Xref: utzoo comp.sys.amiga:63494 comp.sys.amiga.hardware:2991 comp.sys.amiga.tech:13905
Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!mailrus!uunet!cbmvax!cbmehq!babylon!rbabel
From: rbabel@babylon.UUCP (Ralph Babel)
Newsgroups: comp.sys.amiga,comp.sys.amiga.hardware,comp.sys.amiga.tech
Subject: Re: GVP 68030 board hardware bug
Message-ID: <02961.AA02961@babylon.UUCP>
Date: 10 Aug 90 18:28:11 GMT
Followup-To: comp.sys.amiga.tech
Lines: 27

In article <12896.26af1d23@qut.edu.au>
inb300campbe@qut.edu.au (David Campbell) writes:

> Problem: When writing a word to memory located in 32-bit
> wide memory and with an address ending in 3,7,B or F, the
> first byte is always written correctly, but the second
> byte of the word (LSB) is NOT written to the correct
> location.

Known bug, has already been fixed.

> Because no memory transfers or word data is transferred to
> odd addresses using a 68000 CPU, all programs written for
> the 68000 will run okay even with this problem. However
> programs written for the 68020/030 CPU's which don't use
> word alligned data will not work properly on these
> machines.

Even though the '020 and '030 _can_ read word data from odd
addresses, it is in fact unlikely that a properly written
Amiga program makes actually use of this feature. I admit
that it _might_ be useful in a few cases, but it's unlikely.
If your GVP '030 board exhibits this behaviour and this
seems to cause any problems, you might want to call GVP and
request a new PAL (U50, I think) that fixes this problem.

Ralph