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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 13th May 2018, 9:48 pm   #61
Slothie
Triode
 
Join Date: Apr 2018
Location: Newbury, Berkshire, UK.
Posts: 43
Default Re: MK14 schematic revisions

Quote:
Originally Posted by SiriusHardware View Post
Quote:
Originally Posted by Slothie View Post
assuming a pair of the 74LS571's I have will work.
74LS157s?
Yes! I have proms on the brain
I'd love to know why some '157s work and others don't. I assume its due to the circuit relying on the propagation delays through the multiplexer. It's odd because they used a proper latch for the column decoder, I suppose the multiplexer was just cheaper!
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