emu_nes

commit 81575946ae0d3e61d45b9c4a34785bf203955cee
parent 70937cd61f63e159d5de226fa640d102c8fb0d14
Author: vin <git@vineetk.net>
Date:   Sat, 20 Jul 2024 21:18:11 -0400

fix status flag bug in ASL and ROL

Diffstat:
M
cpu.c
 | 
5
+++--

1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/cpu.c b/cpu.c
@@ -204,7 +204,8 @@ ASL(uint16_t mem)
 	memwrite(mem, tmp & 0xFF);
 
 	regs.status.carry = tmp > 0xFF;
-	STATUS_UPDATE_NZ(tmp);
+	regs.status.negative = (tmp & (1 << 7)) != 0;
+	regs.status.zero = (tmp << 1 & 0xFF) == 0;
 }
 
 void
@@ -536,7 +537,7 @@ ROL(uint16_t mem)
 	memwrite(mem, tmp);
 
 	regs.status.carry = carry;
-	STATUS_UPDATE_NZ(regs.a);
+	STATUS_UPDATE_NZ(tmp);
 }
 
 void