ZX81 Calculator Authors Alex Burr Publication Syntax Pub Details Volume: 3 Issue: 12 Date December 1982 Pages 18 Read the article See all articles from Syntax/Syntax ZX80 v3 n12 Use the Sinclair’s expression evaluator to make a calculator. Products Downloadable Media Related Articles Tags Syntax, 1982, TS 1000, Type-in program, ZX81 People Alex Burr