Qi 300 Jupiter Planar

Apricot QI-300 motherboard Look-over and quick test (YouTube)

Jupiter Planar Rev. C
Jupiter Planar Rev. D
Jupiter Planar Rev. E
Jupiter Planar Rev. F
Switch Settings
RAM Configuration
CMOS Discharge
System Firmware
   ROM Images
   BIOS Revision Levels

Based on Mitsubishi Electric's Insight CD pages.


Jupiter Planar Rev. C

Planar Revision History.


Jupiter Planar Rev. D

Planar Revision History.


Jupiter Planar Rev. E

Planar Revision History.


Jupiter Planar Rev. F

Planar Revision History.


Switch Settings

CPU Clock

CPU speed MHz Switch no ON
20 (not used) 1
16 2
12.5 3
10 4

Ethernet SW1

All ON BNC connector active
All OFF D-type connector active


RAM Configuration

1 or 2MB of On-Board Memory. To expand this further an expansion card must be fitted in one of the slots.

On-Board Module Product Code Total
1MB 1MB XB48036 2MB
1MB 2MB XB48037 3MB
1MB 4MB XB48038 5MB


CMOS Discharge

To drain CMOS remove battery and wait for approximately 20 minutes.


System Firmware (POST & BIOS)

Firmware stored in EPROM (2x 64 KB).

ROM Images

qi310223.zip - Qi 300 ROM BIOS 1.02.23 (LO+HI, zipped)

BIOS Revision Levels

BIOS Revision Summary (ver. 1.01.02 - 1.02.23)

Content created and/or collected by:
Louis Ohland, Peter Wendt, David Beem, William Walsh, Tatsuo Sunagawa, Jim Shorney, Tim Clarke, Kevin Bowling, Tomáš Slavotínek, and many others.

Ardent Tool of Capitalism - MAD Edition! is maintained by Tomáš Slavotínek.
Last update: 25 Nov 2022 - Changelog | Legal Info & Contact