B) The code can now be decrypted by typing G 0C5F. Again, the
screen will turn black. After a few seconds, reset the
computer and reactivate the monitor with SYS 49152. Using the
MEMORY command (M 0A97), change the code at $0A97 from 8D B5
0A to EA EA EA. Change the code at $0AB5 from AC to 00.
C) Now that our changes are in memory, we may re-encrypt the
file (and our byte changes) by again typing G 0C5F. Again
reset out and SYS the monitor back in with SYS 49152 and hit
RETURN. Examine memory at $0A97 and find the encrypted byte
changes. They should be 7E D1 08. The byte at $0AB5 has
changed to 26. Now we know the changes, and the location so
we may now do the actual changes to the backup.
D) Reset the computer and load the sector editor from the
utility disk <> LOAD"DISK DR",8,1 <>. When the cursor
appears, type RUN and hit RETURN. Remove the utility disk and
place your backup in the drive. Hit RETURN. You will be shown
track 18, sector 1. By placing the cursor at position 35, you
will be on the file pointers of the 1985 file. Press the J
key to jump to the beginning of the 1985 file. When the
sector comes on the screen, examine the first four bytes. The
first two are links to the next sector of the file. The next
two are the address bytes in reverse order ($0A00). We know
our changes are in memory block $0A00 so we are in the proper
block to make our changes. This block turned out to be track
17, sector 4 on our version. Yours could be in a different
location on the disk, but the idea will be the same.
E) Using the cursor key to move through the code, we find the
original three bytes 19 8E E8 at location 155. The change to
7E D1 08 can be accomplished with the @ key. The changes must
be the decimal equivalent. These are 126 209 08. Change each
byte by placing the cursor over the byte to be changed, and
type @ and the decimal number change. Hit RETURN when the
change is made to lock it in. When all three bytes are
changed, continue searching with the cursor for the 8A byte.
This can be found at position 185. Using the same change
procedure, change it to a decimal 38 ($26). When all changes
have been made and locked in, press C to copy the sector back
to the disk.
You now have a copy that can be fast copied. The placement of
data on the disk in methods other than directory files will not
allow you to file copy. One other point of interest is the fast
loader installed in many pieces of this publisher's software.
This fast loader is NOT compatible with the 1571 disk drive. In
many (but not all) of the programs, you may disable the fast loader
and allow the program to load on the 1571 by changing the jump to
the main program in the autoboot. Fireworks Kit will work by doing
K.J. REVEALED TRILOGY PAGE [29] (C)1990 K.J.P.B.
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