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C > COMMODORE  > PET 30xx     


Commodore
PET 30xx

The CBM 3xxx and 4xxx series were revisions of the original PET 2001.
The range was rebranded CBM (Commodore Business Machine), as PET was dropped.

The 3xxx series introduced the 3000 series ROM sets, BASIC v3, and a completely redesigned keyboard layout, which used a full typewriter keyboard instead of the "mickey mouse" keyboard of the PET, and dropped the on-board cassette unit.

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Well, at least you know the video circuits are working. Looks like the CPU isn't resetting right and isn't executing its code in ROM and fails to clear its video RAM. I had same problem with old Apple 2. It's probably just some corrosion build up on chip leads or sockets. Cleaning up the contacts with a soft pencil eraser and/or reseating the chips will be enough to restart your vintage computer.
Hope that helps.

          
Monday 8th May 2006
Yves McDonald (the North, Quebec, Canada)

When I switch my PET on the screen is full of rubbish. It used to work fine sometimes but not now. Can it be fixed?

          
Friday 6th February 2004
A Hodson (England)

 

NAME  PET 30xx
MANUFACTURER  Commodore
TYPE  Professional Computer
ORIGIN  U.S.A.
YEAR  1979
BUILT IN LANGUAGE  Commodore Basic
KEYBOARD  QWERTY full-stroke keyboard, and sometimes calculator type
CPU  6502
SPEED  1 mHz
RAM  8, 16 or 32 k
ROM  14 k
TEXT MODES  40 x 25
GRAPHIC MODES  None
COLOrsc  monochrom
SIZE / WEIGHT  Heavy !
I/O PORTS  IEEE 488, Tape (2)
POWER SUPPLY  Built-in PSU





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