ZX81 Ram Pack Issue 1 4164 Update

ZX81 Ram Pack Issue 1 4164 Update

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.

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ZX81 Ram Pack Issue 3 4164 update

ZX81 Ram Pack Issue 3 4164 update

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

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