🚀 go-pugleaf

On 10 Apr 90 21:49:06 GMT, danbabcock@eklektik.UUCP (/dev/ph1) said:

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

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

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

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

danbabcock> Does this look familiar (grin)?

It looks sort of like the code for the ColdStart vector...  or are you
alluding to something else?

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

I'll second this.  It is an excellent tool -- not a simple
disassembly, but a highly commented one.  And data is not
disassembled.  It was well done, and is well worth getting.

[I'll leave the address in.]

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

-- 
Deven T. Corzine        Internet:  deven@rpi.edu, shadow@pawl.rpi.edu
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Simple things should be simple and complex things should be possible.