Qi 600 Neptune Planar

Neptune Planar Rev. E
Neptune Planar Rev. G
Switch Settings
CMOS Discharge
System Firmware
   ROM Images
   BIOS Revision Levels

Information sourced from Mitsubishi Electric's Insight CD pages.

Neptune Planar Rev. E

Planar Revision History.

Neptune Planar Rev. G

Planar Revision History.

Switch Settings


Pos. On Off
1 Pipeline 386 enable Pipeline 386 disable
2 Pipeline 385 enable Pipeline 385 disable
3 ROM's disabled ROM's enabled
4 Refresh enabled Refresh disabled


Pos. On Off
1 RAM configuration
2 RAM configuration
3 RAM configuration
4 CPU speed select
5 CPU speed select
6 Not currently used
7 *Weitek present Weitek not present
8 Not currently used
* PAL required to enable


Memory Fitted SW2 Position SIMM Capacity
1 2 3 Bank 0 Bank 1
1 MByte Off Off Off 256k -
1 MByte On Off Off 256k -
2 MByte Off On Off 256k 256k
4 MByte Off Off On 1 M -
5 MByte On On Off 256k 1 M
8 MByte On Off On 1 M 1 M
12 MByte Off On On 2 M 1 M
16 MByte On On On 2 M 2 M

Clock Speed

CPU speed MHz SW2 Position
4 5
25 MHz Off On


Pos. Description
A Routes high resolution video clocks
B High resolution video required

SW4 Rev. E / SW53 Rev. G - Ethernet Configuration

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

SW4 Rev. G

Pos. Description
A Routes composite sync pulses to the Video DAC
B Composite sync pulses required

CMOS Discharge

To drain CMOS remove the battery and connect a 10 Ohm resistor between TP13 and TP14.

If no resistor is available then it will take approx. 20 minutes to drain.

System Firmware (POST & BIOS)

Firmware stored in EPROM (2x 64 KB).

ROM Images

qi610223.zip - Qi 600 ROM BIOS 1.02.23 (LO+HI, zipped)

BIOS Revision Levels

BIOS Revision Summary (ver. 1.02.07 - 1.02.23)

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

Ardent Tool of Capitalism is maintained by Tomáš Slavotínek.
Last update: 08 May 2024 - Changelog | About | Legal & Contact