Re: A couple of PET drive problems...

From: Bryan Pope (
Date: 2007-03-19 20:54:30

And thusly were the wise words spake by =?iso-8859-1?Q?=22Andr=E9_Fachat=22?=
> > 2. With a 2031, it powers up correctly but whenever you try to do any 
> > disk access like get a directory or header a disk, the computer hangs 
> > until I power off the 2031.  I have already swapped the ROMs and the 
> > 6522, but the problem still persists.  I haven't swapped the 
> > 75160 and/or 75161 yet.  Could one of these be the problem and if 
> > so which one should I swap first?  I am trying to minimize any 
> > desoldering/soldering...
> IIRC the 75161 is the control lines driver (ATN, NDAC, ...). This
> would be the one that would cause a hang. However, I'd rather
> measure the input/output signals to check what's wrong before
> unsoldering any other ICs.

Is there a webpage that describes how to measure the I/O signals?
Do I need to use an oscilloscope or will a multimeter do?  Do I 
need some sort of breakout box?



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