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This mini forum is intended to provide a simple means of discussion about the Commodore  PET / CBM 40xx computer. If you want to share your own experience or memories, or add relevant information about this system: post a message!

  Click Here to add a message in the forum


Wednesday 12th August 2020
bacon man (USA)

to browse this website

Saturday 2nd February 2019
Loren (Spain)
Commodore PET Mini

Hi! I created a DIY 3D Printing project to build your own fully working Commodore PET Mini, just like this one! Take a look at it here:

Thursday 30th October 2014
zozo (france)

I found one on the side of the road one day it worked why throw such a computer ? ... I threw my turn lol a moment of madness I think!

Monday 18th January 2010
Craig Carr (USA)

Sometime between 1979 and 1981 I remember going to the library in our High School and a group of us would check out the cassette tapes required to load programs onto the PET. We also created several of our own games which we had to store on cassette tape. I think I still have one of those tapes around. The funnest game we made was a spaceship game that was better than asteroids. I was also taking fortran as a class on a Burroughs mainframe using Punch cards at the time.

Monday 13rd April 2009

We had a 4032 as our first home computer. My dad took us all on a 200 mile round trip to fetch it. It cost about a months salary for him. We ended up with a printer as well as I remember. It was eventually replaced with a Commodore 64 as soon as that was released.

Saturday 31st May 2008
Skel (Oakville, Ontario, Canada)

I remember back around 1991 or so (when I was still in high school) in Bedford, Nova Scotia, Canada, our school's only computer classroom had this model of PET computer sitting around.. lots of them in fact. The retired PETS rested under our desks where we'd kick them with our feet while we worked on Apple IIgs's above. All the PETS had sticky notes on their video monitors saying "I work" or "I'm broke". The only time we ever saw one of them ON TOP of the desk was the very first class when our computer teacher of the time, Mr. Lindsay, gave us a lecture on all the parts of a computer and how they work, why he used the PET for that lecture and not the Apple's I never figured out. In 2000 I took a tour of the school, and it now has several classrooms of computers sporting the latest model of PC. If only we knew how important the PET was to the microcomputer world we might have shown them some respect by not kicking them so hard... (BTW: None of the PETs ever broke from the kicks...)

Wednesday 19th July 2006
Neil Loughran (UK)

First computer I ever saw in 1981 or so... this was pure sex back then... hard to believe I know... ;-)Later, I remember converting Nightmare Park (classic PET game written in BASIC) from this to the Commodore 64 and it worked perfectly.. I think the POKES and PEEKS for the drawing of positions of characters were the only changes... never really knew why Commodore seemed to change all the memory maps on all their models.. would have made software a lot more portable. I felt so clever about the conversion (in 1982/83 or so)... until I got the &**^ kicked out of me for being a such a damn smartass.... ;-) Btw, the version of Space Invaders for the PET was awesome I remember.... pure machine code too...

Thursday 27th October 2005
Charles Steadman (New Zealand)

Still have a few of these... correction for the front page the screen wasn't "upgradeable" to 80 columns -- the 8032 was in many ways a completely different beastie. And wouldn't play most of the games, so who'd want one? :-)

Wednesday 30th March 2005
j4ck (us)

one of these was the first computer i ever touched... i remember hours of fighting to keep my place in line to play A.F.O. or Moon Patrol or Space Invaders

Friday 31st January 2003
Gert-Jan Vons (The Netherlands)

These CBM 40XXs where the computers we had in highschool (Utrecht, the Netherlands, around 1982-1983), the first ones I used that didn't require cards to program them. At the time, we had them networked with something we called "hydra" which was fun, and looking back, quite advanced too.
It not only allowed us to access the master system's floppy drive from any other station on the network, but we could actually view what was happening on the screen of another system in real time (!) or just completely mess them up :-)
Even today, I still remember the SYS 40960 and SYS 40963 commands we used to activate the network...

Monday 19th August 2002
Julian (Sydney, Australia)

A PET 4016 was my first computer, bought second hand when I was 13 years old (about 1983). It was fantastic. My grandfather built a sound module for it from a magazine article, it connected to the 'user port' at the back. We also had an aftermarket ROM chip called an 'Arrow' chip which added useful extra commands to the BASIC interpreter. When installing it, a leg broke off -- so we just soldered it back on! The other thing I remember about this computer is that the OS was from a small Palo Alto based company called Micro Soft. Anyone know what happened to them?

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