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C > COMMODORE  > PET / CBM 40xx   


Commodore
PET / CBM 40xx

These computers are new versions of the PET series. The main improvement was the new ROM version (v4.0) which offered new possibilities such as direct disk operation commands (DLOAD, DSAVE, COPY, HEADER, etc.) or the ability to repeat cursor control characters by holding down keys. Late models also had a larger screen (12'') than the 2001 computers.

The disk drives were "Intelligent", which means that they were CPU driven (MOS 6502) and had internal RAM (4 KB) & ROM (16KB, which contained the DOS).

The 4032 and the 4016 were sold with an 80-column dot matrix printer (5x8 character matrix). This printer (4022) was an Epson printer with a Commodore name on it.

Dave Ridley reports:
CBM & PET 4000/8000 series - Brings back the memories! I used to fix these things, and boy did they have some classics. Regular problems were caused by the chip sockets going intermittant together with the molex power connectors burning out! Fix - remove chip squirt with RS Solvent Cleaner and stick them back. The external Disk units were connected by IEEE connectors. These disk drive units would fail, many a time I would open a unit up onsite(rather like opening the bonnet of a car) to find a pair of rectifier diodes that had got so hot they had actually melted themselves out of the board and fallen into the base.

NAME  PET / CBM 40xx
MANUFACTURER  Commodore
TYPE  Home Computer
ORIGIN  U.S.A.
YEAR  1980
BUILT IN LANGUAGE  Commodore Basic 4.0
KEYBOARD  QWERTY full-stroke keyboard
CPU  6502
SPEED  1 MHz
RAM  16 or 32 KB
ROM  20 KB
TEXT MODES  40 columns x 25 lines, upgradable to 80 columns
GRAPHIC MODES  None
COLORS  Monochrome
SOUND  Programmable piezo buzzer
SIZE / WEIGHT  Pet 4032 : 9'' x 17'' x 17'' / 45 lbs
I/O PORTS  IEEE 488, I/O ports (8), Tape (2)
POWER SUPPLY  Built-in PSU
PRICE  £775 (UK, 1984)


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