more operations, better debugging

2019-12-26 12:23:19 +01:00
parent 9a2dd87b2b
commit b04df12abb
2 changed files with 10 additions and 2 deletions
--- a/src/nes/cpu.rs
+++ b/src/nes/cpu.rs
@@ -454,8 +454,12 @@ impl CPU {
        unimplemented!()
    }

-    fn op_INC<T: Memory>(&mut self, bus: &T, val: Word) {
-        unimplemented!()
+    fn op_INC<T: Memory>(&mut self, bus: &mut T, addr: Word) {
+        let val = self.readb(bus, addr);
+        let val = val.wrapping_add(1);
+        self.writeb(bus, addr, val);
+        self.set_flag(ZERO, val == 0);
+        self.set_flag(NEGATIVE, (val & 0x80) != 0)
    }

    fn op_INX<T: Memory>(&mut self, bus: &T) {