ZX81 Part 2 – Upgrading the on board memory from 1K to 16K

ZX81 Repair and upgrade Part 2 – Upgrading the on board memory from 1K to 16K 00:00 Introduction 02:13 removing the old chip 04:22 Repairing a faulty circuit board trace 08:48 Installing the wrong chip socket 18:15 This is where I realise my mistake 19:40 Replacing the wrong socket with the correct one 24:50 Bending the chip pins for the correct connections 29:00 Testing and photos 4-part trilogy* upgrading and repairing a ZX81 Part 1 – Replacing the TV modulator Part 2 – Upgrading the on board memory from 1K to 16K Part 3 – Replacing the faulty keyboard Part 4 – Recapping and voltage regulator EBay TV Composite Video (TV Modulator) https://ebay.us/nJB9rY EBay Replacement 16k RAM Chip https://ebay.us/IPAQIy EBay Replacement Keyboard https://ebay.us/bZXQ1m ZX-81 Components https://www.retroleum.co.uk/sinclair-... You can find an excellent ZX81 emulator here http://www.zx81stuff.org.uk/zx81/jtyo... You can see early PCs at these two computer museums: Bletchley Park: https://www.tnmoc.org/ Cambridge: http://www.computinghistory.org.uk/ *A trilogy in four parts. https://en.wikipedia.org/wiki/The_Hit...