From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2004-11-19 14:27:35
On Wed, Nov 17, 2004 at 08:40:10PM -0500, William Levak wrote: > Did you measure the voltage on the CASS SENSE line? A logic probe would > be ideal. It is normally at +5V, and is pulled low when the play switch > is depressed. It was about 1.1 volts. After I disconnected pin 26 of the processor from the CASS SENSE line, it was much higher (I don't remember how much, but I think it was well over 3 volts.) > If your 8502 is socketed you can test it by pulling it up and bending out > pin 26. If the problem persists, the 8502 is definitely bad. The disconnected pin 26 was at -.462 volts. I first misread it as -4.62 and wondered if I had flipped the polarity. So, it looks like the 8502 is broken. :-( Marko Message was sent through the cbm-hackers mailing list
Archive generated by hypermail pre-2.1.8.