144 lines
2.6 KiB
C
144 lines
2.6 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 Sierra SC11483 and SC11487 RAMDACs.
|
|
*
|
|
* Used by the S3 911 and 924 chips.
|
|
*
|
|
*
|
|
*
|
|
* Authors: TheCollector1995, <mariogplayer90@gmail.com>
|
|
*
|
|
* Copyright 2020 TheCollector1995.
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <wchar.h>
|
|
#include <86box/86box.h>
|
|
#include <86box/device.h>
|
|
#include <86box/mem.h>
|
|
#include <86box/timer.h>
|
|
#include <86box/video.h>
|
|
#include <86box/vid_svga.h>
|
|
|
|
|
|
typedef struct
|
|
{
|
|
int type;
|
|
int state;
|
|
uint8_t ctrl;
|
|
} sc1148x_ramdac_t;
|
|
|
|
|
|
void
|
|
sc1148x_ramdac_out(uint16_t addr, uint8_t val, void *p, svga_t *svga)
|
|
{
|
|
sc1148x_ramdac_t *ramdac = (sc1148x_ramdac_t *) p;
|
|
|
|
switch (addr) {
|
|
case 0x3C6:
|
|
if (ramdac->state == 4) {
|
|
ramdac->state = 0;
|
|
ramdac->ctrl = val;
|
|
if (ramdac->ctrl & 0x80) {
|
|
if (ramdac->ctrl & 0x40)
|
|
svga->bpp = 16;
|
|
else
|
|
svga->bpp = 15;
|
|
} else {
|
|
svga->bpp = 8;
|
|
}
|
|
svga_recalctimings(svga);
|
|
return;
|
|
}
|
|
ramdac->state = 0;
|
|
break;
|
|
case 0x3C7:
|
|
case 0x3C8:
|
|
case 0x3C9:
|
|
ramdac->state = 0;
|
|
break;
|
|
}
|
|
|
|
svga_out(addr, val, svga);
|
|
}
|
|
|
|
|
|
uint8_t
|
|
sc1148x_ramdac_in(uint16_t addr, void *p, svga_t *svga)
|
|
{
|
|
sc1148x_ramdac_t *ramdac = (sc1148x_ramdac_t *) p;
|
|
uint8_t temp = svga_in(addr, svga);
|
|
|
|
switch (addr) {
|
|
case 0x3C6:
|
|
if (ramdac->state == 4) {
|
|
ramdac->state = 0;
|
|
temp = ramdac->ctrl;
|
|
|
|
if (ramdac->type == 1) {
|
|
if (ramdac->ctrl & 0x80)
|
|
temp |= 1;
|
|
else
|
|
temp &= ~1;
|
|
}
|
|
break;
|
|
}
|
|
|
|
ramdac->state++;
|
|
break;
|
|
case 0x3C7:
|
|
case 0x3C8:
|
|
case 0x3C9:
|
|
ramdac->state = 0;
|
|
break;
|
|
}
|
|
|
|
return temp;
|
|
}
|
|
|
|
|
|
static void *
|
|
sc1148x_ramdac_init(const device_t *info)
|
|
{
|
|
sc1148x_ramdac_t *ramdac = (sc1148x_ramdac_t *) malloc(sizeof(sc1148x_ramdac_t));
|
|
memset(ramdac, 0, sizeof(sc1148x_ramdac_t));
|
|
|
|
ramdac->type = info->local;
|
|
|
|
return ramdac;
|
|
}
|
|
|
|
|
|
static void
|
|
sc1148x_ramdac_close(void *priv)
|
|
{
|
|
sc1148x_ramdac_t *ramdac = (sc1148x_ramdac_t *) priv;
|
|
|
|
if (ramdac)
|
|
free(ramdac);
|
|
}
|
|
|
|
const device_t sc11483_ramdac_device =
|
|
{
|
|
"Sierra SC11483 RAMDAC",
|
|
0, 0,
|
|
sc1148x_ramdac_init, sc1148x_ramdac_close,
|
|
NULL, NULL, NULL, NULL
|
|
};
|
|
|
|
const device_t sc11487_ramdac_device =
|
|
{
|
|
"Sierra SC11487 RAMDAC",
|
|
0, 1,
|
|
sc1148x_ramdac_init, sc1148x_ramdac_close,
|
|
NULL, NULL, NULL, NULL
|
|
};
|