Function Name: IOBASE

Purpose: Read base address of I/O block
Call address: $FFF3 (hex) 65523 (decimal)
Preparation:

	Registers:	none
	Memory:		system map
	Flags:		none
	Calls:		none

	Registers:	.X = lsb of I/O block
			.Y = msb of I/O block
	Memory:		none
	Flags:		none

Description: IOBASE is not used in the C128 but is included for compatibility and completeness. It returns the address of the I/O block in .X and .Y.

EXAMPLE:

	JSR	$FFF3	;find the I/O block