How to backup Infocom's ZORK III game: *Insert DOS disk in drive A A>DISKCOPY A: B: <-- Ignore the errors on tracks 1-3! *Place your ZORK I or ZORK II disk in drive A and a blank disk in drive B. BE SURE THAT YOUR ORIGINAL IS WRITE-PROTECTED!!! A> *Now take out your ZORK disk and insert your DOS disk in A. A>DEBUG -R CS xxxx :0000 <-- you enter this -R DS xxxx :0040 -R IP xxxx :7C00 -R ES xxxx :0000 -L 0:7C00 0 0 8 -G =0:7C00 0:7C32 -G 0:7C44 <-- Don't take a shortcut here! -R ES xxxx :04C5 -G 0:7C46 -E 7C0:007C 02 08 -W 800:0000 1 8 8 -E 07C0:007C 03 04 -G 0:7C44 -R BX xxxx :0000 -G 0:7C46 -E 07C0:007C 02 08 -W 04C5:0000 1 10 8 -E 07C0:007C 03 04 -G 0:7C44 -R BX xxxx :0000 -E 07C0:007C 02 08 -W 04C5:0000 1 18 8 -E 0:7C41 B8 08 02 -W 0:7C00 1 0 8 -Q *This patch was done under DOS 1.1 - I haven't tried it under DOS 2.0 yet - which may cause unpredictable results... *Take out your new disk in drive B and write-protect it. It is now DISKCOPY-able. *Reboot your system - press ALT-CTRL-DEL.