| 24 Line I/O |
The circuit given on the following page is for an add-on board that will plug into the ZX81’s rear connector and provide 24 bi-directional Input/Output lines. These could be used to control music synthesisers, model train layouts, or whatever you wish. Because the ZX81 has 1K resistors in series with the data lines DØ-D7, which |
Timex/Sinclair 1000 |
| Bits and Bytes |
178 – Many magazines carry ads for clear plastic covers for IBM type keyboards to protect them from spills and greasy fingers. The TS2068 and TS 1500 keyboards can be given much the same type of protection by laying a piece of plastic wrap such as Saran over them. The keyboard “feel” is preserved too. |
Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Editor's Notes |
One of our advertisers is missing. Indeed another of the Sinclair family of product sellers has gone. Some will have noticed that the advertisement for T&C Services was not in the last issue of QZX. That business has disappeared into the woodwork. The telephone number which has graced the pages for more issues than I |
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