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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

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Old 17th Jul 2018, 4:52 am   #41
TonyDuell
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Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 2,433
Default Re: Tesla MH74S571 programming.

Quote:
Originally Posted by SiriusHardware View Post
I think SOC did offer sets of switches as an option for fitting in place of the dome contact keypad but if they did I do not believe they were already legended - the reason I say that is that I have seen a number of images of late issue MK14s with switch sets fitted, but none of them have ever been professionally legended. Of course the owners in the cases mentioned may just have chosen to source their own switches if they found they could do so more cheaply.
I never saw any adverts. etc for an official kit of switches (and coincidentally, I was tidying up some MK14-related paperwork yesterday). But the late version PCBs could take a keyboard switch that Maplin sold (I think they called it a 'clickswitch') and of course that was mentioned in magazines at the time. Many MK14 owners fitted 20 of those with white caps for the digits and some other colour caps for GO/MEM/ABORT/TERM (where did those names come from??). Obviously you then had to label them with Letraset or similar.
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