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Added emulation of Packard Bell PB410A, along with the built-in Headland HT216-32 video.

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This commit is contained in:
SarahW 2019-04-03 21:32:48 +01:00
commit 35962551dd
18 changed files with 1178 additions and 13 deletions
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119
src/acc2168.c Normal file
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#include "ibm.h"
#include "acc2168.h"
#include "cpu.h"
#include "io.h"
#include "mem.h"
#include "x86.h"
static struct
{
int reg_idx;
uint8_t regs[256];
uint8_t port_62;
} acc2168;
static void acc2168_shadow_recalc()
{
if (acc2168.regs[0x02] & 8)
{
switch (acc2168.regs[0x02] & 0x30)
{
case 0x00:
mem_set_mem_state(0xf0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_INTERNAL);
break;
case 0x10:
mem_set_mem_state(0xf0000, 0x10000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
break;
case 0x20:
mem_set_mem_state(0xf0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
break;
case 0x30:
mem_set_mem_state(0xf0000, 0x10000, MEM_READ_INTERNAL | MEM_WRITE_EXTERNAL);
break;
}
}
else
mem_set_mem_state(0xf0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
if (acc2168.regs[0x02] & 4)
{
switch (acc2168.regs[0x02] & 0x30)
{
case 0x00:
mem_set_mem_state(0xe0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_INTERNAL);
break;
case 0x10:
mem_set_mem_state(0xe0000, 0x10000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
break;
case 0x20:
mem_set_mem_state(0xe0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
break;
case 0x30:
mem_set_mem_state(0xe0000, 0x10000, MEM_READ_INTERNAL | MEM_WRITE_EXTERNAL);
break;
}
}
else
mem_set_mem_state(0xe0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
}
static void acc2168_write(uint16_t addr, uint8_t val, void *p)
{
// pclog("acc2168_write: addr=%04x val=%02x\n", addr, val);
if (!(addr & 1))
acc2168.reg_idx = val;
else
{
acc2168.regs[acc2168.reg_idx] = val;
// pclog("acc2168_write: idx=%02x val=%02x %04x:%04x\n", acc2168.reg_idx, val, CS,cpu_state.pc);
switch (acc2168.reg_idx)
{
case 0x02:
acc2168_shadow_recalc();
break;
}
}
}
static uint8_t acc2168_read(uint16_t addr, void *p)
{
if (!(addr & 1))
return acc2168.reg_idx;
// pclog("acc2168_read: idx=%02x val=%02x\n", acc2168.reg_idx, acc2168.regs[acc2168.reg_idx]);
return acc2168.regs[acc2168.reg_idx];
}
static uint8_t port78_read(uint16_t addr, void *p)
{
return 0;
}
static uint8_t port92_read(uint16_t addr, void *p)
{
return acc2168.port_62 | 0xfc;
}
static void port92_write(uint16_t addr, uint8_t val, void *p)
{
if ((mem_a20_alt ^ val) & 2)
{
mem_a20_alt = val & 2;
mem_a20_recalc();
}
if ((~acc2168.port_62 & val) & 1)
{
softresetx86();
cpu_set_edx();
}
acc2168.port_62 = val | 0xfC;
}
void acc2168_init()
{
memset(&acc2168, 0, sizeof(acc2168));
io_sethandler(0x00f2, 0x0002, acc2168_read, NULL, NULL, acc2168_write, NULL, NULL, NULL);
io_sethandler(0x0078, 0x0001, port78_read, NULL, NULL, NULL, NULL, NULL, NULL);
io_sethandler(0x0092, 0x0001, port92_read, NULL, NULL, port92_write, NULL, NULL, NULL);
}