Re: Apple iigs ADB fails

["Michael J. Mahon" <mjmahon@aol.com>]

Michael Black wrote:
> "Michael J. Mahon" (mjmahon@aol.com) writes:
>
> > Wolfgang wrote:
> >
> > > Hi, I have a gs which has a smoked ADB port.
> > > It works fine except that I can not attach a keyboard (well I can but it 
> > > will not work)
> > >
> > > What would be a systematical way to figure out if I can repair it ?
> > > Or is any issue with the ADB the kiss of death and I can use him for 
> > > parts now?
> >
> > First, verify that the ADB socket and its PC board connections are
> > sound--sometimes it's just a broken connection from flexing.
> >
> > If that fails, you will probably need to replace the ADB controller
> > chip--for which the likely source is another (spare?) IIgs board. ;-(
>
> That's not one of the crossover ICs, that a relatively early Mac could
> supply as a transplant donor?

I'd be surprised--the IIgs was the *first* implementation of ADB,
and I'd bet that the microcontroller firmware changed quite a bit
by the time ADB showed up in Macs.

-michael

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