yann64andClaude Opus 5.5
b274874139
1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
285 lines
11 KiB
Markdown
285 lines
11 KiB
Markdown
---
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title: IBM PC Junior
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categories:
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- Computers
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types:
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- Home Computer
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origins:
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- U.S.A.
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years:
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- '1983'
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cpus:
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- Intel 8088
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params:
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name: PC Junior
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image: /media/museum/photos/ibm_pcjr_system_1.jpg
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company: /companies/ibm
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company_name: IBM
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specs:
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- label: NAME
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value: PC Junior
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- label: MANUFACTURER
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value: IBM
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- label: TYPE
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value: Home Computer
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- label: ORIGIN
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value: U.S.A.
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- label: YEAR
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value: November 1983
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- label: END OF PRODUCTION
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value: March 1985
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- label: KEYBOARD
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value: Chicklet keyboard (full stroke keyboard was available later)
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- label: CPU
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value: Intel 8088
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- label: SPEED
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value: 4.77 MHz
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- label: CO-PROCESSOR
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value: Texas Instrument sn76496 n (sound)
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- label: RAM
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value: |-
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64k (up to 640 KB)\
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Extended model : 128k
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- label: VRAM
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value: from 2k to 128k (use the conventional RAM)
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- label: ROM
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value: 24 KB
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- label: TEXT MODES
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value: 40 x 25 / 80 x 25
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- label: GRAPHIC MODES
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value: 160 x 200 (16 colors), 320 x 200, 640 x 200
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- label: COLORS
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value: '16'
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- label: SOUND
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value: three channels
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- label: SIZE / WEIGHT
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value: Unknown
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- label: I/O PORTS
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value: 2 cartridges ports (64 KB each), Centronics (optional), RS232, Joystick, Light Pen, video out (RCA plug)
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- label: BUILT IN MEDIA
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value: one 5.25'' disk drive
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- label: OS
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value: MS DOS
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- label: POWER SUPPLY
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value: External PSU
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- label: PRICE
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value: Unknown
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tabs:
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- photos
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- adverts
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- hardware
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- software
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- links
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- docs
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forum_thread: 196
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photos:
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- title: IBM PCJR IN ALL ITS GLORY
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subtitle: ''
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text: Picture courtesy of Verault ebay seller
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image: /media/museum/photos/ibm_pcjr_allglory_1.jpg
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- title: MAIN UNIT
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subtitle: ''
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text: ''
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image: /media/museum/photos/ibm_pcjr_system_s3.jpg
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- title: COMPLETE SYSTEM
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subtitle: ''
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text: Complete system with its massive AC adaptor and a monochrome composite monitor.
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image: /media/museum/photos/ibm_pcjr_withmonitor_s1.jpg
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- title: PRO VERSION
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subtitle: ''
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text: This model is equipped with a PC professionnal keyboard, a second disk-drive unit on top of the computer, and a RAM expansion plugged to the right of the case.
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image: /media/museum/photos/ibm_pcjr_4.jpg
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- title: SIDES
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subtitle: ''
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text: On the right side, the JrCaptain sidecar expansion provided 128 KB RAM expansion, a standard Parallel printer interface and a real time clock.
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image: /media/museum/photos/ibm_pcjr_sides_s1.jpg
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- title: PCJR COLOR MONITOR
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subtitle: ''
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text: Thanks to **Edwin Amsler**
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image: /media/museum/photos/ibm_pcjr_colmonitor_s1.jpg
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- title: ORIGINAL CHICKLET KEYBOARD
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subtitle: ''
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text: ''
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image: /media/museum/photos/ibm_pcjr_keyboardbox_1.jpg
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- title: 'SECOND KEYBOARD #1'
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subtitle: ''
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text: Below the typewriter keys, this second version also used a rubber membran.
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image: /media/museum/photos/ibm_pcjr_keyboard_s1.jpg
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- title: 'SECOND KEYBOARD #2'
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subtitle: ''
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text: The keyboard could be either connected to the main unit by a standard cord, or used without cord, from a distance up to 6 meters, thanks to its dual infrared LEDs.
