From 129fcff7e5203560371b9feb77d2f6cf539b9421 Mon Sep 17 00:00:00 2001 From: Oliver Schmidt Date: Tue, 21 May 2013 23:47:19 +0200 Subject: [PATCH] Fixed Carry handling in SBC opcode. --- src/sim65/6502.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/sim65/6502.c b/src/sim65/6502.c index bb357cbb7..f00aa3943 100644 --- a/src/sim65/6502.c +++ b/src/sim65/6502.c @@ -312,7 +312,7 @@ static unsigned HaveIRQRequest; SET_CF (res <= 0xFF); \ SET_OF (((old^rhs) & (old^res) & 0x80)); \ } else { \ - Regs.AC -= rhs - (!GET_CF ()); \ + Regs.AC -= rhs + (!GET_CF ()); \ TEST_ZF (Regs.AC); \ TEST_SF (Regs.AC); \ SET_CF (Regs.AC <= 0xFF); \ -- 2.39.5