Re: ADB mouse compatibility on IIgs?

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

"Rubywand" <rubywand@swbell.net> wrote in message
408D4EC7.89926D5B@swbell.net">news:408D4EC7.89926D5B@swbell.net...
> Liam Busey writes ...
> >
>  ....
>
> > 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.
>
>  ....
>
>      Most likely. The main switchover happened when Apple introduced the
ROM-01
> motherboard in 1987. That left thousands of ROM-00 motherboard IIgs's
which had
> been upgraded to "ROM-01" but still had the original ADB IC's.
>
>      Evidently, Kensington designed and tested it's TurboMouse using the
newer
> IIgs. For sure, they were surprised when reviewers reported the product
would
> not work on the ROM-00 boards upgraded to ROM-01. (Seems like I ended up
with
> three TurboMouses before we agreed that, whether or not the ROM-00 board
ADB
> IC's always worked correctly, they were just plain incompatible with
> TurboMouse.)
>
>
>      The problems with bad ADB chips on some of the early IIgs's became
> legendary as did the system crash error message with the 01 ROM installed:
> "FATAL SYSTEM ERROR 0911".
>

Thanks Rubywand, this is good to know. I had been under the impression that
ROM 0 and factory ROM1 IIgs motherboards were pretty much the same with the
exception of faulty VGS's. Do you know how to identify which ADB
controller's are at fault? I'd like to try my PS/2 to ADB converter on a ROM
1 with the newer ADB controller.

Thanks,
Liam