Dunno... discovering the intricate details of what exactly makes a PLA sub work ok on all versions of the C64 has been a frustrating but truly fantastic adventure.Oge_user wrote: ↑Sun Jun 25, 2017 4:19 pmI completely agree. PLAnkton just does its job good and costs even less than an used Commodore PLA, which goes for insane price when bought from eBay and - when not bought in New Old Stock condition - cannot be expected to work for long periods of time.
Finding a New Old Stock PLA was something possible some years ago, now it is rare enough that - from my point of view - if you are lucky enough to find one from a ol' man electronic store, then reselling would be an unwise move. I would personally keep the mint PLAs for future preservation and just use a PLAnkton.
Jim Drew dared me so I had to get it done and with the help of the posted information of Thomas 'Skoe' Giesel it became a sort of quest that had to be accomplished.
To top it off, Groepaz trolled me for years on various forums about my PROM based solution causing problems which it never did. To add insult to injury, Tynemouth software openly announces exactly how to make such a PROM based solution which does cause the aforementioned problems but of course he and his friends are completely silent about it.
I knew the secret that was missing was in analog details you can't find in the logic equations and Jens Schönfeld had the audacity to say I think too much in analog terms... duh!
PLAnkton is the first PLA substitute to provide everything a C64 needs to work exactly like it has a real PLA. Sure you can have better delays here and there. Sure you can have pin 1 and 19 which are not even used. You can also have a more accurate voltage while genuine Commodore PLAs give you something between 2.5 and 4.4 volts... in the end what matters is you get something that's within functioning tolerances.