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Add v0.7 source

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TomW 2013-04-21 14:54:35 +01:00
commit 3c253c2cf8
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97
src/vid_pc1640.c Normal file
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/*PC1640 video emulation.
Mostly standard EGA, but with CGA & Hercules emulation*/
#include "ibm.h"
#include "video.h"
#include "vid_cga.h"
#include "vid_ega.h"
static int pc1640_cga=1;
void pc1640_out(uint16_t addr, uint8_t val)
{
switch (addr)
{
case 0x3DB:
pc1640_cga=val&0x40;
mem_removehandler(0xa0000, 0x20000, ega_read, NULL, NULL, ega_write, NULL, NULL);
mem_removehandler(0xb8000, 0x08000, cga_read, NULL, NULL, cga_write, NULL, NULL);
if (pc1640_cga)
mem_sethandler(0xb8000, 0x08000, cga_read, NULL, NULL, cga_write, NULL, NULL);
else
{
switch (gdcreg[6] & 0xC)
{
case 0x0: /*128k at A0000*/
mem_sethandler(0xa0000, 0x20000, ega_read, NULL, NULL, ega_write, NULL, NULL);
break;
case 0x4: /*64k at A0000*/
mem_sethandler(0xa0000, 0x10000, ega_read, NULL, NULL, ega_write, NULL, NULL);
break;
case 0x8: /*32k at B0000*/
mem_sethandler(0xb0000, 0x08000, ega_read, NULL, NULL, ega_write, NULL, NULL);
break;
case 0xC: /*32k at B8000*/
mem_sethandler(0xb8000, 0x08000, ega_read, NULL, NULL, ega_write, NULL, NULL);
break;
}
}
pclog("3DB write %02X\n", val);
return;
}
if (pc1640_cga) cga_out(addr,val);
else ega_out(addr,val);
}
uint8_t pc1640_in(uint16_t addr)
{
switch (addr)
{
}
if (pc1640_cga) return cga_in(addr);
else return ega_in(addr);
}
void pc1640_recalctimings()
{
if (pc1640_cga) cga_recalctimings();
else ega_recalctimings();
}
void pc1640_poll()
{
if (pc1640_cga) cga_poll();
else ega_poll();
}
int pc1640_init()
{
int r = ega_init();
pc1640_cga = 1;
mem_sethandler(0xb8000, 0x08000, cga_read, NULL, NULL, cga_write, NULL, NULL);
return r;
}
GFXCARD vid_pc1640 =
{
pc1640_init,
/*IO at 3Cx/3Dx*/
pc1640_out,
pc1640_in,
/*IO at 3Ax/3Bx*/
video_out_null,
video_in_null,
pc1640_poll,
pc1640_recalctimings,
ega_write,
video_write_null,
video_write_null,
ega_read,
video_read_null,
video_read_null
};