Disk check to read sector 10 on track 39:

0bca:04c7 cd 13 -> f8 90
right before it is b0 01 b4 02

reads data into cs:0010
Then some sort of tamper-proof checking starts at 04d2:


:04f9
:0510
:053b
:0558 jne 0575 -> nop
right before it is 83 3e 80 04 01 cmp word ptr [0480],0001
:055f
0561

Lots of garbage code as misdirection :-)  Nice try, original dude.

-- Trixter