Normally at this boards the half of the 6550 and some 6540's are dead... Often the 6520 are faulty too. The sockets are a very big problem. Commodore used in the old 2001 the high black sockets with metal outside - these are very bad! Also they have not so high sockets with metal contacts inside - these are much better. And they used TI-sockets with very thin holes - these are the best!. I have a rom-replacement board that fits in H2 to H5 as 6540 replacement. And I test the RAMs and ROMs with my 2001TEST in H7 (with adapter 27xxx to 6540). You find it here: http://lc64.blogspot.de/2016/10/ Poking and peeking to $8200 worked, but on the screen is still a wrong char. That was because the screen-display-counter D7 74177 has probs with the jump to the highest bit. -- Sent from: http://cbm-hackers.2304266.n4.nabble.com/ Message was sent through the cbm-hackers mailing listReceived on 2017-12-27 20:00:03
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