--- 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 forum_thread: 117 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) 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.