A500 Boot Problem

[Damion]

BGary335 wrote:
I have not swapped those. Right now I don't have any other CIA chips to swap them with.

BGary, just try swapping one with the other (they're both the same), and see if there's any difference at all. That way you'll at least know whether or not you're on the right track.

 

[Damion]

Sounds like we're definitely on the right track. If both CIA's were functioning, there wouldn't be any change (unless they happened to be seated improperly, but you checked that).

You can buy these from Softhut. If you're lucky, you might find a complete 500 at a local thrift store (Salvation Army can be a good spot) for even less.

[Damion]

Found some links that might be of some help:

Startup error diagnostics

Schematics and service manuals, "tech topics"

[url=http://theweeks.org/toms-stuff/AMYHACKPAGE.html#TDTTT] Links page, may be some useful info here


And I hate to ask the obvious, but have you taken a very close, thorough look at the board, to check for anything that looks like it may have gotten hot? Or maybe a previous   repair/upgrade gone wrong... (f.e, A500 motherboards required different modifications when upgrading to the 1 MB Agnus (popular), maybe a bad solder joint or someting around JP2? I had one of these once... drove me nuts!)


Regards,


Damion