Fractions v3.1 (Peachtree Software, 1983)

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#1036 - Fractions by Peachtree Software is (c) 1983 by EduWare Services, Inc. That is the crack of v3.1 from November 1983. The disk label says 1980!

Disk structure
The disk seems to be a DOS 3.3 single-sided disk. When one boots it, the sound is familiar. An analysis with Locksmith Fast Disk Backup shows that the disk is on-disk protected.

Protection type
An analysis with the bitcopier of Copy II + shows that the protection lies in a change of the epilog markers of the:
- address field: D5AA96 FFFF (instead of DEAA)
- data field: D5AAAD FFFF (from DEAA)
A further analysis shows a change in the nibble translation table where index 0 of value 96 is changed to value AA for sectors above the RWTS.

How to copy
Boot a DOS 3.3 system master and INIT EDU-WARE,D2
Then boot my copy disk, launch Advanced Demuffin 1.4
Press P to bypass boot
Enter the monitor
B930:18 60 EA
B98B:18 60 EA
BA29:AA
Press ctrl-Y to return
Copy T3/S0 to T22/SF
We will skip the current DOS version

How to crack
With the replacement of the ugly DOS 3.3 of the original disk, we have saved us a lot of changes to the original RWTS. Now, everything is good and works well

The disk image is available at http://www.brutaldeluxe.fr/crack/

Reboot and... enjoy,

LoGo
7/2020