Annotated 4K ROM Listing – Systems Variables Authors Publication Syntax Publication Details Volume: 2 Issue: 10 Date October 1981 Pages 6-7 Read the article See all articles from Syntax/Syntax ZX80 v2 n10 Listing tells you the values of all major variables used in the 4K ROM. Products Downloadable Media Related Articles Tags Syntax, 1981, Reference, ZX80 People No people associated with this content.