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Updates to mappers 268, 351 and 422 (#605)

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* M422: Fix an issue in CNROM mode.

* M351: Correct the emulation of Wai Wai World 2 in VRC4 mode.

* M268: Add Submappers 10/11.

* M422: Correct a problem with Super Mario Bros. 3.

---------

Co-authored-by: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
This commit is contained in:
NRS-NewRisingSun
2024-05-29 22:40:32 +02:00
committed by GitHub
parent 0dc5915f0b
commit c970bcc2b5
3 changed files with 27 additions and 6 deletions
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6
src/boards/351.c
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@@ -185,7 +185,9 @@ static DECLFW(writeMMC1) {
static DECLFW(writeVRC4) {
uint8 index;
A =A &0xF000 | (A &0x800? ((A &8? 1: 0) | (A &4? 2: 0)): ((A &4? 1: 0) | (A &8? 2: 0)));
if (~reg[2] &4) A =A &0xF800 | A >>1 &0x3FF; /* A2,A1 -> A1,A0 if 5002.2=1 */
A |=A >>2 &3; /* A3,A2 -> A1,A0 */
if (A &0x800) A =A >>1 &1 | A <<1 &2 | A &~3; /* A8==1 => Swap A1,A0 */
switch (A &0xF000) {
case 0x8000: case 0xA000:
VRC4_prg[A >>13 &1] =V;
@@ -216,7 +218,7 @@ static DECLFW(writeVRC4) {
}
break;
default:
index =(A -0xB000) >>11 | A >>1 &1;
index =(A -0xB000) >>11 &~1 | A >>1 &1;
if (A &1)
VRC4_chr[index] =VRC4_chr[index] & 0x0F | V <<4;
else