Re: Commodore PLA equations (complete)

> btw, at the end, isnt it all NANDs ? or NORs ?

How exactly it's done in the 82S100 is written in its datasheet: It has
(up to) 48 product terms which are AND combinations of any of the
inputs and inverted inputs.

Any of these 48 product terms can be combined to 8 sums, which are OR
combinations of the product terms.

The final result can be inverted (which is done with the CASRAM output
obviously, which re-uses most of the terms of the other outputs).

For my PLA clone (which should arrive in the next few days from
Donald...) I wrote the terms in exactly this form. Which makes no
difference as the CPLD synthesizer/fitter optimizes it anyway, even if
it is written in other forms - but it feels more original ;)

Skoe


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