20 May
2008
20 May
'08
12:38 p.m.
Hi again folks,
Well, following my struggles to discover what's wrong with Ozzie, I booted
today & discovered that, whilst the machine is drawing stuff on the screen,
it's nearly readable. After much trial & error, I further discovered (on a
2nd disk) a program called memtest.
Running this has revealed a bad block of memory, between 4081 and 64C1
(always a variation on xx81 and xxC1). Interestingly, the screen is
remarkably stable while this test is running.
Now... the RAM is physically arranged as a 4x8 array (according to the tech
manual); so how can I tell which chip is supposed to look after addresses
4081 through to 64C1?
I am now assuming that this bad chip is, somehow, interfering with the video
latch/counter, hence the crazy video.
Any more ideas? All gratefully received.
Cheers!
Ade.
No virus found in this outgoing message.
Checked by AVG.
Version: 7.5.524 / Virus Database: 269.23.21/1455 - Release Date: 19/05/2008
17:04