Facts

Facts


Facts

  • Manufacturer: Commodore
  • Released: 1979
  • RAM: 32 KB (Model 3008 had 8 KB and 3016 had 16 KB)
  • ROM: 20 KB
  • CPU: 6502 @ ~1 MHz
  • Text mode: 40 x 25 monochrome (PETSCII)
  • Graphics: none
  • Sound: none
  • Ports: 2 MOS 6520 PIA, MOS 6522 VIA, 2x Datassette (1 internal), 1x IEEE-488
  • OS: Basic 2.0 (similar to the later Commodore 64)
  • External storage: datasette tape, 5.25" floppy, 8" floppy, hard drive
  • Predecessor: PET 2001
  • Successor: CBM/PET 4000-series and 8000-series
  • Family: CBM 3000-series (PET 2001-N series)

Released 1979: This is a computer that looks like a computer. In 1979, Commodore replaced the original PET 2001 with an improved model known as the 2001-N (the N was short for “New”). Encouraged by brisk US and Canada sales, Commodore introduced the PET-series computers to the European market. A Dutch company called Philips was producing a 96 KB RAM system called the “Programm-Entwicklungs-Terminal”, and had rights to the acronym “PET”. Commodore soon removed the “PET” name from their 2001-N series computers, and relabeled them in Europe as the “CBM 3000-series). All of the machines in this series feature a 9” green phosphorous screen and a full graphic keyboard (PETSCII character set was later used in Commodore 64). A fully programmable bi-directional parallel “user” port is used to control a myriad of home project hardware.

My CBM 3032, service and upgrades: I bought mine from Germany, it was fully working, luckily. It came with no storage media, but its got the same cassette/datasette port that came with the later VIC-20, C64 and others. I downloaded a BASIC language program for the CBM/PET using my modern PC and transferred it to my C64 which I got a SD-card reader for. I saved the program on tape using my C64. Then I connected the “C2N” recorder to the CBM computer and loaded the program.

It would not run however, the PET/CBM start address for BASIC programs are different from the C64. The “RUN” command starts the BASIC program in memory from a certain address. The BASIC 2.0 on the CBM/PET also got a simple “Machine Code Monitor” where you can alter the memory and type in Assembler language. To enter it, you just type in SYS 1024 (an unused memory address).  Then I managed to move the BASIC program to the correct start address for the CBM/PET, and then save the program onto the tape once more. This time the program would run.

I bought a floppy/harddrive emulator called petSD+ (www.primrosebank.net). It uses SD-memory cards for storage, it makes it very easy to transfer software from a PC.  I had to buy a IEEE-488 cable for it and an adapter for connecting it to the “non-standard” pin-out IEEE connector on the computer. I also got a box to protect it, only had to cut out holes for the connectors and buttons.

Next, due to its age, I brought the computer to a specialist (www.retroservice.no) that replaced all the capacitors for me, including for the circuit in the monitor. Electrolytic capacitors looses their attributes with age, the liquid electrolyte dries in. Eventually they explodes or just silently leak electrolyte onto the mainboard, and potentially makes shortcuts and causes all sorts of problems.

The CBM 3032 has no built in sound, but its very easy to make a small beeper/piezo connected to the user port “CB2”. Some games supports it and will give you sound. You only need the connector, a resistor and a very small speaker/amplifier, I powered it from the cassette port.

CBM 3032

Remi Jakobsen


I'm collecting classic computers and video games, stretching from the 70's into the 90's. Restoration, history, usage ...


Post navigation


Leave a Reply

Your email address will not be published. Required fields are marked *