Category: mouse/pointing device
INT 33 - MS MOUSE - GET VERSION STRING
AX = 006Dh 'm'
Return: ES:DI -> Microsoft version number of resident driver (see #03187)
Notes: also supported by Logitech, Mouse Systems, Kraft, and Genius mouse
the Mouse Systems 7.01 and Genius Mouse 9.06 drivers report their
Microsoft version as 7.00 even though they do not support any of the
functions from 0025h through 002Dh supported by the MS 7.00 driver
(the Genius Mouse driver supports function 0026h, but it differs
from the Microsoft function)
the TRUEDOX 4.01 driver reports its version as 6.26 through this call,
but as 6.24 through AX=0024h
There seems to be no reliable method to distinguish MS MOUSE before
3.00 from mouse drivers of other vendors.
Some releases of the MS MOUSE 6.00 erroneously return 6.01 instead of
their true version number. In this case, a DI value of 01ABh can
be used to still detect a 6.00 driver.
For returned versions 6.02+, INT 33/AX=0024h should be used to retrieve
more accurate version data.
True MS MOUSE drivers can also be identified by magic numbers in
their copyright message, stored in the driver's segment (ES).
These can be found by scanning the first 2 Kb of the mouse
driver's segment for a string like: [new since 7.00+]
"** This is Copyright 1983[-19xx] Microsoft ***" with the
magic number stored one byte after the signature string.