Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!samsung!uunet!unisoft!mtxinu!taniwha!paul
From: paul@taniwha.UUCP (Paul Campbell)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Radius Rocket & Sys 7 question
Keywords: Radius, Rocket, System 7, 32-bit clean, Mac-II, MCL, Lisp
Message-ID: <883@taniwha.UUCP>
Date: 28 Jun 91 17:31:46 GMT
References: <343@hsvaic.boeing.com> <1481@radius.com>
Reply-To: paul@taniwha.UUCP (Paul Campbell)
Organization: Taniwha Systems Design, Oakland
Lines: 29

In article <1481@radius.com> johnL@radius.com (John Lee) writes:
>
>First, the Rocket is not compatible with Rev A Mac ][ ROMs.  This is due to a 
>well-known bug in the Apple ROM which was corrected in January 1980 on the Rev 
>B ROM set.  The bug doesn't allow access to addresses above 1MB per NuBus slot.

No - it's only a bug in the slot manager the II is quite capable of accessing
more than 1Mb/slot

>Next, Macs of the ][cx variety and older inherently are not able to go into 32-
>bit addressing mode and are stuck with 24-bit addressing.  Rocket does not 
>change this fact as it uses the code in the motherboard's ROMs.

of course they can - your company sells large screen boards that sit in
NuBus slots and have 4Mb of framestore - they do work on Mac IIs don't
they? A/UX runs in 32-bit mode on my II ......

The problem is not that the hardware inherently can't work in 32-bit mode
but that the memory manager in those systems can't - hence the need for
MODE32 or a ROM upgrade from Apple


	Paul

-- 
Paul Campbell    UUCP: ..!mtxinu!taniwha!paul     AppleLink: CAMPBELL.P

Tom Metzger's White Ayrian Resistance has been enjoined to stop selling Nazi
Bart Simpson t-shirts - Tom of course got it wrong, Bart is yellow, not white.