ZX81 repair and mods

Recently got a nonworking ZX81 personal computer. On power on only white and black vertical stripes were visible. Having some experience with ZX Spectrum`s my call was that RAM is faulty. ZX81 uses 2114 ram chips. I have ordered coupke of Toshiba TMM314AP 1024 word x 4-bit high speed read-write memories operated with 5 V […]