18 Aug
2009
18 Aug
'09
1:33 p.m.
I have a good DMM available, as well as a scope.
I just noticed that there are two chips missing, which appear to be ROMs.
There are sockets, but no chips. Their location would be toward the back
part of the board, to the right. They are the last two in a column (in
relation to the back) of similar-sized chips, most of which are direct
soldered to the board. I can take a photo if one is needed
On Tue, Aug 18, 2009 at 3:53 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
haha.
Its all back together. It still doesn't work. When I switch it on, all I
can
hear/feel is 60Hz in the area of the transformer.
I'd forget the CRT/monitor section for the moment, and try to get the
digital side working.
What test gear do you have?
I think you can fairly easily find schematics for the 8032. Start by
checking the power rail(s?) -- particularly that uyou have 5V to all the
logic chips. Make sure the master clock is running. Make sure the CPU is
doing something. Does it initialise the 6845 -- check the Vsync and Hsync
outputs of that chip to see if they are running at sane frequencies.
That should get you started...
-tony