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Added PS/2 Model 80 (type 2) emulation.

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This commit is contained in:
SarahW 2017-04-17 22:24:11 +01:00
commit 221df09912
14 changed files with 286 additions and 5 deletions
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101
src/ps2_nvr.c Normal file
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#include <stdlib.h>
#include "ibm.h"
#include "device.h"
#include "io.h"
#include "ps2_nvr.h"
typedef struct ps2_nvr_t
{
int addr;
uint8_t ram[8192];
} ps2_nvr_t;
static uint8_t ps2_nvr_read(uint16_t port, void *p)
{
ps2_nvr_t *nvr = (ps2_nvr_t *)p;
switch (port)
{
case 0x74:
return nvr->addr & 0xff;
case 0x75:
return nvr->addr >> 8;
case 0x76:
return nvr->ram[nvr->addr];
}
return 0xff;
}
static void ps2_nvr_write(uint16_t port, uint8_t val, void *p)
{
ps2_nvr_t *nvr = (ps2_nvr_t *)p;
// pclog("ps2_nvr_write: port=%04x val=%02x\n", port, val);
switch (port)
{
case 0x74:
nvr->addr = (nvr->addr & 0x1f00) | val;
break;
case 0x75:
nvr->addr = (nvr->addr & 0xff) | ((val & 0x1f) << 8);
break;
case 0x76:
nvr->ram[nvr->addr] = val;
break;
}
}
static void *ps2_nvr_init()
{
ps2_nvr_t *nvr = (ps2_nvr_t *)malloc(sizeof(ps2_nvr_t));
FILE *f = NULL;
memset(nvr, 0, sizeof(ps2_nvr_t));
io_sethandler(0x0074, 0x0003, ps2_nvr_read, NULL, NULL, ps2_nvr_write, NULL, NULL, nvr);
switch (romset)
{
case ROM_IBMPS2_M80: f = romfopen("nvr/ibmps2_m80_sec.nvr", "rb"); break;
}
if (f)
{
fread(nvr->ram, 8192, 1, f);
fclose(f);
}
else
memset(nvr->ram, 0xFF, 8192);
return nvr;
}
static void ps2_nvr_close(void *p)
{
ps2_nvr_t *nvr = (ps2_nvr_t *)p;
FILE *f = NULL;
switch (romset)
{
case ROM_IBMPS2_M80: f = romfopen("nvr/ibmps2_m80_sec.nvr", "wb"); break;
}
if (f)
{
fwrite(nvr->ram, 8192, 1, f);
fclose(f);
}
free(nvr);
}
device_t ps2_nvr_device =
{
"PS/2 NVRRAM",
0,
ps2_nvr_init,
ps2_nvr_close,
NULL,
NULL,
NULL,
NULL
};