The successor of the JR 200. Almost everything was changed, the computer has two CPUs to keep the compatibility with the previous models (JR-200). This machine has also a superimposition feature.
In fact it seems to be a mix between a JR-200 and a Sharp X1 system... quite strange ! But apparently this model was never really marketed.
A handheld model called JR 800 was launched few time later, but it was not compatible with the previous JR computers.
We need more info about this computer ! If you designed, used, or have more info about this system,
please send us pictures or anything you might find useful.
Please consider donating your old computer / videogame system to Old-Computers.com or one of our partners from anywhere in the world (Europe, America, Asia, etc.).
Doraemon was made by Matsushita too
Sunday 30th April 2023
Jaume De La Vega (España)
NAME
National JR 300
MANUFACTURER
Matsushita
TYPE
Home Computer
ORIGIN
Japan
YEAR
1984
BUILT IN LANGUAGE
JR Basic 5.0 and Extended Basic
KEYBOARD
Full stroke keyboard, 98 keys, 6 function keys, separated numeric keypad
CPU
Zilog Z80A + MN1800A (6802 compatible)
SPEED
4 Mhz (Z80A)
CO-PROCESSOR
MN1544 and MN1542
RAM
82 kb
VRAM
52 kb
ROM
40 kb (Basic : 16k)
TEXT MODES
80 x 25 / 40 x 25 / 32 x 24
GRAPHIC MODES
640 x 200 / 320 x 200 / 640 x 400
COLORS
8
SOUND
3 channels, 8 octaves (Yamaha 8910)
SIZE / WEIGHT
Keyboard : 390 × 198 × 38 mm / 1.6kg Main unit : 390 × 350 × 80 mm / 4.8 Kg
