Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!uxc!deimos!rutgers!orstcs!sagen@nucthy.physics.orst.edu
From: sagen@nucthy.physics.orst.edu (Milt Sagen)
Newsgroups: comp.sys.ibm.pc
Subject: Problems with herc.bgi and logic tech mouse
Keywords: Turbo pascal 5.0, hercules bgi driver, LogiTech mouse driver
Message-ID: <8539@orstcs.CS.ORST.EDU>
Date: 29 Jan 89 22:49:36 GMT
Sender: usenet@orstcs.CS.ORST.EDU
Reply-To: sagen@nucthy.physics.orst.edu (Milt Sagen)
Organization: Dept. of Physics, Oregon State University
Lines: 23

I wrote a program to use the mouse following the articles published in Turbo
Technix, which in general works fine with ega and vga monitors, but when the
graphics driver is the Hercules bgi driver the minimum difference between
two positions of the mouse returned to my program is 8.  That is if the
first position of the mouse is x,y and the next position is (or at least
should be) one pixel to right (left, up, down, etc.) the value returned is
x+8,y.  

Its as if the lower three bits are always returned as 0's.

This only happens with the Hercules, and I have only been able to check it
with the Logitech mouse driver 6.10.  Has anyone else experienced similar
difficulties.

Note:  By simply calling the max rows and max columns functions for the
mouse I am able to get this version of the mouse driver to work correctly
with a vga monitor.  So that does not seem to be the problem here (I'm refer
of course to the comment of the author of the Turbo Technix articles
regarding problems with the vga and the Logitech mouse driver).
Milt Sagen                    Internet: sagen@nucthy.physics.orst.edu
Department of Physics
Oregon State University
Corvallis, OR  97331          Tele: (503) 754-4631