At 08:17 pm 19/08/2001 -0500, Raymond C. Bryan wrote: >A couple things if you have a volt meter test the power supplie >voltages then see that the cpu has a "clock" pulse (on the 6502 is >that on pin2 like the 6510?, look this up) a voltmeter should show >about 2.5 volts on the clock pin (50% duty cycle of 5 V). Good idea. I'm getting 2.1v from CLK0 (pin 37), 0.95v from CLK2 (pin 39) and 0.75v from CLK1 (pin 3). > >Next if you have a working 8032 putting a dead chip in that will not >fry the working unit, but that will tell you that have a working or >dead chip (cpu, rom,via). Second the RAM is also a possible problem >- but probably not socketed. Or you could have faulty logic ics >74lsxx again not socketed. I shall try the 6502 in my working machine (I've not checked that yet), but I'm starting to suspect the CRT controller, as it's the warmest chip of them all after a few minutes powered up. Cheers! Ade. -- B-Racing: B where it's at :-) http://www.b-racing.co.uk Message was sent through the cbm-hackers mailing list
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