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How to backup Infocom's Zork III. by Independent (IND)

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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 III disk in drive A and a blank disk in drive B.

A>
*Now take out your ZORK III 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 1
-G =0:7C00 0:7C2A
-R AX
xxxx
:0800
-G 0:7C63
-E 800:14E5 B8 08 02
-E 800:211A 02 08
-W 800:0000 1 8 18
-L 0:7C00 0 0 8
-E 0:7C7C 02 08
-E 0:7C41 B8 08 02
-W 0:7C00 1 0 8
-Q

*Take out your new disk in drive B and write-protect it.
 It is now DISKCOPY-able.
*Reboot your system - press ALT-CTRL-DEL.