ps2mouse.zip IBM PS/2 Mouse Program Diskette Ver 1.00
The keyboard and auxiliary-device connectors are 6-pin miniature DIN connectors. The signals and voltages are the same for both connectors.
The following figure shows the pin numbering and signal assignments for the auxiliary-device connectors.
Pin numbering and signal assignments for the keyboard connector plug-
Serial Mouse Conversion?
The "Serial Mouse" uses a RS-232 style interface with -5 to -12 VDC as logical "1" and +5 to +12 VDC as logical "0". The PS/2 mouse interface is a TTL-style interface, which uses 0 - +2 VDC as logical "0" and +3 - +5 VDC as logical "1".
In addition - and to make things worser - the RS-232 is an asynchronous interface, the PS/2 interface is a synchronous, where the data is sent along with a clock signal. It uses a simplified 4-wires serial interface with +5VDC (for the transceiver), GND, keyboard / mouse clock and keyboard / mouse data. The data and clock line can be used from the keyboard / mouse controller and the attached device as well following a particular handshake, which defines which is the active "sender" and which is the "receiver". So: it is not *that* easy conversing serial mouse to PS/2 and vice versa.
The "dual mode" mice have an automatic logic detection and sort of adaptive interface electronic, which detects whether the mouse is attached to a serial port or a PS/2 port and set the output drivers accordingly.
As you can see from the above: it is not enough only *physically* changing the plugs.
PS/2 Mouse Versions
From Fred Mau
Best as I can tell, IBM had five distinct species of Rattus
Armonkus in the PS/2 world: (Not to mention all the clones).
Best as I can tell, all the PS/2 mice (except the minnie
mouse for early thinkpads) are interchangeable, with one notable exception:
If you have an 8516 Touchscreen monitor, the touchscreen cable plugs into
the mouse port and the mouse plugs into the monitor, but it will ONLY work
with the original ugly mouse or the early oval mouse with white buttons.
From Jim Shorney:
From Carroll Bloyd
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