Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!wuarchive!usc!apple!Apple.COM!lsr
From: lsr@Apple.COM (Larry Rosenstein)
Newsgroups: comp.sys.mac.programmer
Subject: Re: HELP! ID=01 on a Mac II
Message-ID: <5424@internal.Apple.COM>
Date: 27 Nov 89 21:34:50 GMT
References: <1989Nov24.035604.27499@agate.berkeley.edu>
Sender: usenet@Apple.COM
Organization: Objects-R-Us,  Apple Computer, Inc.
Lines: 21

In article <1989Nov24.035604.27499@agate.berkeley.edu> 
silverio@brahms.berkeley.edu (C J Silverio) writes:
> My pal says "dollars to doughnuts it's an alignment problem." OK,
> cool, pretty easy to fix, right?

ID=01 is a Bus Error, which means you tried to access a non-existent 
address.  It is impossible to get a Bus Error on a Mac Plus or SE, because 
the hardware wraps around addresses.  On a Mac II, if you try to access 
the addresses assigned to a NuBus slot and no card exists there, you will 
be a Bus Error.

An alignment problem, as you refer to it, would be an address error which 
is ID=02.  On a 68000 yo ucan get an address error if you try to do a word 
or long operation but use an odd address. The 68020 can handle this case, 
however, at a cost in speed.

Larry Rosenstein, Apple Computer, Inc.
Object Specialist

Internet: lsr@Apple.com   UUCP: {nsc, sun}!apple!lsr
AppleLink: Rosenstein1