I have Logic Unit JB-3001, two monochrome CRT Display JB-3062, Diskette Drive JB-3038
and keyboard.
type computer
country Japan
year 1984
os MS-DOS, Basic
cpu Intel 8088
speed 4.77 MHz
ram 128 KB
disk 2 x 8″ FDD
graphic 12″ Color 320 x 200 or Green 640 x 400 CRT
colors 8 or green
sound beeper
ports keyboard, composite, RGB, centronics
The Panasonic JB-3000 — The mybrain3000
The Panasonic JB-3000, marketed in some regions as the ”National mybrain3000,” was an early IBM PC-compatible computer produced by Matsushita Electric in approximately 1982 — one of the earliest IBM PC compatibles produced by a Japanese manufacturer. Using an Intel 8088 processor at 4.77 MHz and initially equipped with 8-inch floppy disk drives (unusual for a machine of this type), the JB-3000 was an ambitious early attempt to produce IBM PC compatibility in Japan. The machine could run MS-DOS and, unusually, also CP/M-86 — reflecting the uncertain operating system landscape of the very early 1980s.
8-inch Floppies — A Transitional Machine
The JB-3000’s use of 8-inch floppy disk drives rather than the 5.25-inch format that had become standard on the IBM PC reflected its design timing — the machine was developed before 5.25-inch drives had fully displaced 8-inch in professional computing environments. The 8-inch format provided larger storage capacity per disk, and many professional CP/M and early DOS environments still used 8-inch drives in the early 1980s. The JB-3000 thus straddles two eras of storage technology.
Rarity
The Panasonic JB-3000 is an exceptionally rare machine today — few examples survive, and it is little documented outside specialist collector communities. Its early date, unusual 8-inch drives, and Japanese manufacturer make it a historically distinctive artefact of the very early IBM PC compatibility era, when Japanese companies were among the first to produce IBM-compatible machines for international markets.