On 11/17/2020 6:58 PM, Terry Raymond wrote: > > > Okay there is the C64/C128 Commdore service manual does that actually > show the Low/High states of Logic chips and MOS chips hopefully to see > if the chip is good or smoked? Most often not. You'd need to get a copy fo teh IC datasheet online and probe each input and then each output, determining if the IC is working based on teh truth table in the datasheet. > > maybe this is crazy but I dont know anything about logic probes, could > I power this somehow from the MB itself or use some other more > reliable power. You can. Or a battery. 3 AA cells should work > Oh yeah I do remember the Led lights have something to do with the > high or low states am I correct? That I am not sure. I don't own one. > > The other problem is I dont have an Oscilliscope mainly for checking > for the > correct signal on the processor chips, yeah I know theres the 8502 and the > Z80 on the c128 so Im stuck with using a logic probe and a Voltage > meter, but if reading a chip with a voltage meter should that be set > at OHMS to read resistance? No, an ohmmeeter won't be much good in either setting for a logic IC. JimReceived on 2020-11-18 03:00:46
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