diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 16b76ac3..3169899d 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -1247,16 +1247,11 @@ HB_CPU1:
 	; SETUP PERIODIC TIMER INTERRUPT ON TIMER 0
 ;	LD	HL,CPUOSC/TICKSPERSEC/20-1	; 50HZ = 18432000 / 50 / 20
 	LD	HL,(CPUKHZ)		; 50HZ = 18432000 / 20 / 50 / X, SO X = CPU KHZ
-	LD	B,0			; 16-BIT I/O ADDRESS
-	LD	C,Z180_TMDR0L		; INITIALIZE TIMER 0 DATA REGISTER
-	OUT	(C),L
-	INC	C
-	OUT	(C),H
 	DEC	HL			; RELOAD OCCURS *AFTER* ZERO
-	LD	C,Z180_RLDR0L		; INITIALIZE TIMER 0 RELOAD REGISTER
-	OUT	(C),L
-	INC	C
-	OUT	(C),H
+	OUT0	(Z180_TMDR0L),L		; INITIALIZE TIMER 0 DATA REGISTER
+	OUT0	(Z180_TMDR0H),H
+	OUT0	(Z180_RLDR0L),L		; INITIALIZE TIMER 0 RELOAD REGISTER
+	OUT0	(Z180_RLDR0H),H
 	LD	A,%00010001		; ENABLE TIMER0 INT AND DOWN COUNTING
 	OUT0	(Z180_TCR),A
 ;