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Added basic emulation of ACC Micro 2036 chipset (used by Packard Bell Legend 300SX).

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This commit is contained in:
SarahW 2018-02-12 15:55:25 +00:00
commit 72c2cb6f7d
13 changed files with 112 additions and 9 deletions
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src/acc2036.c Normal file
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#include "ibm.h"
#include "acc2036.h"
#include "io.h"
#include "mem.h"
static struct
{
int reg_idx;
uint8_t regs[256];
} acc2036;
static void acc2036_shadow_recalc()
{
if (acc2036.regs[0x2c] & 8)
{
switch (acc2036.regs[0x22] & 3)
{
case 0:
mem_set_mem_state(0xf0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
break;
case 1:
mem_set_mem_state(0xf0000, 0x10000, MEM_READ_INTERNAL | MEM_WRITE_EXTERNAL);
break;
case 2:
mem_set_mem_state(0xf0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_INTERNAL);
break;
case 3:
mem_set_mem_state(0xf0000, 0x10000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
break;
}
}
else
mem_set_mem_state(0xf0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
if (acc2036.regs[0x2c] & 4)
{
switch (acc2036.regs[0x22] & 3)
{
case 0:
mem_set_mem_state(0xe0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
break;
case 1:
mem_set_mem_state(0xe0000, 0x10000, MEM_READ_INTERNAL | MEM_WRITE_EXTERNAL);
break;
case 2:
mem_set_mem_state(0xe0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_INTERNAL);
break;
case 3:
mem_set_mem_state(0xe0000, 0x10000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
break;
}
}
else
mem_set_mem_state(0xe0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
}
static void acc2036_write(uint16_t addr, uint8_t val, void *p)
{
if (!(addr & 1))
acc2036.reg_idx = val;
else
{
acc2036.regs[acc2036.reg_idx] = val;
// pclog("Write ACC2036 R%02x %02x %04x:%04x %i\n", acc2036.reg_idx, val, CS,cpu_state.pc, ins);
switch (acc2036.reg_idx)
{
case 0x22:
case 0x2c:
acc2036_shadow_recalc();
break;
case 0x23:
mem_mapping_disable(&ram_remapped_mapping);
if (val & 0x10)
{
if (acc2036.regs[0x2c] & 0xc)
mem_remap_top_256k();
else
mem_remap_top_384k();
}
break;
}
}
}
static uint8_t acc2036_read(uint16_t addr, void *p)
{
if (!(addr & 1))
return acc2036.reg_idx;
return acc2036.regs[acc2036.reg_idx];
}
void acc2036_init()
{
memset(&acc2036, 0, sizeof(acc2036));
io_sethandler(0x00f2, 0x0002, acc2036_read, NULL, NULL, acc2036_write, NULL, NULL, NULL);
}