Re: gs mother boards

[dempson@actrix.gen.nz (David Empson)]

Charlie Springer <RAM@regnirps.com> wrote:

> I have a bunch of gs's and some Apple Service mother boards. One of them I
> tested today has a problem and won't boot. However, I noticed that it has the
> connectors for the IIe power supply and keyboard in place (the holes are
> soldered over in the other gs motherboards).
> 
> Is this an early MB or is it perchance the one meant for use in the IIe?
> Maybe I should fix it?

The original IIgs motherboard (ROM 00/01, 256 KB RAM) was designed to
work in either a IIgs or IIe case (if both sets of conectors were
installed). The 1 MB or ROM 3 motherboard could not be used in a IIe
case.

The presence of the IIe connectors has no effect on the ability of the
motherboard to work in a IIgs case, or with a IIgs power supply. If it
won't boot, there is something else wrong with it.

A board with those connectors is more likely to have the ROM 00 firmware
(or have previously been upgraded to ROM 01), and might have had the
faulty Video Graphics Controller chip, but neither of these would affect
its ability to boot at least as far as the beep and "Apple IIgs" text
display.

Try removing and reinserting all socketed chips (observing anti-static
precautions, with the power off, of course). If that doesn't work, it is
likely to have a fault such as corrosion, dry joints, broken tracks,
etc.

-- 
David Empson
dempson@actrix.gen.nz