IBM JX

The IBM JX (or JXPC ) was a personal computer, which came in 1984 in the Asia -Pacific region on the market. It was based on the less successful IBM PCjr, but was further developed in Japan. He wore the IBM designation 5511th

Overview

Configuration

The IBM JX had the following features:

• Two DD -720 - KB 3.5 -inch floppy disk drives ( as opposed to a 5.25-inch drive on the PCjr )
• A professional keyboard, like the PCjr wirelessly
• 16-color graphics ( PCjr as )
• Side -Car port for extensions (such PCjr )

In Japan, both white and black appliances were available in other Asia-Pacific market all IBM JX were black. In the 1980s Beige was the dominant color for computer and peripheral housing, the choice of the color black is very unusual for this time, especially for a relatively conservative company like IBM.

The following weaknesses inherited from the IBM JX PCjr:

• He had no standard ISA bus slots for expansion
• Due to the lack of DMA controller he could not use the system level programmed applications for the IBM PC.

As the PCjr was 2:11 at the mercy of IBM JX with IBM PC -DOS. The operating system and the BIOS were taken from the PCjr without major modifications. This meant that on the 3.5 -inch diskette only half of the tracks could be used as BIOS and operating system as 360 responded the 3.5 -inch drives KB -5 ,25 -inch and addressed.

Later, IBM sold an upgrade kit consisting of PC-DOS 3:21 and a BIOS chip, which the full capabilities, or the full capacity of the disk drives finally made ​​available. Popular and frequent additional equipment for the IBM JX were an external 10MB hard drive, which could be docked in an IBM JX suitable enclosure on the side of this, as well as the IBM JX- joystick.