fix potential adc overflow flag bug

1 files changed, 1 insertions, 1 deletions

diff --git a/cpu.c b/cpu.c
index 4aeaaf6..3bbfc42 100644
--- a/cpu.c
+++ b/cpu.c
@@ -120,7 +120,7 @@ adc(uint8_t arg)
 
         regs.status.carry = sum > 0xFF;
         /* overflow flag formula: https://stackoverflow.com/a/29224684 */
-        regs.status.overflow = ~(regs.a ^ arg) & (regs.a ^ sum) & 0x80;
+        regs.status.overflow = (~(regs.a ^ arg) & (regs.a ^ sum) & 0x80) > 0;
         STATUS_UPDATE_ZERO(regs.a);
         STATUS_UPDATE_NEGATIVE(regs.a);
 }