http://hxc2001.com/disks_analysis/vrac/ ... 89_scp.png
Very interesting. What is the meaning of the two different green colors for sectors?
I have looked at the high resolution picture and it seems you are not detecting the "strange ID" located at end of track 1.
Here is a very high res portion of the image with this ID field
This is a very special case. Normally the WD1772 only detect ID with exactly 3 sync marks. But 7 sync marks is a special case: after the first 3 sync marks the FDC expect an IAM but receive another sync mark so it immediately return to the sync search sequence and the next 3 sync marks followed by an IAM are corretly interpreted by the WD1772 as the start of an IAM
Here is the content of the buffer
But even more amazing this ID is placed on top of a "fuzzy area" (just after the $FF)
so if you read again (e.g. revolution 2) you get different content
Does not seems to be used as a protection for the game (obviously STX does not support this) but certainly not a coincidence!