i dont understand about what you mean by "12 bit"
anyway,
there are a lot of free disAssembler on the net
do some search with keyword "disAssembler"
these disAssembler convert machine lang-->assembley codes
i think there is specific port address espically for plug and play devices
at which these devices send infos to pc
I guess you may find what great infos if read something about i/o ports
if you asked about bootsector
you can create ordinary .com file
then rename it as *.bin
then writing it to bootsector
as follow
debug bootsect.com
w 100 0 0 1
you can also disamble it using debug
write
L 0 0 0 1
and
u0
you will get assembly code of bootsector
or
===
debug bootsect.com...
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