World Library  
Flag as Inappropriate
Email this Article

Ibm Jx


Ibm Jx

IBM JX Personal Computer (IBM 5511)
Developer IBM
Release date October 1984 (1984-10)
Operating system PC DOS 2.1, Microsoft Disk BASIC, Advanced BASIC
CPU Intel 8088 @ 4.77 MHz

The IBM JX (or JXPC) was a personal computer released in 1984 into the Japanese, Australian and New Zealand markets. Designed in Japan, it was based on the technology of the IBM PCjr and was designated the IBM 5511.


The IBM JX's main difference from the PCjr was a professional keyboard (rather than IBM PCjr's disparaged chiclet), dual 3.5" floppy drives, and a hard drive option.


It had several innovative features:

In Japan, both white and black units were available, but elsewhere all IBM JXs were black—very unusual in the days of the standard color of IBM "beige boxes".

However, one disadvantage it shared with the IBM PCjr was that it could not use the standard ISA bus cards of the PC XT.

The system operated PC DOS 2.11 as well as, Microsoft Disk BASIC and Microsoft Advanced BASIC. Like the IBM PC, if the system was left to boot without inserting a diskette into one of the drives the Microsoft Cassette BASIC interpreter would be loaded, which was compatible with IBM PCjr BASIC, including Cartridge BASIC. PC DOS 2.11 could only use half of the tracks of a 3.5" drive, however, since it didn't really understand what a 3.5" drive even was. The PCjx's BIOS could only address the first 40 tracks like a 5.25" drive.

The PCjx later had a BIOS upgrade chip, sold together with PC DOS 3.21, which could use the full 720 KB capacity of the diskette drives. Some popular options for the PCjx were a 10 MB external hard disk (as a stackable unit the same size as the JX itself) and a joystick. IBM never released a 3270 emulation adapter for the PCjx in order to steer enterprise customers to more expensive IBM PCs and XTs.

External links

  • IBM JX, The As-Yet Unnamed Computer Museum!!
  • 1984 (month unknown), Chronology of IBM Personal Computers (1983-1986), archive from the original on March 15, 2012.
  • Photo:Vintage IBM 5511
  • Japanese IBM JX commercial on YouTube
  • Australian IBM JX commercial on YouTube
  • Photo:IBM JX joystick
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.