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Mapper 277: The UNROM game must take its mirroring from the NES header.

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NewRisingSun
2025-10-20 21:28:45 +02:00
parent dc3b3842f1
commit 0d3b44c99c
1 changed files with 7 additions and 1 deletions
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8
src/boards/277.c
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@@ -22,6 +22,8 @@
#include "mapinc.h" #include "mapinc.h"
#include "latch.h" #include "latch.h"
static uint8 inesMirroring;
static void Sync(void) { static void Sync(void) {
if (!(latch.data & 1) && (latch.data & 8)) { if (!(latch.data & 1) && (latch.data & 8)) {
setprg16(0x8000, latch.data & ~1); setprg16(0x8000, latch.data & ~1);
@@ -36,7 +38,10 @@ static void Sync(void) {
} }
} }
setchr8(0); setchr8(0);
setmirror(((latch.data >> 4) & 1) ^ 1); if (latch.data &8)
setmirror(latch.data &0x10? MI_H: MI_V);
else
setmirror(inesMirroring); /* The UNROM game's mirroring is set via solder pad and not via hardware register, so use the mirroring setting from the iNES header. */
} }
static DECLFW(M277Write) { static DECLFW(M277Write) {
@@ -58,6 +63,7 @@ static void M277Reset() {
} }
void Mapper277_Init(CartInfo *info) { void Mapper277_Init(CartInfo *info) {
inesMirroring = info->mirror;
Latch_Init(info, Sync, NULL, 0, 0); Latch_Init(info, Sync, NULL, 0, 0);
info->Power = M277Power; info->Power = M277Power;
info->Reset = M277Reset; info->Reset = M277Reset;