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Add mapper 422.3. Correct multicart registers of mapper 219.

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This commit is contained in:
NewRisingSun
2025-09-17 19:46:40 +02:00
parent fc9d69430d
commit 1ac2f351ee
2 changed files with 25 additions and 14 deletions
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8
src/boards/126_422_534.c
View File

@@ -51,6 +51,10 @@ static void wrapPRG(uint32 A, uint8 V) {
int prgOR =(EXPREGS[0] <<4 &0x70 | (EXPREGS[0] ^0x20) <<3 &0x180) &~prgAND; /* Outer PRG bank */
if (submapper ==1) prgOR =prgOR &0x7F | prgOR >>1 &0x80; /* Submapper 1 uses PRG A21 as a chip select between two 1 MiB chips */
if (submapper ==2) prgOR =prgOR &0x7F | EXPREGS[1] <<5 &0x80; /* Submapper 2 uses 6001.2 (not documented in datasheet) as a chip select between two 1 MiB chips */
if (submapper ==3 && EXPREGS[0] &0x04) { /* Submapper 3 replace PRG A14 with PRG A21 */
prgAND &=~0x02;
prgOR |= EXPREGS[0] &0x20? 0x00: 0x02;
}
for (A =0; A <4; A++) {
/* In UNROM-like mode (CT3=1, CT2=1, CT0=1), MMC3 sees A13=0 and A14=CPU A14 during reads, making register 6 apply from $8000-$BFFF, and the fixed bank from $C000-$FFFF.
In NROM-128, NROM-256, ANROM and UNROM modes (CT0=1), MMC3 sees A13=0 and A14=0, making register 6 apply from $8000-$FFFF. */
@@ -80,6 +84,10 @@ static void wrapCHR(uint32 A, uint8 V) {
else
chrOR =((EXPREGS[0] ^0x20) <<4 &0x380 | EXPREGS[0] <<8 &0x400) &~chrAND;
if (submapper ==3 && EXPREGS[0] &0x04) { /* Submapper 3 replace CHR A14 with PRG A21 */
chrAND &=~0x10;
chrOR |= EXPREGS[0] &0x20? 0x00: 0x10;
}
if (EXPREGS[3] &0x10) /* CNROM mode: 8 KiB inner CHR bank comes from outer bank register #2 */
setchr8(EXPREGS[2] &(chrAND >>3) | (chrOR &~chrAND) >>3);
else /* MMC3 CHR mode */

31
src/boards/a9746.c
View File

@@ -22,18 +22,19 @@
#include "mmc3.h"
static void UNLA9746PWrap(uint32 A, uint8 V) {
setprg8(A, EXPREGS[1] <<4 | V &0x0F);
int prgAND = EXPREGS[0] &0x40? 0x0F: 0x1F;
int prgOR = EXPREGS[0] <<4 &0x10 | EXPREGS[1] &0x20;
setprg8(A, V &prgAND | prgOR &~prgAND);
}
static void UNLA9746CWrap(uint32 A, uint8 V) {
setchr1(A, EXPREGS[1] <<7 | V &0x7F);
int chrAND = EXPREGS[0] &0x80? 0x7F: 0xFF;
int chrOR = EXPREGS[0] <<4 &0x80 | EXPREGS[1] <<3 &0x100;
setchr1(A, V &chrAND | chrOR &~chrAND);
}
static DECLFW(UNLA9746WriteOuter) {
switch(A &1) {
case 0: EXPREGS[1] =EXPREGS[1] &~1 | V >>3 &1; break;
case 1: EXPREGS[1] =EXPREGS[1] &~2 | V >>4 &2; break;
}
EXPREGS[A &1] = V;
FixMMC3PRG(MMC3_cmd);
FixMMC3CHR(MMC3_cmd);
}
@@ -43,7 +44,7 @@ static DECLFW(UNLA9746WriteASIC) {
if (A &1)
{ /* Register data */
if (~EXPREGS[0] &0x20)
if (~EXPREGS[2] &0x20)
{ /* Scrambled mode inactive */
MMC3_CMDWrite(A, V);
}
@@ -75,7 +76,7 @@ static DECLFW(UNLA9746WriteASIC) {
else
{ /* Register index */
MMC3_CMDWrite(A, V);
if (A &2) EXPREGS[0] =V;
if (A &2) EXPREGS[2] =V;
}
}
@@ -83,23 +84,25 @@ static void UNLA9746Power(void) {
GenMMC3Power();
SetWriteHandler(0x5000, 0x5FFF, UNLA9746WriteOuter);
SetWriteHandler(0x8000, 0xBFFF, UNLA9746WriteASIC);
EXPREGS[0] = 0;
EXPREGS[1] = 3;
EXPREGS[0] = 0x00;
EXPREGS[1] = 0x20;
EXPREGS[2] = 0x00;
MMC3RegReset();
}
static void UNLA9746Reset(void) {
EXPREGS[0] = 0;
EXPREGS[1] = 3;
EXPREGS[0] = 0x00;
EXPREGS[1] = 0x20;
EXPREGS[2] = 0x00;
MMC3RegReset();
}
void UNLA9746_Init(CartInfo *info) {
GenMMC3_Init(info, 128, 128, 0, 0);
GenMMC3_Init(info, 256, 256, 0, 0);
pwrap = UNLA9746PWrap;
cwrap = UNLA9746CWrap;
info->Power = UNLA9746Power;
info->Reset = UNLA9746Reset;
AddExState(EXPREGS, 2, 0, "EXPR");
AddExState(EXPREGS, 3, 0, "EXPR");
}