IBM PC Jr
IBM PC Jr

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Info
   
Setname:  ibmpcjr   
Year: 1983
Manufacturer: International Business Machines
Status: imperfect  badworks
Type: Buisness Computer / Terminal
Parent: IBM PC 5150
Emulation info
   
Overall emulation:  good   
Color emulation:  imperfect  
Sound emulation:  good  
Graphics emulation:  good  
Savestates:  unsupported   

Tech info
 Base hardware: (available in all slot configurations)
Chips
I8088 ("maincpu")cpu 4900000 Hz
Speaker ("mono")audio
Filtered 1-bit DAC ("speaker")audio
SN76496 ("sn76496")audio 3579545 Hz
Screens
Screen ("pcvideo_pcjr:screen")raster horizontal 640 x 200 @ 59.922748
Media devices
cassette ("cassette") cassette cass wav
floppydisk ("fdc:0:525dd") floppydisk flop dsk, ima, img, ufi, 360, d77, d88, 1dd, dfi, imd, ipf, mfi, mfm, td0, cqm, cqi
cartridge ("cartslot1") cartridge1 cart1 bin, jrc
cartridge ("cartslot2") cartridge2 cart2 bin, jrc
RAM options
640K 655360
Software lists
ibmpcjr_cartoriginal
ibmpcjr_floporiginal

 Optional hardware: (available with specific slot configurations)

 Configure the slot options for ibmpcjr:
 Slot Value
 lpt_0:centronics 
 pc_joy 
 serport 
 


Show detailed info about 'Slot Options' of this system
Slot options

NameValueCompatible device(s)
lpt_0:centronics ap2000ap2000
 covoxcovox
 covox_stereocovox_stereo
 ex800ex800
 lx800lx800
 lx810llx810l
 pl80comx_pl80
 printer centronics_printer
pc_joy basic_joy basic_joy
 mssw_padmssw_pad
serport microsoft_mousemicrosoft_mouse
 mousesys_mousemouse_systems_mouse

Romset info
ROM NameSizeCRC32SHA1Dump StateBIOS option
bios.rom65536 31e3a7aa1f5f7013f18c08ff50d7942e76c4fbd782412414good
cga.chr4096 42009069ed08559ce2d7f97f68b9f540bddad5b6295294ddgood
Sysinfo



Features


* CPU: Intel 8088 4.77 MHz
* Co-Processor: Texas Instrument sn76496 n (Sound)
* RAM: 64k (up to 640 KB); Extended model : 128k
* VRAM: from 2k to 128k (use the conventional RAM)
* ROM: 24 KB
* Text Modes: 40 x 25 / 80 x 25
* Graphic Modes: 160 x 200 (16 colors), 320 x 200, 640 x 200
* Colors: 16
* Sound: three channels
* I/O Ports: 2 cartridge ports (64 KB each), Centronics (optional), RS232, Joystick, Light Pen, video out (RCA plug)
* Keyboard: Chiclet keyboard (full-stroke keyboard was available later)
* Built In Media: one 5.25" disk drive
* OS: MS DOS


Known Issues


The driver is currently under heavy rewrite. Graphic emulation is good and both cart and tape support have been added. On the other hand, there are still known bugs (e.g. in the hard disk emulation).


History and Trivia


Enhanced IBM PC for home use.

After launching the IBM PC (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.

Despite its qualities, the PC jr had few success and never managed to replace the established home computers like Commodore 64, Apple II or Atari 800.

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).

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.

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).

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.

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.

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.

(info from old-computers.com)


Links


* Forever70...80...90... -- http://perso.orange.fr/fabrice.montupet/ibm.htm
* Mike's PCjr Page -- http://mail.magnaspeed.net/~mbbrutman/PCjr/pcjr.html
* PC Jr. Reborn -- http://www.micro-zone.com/index.html
* PC Junior at old-computers.com -- http://old-computers.com/museum/computer.asp?c=186



Edit the History info for this game.

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