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image: /media/museum/photos/ibm_pcjr_keyboard_s2.jpg
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- title: REAR SIDE
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subtitle: ''
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text: |-
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**(1)** Parallel connector from the JrCaptain sidecar expansion\
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**(2-3)** Joystick connectors\
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**(4)** Printer connector\
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**(5)** Keyboard connector\
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**(6)** Light pen connector\
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**(7)** TV set connector\
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**(8)** Conposite video output jack\
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**(9)** Optional modem hole\
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**(10)** IBM Colour monitor connector\
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**(11)** Serial connector\
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**(12)** Tape recorder connector\
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**(13)** Power connector and switch\
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**(14)** External audio jack.
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image: /media/museum/photos/ibm_pcjr_rearside_s1.jpg
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- title: OPENED
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subtitle: ''
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text: |-
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**(1)** Power supply card\
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**(2)** 128 KB expansion card\
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**(3)** Floppy drive controller card\
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**(4)** Infrared receiver.
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image: /media/museum/photos/ibm_pcjr_inside_s1.jpg
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- title: 'MOTHERBOARD #1'
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subtitle: ''
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text: |-
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**(1)** Buzzer\
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**(2)** Tape recorder remote control relay\
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**(3)** Various I/O chips from Intel, AMD and NEC\
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**(4)** Motorola 6845 display controller\
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**(5)** Custom IBM memory management chip\
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**(6)** Power card connector\
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**(7)** Memory expansion connector\
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**(8)** 64 KB RAM chips (8 x 4164)\
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**(9)** Infrared receiver\
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**(10)** Modem card (left) and FDD controller card connectors\
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**(11)** 24 KB ROMs, hold the Cassette BASIC interpreter\
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**(12)** ROM cartridges connectors\
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**(13)** Bus expansion connector\
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**(14)** Intel 8088 microprocessor.
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image: /media/museum/photos/ibm_pcjr_mainboard_s1.jpg
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- title: 'MOTHERBOARD #2'
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subtitle: ''
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text: Close-up view of the infrared receiver and dual cartridge connectors.
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image: /media/museum/photos/ibm_pcjr_mainboard_s2.jpg
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- title: PCJR MANUALS
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subtitle: ''
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text: ''
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image: /media/museum/photos/ibm_pcjr_manuals_s1.jpg
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- title: SAMPLER DISKETTE
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subtitle: ''
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text: |-
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Cover of the Sampler diskette.\
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Typical pictures of the personal computer use of the time: Business, home, school, for people of all ages.
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image: /media/museum/photos/ibm_pcjr_samplerdisk_s1.jpg
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adverts:
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- title: 'ADVERT #1'
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subtitle: ''
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text: ''
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image: /media/museum/pubs/ibm_pcjr_pub_1.jpg
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hardware:
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- title: ADAPTER CABLE FOR SERIAL DEVICES
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subtitle: ''
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text: This IBM PC jr option allows many serial devices to be connected, such as printers and external modems.
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image: /media/museum/hardware/ibm_pcjr_serialadaptbox_1.jpg
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- title: ADAPTER CABLE FOR THE IBM COLOR DISPLAY
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subtitle: ''
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text: This IBM PC jr option allows you to attach the IBM Personal Computer Color Display to the IBM Pc jr system unit.
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image: /media/museum/hardware/ibm_pcjr_color-display-cable_box_1.jpg
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- title: BASIC CARTRIDGE
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subtitle: ''
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text: Thanks to **Edwin Amsler**
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image: /media/museum/hardware/ibm_pcjr_basiccart_s1.jpg
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- title: 64K RAM EXPANSION
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subtitle: ''
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text: This add-on doubles the existing RAM of the PC Jr. System and provides 80 Column text support.
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image: /media/museum/hardware/ibm_pc-jr_64k.jpg
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- title: 128K RAM ''SIDE-CAR'' EXPANNSION
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subtitle: ''
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text: The expansion is plugged on the right side of the main-unit. Several expansions could be plugged to each other like this.
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image: /media/museum/hardware/ibm_pcjr_128k_extension.jpg
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- title: 3 SIDE-CAR EXPANSIONS
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subtitle: ''
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text: Here there are 3 side-car extensions plugged into each other on the right side of the main unit (2 128k RAM extensions and 1 printer interface).
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image: /media/museum/hardware/ibm_pcjr_triple_extension.jpg
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- title: PARALLEL PRINTER ATTACHMENT
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subtitle: ''
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text: This unit is used to use any parallel printer with a PC Junior. It plugs onto the right-hand side of the computer.
