KAT Keyboard Audio Tone
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TV Services of Cambridge
MIA Missing in action. This is known to have existed, and no copy has ever been found. If you own one, the archives would like to hear from you.
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In the magazines 1
Sinclair User #4Jul 1982 · p.48
TV SERVICES BLEEPER TV Services of Cambridge has a neat little keyboard bleeper called the KAT keyboard audio tone. The device can be fitted inside the case in the space beneath the keyboard, or in any other place for that matter, as it is an extremely flat PCB and piezo-electric loudspeaker. There are only five soldering connections to make to the ZX-81 PCB, as the rest is ready-assembled. If that makes you nervous, the company will fit it to your ZX-81. The bleeper gives two tones, one when a key is pressed and one when the computer answers; it also signals the start and finish of a LOADing or SAVEing program. It may also be programmed to bleep in a program - for simulating an explosion - by using a PAUSE greater than 5. The KAT costs £8.95 if you fit it yourself and £10.95 if you send your ZX-81 for it to be fitted. TV Services of Cambridge Ltd, [redacted].
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