diff --git a/chips/m6522.h b/chips/m6522.h
index 678fe661..acb81869 100644
--- a/chips/m6522.h
+++ b/chips/m6522.h
@@ -407,10 +407,10 @@ static inline void _m6522_read_port_pins(m6522_t* c, uint64_t pins) {
     bool new_cb2 = 0 != (pins & M6522_CB2);
     c->pa.c1_triggered = (c->pa.c1_in != new_ca1) && ((new_ca1 && M6522_PCR_CA1_LOW_TO_HIGH(c)) || (!new_ca1 && M6522_PCR_CA1_HIGH_TO_LOW(c)));
     c->pa.c2_triggered = (c->pa.c2_in != new_ca2) && ((new_ca2 && M6522_PCR_CA2_LOW_TO_HIGH(c)) || (!new_ca2 && M6522_PCR_CA2_HIGH_TO_LOW(c)));
-    c->pb.c1_triggered = (c->pb.c1_in != new_cb1) && ((new_cb1 && M6522_PCR_CB1_LOW_TO_HIGH(c)) || (!new_ca1 && M6522_PCR_CB1_HIGH_TO_LOW(c)));
-    c->pb.c2_triggered = (c->pb.c2_in != new_cb2) && ((new_cb2 && M6522_PCR_CB2_LOW_TO_HIGH(c)) || (!new_ca2 && M6522_PCR_CB2_HIGH_TO_LOW(c)));
+    c->pb.c1_triggered = (c->pb.c1_in != new_cb1) && ((new_cb1 && M6522_PCR_CB1_LOW_TO_HIGH(c)) || (!new_cb1 && M6522_PCR_CB1_HIGH_TO_LOW(c)));
+    c->pb.c2_triggered = (c->pb.c2_in != new_cb2) && ((new_cb2 && M6522_PCR_CB2_LOW_TO_HIGH(c)) || (!new_cb2 && M6522_PCR_CB2_HIGH_TO_LOW(c)));
     c->pa.c1_in = new_ca1;
-    c->pa.c2_in = new_cb2;
+    c->pa.c2_in = new_ca2;
     c->pb.c1_in = new_cb1;
     c->pb.c2_in = new_cb2;