---
title: MATSUSHITA National JR 300
categories:
- Computers
types:
- Home Computer
origins:
- Japan
years:
- '1984'
cpus:
- Zilog Z80A
params:
  name: National JR 300
  image: /media/museum/photos/jr300.jpg
  company: /companies/matsushita
  company_name: MATSUSHITA
  specs:
  - label: NAME
    value: National JR 300
  - label: MANUFACTURER
    value: Matsushita
  - label: TYPE
    value: Home Computer
  - label: ORIGIN
    value: Japan
  - label: YEAR
    value: '1984'
  - label: BUILT IN LANGUAGE
    value: JR Basic 5.0 and Extended Basic
  - label: KEYBOARD
    value: Full stroke keyboard, 98 keys, 6 function keys, separated numeric keypad
  - label: CPU
    value: Zilog Z80A + MN1800A (6802 compatible)
  - label: SPEED
    value: 4 Mhz (Z80A)
  - label: CO-PROCESSOR
    value: MN1544 and MN1542
  - label: RAM
    value: 82 kb
  - label: VRAM
    value: 52 kb
  - label: ROM
    value: '40 kb (Basic : 16k)'
  - label: TEXT MODES
    value: 80 x 25 / 40 x 25 / 32 x 24
  - label: GRAPHIC MODES
    value: 640 x 200 / 320 x 200 / 640 x 400
  - label: COLORS
    value: '8'
  - label: SOUND
    value: 3 channels, 8 octaves (Yamaha 8910)
  - label: SIZE / WEIGHT
    value: |-
      Keyboard : 390 × 198 × 38 mm / 1.6kg\
      Main unit : 390 × 350 × 80 mm / 4.8 Kg
  - label: I/O PORTS
    value: RGB video output, Monitor, Audio out, Expansion, Tape (600/2400 bauds), Centronics, Joysticks,
  - label: BUILT IN MEDIA
    value: None
  - label: POWER SUPPLY
    value: AC100V 50/60Hz
  - label: PERIPHERALS
    value: 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
  - label: PRICE
    value: 159000 yens
  tabs:
  - links
  forum_thread: 327
  links:
  - title: JR Japanese Museum
    url: http://dec.sakura.ne.jp/~hayashi/jr/index.html
    text: A lot of infos about the JR serie !
  oc_id: 321
  source:
    url: https://web.archive.org/web/20230605131228/http://www.old-computers.com/museum/computer.asp?c=321
    date: '2023-06-05'
---

The successor of the [JR 200](/museum/matsushita-national-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](/museum/sharp-x1-cz-800c/) 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.

<table> <tr> <td></td> <td>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.</td> <td></td> </tr> </table>