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---
title: Commodore PET / CBM 40xx
categories:
- Computers
types:
- Home Computer
origins:
- U.S.A.
years:
- '1980'
cpus:
- '6502'
params:
name: PET / CBM 40xx
image: /media/museum/photos/commodore_pet4032_1.jpg
company: /companies/commodore
company_name: Commodore
specs:
- label: NAME
value: PET / CBM 40xx
- label: MANUFACTURER
value: Commodore
- label: TYPE
value: Home Computer
- label: ORIGIN
value: U.S.A.
- label: YEAR
value: '1980'
- label: BUILT IN LANGUAGE
value: Commodore Basic 4.0
- label: KEYBOARD
value: QWERTY full-stroke keyboard
- label: CPU
value: '6502'
- label: SPEED
value: 1 MHz
- label: RAM
value: 16 or 32 KB
- label: ROM
value: 20 KB
- label: TEXT MODES
value: 40 columns x 25 lines, upgradable to 80 columns
- label: GRAPHIC MODES
value: None
- label: COLORS
value: Monochrome
- label: SOUND
value: Programmable piezo buzzer
- label: SIZE / WEIGHT
value: 'Pet 4032 : 9'''' x 17'''' x 17'''' / 45 lbs'
- label: I/O PORTS
value: IEEE 488, I/O ports (8), Tape (2)
- label: POWER SUPPLY
value: Built-in PSU
- label: PRICE
value: £775 (UK, 1984)
tabs:
- photos
- hardware
- emulators
- links
- docs
photos:
- title: PET-4016
subtitle: ''
text: A CBM/PET-4000 computer with only 16k RAM.
image: /media/museum/photos/commodore_pet4016_2.jpg
- title: PET-4016
subtitle: ''
text: ''
image: /media/museum/photos/commodore_pet4016_3.jpg
- title: PET 4032
subtitle: ''
text: |-
actually a "fat-40"...
All PET/CBM 2/3/4xxx series had the small screen. The first large screen PETs were the CBM 8xxx series, afterwards Commodore added the larger screens to the 4xxx range and dropped the graphics keyboard as the system was targetted at business use.
image: /media/museum/photos/commodore_pet4032_3.jpg
- title: PET 4032 OPENED
subtitle: ''
text: ''
image: /media/museum/photos/commodore_pet4032_opened.jpg
- title: HYBRID PET-4032
subtitle: ''
text: This is a strange version. It is labeled PET-4032 but has a CBM keyboard (no graphics). It is a 4032 model but has a small screen just like a PET-2001... Even more enigmatic, it has a "PET 2001-32" label at the back.
image: /media/museum/photos/commodore_pet_4032_2.jpg
- title: 4032 MOTHER BOARD
subtitle: ''
text: |-
**(1)** IEEE488 port. Can adress up to 15 peripherals. Used for printer and disk drives.\
**(2)** User port. Includes parallel and video interfaces.\
**(3)** Tape-recorder port. Requires a specific Commodore tape-recorder to be used.\
**(4)** Second tape-recorder port.\
**(5)** Expansion connector.\
**(6)** ROM chip holding Commodore Basic language ver.4 and operating system.\
**(7)** Piezoelectric loudspeaker.\
**(8)** Keyboard connector.\
**(9)** 32 Kb. RAM chips, expandable to 96 Kb.\
**(10)** Chips in charge of handling the peripherals.\
**(11)** MOS 6502 microprocessor.\
**(12)** Interface and synchronization 6522 chip.\
**(13)** Characters generator chipset for upper case, lower case and graphic characters.
image: /media/museum/photos/s_commodore4000_motherboard.jpg
hardware:
- title: CLOCK/CALENDAR MODULE
subtitle: ''
text: Could be connected to any PET/CBM user port. Clock and calendar were battery backed up.
image: /media/museum/hardware/commodore_pet_clockmodule_1.jpg
- title: EPROM PROGRAMMER
subtitle: ''
text: Could burn 2716 and 2732 Eprom chips.
image: /media/museum/hardware/commodore_pet_epromprog_1.jpg
- title: TNW-2000
subtitle: IEEE-488 to Serial converter
text: Thanks to **Pascal Rollin**
image: /media/museum/hardware/commodore_pet_tnw2000_1.jpg
- title: DUAL DISK-DRIVES
subtitle: Model 2040
text: This dual 5.25" floppy disk is single sided, double density and has a storage capacity of 170 Kb per disk, or 360k total. It's connected to the computer through an IEEE-488 interface and uses CBM DOS 1.0.
image: /media/museum/hardware/commodore_cbm2040-dualdisks_1.jpg
- title: 8050 DUAL DISK-DRIVE
subtitle: ''
text: |-
CBM PET Model 8050 Dual disk drive. It uses a 100 TPI single headed drive with a storage capacity of 533,248 bytes per drive. Each 8050 disk has 77 tracks, and is read/write compatible with the model 8250 disk. This compatibility is limited to one side of the diskette.
