I have a 2011 Macbook Pro and I spent a lot of time trying
to get it to boot Freedos as a precursor to booting PDOS,
but it refuses to recognize the USB stick (hard disk image)
as bootable, despite the fact that it is supposed to
support legacy boot/BIOS to some degree.
I would like to know what the Macbook is looking for. I
don't care (at this stage) if PDOS doesn't work, I just want
it to be recognized as bootable.
I would like to know what the minimal changes are required
to my disk image to see some action. My disk image is here:
http://pdos.orgI'm wondering whether zapping 80 to EE and maybe zapping
a legacy boot flag will get some action. I don't care if my
disk is trashed etc. I continually reburn the USB stick anyway.
Any idea what the situation is?
I'm not interested in running any tools/Bootcamp etc. I only
want to run my own "zap" program to change on byte at a
time on my image.
Note that after a lot of experimentation and research I
stumbled across the suggestion that the Mac uses a "hybrid
MBR" which I had never heard of. But that doesn't answer
my specific question of which bytes exactly the Macbook
is looking for. Not x'aa55' signatures presumably.
Thanks. Paul.