CSimulator: Fix how 'BIT n,(IX/Y+d)' affects bits 3 and 5 of the flags

skoolkid · Aug 13, 2024 · cca6324 · cca6324
1 parent 1943199
commit cca6324
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Showing 2 changed files with 3 additions and 1 deletion.
diff --git a/c/csimulator.c b/c/csimulator.c
@@ -1347,7 +1347,7 @@ static void bit_xy(CSimulatorObject* self, void* lookup, int args[]) {
     }
 #endif
     byte value = BIT[REG(F) & 1][b][PEEK(addr)];
-    LD(F, (value & 0xD7) + ((xy / 256) & 0x28));
+    LD(F, (value & 0xD7) + ((addr / 256) & 0x28));
 
     INC_R(2);
     INC_T(20);

diff --git a/sphinx/source/changelog.rst b/sphinx/source/changelog.rst
@@ -5,6 +5,8 @@ Changelog
 -----
 * Fixed how the 'ADC A,*', 'SBC A,*', 'ADC HL,rr' and 'SBC HL,rr' instructions
   affect the half-carry flag
+* Fixed how 'BIT n,(IX/Y+d)' affects bits 3 and 5 of the flags in the C version
+  of the Z80 simulator
 
 9.3 (2024-08-10)
 ----------------