diff --git a/SYS/KERNEL.S.INIT.txt b/SYS/KERNEL.S.INIT.txt
index d1e27511..95637c81 100644
--- a/SYS/KERNEL.S.INIT.txt
+++ b/SYS/KERNEL.S.INIT.txt
@@ -460,6 +460,10 @@ CPU.Init.6502	>PUSHWI MSG.CPU
 				php
 				sei
 
+				lda A2osX.HZ			if 50hz -> 6 loops
+				eor #3					if 60hz -> 5 loops
+				pha
+
 				clc
 				lda MACHID
 				and #MACHID.T
@@ -478,23 +482,26 @@ CPU.Init.6502	>PUSHWI MSG.CPU
 				sta IO.IIC.ENVBL
 				lda IO.IIC.CLRVBLIRQ
 				
+				ldx #2
+				
 .11				bit VBL
 				bpl .11
 				
+				dex
+				
 				bit ZPPtr1				//c ?
 				bpl .2
 				
 				lda IO.IIC.CLRVBLIRQ	yes, clear IRQ
-				lda #0
-				bra .21
+
+				lda #0					A = LOW
+				bra .22
 
 .2				lda VBL
 				bmi .2
-
-.21				ldx #2					A = LOW
-				ldy A2osX.HZ
 *--------------------------------------
-.20				tya
+.20				ply
+				phy
 
 .22				nop						(2)
 				nop						(2)
@@ -539,7 +546,7 @@ CPU.Init.6502	>PUSHWI MSG.CPU
 
 				nop 					(2) 3+2+2+2+2 if from BNE
 				
-.6				dec
+.6				dey
 				bne .22
 				
 				eor VBL					(4)
@@ -551,15 +558,17 @@ CPU.Init.6502	>PUSHWI MSG.CPU
 .3				dex
 				bne .20
 				bra .60
-*--------------------------------------
+
 .31				lda IO.IIC.CLRVBLIRQ		yes, clear IRQ
 				
 				bit ZPPtr1+1				Disable VBLIRQ ?
 				bpl .60
 				
 				sta IO.IIC.DISVBL
+*--------------------------------------
+.60				ply
 
-.60				stz A2osX.CPUSPEED
+				stz A2osX.CPUSPEED
 
 .7				sec
 				lda A2osX.RANDOM16