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How to instruction for replacing 4116 Dram chips with 4164 chips and eliminating the unreliable voltage generator circuit. in an issue 1 ram pack and replace the annoying ribbon cable with pin/socket strip.

How to instruction for replacing 4116 Dram chips with 4164 chips and eliminating the unreliable voltage generator circuit. in an issue 3 ram pack.

PCB to provide power supply for peripheral without connecting to ZX81. Mainly used to check RamPack voltages.