'V-Max secondary checks'
Author:Lord Crass (guest: search)
Date: Thu, Mar 31st, 2011 @ 01:04 ( . )

I accidentally analyzed the V-Max V1 version of this game, not the V0 version you were looking for.

Attached is the basics of the code for the V0 version.

Same old tricks. First block of protection code will check byte before data block sync, number of bytes in header, number of bytes in data block on all tracks from 17 down to 1. These checks pass fine.

Another block of code is uploaded to the drive and it scans from track 1 up to track 19 reading the header lengths using that cycle counting method, then averaging 8 values for the track. It stores the 19 values in a table and the C64 retrieves them and does some comparisons on them. Failure locks up the computer. This is the check that fails. The C64 code can be fixed up to pass this check. Not sure how to fix the actual header lengths in the image though, or if it's even possible.

Attachments:
1301547864_starrankboxing-vmax0.txt


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--* V-Max secondary checks
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