Quote:
Originally Posted by Slothie
The address latch doesnt need to be transparent as the data bus is stable on the rising edge of NADS so you can use a 74x173 which is positive edge triggered latch without needing to invert it. Using a multiplexer as a latch is not reliable according to some people as was discussed in the early parts of the mk14 schematics thread.
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I started with 74hct173, then decided to switch to the 74hct257 as a transparent latch instead. I was thinking about extending the time for stable address set up, but then realised the timing of the scmp bus is so slow that it really doesn’t matter, but then I was just amused to misuse the multiplexer. I’ll take a look through those early mk14 posts.
Anyway sorry to divert the topic of this thread.