ZX81 Programs

Electronic spreadsheet program. Enter data or formulas in a row and column format. Formulas include all numeric functions plus special ones for adding up a series of numbers or for looking up tables. 16K.

Machine language program that sorts up to 255 floating point numbers stored in a Basic array in 4 seconds. A comparable Basic program takes over 16 minutes in the FAST mode. 16K.

Written in Basic for easy modification.