Re: pet 2001

From: Larry Anderson (
Date: 2000-07-20 03:57:16

Another thought is that one of your ROMs have slipped out of their

 Open the case of the PET (there are screws under the front holding it
closed, lift the lid and you will find a metal prop-rod to prop the case open...)

 With the computer off (but plugged in so you can ground yourself with
the outer metal case) locate the chips that have sockets, if it has been
a while some chips may be partially out of their sockets.

Re-seat the loose chips, making sure to not bend any pins that may have
been sticking out.

Push down (not too hard) on each of the other socketed chips to push
them better in their sockets.

Now try the power again.  Mnay of my PETs get this way (starting to the
monitor) when the chips start getting loose.  If it still gives you the
MLM, then it probably is some hardware fault of some kind, and best
diagnosed by someone with more electonic skills than I.

> On Tue, 18 Jul 2000 wrote:
> > i'm trying to get basic when i turn the thing on, but it goes to 'sys' mode.
> > can you help?
> > thanks- stefan
> Do you mean the machine language monitor (the thing that lists the
> register contents)?  It could be that one of the RAM chips is faulty,
> causing the boot-up procedure to crash.  A copy of this message goes to
> the cbm-hackers mailing list, whose subscribers could have more ideas.
>         Marko

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   Larry Anderson - Sysop of Silicon Realms BBS  (209) 754-1363 
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