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Mapper 289: Support Super 76-in-1 Contra

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NewRisingSun
2022-03-01 17:33:39 +01:00
parent 7a9a044d22
commit 95b79c4745
1 changed files with 22 additions and 50 deletions
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72
src/boards/bmc60311c.c
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@@ -24,79 +24,51 @@
#include "mapinc.h"
static uint8 inner_bank, outer_bank, mode;
static uint8 latch, reg[2];
static SFORMAT StateRegs[] =
{
{ &inner_bank, 1, "INB0" },
{ &outer_bank, 1, "OUTB" },
{ &mode, 1, "MODE" },
{ &latch, 1, "LATC" },
{ reg, 2, "REGS" },
{ 0 }
};
static void Sync(void) {
uint8 bbank = (mode & 4) ? 0 : (inner_bank & 7);
uint8 bank = outer_bank | bbank;
uint8 preg[2];
/* 0: NROM-128: Same inner/outer 16 KiB bank at CPU $8000-$BFFF
* and $C000-$FFFF
* 1: NROM-256: 32 kiB bank at CPU $8000-$FFFF (Selected inner/outer bank SHR 1)
* 2: UNROM: Inner/outer bank at CPU $8000-BFFF,
* fixed inner bank 7 within outer bank at $C000-$FFFF
* 3: Unknown
*
* The combined inner/outer bank is simply the inner bank, selected by the
* latch at $8000-$FFFF (or 0 if the latch is disabled) ORed with the
* outer bank selected by $6001, without any bit shifting.
*/
preg[0] = bank;
preg[1] = 0;
switch (mode & 3) {
case 0x00:
case 0x01:
preg[1] = bank | ((mode & 1) ? 1 : 0);
break;
case 0x02:
preg[1] = outer_bank | 7;
case 0x03:
break;
if (reg[0] &2) { /* UNROM */
setprg16(0x8000, latch &7 | reg[1] &~7);
setprg16(0xC000, 7 | reg[1] &~7);
} else
if (reg[0] &1) /* NROM-256 */
setprg32(0x8000, reg[1] >>1);
else { /* NROM-128 */
setprg16(0x8000, reg[1]);
setprg16(0xC000, reg[1]);
}
SetupCartCHRMapping(0, CHRptr[0], 0x2000, !(reg[0] &4)); /* CHR-RAM write-protect */
setchr8(0);
setprg16(0x8000, preg[0]);
setprg16(0xC000, preg[1]);
setmirror(((mode & 8) >> 3) ^ 1);
setmirror(!(reg[0] &8));
}
static DECLFW(Write0) {
mode = V;
static DECLFW(WriteReg) {
reg[A &1] =V;
Sync();
}
static DECLFW(Write1) {
outer_bank = V;
Sync();
}
static DECLFW(Write8) {
inner_bank = V;
static DECLFW(WriteLatch) {
latch = V;
Sync();
}
static void BMC60311CPower(void) {
inner_bank = outer_bank = mode = 0;
latch =reg[0] =reg[1] =0;
Sync();
SetReadHandler(0x8000, 0xFFFF, CartBR);
SetWriteHandler(0x6000, 0x6000, Write0);
SetWriteHandler(0x6001, 0x6001, Write1);
SetWriteHandler(0x8000, 0xFFFF, Write8);
SetWriteHandler(0x6000, 0x6001, WriteReg);
SetWriteHandler(0x8000, 0xFFFF, WriteLatch);
}
static void BMC60311CReset(void) {
inner_bank = outer_bank = mode = 0;
latch =reg[0] =reg[1] =0;
Sync();
}