A Z80 machine language program to use the ZX81 as an audio frequency counter Authors Carol F. Milazzo Publication QZX Publication Details Volume: 2 Issue: 11 Date October 1984 Pages See all articles from QZX v2 n11 Products Downloadable Media Related Articles Tags QZX, Machine language programming, TS 1000, Type-in program, ZX81 People Carol F. Milazzo
