Video Vegas (Baudville, 1985)

[toinet]

Play Poker, Keno and other interesting games with Baudville's program disk.

All programs are written in BASIC using Take 1 and its toolkit. Well-made, just like the protection


PROTECTION TYPE
It is a standard DOS 3.3 16-sector disk that can be copied with Locksmith but... there is a track synchro protection on the first eight tracks!


DISK COPY
Just launch Locksmith Fast disk backup and copy the disk. It won't boot...


PROTECTION REMOVAL
Launch your favorite disk editor and change the following data:

- T0/S6/1: 02 => 34
Instead of jumping to $E002 through the stack (real address $E003), we bypass the protection by calling $E034 (real address $E035)

- T0/S6/CD: 00 => 07 (not mandatory at all, just for fun)
That is the track index. As eight tracks are synchronized (0 to 7), we can put 7 here.

- T0/S6/3A: A5 2B => A9 60 (could be better)
Just force the slot to be 6...

Save the sector back to disk


Reboot and... enjoy,

Toinet

[toinet]

And now, the source code of the protection located at $E000. That page is located on track 0, sector 6.