Re: More CPLD explorations

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Tue, 25 Feb 2014 19:07:07 +0100 Message-ID: <530CDBCB.6060200@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 02/25/2014 06:43 PM, silverdr@wfmh.org.pl wrote:
>
> For now I’d be more concerned with the full compatibility of the original setup. I tested (and use) the “realPLA” by skoe (yeah - the same one) but I don’t have the KU board (which is said to be most picky about what controls its chips) to test with.

Can't speak about the KU, but I have two 250407 that will not play 'Edge 
of Disgrace' with a SuperPLA. It will always hang at a certain part of 
the demo. Use an original PLA and they work fine.

On the other hand, the same SuperPLA works flawlessly in a 250466...

On thing about the KU are the rather narrow traces. They didn't use 
planes or wide traces for the +5V and GND.

If you feel adventurous, use your Oscilloscope to visualize what happens 
on a C64 board with GND. Hook up the GND part of the probe to GND at the 
power supply intput and the other part to GND at the keyboard connector. 
On a KU you will see peaks of up to 1V (peak to peak).

  Gerrit

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