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M > MATSUSHITA  > National JR 300   

National JR 300

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 pong ! 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 or one of our partners.



NAME  National JR 300
YEAR  1984
BUILT IN GAMES  JR Basic 5.0 and Extended Basic
CONTROLLERS  Full stroke keyboard, 98 keys, 6 function keys, separated numeric keypad
CPU  Zilog Z80A + MN1800A (6802 compatible)
BUTTONS  4 Mhz (Z80A)
SWITCHES  MN1544 and MN1542
SCORE  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
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
I/O PORTS  RGB video output, Monitor, Audio out, Expansion, Tape (600/2400 bauds), Centronics, Joysticks,
GUN  JR-F01 5''1/4 disk units, JR-F02 additional disk-drive, JR-F03 3''1/2 disk-drives, JR-F04 additional 3''1/2 diks-drive, JR-P01 Graphic printer, RQ-8300 & RQ-8200 tape-recorders
PRICE  159000 yens

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