PET startup sequence?? (was LF: Commodore PET schematics, troubleshooting info)

From: Dwight K. Elvey <>
Date: Fri Aug 13 13:27:38 2004

>From: "Dave Dunfield" <>
>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
 You should try to create a more exhaustive RAM test.
Although, time consuming, GALPAT is just about the
most intensive.

>dave04a (at) Dave Dunfield
>dunfield (dot) Firmware development services & tools:
>com Vintage computing equipment collector.
Received on Fri Aug 13 2004 - 13:27:38 BST

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