Re: Fatal problem with Apple II?

[Rubywand <rubywand@swbell.net>]

"Dr. Forbin" writes ...
> 
> John Robertson wrote:
> 
> > Chances are the disk controller card was damaged by this insertion
> > with the power on. Have you tried a second controller?
> 
> I tried the controller from my Unitron and got similar results.  Since
> the problem apparently extends to keyboard signals, I'm thinking the
> unit's more or less done for.  :(

     Could be. On the other hand, you may just need to replace a few IC's. The
ones most likely to get zapped are the 74LS138's which handle Slot, I/O, and
Device select (ICs F12, H12, and H2 on a II+ diagram) and a 74LS257 which takes
care of routing Data lines (IC B6 on a II+ diagram).  If the 74LS257 at B6 is
messed up, it could directly affect KB inputs.



Rubywand