Articles
| Title | Description | Computers |
|---|---|---|
| A Z80 machine language program to use the ZX81 as an audio frequency counter | Sinclair ZX81, Timex/Sinclair 1000 |
QZX v2 n11
| Title | Description | Computers |
|---|---|---|
| A Z80 machine language program to use the ZX81 as an audio frequency counter | Sinclair ZX81, Timex/Sinclair 1000 |