The traditional type of 64k expansion board for the VDC simply disconnects the two 16k x 4 DRAM chips from the mainboard and offers a pair of sockets for two 64k x 4 DRAM chips.
Francis's new type is much smaller, consumes much less power and uses a single static RAM chip.
Advanced skills in electronics and solder and desolder techniques required - Please check images and instructions listed for further information.
