PCE: Fixed bug in indirect zero page wrapping logic

SourMesen · SourMesen · commit 735e428bf095 · 2025-07-03T20:08:32.000+09:00
Indirect zero page reads at $20FF would have been affected by this, but odds are that games never do this
diff --git a/Core/PCE/PceCpu.cpp b/Core/PCE/PceCpu.cpp
@@ -356,7 +356,7 @@ uint16_t PceCpu::ReadZeroPageWrap(uint8_t zero)
 {
 	if(zero == 0xFF) {
 		uint8_t lo = MemoryRead(PceCpu::ZeroPage + 0xFF);
-		uint8_t hi = (MemoryRead(PceCpu::ZeroPage + 0x00) << 8);
+		uint8_t hi = MemoryRead(PceCpu::ZeroPage + 0x00);
 		return lo | (hi << 8);
 	} else {
 		return MemoryReadWord(PceCpu::ZeroPage + zero);

Original file line number	Diff line number	Diff line change
`@@ -356,7 +356,7 @@ uint16_t PceCpu::ReadZeroPageWrap(uint8_t zero)`
`356`	`356`	`{`
`357`	`357`	`if(zero == 0xFF) {`
`358`	`358`	`uint8_t lo = MemoryRead(PceCpu::ZeroPage + 0xFF);`
`359`		`- uint8_t hi = (MemoryRead(PceCpu::ZeroPage + 0x00) << 8);`
	`359`	`+ uint8_t hi = MemoryRead(PceCpu::ZeroPage + 0x00);`
`360`	`360`	`return lo \| (hi << 8);`
`361`	`361`	`} else {`
`362`	`362`	`return MemoryReadWord(PceCpu::ZeroPage + zero);`