[B2-devel] Re: Basilisk II MacOS X addressing modes

[Nigel P. <ni...@in...>]

On Tuesday, July 2, 2002, at 08:19  AM, Adrian Taylor wrote:

> Hi,
>
> I was wondering if you could tell me whether it's possible to get 
> Basilisk
> II into 24-bit addressing mode. I have some *very* old ZBasic 
> programmes I
> want to run on a modern Mac, and they won't work with 32-bit addressing.
> When I try to turn off 32-bit addressing from the memory control panel, 
> the
> setting does not "stick".


	Hi Adrian. This is something I actually don't know a lot about,
so I have copied it to the developer's mailing list. The other guys
can correct my mistakes!


> I'm using a Quadra ROM with a 68030 Mac IIci settings, and System 7.5.3.

	I think that you have two problems here:

1) You are using a 32bit ROM, which will probably
    never allow you to boot in 24bit mode, and

2) The Mac OS X port of Basilisk II is built with an
    addressing mode that does not support 24bit emulation.
    (i.e. Direct Addressing, or Mode 2, in
http://iphcip1.physik.uni-mainz.de/~cbauer/BasiliskII/TECH
    )


	If you are able to get an older ROM, I can try to
build you a version of the Mac OS X port with virtual
addressing so that it can use 24bit mode.



> Is the source for the MacOS X port available anywhere, so I can 
> investigate
> myself?

	Certainly. An old tarball of my code is at my mac.com homepage,
and the latest version is in the Basilisk II CVS archive.

--
| Nigel Pearson, ni...@in...   | "Now the world has gone to 
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