HALP: My PET 2001 seems to have gone bad in storage, what do

[Luzur]

Bought a PET some...2 years ago, and it worked fine then when i got it and then i put it in storage (indoors in dry and warm temps) and yesterday i suddenly got aurge to take it out and load a PET game i found on a tape, but to my horror all i got when i started it was this:

http://i.imgur.com/JwgosRD.jpg

Faulty chip or something else?

pl0x HAPL MEH
_________

 

[SkydivinGirl]

That was fast. I hope someone is able to help.

Heather

 

[Luzur]

Man you get around, miss :D

 

[KC9UDX]

Yep, faulty chip or something else.

Most likely bad SRAM. But, it could be the CPU, the 555, or something else.

Leave it turned on for a while and it might come to life on its own, maybe.

 

[Luzur]

Let it warm up you mean? Hmm, makes sense.

Ok, i'll try it tomorrow.

 

[KC9UDX]

Sort of. Some SRAM chips come back to life on their own.

If I leave my 2001N off for too long, the first time I turn it on, I get this:

Then, I leave it on for a while, and reset, and get this:

So, I leave it on for a while, and reset, and get this:

One more time, and this:


It happens all the time. But, my SRAMs were all replaced a year ago. Yours might be original, and might not recover.

 

[MikeS]

First thing I'd try is to move all the socketed chips back and forth in their sockets; those sockets are notoriously flaky.

Next you'll probably have some intermittent keys...

 

[RizThomas]

Sounds like the same experience I went through with my PET 2001-8. I have whole thread here in what I ended up doing to solve my problem.
I started here......
1.

http://www.8bit-homecomputermuseum.at/repair/bluepet/bluepet.html

2. A lot of help from MikeS, Eudi, Gubbish, Donni to name a few.

I also had fun building / get / buy to have the final solution.
A). PETTester (thanks to Eudi for an optimized eprom program )
B). Set of Donni's ROM/RAM boards (thanks to Thomas)
C). PETVET from Gubbish (bitfixer)
And a set of CURSORs PET program files from MikeS to use with my PETDisk.

Hopefully just reseating the SRAMs ( or ROMs) will solve your problem but if you ended up like me ( my PET had a Skyle's ROM sets which tested bad) ... can no longer replace with original ROM set, had to use Donni's. I eventually opted to use PETVet in the end.

RizThomas

 

[Luzur]

First thing I'd try is to move all the socketed chips back and forth in their sockets; those sockets are notoriously flaky.

Next you'll probably have some intermittent keys...

As is pulling them out completely or just "shake" them? i have pushed all of them and a few made a little click noise.