6 Mar
2013
6 Mar
'13
8:14 p.m.
On Mar 6, 2013, at 10:58 PM, Jim Brain wrote:
On 3/6/2013 5:11 PM, David Riley wrote:
What do you need? I'm
sure we can help.
Wish I knew! All I have is a black screen and with an IRQ line
continuously asserted. If I pull the VIC, it is no longer
asserted, but I'm not enough of a fool to assume that correlation
equals causation here. Common wisdom says it's probably the PLA,
but I haven't been able to find any indication of trouble
indicators on the PLA I can probe with the scope.
So, some donor machine that's mostly-whole would probably be a
good start. If anyone can point me to the sort of C64 repair
guide that details what I should see on a scope for good or bad
parts, that would be an even better start, since I despise
scattershot part-swapping (especially when I have to desolder
things to do it). My own intuition hasn't quite gotten me to
where I need to be here.
- Dave
I dunno,
man. People can't give them away here in western
Pennsylvania. (nor could they in southwest Florida)
On that note, if anyone's
looking to part with a parts donor machine,
I'll gladly pay shipping plus a nominal fee. :-)