2K to 4K RAM Upgrade – An Introduction to ZX/TS Hardware Authors Randall Glidden Publication SYNC Publication Details Volume: 3 Issue: 4 Date July/August 1983 Pages 56-64 Read the article See all articles from SYNC v3 n4 Products Downloadable Media Related Articles Tags SYNC, 1983, Hardware project, TS 1000, ZX81 People Randall Glidden