000.0;
|
|
break;
|
|
case 3:
|
|
svga->clock = (cpuclock * (double)(1ull << 32)) / 65100000.0;
|
|
break;
|
|
case 4:
|
|
svga->clock = (cpuclock * (double)(1ull << 32)) / 44900000.0;
|
|
break;
|
|
case 5:
|
|
svga->clock = (cpuclock * (double)(1ull << 32)) / 50000000.0;
|
|
break;
|
|
case 6:
|
|
svga->clock = (cpuclock * (double)(1ull << 32)) / 80000000.0;
|
|
break;
|
|
case 7:
|
|
svga->clock = (cpuclock * (double)(1ull << 32)) / 75000000.0;
|
|
break;
|
|
}
|
|
|
|
switch (svga->gdcreg[0x0c] & 3) {
|
|
case 1:
|
|
svga->clock /= 1.5;
|
|
break;
|
|
case 2:
|
|
svga->clock /= 2;
|
|
break;
|
|
case 3:
|
|
svga->clock /= 4;
|
|
break;
|
|
}
|
|
|
|
if ((svga->gdcreg[6] & 1) || (svga->attrregs[0x10] & 1)) {
|
|
switch (svga->gdcreg[5] & 0x60) {
|
|
case 0x00:
|
|
if (svga->seqregs[1] & 8) /*Low res (320)*/
|
|
svga->render = svga_render_4bpp_lowres;
|
|
else {
|
|
svga->hdisp = svga->crtc[1] - ((svga->crtc[5] & 0x60) >> 5);
|
|
svga->hdisp++;
|
|
svga->hdisp *= 8;
|
|
|
|
if (svga->hdisp == 1280)
|
|
svga->rowoffset >>= 1;
|
|
|
|
svga->render = svga_render_4bpp_highres;
|
|
}
|
|
break;
|
|
case 0x20: /*4 colours*/
|
|
if (svga->seqregs[1] & 8) /*Low res (320)*/
|
|
svga->render = svga_render_2bpp_lowres;
|
|
else
|
|
svga->render = svga_render_2bpp_highres;
|
|
break;
|
|
case 0x40: case 0x60:
|
|
if (svga->crtc[0x19] & 2) {
|
|
svga->hdisp = svga->crtc[1] - ((svga->crtc[5] & 0x60) >> 5);
|
|
svga->hdisp++;
|
|
svga->hdisp *= (svga->seqregs[1] & 8) ? 16 : 8;
|
|
|
|
if (svga->hdisp == 1280) {
|
|
svga->hdisp >>= 1;
|
|
} else
|
|
svga->rowoffset <<= 1;
|
|
|
|
svga->render = svga_render_8bpp_highres;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void *
|
|
rtg_init(const device_t *info)
|
|
{
|
|
const char *fn;
|
|
rtg_t *dev;
|
|
|
|
dev = (rtg_t *)malloc(sizeof(rtg_t));
|
|
memset(dev, 0x00, sizeof(rtg_t));
|
|
dev->name = info->name;
|
|
dev->type = info->local;
|
|
fn = BIOS_ROM_PATH;
|
|
|
|
switch(dev->type) {
|
|
case 2: /* ISA RTG3106 */
|
|
dev->vram_size = device_get_config_int("memory") << 10;
|
|
video_inform(VIDEO_FLAG_TYPE_SPECIAL, &timing_rtg_isa);
|
|
svga_init(info, &dev->svga, dev, dev->vram_size,
|
|
rtg_recalctimings, rtg_in, rtg_out,
|
|
NULL, NULL);
|
|
io_sethandler(0x03c0, 32,
|
|
rtg_in,NULL,NULL, rtg_out,NULL,NULL, dev);
|
|
break;
|
|
}
|
|
|
|
dev->svga.bpp = 8;
|
|
dev->svga.miscout = 1;
|
|
|
|
dev->vram_mask = dev->vram_size - 1;
|
|
|
|
rom_init(&dev->bios_rom, (char *) fn,
|
|
0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL);
|
|
|
|
return(dev);
|
|
}
|
|
|
|
|
|
static void
|
|
rtg_close(void *priv)
|
|
{
|
|
rtg_t *dev = (rtg_t *)priv;
|
|
|
|
svga_close(&dev->svga);
|
|
|
|
free(dev);
|
|
}
|
|
|
|
|
|
static void
|
|
rtg_speed_changed(void *priv)
|
|
{
|
|
rtg_t *dev = (rtg_t *)priv;
|
|
|
|
svga_recalctimings(&dev->svga);
|
|
}
|
|
|
|
|
|
static void
|
|
rtg_force_redraw(void *priv)
|
|
{
|
|
rtg_t *dev = (rtg_t *)priv;
|
|
|
|
dev->svga.fullchange = changeframecount;
|
|
}
|
|
|
|
|
|
static int
|
|
rtg_available(void)
|
|
{
|
|
return rom_present(BIOS_ROM_PATH);
|
|
}
|
|
|
|
static const device_config_t rtg_config[] =
|
|
{
|
|
{
|
|
"memory", "Memory size", CONFIG_SELECTION, "", 1024, "", { 0 },
|
|
{
|
|
{
|
|
"256 KB", 256
|
|
},
|
|
{
|
|
"512 KB", 512
|
|
},
|
|
{
|
|
"1 MB", 1024
|
|
},
|
|
{
|
|
""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"", "", -1
|
|
}
|
|
};
|
|
|
|
const device_t realtek_rtg3106_device = {
|
|
"Realtek RTG3106 (ISA)",
|
|
DEVICE_ISA | DEVICE_AT,
|
|
2,
|
|
rtg_init, rtg_close, NULL,
|
|
{ rtg_available },
|
|
rtg_speed_changed,
|
|
rtg_force_redraw,
|
|
rtg_config
|
|
}; |