Re: Do it yourself upgrade: IIgs ROM 01?

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

Dietmar Krueger <dkrueger@oec.uni-osnabrueck.de> wrote:

> Lately I have got an Apple IIgs ROM 0 Machine. I want to upgrade it to ROM
> 01. So I downloaded the ROM 01 files but I cant burn a 128kByte EPROM (only
> smaller 32kByte EPROMS). 

Even if you could burn a 128KB EPROM, it won't physically fit in the
motherboard (you would need an adaptor plug to get the signals into the
right locations).  128KB EPROMs are 32 pins, while the IIgs ROMs are 28
pins.

This is probably easier than rigging up a circuit to use four 32KB
EPROMs, but the easiest option is to simply buy the ROM from Alltech
Electroncs, assuming that they can still supply them.

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