diff --git a/c64/kernal/iec_tx_byte.s b/c64/kernal/iec_tx_byte.s
index 7859b2f8..ed5ffb4f 100644
--- a/c64/kernal/iec_tx_byte.s
+++ b/c64/kernal/iec_tx_byte.s
@@ -62,7 +62,7 @@ iec_tx_byte_l1:
 	;; More bits to send?
 	pla
 	dex
-	bpl iec_tx_byte_nextbit
+	bne iec_tx_byte_nextbit
 
 	;; Done sending bits. Wait for acknowledgement
 	jsr iec_assert_clk_release_data
diff --git a/c64/kernal/iec_wait20us.s b/c64/kernal/iec_wait20us.s
index e406780f..86456409 100644
--- a/c64/kernal/iec_wait20us.s
+++ b/c64/kernal/iec_wait20us.s
@@ -2,6 +2,6 @@
 iec_wait20us:	
 	;; Wait 20usec
 	;; JSR + RTS already costs 12, so need only 8 more
-	ldx $dd00
-	ldx $dd00
+	ldy $dd00
+	ldy $dd00
 	rts