💾 Archived View for mirrors.apple2.org.za › archive › apple.cabi.net › FAQs.and.INFO › IIGS.SPEC.INF… captured on 2023-01-29 at 07:50:39.
-=-=-=-=-=-=-
Path: news1.icaen!news.uiowa.edu!news2.chicago.iagnet.net!qual.net!iagnet.net!nyd.news.ans.net!newsfeeds.ans.net!news.idt.net!ix.netcom.com!news
From: Tomasz Beben <tbeben@ix.netcom.com>
Newsgroups: comp.sys.apple2
Subject: Re: Memory Card???
Date: Wed, 29 Apr 1998 23:03:28 GMT
Organization: Netcom
Lines: 48
Message-ID: <6i8bps$c78@dfw-ixnews7.ix.netcom.com>
References: <3545F067.8B34A0C6@WEHATESPAMcnf.com> <1d89u2q.rq0ag41kopdmlN@dempson.actrix.gen.nz> <35473A40.FEDCA8BD@WEHATESPAMcnf.com>
NNTP-Posting-Host: irv-ca55-30.ix.netcom.com
X-NETCOM-Date: Wed Apr 29 6:06:36 PM CDT 1998
X-Newsreader: NETCOMplete/4.0
Xref: news1.icaen comp.sys.apple2:133143
In article <35473A40.FEDCA8BD@WEHATESPAMcnf.com>,
Matt Willman <Willman.Matt@WEHATESPAMcnf.com> wrote:
>Thanks for all the info everybody...I'm happy to find out that it most
likely
>wasn't some flaky hardware. I have one more question about the ROM 0 to
ROM 1
>upgrade though. I only replaced the ROM chip itself, and I have heard
that in
>some ROM 0 machines you have to replace the VGC also. Can you test the
VGC to
>see if it needs to be upgraded, or???
You can tell which ones need to be replaced by the serial numbers. Here is
an excerpt from an apple document which describes this:
To determine if you need either the VGC or ROM upgrade, check the first
three
digits of the serial number on the bottom of your IIgs and use the chart
below
to determine what upgrade, if any is required:
Units with numbers 704 or lower require both the new VGC and ROM
Units with numbers 705 - 724 (inclusive) require only the new ROM
Units with numbers 725 or higher do NOT require any upgrade
However, since some systems may have had logic board swaps since date of
purchase, it is useful to to check the individual VGC and ROM numbers on
the
main logic board to insure that an upgrade is indeed required. Please
refer to
the chart below:
_________________________________________________________________________
_____
Old ROM: ends in "A" New Replacement ROM: ends in "B"
_________________________________________________________________________
_____
Defective VGC's: AMI 344SOO46-1 Good VGC's: AMI 344SOO46-2
AMI 344SOO46-A AMI 344SOO46-B
Replacement VGC numbers are: AMI 344SOO46-3
IMP 344SOO46
IMP 344S0056
Hope this helps, usually this stuff can be found in apple's technical
reference library on the net.