NEW
  AUTO 3,1
				.LIST OFF
*--------------------------------------
IO.IIC.RDVBLMSK	.EQ $C041				R, B7=1: VBL interrupts enabled
*--------------------------------------
* The action taken for the soft switches 
* from $C058 ... $C05F is only taken if access 
* has first been enabled by writing to IOUDISOFF ($C07F).] 
*--------------------------------------
IO.IIC.DISVBL	.EQ $C05A				W, Disable VBL interrupts
IO.IIC.ENVBL	.EQ $C05B				W, Enable VBL interrupts
IO.IIC.CLRVBLIRQ .EQ $C070				R, Clear the VBL interrupt condition 
*--------------------------------------
MAN
SAVE INC/IO.IIC.I