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Re: Do it yourself upgrade: IIgs ROM 01?

Subject: Re: Do it yourself upgrade: IIgs ROM 01?
From: ecitnerppa@aol.com (Ecitnerppa)
Date: 1998/03/20
Newsgroups: comp.sys.apple2
Organization: AOL http://www.aol.com
References: <350FF1BA.79BF@library.ucla.edu>

> 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). Can anyone help me?

I did this, I burned four 32K ones and "stacked them" with the exception of the
/CE lines, which I connected to a 74LS138. The '138 handles the additional
address lines that the 32K EPROMs don't have.

References:
- Re: Do it yourself upgrade: IIgs ROM 01?
  - From: pubpc@library.ucla.edu

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