Re: ADB mouse compatibility on IIgs?

["Liam Busey" <buseyl@yahoo.com>]

"ToasterKing" <toasterking@SPLATbigfoot.com> wrote in message
240420042055564068%toasterking@SPLATbigfoot.com">news:240420042055564068%toasterking@SPLATbigfoot.com...
> Hi!  I'd like to be able to use a third-party mouse with my IIgs.  The
> reason I'd like to do this is because I have an ADB/audio switchbox,
> and I share the same speakers and keyboard and mouse between my Mac and
> my IIgs.  The Apple Desktop Bus Mouse and Apple Desktop Bus Mouse II
> work fine with the IIgs, but I'd like to get a mouse with more features
> for my Mac (and hence my GS), and need one that would be compatible
> with both.
>
> I've tried a MacAlly 2-button ADB mouse, and also about 4 PS/2 mice
> using a PS/2-to-ADB adapter.  With every mouse I've tried, the GS
> updates the mouse location very slowly in GS/OS and the faster the
> mouse is moved, the slower the pointer moves.  In addition, if I move
> the mouse at all while GS/OS is not running, the GS crawls -- screen
> drawing, executing, keyboard input, etc., until I unplug the mouse.
>
> So, does the GS require a special kind of ADB mouse?  Are the
> third-party mice I'm using perhaps not 100% compliant with Apple's
> timing spec for ADB, or sampling at a different resolution?  (I know
> the MacAlly 2-button ADB mouse uses lower resolution.)  Does the GS
> hardware/firmware require a specific resolution for the mouse?
>
> Thanks!

Hello ToasterKing,

have you tried hooking the ADB mouse directly  up to the IIgs? If it works
fine on the IIgs the problem may be with your switch.

I have an ADB switchbox (manual) myself and found that power to the ADB port
was interrupted every time I switched between systems. As a result, the
mouse tracking was messed up until the system was reset.  I modified my KVM
to constantly supply  power to all the ADB ports from one port and the
problem went away.  It is necessary to switch to the each system when it
first powers up though (for initialization purposes I suppose.)

I also have a Microview PS/2 to ADB converter. All the mice I've tried seem
to work pretty well but the keyboard  will only work correctly on a ROM 3
IIgs. Must have something to do with the ROM 1's early implementation of
ADB.

- Liam