FTs / Qi 900 Scorpion Planar

Qi 900 Scorpion Planar
   CMOS Discharge
FTs Scorpion Planar
   CMOS Discharge
Switch Settings
CMOS Discharge
System Firmware
   ROM Images
   BIOS Revision Levels

Information sourced from Mitsubishi Electric's Insight CD page.

Qi 900 Scorpion Planar

Planar Revision History.

CMOS Discharge

To drain CMOS remove the battery and wait approx. 20 minutes to drain.

FTs Scorpion Planar

Planar Revision History.

CMOS Discharge

To remove settings in CMOS the ribbon cable running from the Front Panel to the I/O Board should be disconnected and then left for approx. 20 minutes.

Switch Settings


Pos. Second Floppy
A 5.25"
B 3.5"


Pos. Second Floppy
A Present
B Not present


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 Titan backplane No Titan
* PAL required to enable

RAM Configuration

Memory Fitted SW4 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 SW4 Position
4 5
25 Off On


Default position is A

System Firmware (POST & BIOS)

Firmware stored in EPROM (2x 64 KB).

ROM Images

qi910224.zip - Qi 900 ROM BIOS 1.02.24 (LO+HI, zipped)
fts10226.zip - FTs Scorpion 1.02.26 (LO+HI, zipped)

BIOS Revision Levels

Qi 900 BIOS Revision Summary (ver. 1.02.18 - 1.02.25I)
FTs BIOS Revision Summary (ver. 1.02.23 - 1.02.26)

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