Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uunet!nfsun!eklektik!danbabcock
From: danbabcock@eklektik.UUCP (/dev/ph1)
Newsgroups: comp.sys.amiga.tech
Subject: Amiga 1000 boot ROMs
Message-ID: <1733@eklektik.UUCP>
Date: 10 Apr 90 21:49:06 GMT
Reply-To: danbabcock@eklektik.UUCP (/dev/ph1)
Organization: Computers, Gerbils, and Games in the Basement, Pgh, PA
Lines: 40

Markus Wandel wrote in <23080@watdragon.waterloo.edu>:
(some stuff deleted for brevity)

> How do you kickstart an A1000 off something other than its internal floppy
> drive?  The reason I ask is that a hard disk interface made by Comspec
> for the A1000 actually kickstarted off the hard disk, so it must be possible.

There is indeed a hook in the A1000 boot ROMs. Here it is:

(note that a few trivial things are done before this)
cmpi.w #$1111,$f00000
bne.s continue
move.w #$fff,$dff180
lea $f800ee,a5 ;return address
move.l $f00004,a0
jmp (a0)
continue:

Does this look familiar (grin)?

> I'm aware that a commented disassembly of the A1000 boot ROM exists
> and has been published, but I've never seen it.

I have it! It's part of a book called "Dr. Ruprecht's Kommentiertes
ROM Listing". The book also includes an Exec disassembly (not nearly as
good as yours!). The boot ROM is 8K, so the listing is rather long.
If you'd like, I'll mail the book to you, you can extract whatever info
you want, and mail it back when you're finished.

Lastly, I'd like to publicly thank you for your *brilliant* Exec
disassembly. If someone on the net doesn't have this, download it
immediately! Othwewise, you're just spinning your wheels when it comes
to untangling knotty Exec programming issues. Markus Wandel has done
more for the Amiga community than anyone I can think of. Thanks!!!

> Markus Wandel
> mwandel@tiger.waterloo.edu
> (519) 884-9547

-- Dan Babcock / voice (412)-373-1753