🚀 go-pugleaf

I'm trying to make a boot sector program that requests a password from the
user, and refuses to boot if the correct password is not corrected.

I've figured out this:
-  I'll save the original boot sector at the last physical sector on the
   disk.  Caveat: When I looked at this sector with DiskEdit I noticed
   some 'debris' from an earlier FORM-virus attack.  How can I pick a safe
   sector?  I thought about marking an unused sector bad, and use that...
   thoughts?
-  My boot program will relocate itself to 07c0h:0200h, that is, making
   room for loading the original boot sector, which must be put at
   07c0h:0000h.  Any hints on how to accomplish this?
-  I also want the harddisk to be unaccessible when the PC is booted with
   a DOS diskette in drive A:.  I guess I will have to modify one/some of
   the values in the drive parameter table at the start of the boot sector
   program, but which value(s)?
-  When a boot has been successfully accomplished on C:, I need to put
   back the 'bad values' sometime, to make the HD unaccessible at next
   boot-up.  A device driver in CONFIG.SYS sounds good enough.  Ideas?

If I ever finish this, I'll probably put it in the public domain, for you
guys to pick from ftp's and bbs'es.

Please reply via e-mail, it's easy to miss posts in News.

-- 
Cheers from Robert Schmidt, aka Ztiff Zox, aka Buuud (IRC).  E-mail to 
robert@solan.unit.no, snail-mail to Stud.techn. Robert Schmidt, Stud.post 170,
Norwegian Institute of Technology, 7034 Trondheim, NORWAY          

Warlords: Now do you think my .sig is boring enough?