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VIC-20 HYPER EXPANDER Memory Expander & Software / Diagnostics vic20_hyperexpander

$59.00 each

OVERVIEW

The PCB is populated with a W27C512 EPROM programmed with the "Hyper_Expander_Firmware_Set1"

The W27C512 is electrically erasable so can be reprogrammed using a suitable programmer (Not supplied) to program your own images.

Included on the EPROM: (See photos for screenshots of the software included on the ROM)

The ROM's (And RAM configuration) are selected using the DIP Switches.

Switch	Chip Select	RAM Address	Note
1	/BLK1	$2000 - $3FFF	First 8k Expansion, BASIC RAM
2	/BLK2	$4000 - $5FFF	Second 8k Expansion, BASIC RAM
3	/BLK3	$6000 - $7FFF	Third 8k Expansion, BASIC RAM
4	3kB	$0400 - $0FFF	BASIC RAM (without any 8k Expansions)
5	/BLK5	$A000 - $BFFF	8kB, no BASIC RAM, machine language only
6	/IO2	$9800 - $9BFF	1kB, no BASIC RAM, machine language only
7	/IO3	$9C00 - $9FFF	1kB, no BASIC RAM, machine language only

1 /BLK1	2 /BLK2	3 /BLK3	4 3kB	5 /BLK5	6 /IO2	7 /IO3	8 J2	BASIC BYTES FREE/ Expansion Size
OFF	X	X	ON	X	X	X	I	6655 / 3kB
ON	OFF	X	X	X	X	X	I	11775 / 8kB
ON	ON	OFF	X	X	X	X	I	19967 / 16kB
ON	ON	ON	X	X	X	X	I	28159 / 24kB
ON	ON	ON	ON	ON	ON	ON	I	28159 / 37kB (24k for BASIC)