Re: Different versions of ROM 01 GS?

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

Labelas Enoreth <labelas@hotmail.com> wrote:

> Supertimer <supertimer@aol.com> wrote:
>
> > Apple never put a fan in the IIGS.  I suspect that the
> > one with the fan was user enhanced.

Apple did sell a fan as an optional accessory, and recommended that it
be installed if there are at least two cards installed in the IIgs.  I
have one in my main IIgs.

The power supply has a mounting position for the fan on its side, and
there is a power connector on the motherboard for it (+12V).

> If I may ask, what is the good of all the IIe connectors on my IIgs board?

For use in an upgraded IIe.  Apple supplied a kit that allowed a IIe to
become a IIgs.  Of the original IIe, all that is retained is the upper
part of the case (including the lid), the keyboard and the power supply.
The base plate, back panel and motherboard are replaced.  A IIgs sticker
was included which was stuck over the IIe logo.

> Oh yeah, and I shouldn't even bother plugging the keyboard plug from the
> PCT into that keyboard socket, right? The card will sense the IIgs ADB
> keyboard and enable it accordingly, correct?

Correct.  If the PC Transporter software detects that it is running in a
IIgs, it uses the IIgs keyboard registers to access the keyboard.  This
works with either the IIe keyboard or an external ADB one, but using the
IIe keyboard has the same limitations as normal (the numeric keypad, if
any, is treated like the corresponding standard keys).

The IIgs has a register which allows all the modifier keys (Ctrl, Shift
and Caps Lock) to be sensed directly.  This is the only useful function
provided by the PCT keyboard adaptor in a IIe, so it wouldn't achieve
much to use it in a IIgs.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand