AMD9016E speed / lilith memory

[dwight elvey]

> From: cc at corti-net.de
>
> On Fri, 21 Dec 2007, Jos Dreesen / Marian Capel wrote:
>> 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

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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