It can be used with Commodore Series 2001, Series 3000, Series 4000 and Series 8000. It uses an IEEE-488 interface.
image: /media/museum/hardware/commodore_cbm_8050_diskdrives.jpg
- title: 8250-LP DUAL DRIVE UNIT
subtitle: ''
text: The 8250-LP (for Low Profile) uses dual half-size double-side, double-density 1 MB capacity floppy drives. The main logic board is entirely different from the full-size 8250. It uses two 6502 processors!
image: /media/museum/hardware/commodore_700_8250fddunit_1.jpg
- title: 9090 HARD-DISK
subtitle: ''
text: This is a single drive non-removeable Winchester technology storage device. It features 3 platters with recording surfaces on both sides and provides 7.5 million characters of storage. A single random access file may occupy the entire capacity. It has an IEEE interface connector and a "slow blow" fuse on the back.
image: /media/museum/hardware/commodore_cbm_9090_harddisk.jpg
- title: 8023P COMMODORE TRACTOR PRINTER
subtitle: ''
text: ''
image: /media/museum/hardware/commodore_printer_8032p.jpg
emulators:
- title: Versatile Commodore 8-bit Emulator (VICE)
url: http://www.6502.org/users/andre/index.html
platform: Windows
text: ''
links:
- title: Larry's PET/CBM Pages
url: http://www.portcommodore.com/petindex.php?path=main-cbmidx
text: Excellent source of information for PET/CBM computers
- title: PET index
url: http://www.6502.org/users/andre/petindex/index.html
text: Some useful info here about PET computers
- title: The Commodore CBM-II page
url: http://ca.geocities.com/SJGRAY@ROGERS.COM/CBM/
text: All things CBM-II
- title: THE Independent Commodore Library
url: http://freespace.virgin.net/ken.ross1/
text: All sorts of programs here, text files covering a wide range of subjects
- title: TPUG - Toronto PET Users Group Inc.
url: http://www.tpug.ca/
text: The Commodore PET Users Group, founded in 1979 ! (seems offline, mail us their new address if you find it)
- title: www.commodore.ca
url: http://www.commodore.ca/products/pet/commodore_pet.htm
text: Excellent site with a lot of info about Commodore computers including dedicated PET pages
- title: Web Wiz CAPTCHA
url: http://www.webwizcaptcha.com
text: Discussion about Commodore micros
docs:
- title: COMMODORE BASIC VERSION 4.0 - USER'S REFERENCE MANUAL
url: http://www.commodore.ca/manuals/default.htm
cover: /media/museum/docs/couvs/commodore_basic_4_users_reference%20manual.jpg
text: |-
[**COMMODORE BASIC VERSION 4.0 - USER'S REFERENCE MANUAL**](http://www.commodore.ca/manuals/default.htm)written by Commodore
 compiled/archived by www.commodore.ca\
 type of document : PDF\
 source : [www.commodore.ca](http://www.commodore.ca)
- title: COMMODORE PET MACHINE LANGUAGE MONITOR
url: http://www.commodore.ca/manuals/default.htm
cover: /media/museum/docs/couvs/pet_machine_language_monitor.jpg
text: |-
[**COMMODORE PET MACHINE LANGUAGE MONITOR**](http://www.commodore.ca/manuals/default.htm)written by Commodore
 compiled/archived by www.commodore.ca\
 type of document : PDF\
 source : [www.commodore.ca](http://www.commodore.ca)
comments:
- author: bacon man (USA)
date: Wednesday 12th August 2020
text: to browse this website
- author: Loren (Spain)
date: Saturday 2nd February 2019
text: '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: https://commodorepetmini.com'
- author: zozo (france)
date: Thursday 30th October 2014
text: 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!
- author: Craig Carr (USA)
date: Monday 18th January 2010
text: 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.
- author: Matt
date: Monday 13rd April 2009
text: 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.
- author: Skel (Oakville, Ontario, Canada)
date: Saturday 31st May 2008
text: '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...)'
- author: Neil Loughran (UK)
date: Wednesday 19th July 2006
text: 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...
- author: Charles Steadman (New Zealand)
date: Thursday 27th October 2005
text: 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? :-)
- author: j4ck (us)
date: Wednesday 30th March 2005
text: 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
- author: Gert-Jan Vons (The Netherlands)
date: Friday 31st January 2003
text: |-
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...
- author: Julian (Sydney, Australia)
date: Monday 19th August 2002
text: 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?
related:
- /museum/commodore-cbm-500-600-series
- /museum/commodore-cbm-700-series
- /museum/commodore-cbm-80xx
- /museum/commodore-pet-200
- /museum/commodore-pet-2001
- /museum/commodore-pet-30xx
- /museum/commodore-superpet
oc_id: 103
source:
url: https://web.archive.org/web/20230402091743/http://www.old-computers.com/museum/computer.asp?c=103
date: '2023-04-02'
---
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.