This PS/2 wheel mouse WORKS with all 3 of these SERIAL adapters.. yet, they are not the same!
I have tested them on a VIA MVP3 Mobo with Win98SE.
The attachment IntelliMouse Serial&PS2 with Wheel.jpg is no longer available
Here are their pinouts:
Grey Adapter:
SERIAL fem. con.__________PS/2 female connector
Pin1 N.C. xxx(Not Connected)xxx. Pin1 [M.Data] strapped to PS/2 Pin5 [M.Clock]
Pin2------------to----------Pin2 [K.Data]
Pin3------------to----------Pin6 [K.Clock]
Pin4[strapped to SERIAL Pin6]
Pin5------------to----------Pin3 [GND]
Pin6[strapped to SERIAL Pin4]
Pin7------------to----------Pin4 [+5V]
Pin8 N.C.
Pin9 N.C.
Red Adapter (identical to Gray adapter, but missing the strap between PS/2 pins 1&5):
SERIAL fem. con.__________PS/2 female connector
Pin1 N.C.
Pin2------------to----------Pin2 [Keyboard Data]
Pin3------------to----------Pin6 [Keyboard Clock]
Pin4[strapped to SERIAL Pin6]
Pin5------------to----------Pin3 [GND]
Pin6[strapped to SERIAL Pin4]
Pin7------------to----------Pin4 [+5V]
Pin8 N.C.
Pin9 N.C.
Green Adapter:
SERIAL fem. con.__________PS/2 female connector
Pin1 N.C.
Pin2------------to----------Pin2 [Keyboard Data]
Pin3------------to----------Pin6 [Keyboard Clock]
Pin4[strapped to SER.Pin6]--to--Pin1 [M.Data]
Pin5------------to----------Pin3 [GND]
Pin6[strapped to SER.Pin4]--to--Pin1 [M.Data]
Pin7------------to----------Pin5 [M.Clock]
Pin8------------to----------Pin4 [+5V]
Pin9 N.C.
The Gray Adapter design was also confirmed working by another user here that has it(@Jason21), on this other model:
2-button "Microsoft Serial-Mouse Port Compatible Mouse 2.0" P/N 58264:
The attachment Jason21's mouse 2-button (P.N.58264).jpg is no longer available
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MICROSOFT branded adapter but with different pinout, found here on the forum. Comes in 2 different colors. No confirmation yet on what revision mouse it works with, but it did NOT work with the P/N 58264 mouse in the previous picture
Thanks to @Jason21 and @DaveDDS for their contributions!
Re: Microsoft Serial Compatible Mouse only works in PS/2 mode
Re: Microsoft Mouse 2.1A not recognized
The attachment DaveDDS' Microsoft 68666 Adapters.JPG is no longer available
Microsoft P.N.68666 Adapter(s):
SERIAL fem. con.__________PS/2 female connector
Pin2------------to----------Pin2 [Keyboard Data]
Pin3------------to----------Pin6 [Keyboard Clock]
Pin4[strapped to SER.Pin6]--to--Pin5 [Mouse Clock]
Pin5------------to----------Pin3 [GND]
Pin6[strapped to SER.Pin4]--to--Pin5 [Mouse Clock]
Pin7------------to----------Pin4 [+5V]
An unconfirmed adapter, pinout from user @Jason21. Unknown what it works with.
Microsoft Serial Compatible Mouse only works in PS/2 mode
Unknown-compatibility Adapter:
SERIAL fem. con.____________PS/2 female connector
Pin1------------to-------------Pin1 [M.Data]
Pin2[strapped to SER.Pins5,7]--to--Pin4 [+5V]
Pin3[strapped to SER.Pin9]----to--Pin3 [GND]
Pin5[strapped to SER.Pins2,7]--to--Pin4 [+5V]
Pin6 ------------to------------Pin5 [M.Clock]
Pin7[strapped to SER.Pins2,5]--to--Pin4 [+5V]
Pin9[strapped to SER.Pin3]----to--Pin3 [GND]
Another unconfirmed Blue Adapter, pinout from user @luRaichu. Unknown what it works with.
Re: Microsoft Mouse 2.1A not recognized
Unknown Blue Adapter (with possible unmapped "strap" for pinout)
SERIAL fem. con.__________PS/2 female connector
Pin2------------to----------Pin1 [Mouse Data]
Pin3------------to----------Pin6 [Keyboard Clock]
Pin4------------to----------Pin4 [+5V]
Pin5------------to----------Pin3 [GND]
Pin7------------to----------Pin5 [Mouse Clock]