Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!umd5!purdue!decwrl!pyramid!voder!apple!kateley
From: kateley@Apple.COM (Jim Kateley)
Newsgroups: comp.sys.mac
Subject: Re: Mac II ROM upgrade
Message-ID: <8759@apple.Apple.Com>
Date: 21 Apr 88 23:36:26 GMT
References: <2196@rti.UUCP>
Reply-To: kateley@apple.UUCP (Jim Kateley)
Organization: Apple Computer Inc, Cupertino, CA
Lines: 39

In article <2196@rti.UUCP> rcb@rti.UUCP (Randy Buckland) writes:
>I have found out that this upgrade exists and is primarily to
>allow the use of NuBus cards with more than 1MB of memory.
>
>The upgrade appears to be a swap of the logic board for a rev
>B logic board. Does anyone out there have any details on 
>what the differences really are? I have conflicting reports

The MacII logic board upgrade does two (and only two) things:

It fixes a ROM bug so you can can have more than
1MB of address space on a NuBus card.

It changes a HAL that caused a slight timing problem between
NuBus cards that can become bus master.

You would need this upgrade if:

You have a NuBus card that needs more than 1MB of address space
You have NuBus card(s) that can become bus master.

You do NOT need this upgrade if:

You are running A/UX (If you don't believe me, I have two machines
doing it, and I don't know how to tell them the bad news.... :-))
You are using an Apple Video card or Ethertalk interface card 
(neither of them can become bus master).

The only NuBus card I know of (to date) that needs this upgrade 
is the National Semiconductor RAM board.

This board will NOT

Make your disk access twice as fast.

-- 
Jim Kateley          UUCP: {sun, voder, nsc, mtxinu, dual}!apple!kateley
S,P,HnS!             DOMAIN: kateley@apple.COM  Applelink: kateley1
Disclaimer:   What I say, think, or smell does not reflect any policy or
	      stray thought by Apple Computer, Inc.