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Properly fixed the IBM PS/2 Model 55SX, required reverting some keyboard controller changes and changes to the implementation of the memory control POS registers.

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This commit is contained in:
OBattler
2021-12-08 22:05:55 +01:00
parent 5c6442e755
commit bcf96bd913
2 changed files with 25 additions and 21 deletions
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36
src/machine/m_ps2_mca.c
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@@ -202,7 +202,7 @@ static uint32_t ps2_read_cache_raml(uint32_t addr, void *priv)
}
static void ps2_write_cache_ram(uint32_t addr, uint8_t val, void *priv)
{
ps2_mca_log("ps2_write_cache_ram: addr=%08x val=%02x %04x:%04x %i\n", addr, val, CS,cpu_state.pc, ins);
ps2_mca_log("ps2_write_cache_ram: addr=%08x val=%02x %04x:%04x %i\n", addr, val, CS,cpu_state.pc);
ps2_cache[addr] = val;
}
@@ -402,10 +402,9 @@ static void model_50_write(uint16_t port, uint8_t val)
static void model_55sx_mem_recalc(void)
{
int i, j, state, enabled_mem = 0;
/* WARNING: Undocumented behavior - when bit 3 of POS5 is set (ie. memory has been configured),
bit 1 of POS5 behaves like bit 4. */
int base = 0, remap_size = (ps2.option[3] & 0x11) ? 384 : 256;
int bit_mask = 0x00;
int base = 0, remap_size = (ps2.option[3] & 0x10) ? 384 : 256;
int bit_mask = 0x00, max_rows = 4;
int bank_to_rows[16] = { 4, 2, 1, 0, 0, 2, 1, 0, 0, 0, 0, 0, 0, 2, 1, 0 };
ps2_mca_log("%02X %02X\n", ps2.option[1], ps2.option[3]);
@@ -413,15 +412,14 @@ static void model_55sx_mem_recalc(void)
mem_set_mem_state(0x00000000, (mem_size + 384) * 1024, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
mem_set_mem_state(0x000e0000, 0x00020000, MEM_READ_EXTANY | MEM_WRITE_DISABLED);
if (!(ps2.option[3] & 0x08))
{
ps2_mca_log("Memory not yet configured\n");
return;
}
for (i = 0; i < 2; i++)
{
for (j = 0; j < 4; j++)
max_rows = bank_to_rows[(ps2.memory_bank[i] >> 4) & 0x0f];
if (max_rows == 0)
continue;
for (j = 0; j < max_rows; j++)
{
if (ps2.memory_bank[i] & (1 << j)) {
ps2_mca_log("Set memory at %06X-%06X to internal\n", (base * 1024), (base * 1024) + (((base > 0) ? 1024 : 640) * 1024) - 1);
@@ -435,7 +433,7 @@ static void model_55sx_mem_recalc(void)
ps2_mca_log("Enabled memory: %i kB (%02X)\n", enabled_mem, bit_mask);
if (ps2.option[3] & 0x11)
if (ps2.option[3] & 0x10)
{
/* Enable ROM. */
ps2_mca_log("Enable ROM\n");
@@ -444,7 +442,7 @@ static void model_55sx_mem_recalc(void)
else
{
/* Disable ROM. */
if ((ps2.option[1] & 1) && !(ps2.option[3] & 0x20) && (bit_mask & 0x01) && (ps2.option[3] & 0x08))
if ((ps2.option[1] & 1) && !(ps2.option[3] & 0x20) && (bit_mask & 0x01))
{
/* Disable RAM between 640 kB and 1 MB. */
ps2_mca_log("Disable ROM, enable RAM\n");
@@ -462,9 +460,15 @@ static void model_55sx_mem_recalc(void)
mem_set_mem_state(0xe0000, 0x20000, state);
/* if (!(ps2.option[3] & 0x08))
{
ps2_mca_log("Memory not yet configured\n");
return;
} */
ps2_mca_log("Enable shadow mapping at %06X-%06X\n", (mem_size * 1024), (mem_size * 1024) + (remap_size * 1024) - 1);
if ((ps2.option[1] & 1) && !(ps2.option[3] & 0x20)) {
if ((ps2.option[1] & 1) && !(ps2.option[3] & 0x20) && (bit_mask & 0x01)) {
ps2_mca_log("Set memory at %06X-%06X to internal\n", (mem_size * 1024), (mem_size * 1024) + (remap_size * 1024) - 1);
mem_set_mem_state(mem_size * 1024, remap_size * 1024, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
}
@@ -942,7 +946,7 @@ static void ps2_mca_board_model_55sx_init()
ps2.option[1] = 0x00;
ps2.option[2] = 0x00;
ps2.option[3] = 0x30;
ps2.option[3] = 0x10;
memset(ps2.memory_bank, 0xf0, 8);
switch (mem_size/1024)