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Old 29th Nov 2022, 9:22 am   #20
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,482
Default Re: Tesla Programmer

I happen to have an 8255 or three, but all of the above is convincing me that I should probably go directly to / from the programmer's control hardware and 4-bit data buses and miss out the 8255.

Chris's design seems to have stayed (as far as possible) quite close to that of the original DM74S571 programmer, for example in its use of BFY50 medium power transistors - the design of that programmer has been messed with as little as possible to achieve an MH74S571 programmer which still looks appropriately retro.

In practice, it may be easier to find some T0126 medium power NPN transistors which will work just as well.

I did have a tube of around 10 74C906 somewhere, of course I temporarily don't know where that is but now I have the incentive to find them...
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