Keyworks (Troll associates, 1992)

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#984 - This is Keyworks: first keyboarding skills, another eduware to learn typing!

Disk structure
This is a nearly standard DOS 3.3 single-sided floppy disk.

Protection type
The disk cannot be copied. A further analysis with the bit editor of Copy II plus shows the usage of a DOS 3.3P protection type meaning that the data header relies on the value of the zero page address $31. A second protection lies in the address field where the first marker D5 is read twice so we have:
- address field: D5D5AA96
- data field: D5xxAD where xx depends on the file name loaded.

How to copy
Boot my copy disk and launch Advanced demuffin
Insert the original disk in D1
Press B to boot
Enter the monitor