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image: /media/museum/hardware/ibm_pcjr_parallel-printer-attachment_1.jpg
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- title: JOYSTICK
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subtitle: ''
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text: This joytsick is only compatible with the PC Junior
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image: /media/museum/hardware/ibm_pc_junior_joystick.jpg
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- title: JOYSTICK BOX
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subtitle: ''
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text: ''
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image: /media/museum/hardware/ibm_pcjr_joystick-box_1.jpg
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- title: JOYSTICK PINOUTS
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subtitle: ''
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text: |-
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1 - +5v DC\
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2 - Res. Y-Axis\
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3 - Logic ground\
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4 - Key\
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5 - Fire button\
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6 - Fire button\
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7 - Res. X-Axis\
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8 - Shield ground
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image: /media/museum/hardware/ibm_pcjunior_joystick_pinout.gif
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- title: COMPACT THERMAL PRINTER
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subtitle: Model 5181
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text: ''
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image: /media/museum/hardware/ibm_pcjr_compact-thermal-printer_1.jpg
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screenshots:
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- title: CROSSFIRE
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subtitle: cartridge label
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text: ''
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image: /media/museum/software/ibm_pcjr_crossfire-cart.jpg
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- title: MINESHAFT
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subtitle: cartridge label
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text: ''
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image: /media/museum/software/ibm_pcjr_mineshaft-cartridge_1.jpg
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- title: KING'S QUEST
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subtitle: cartridge label
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text: Thanks to James R. Skinner for this picture
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image: /media/museum/software/ibm_pcjunior_kingsquest.jpg
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links:
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- title: Forever70...80...90...
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url: http://perso.wanadoo.fr/fabrice.montupet/ibm.htm
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text: Nice page about the PC junior (french)
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- title: Mike's PCjr Page
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url: http://mail.magnaspeed.net/~mbbrutman/PCjr/pcjr.html
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text: Too much things in there to lis them all. Go & visit!
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- title: PC Jr Reborn!
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url: http://www.micro-zone.com
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text: Forums, Software, News, Links and more
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- title: PCjr.org
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url: http://www.pcjr.org/
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text: Very complete site, worth a visit
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docs:
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- title: GUIDE TO OPERATIONS
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url: null
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cover: /media/museum/docs/couvs/ibm_pc-jr_guide-to-operations.jpg
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text: |-
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**GUIDE TO OPERATIONS**\
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written by IBM
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compiled/archived by Eric Bylenga\
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type of document : PDF\
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source : www.old-computers.com
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oc_id: 186
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source:
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url: https://web.archive.org/web/20230130041031/http://www.old-computers.com/museum/computer.asp?c=186
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date: '2023-01-30'
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---
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After launching the [IBM PC](/museum/ibm-pc-model-5150/) (and its great success), IBM tried to stand out a standard for home computers, it created then the PC junior, which itself is a "light" version of the PC especially designed for home activities.
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Despite its qualities, the PC jr had few success and never managed to replace the established home computers like [Commodore 64](/museum/commodore-c64/), [Apple II](/museum/apple-ii/) or [Atari 800](/museum/atari-400/).
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Two IBM PC junior models were available: a basic one and a enhanced one (supplied with 128k, 30 programs, a 5.25" floppy disk drive \[360 KB\] and its controller).
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Contrary to the IBM PC, the power supply is not integrated to the case, but is external. The keyboard is linked by infra-red to the CPU, though there was a RJ11 (standard phone jack) plug that could be used instead to save batteries. It is impossible to connect a 8087 math co-processor.
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The RS232 connector is not a standard one. To use a standard RS232 device, the user has to buy a special adapter ("Berg" style connector breakout -> D25 connector).
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The PC Jr runs under MSDOS 2.1 (the same version as the PC) and handles a hard disk when it is not possible to connect hard disk on the PC Jr (go figure)! There was an internal modem available that ran at 300 bps sold by IBM. Third party modems were also available at 1200bps.
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A cartridge containing enhanced basic (with special graphics instructions) was also available. To get a 80 column text display, the extra 64k RAM expansion is needed.
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Many IBM PC programs would not originally run on the PCjr because it did not include a DMA controller. This was available through a memory side-car add-on from Tecmar Systems. Many people were able to then run the PCjr as a competent business type of system as well.
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