Polymorhic 8810

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Tue Aug 31 17:23:01 2004

>From: "Barry Watzman" <Watzman_at_neo.rr.com>
>
>I'd say that it's not working. The random display does suggest that a lot
>of the video card is functional. However, it also suggests that the ROM
>monitor on the CPU card isn't being run, which would clear the screen. This
>could suggest bad memory or CPU or both, but in any case I'd say that,
>contrary to what the seller says, the system is not functioning properly.
>
>
>
>

Hi
 I'd tend to agree with Barry. I have 2 Poly88's and one 8813.
This is an indication that the system is not running. The video
memory quite commonly has failures but this usually shows up
as a chunk of the video not responding correctly. The video
uses 2111 chips ( often 9111 populated ). I am seeing some
quadrant like behavior so it might just be a lot of bad video
RAM. If anyone gets this that is on the list, I can help
them bring it back to life. Finding some of the RAM chips
that work may be an issue. I went through a pile of these that
Achor Electronics had and found only one in three that was
any good.
 The fact that the disk seeks is a good indication though.
If it is in fact doing this, the ROM's must be doing something.
Dwight
Received on Tue Aug 31 2004 - 17:23:01 BST