>From: "Dave Dunfield" <dave04a_at_dunfield.com>
>
---snip---
>
>Any further ideas?
Hi Dave
It still sounds like a RAM related issue. The 6502's
needed to gate the VMA with Phase2 ( as I recall ) to
get clean address selects. You might put a scope on
this circuit and make sure it looks like it is working
well.
You should try to create a more exhaustive RAM test.
Although, time consuming, GALPAT is just about the
most intensive.
Dwight
>
>Regards,
>Dave
>--
>dave04a (at) Dave Dunfield
>dunfield (dot) Firmware development services & tools: www.dunfield.com
>com Vintage computing equipment collector.
> http://www.parse.com/~ddunfield/museum/index.html
>
>
>
Received on Fri Aug 13 2004 - 13:27:38 BST