Hello, all!
i have an old box ( 128MB RAM, 13GB HDD, DOS + Win98 - and that is after
several upgrades :-) )
it has a DOS program, that can maybe never be used, but need to be kept
the program is copy-protected: is "attached" to last 16 bytes of BIOS,
those F000:FFF0 to :FFFF
the rest of BIOS is not to be the key, but "BIOS creation date"
definitely is.
Can this be reproduced in VirtualBox or VMLite ?
I mean that part of "stock" BIOS been replaced by pre-given data and, if
possible, write-protected like BIOS on real hardware is ?
// BTW, it does have some LPT port with key as well, but that's a
different story, i hope :-)
i do not need the whole BIOS. only a little part.
last 16 bytes are reserved for
1) 5-bytes JMP FAR command, for CPU cold-start
2) the rest is BIOS creation date and is not code. I don't remember if
in
plain text or BCD or something.
Both these can be harmlessly patched, after virtual machine CPU
kick-started.
But that may require some plugins creation (if there is proper API) or
even some source patching, creating API/settings.
So, since you have knowledge of internals of VBox, i think u maybe can
say.
--
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