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Add Amstrad PC5086 emulation. Patch from davide78.

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This commit is contained in:
SarahW 2020-11-15 11:11:41 +00:00
commit a89347d415
18 changed files with 428 additions and 132 deletions
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60
src/superxt.c Normal file
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/*This is the Chips and Technologies C82100 chipset used in the Amstrad PC5086 model*/
#include "ibm.h"
#include "io.h"
#include "x86.h"
#include "superxt.h"
static uint8_t superxt_regs[256];
static int superxt_index;
static int superxt_emspage[4];
void superxt_write(uint16_t port, uint8_t val, void *priv)
{
switch (port)
{
case 0x22:
superxt_index = val;
break;
case 0x23:
superxt_regs[superxt_index] = val;
case 0x0208: case 0x4208: case 0x8208: case 0xC208:
superxt_emspage[port >> 14] = val;
break;
// default:
// pclog("%04X:%04X SUPERXT WRITE : %04X, %02X\n", CS, cpu_state.pc, port, val);
}
}
uint8_t superxt_read(uint16_t port, void *priv)
{
switch (port)
{
case 0x22:
return superxt_index;
case 0x23:
return superxt_regs[superxt_index];
case 0x0208: case 0x4208: case 0x8208: case 0xC208:
return superxt_emspage[port >> 14];
// default:
// pclog("%04X:%04X SUPERXT READ : %04X\n", CS, cpu_state.pc, port);
}
return 0xff;
}
void superxt_init()
{
/* Set register 0x42 to invalid configuration at startup */
superxt_regs[0x42] = 0;
io_sethandler(0x0022, 0x0002, superxt_read, NULL, NULL, superxt_write, NULL, NULL, NULL);
io_sethandler(0x0208, 0x0001, superxt_read, NULL, NULL, superxt_write, NULL, NULL, NULL);
io_sethandler(0x4208, 0x0001, superxt_read, NULL, NULL, superxt_write, NULL, NULL, NULL);
io_sethandler(0x8208, 0x0001, superxt_read, NULL, NULL, superxt_write, NULL, NULL, NULL);
io_sethandler(0xc208, 0x0001, superxt_read, NULL, NULL, superxt_write, NULL, NULL, NULL);
}