In this kit I build a 4116 / 4164 DRAM testing kit, suitable for ZX Spectrums Lower and Upper RAM tests, Commodore 64 plus many more retro computers.

I bought this kit from eBay - [ Ссылка ]
but plenty of retro Computing shops now stock these kits. I hope this video helps you, I will find this kit very useful whilst i restore a stack of ZX Spectrum 48K models.

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