23 Dec
2007
23 Dec
'07
9:08 a.m.
From: cc at corti-net.de
On Fri, 21 Dec 2007, Jos Dreesen / Marian Capel wrote:
Hi
It could also be a problem in the address decoder. I've also seen
interaction with another RAM on the same line as causing such
problems as well.
In the case of another RAM, it is ususally the previous RAM
accessed. It tends to stay selected a little longer than it should.
My bet is on the address decoder not selecting that RAM.
Dwight
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The machine functions, but the defective IC shows
up as a white stripe on the
display since it is part of the video frame buffer. Changing the IC did not
help, of course also the 4116 replacement I used could have been defective.
What about a broken copper trace, defective data or address buffer/driver
or mux/demux? I had a similar fault on the graphics adapter in the IBM
5110, one bit of a multiplexer was bad.
Christian