Re: Prince of Persia Copy Protection

[jmk3@crux5.cit.cornell.edu (Jay Krell)]

 >I do question
 >Br0derbund's usage of a quarter track in Prince of Persia.  I, too,
 >received the program as a gift (I still fell that it kills IBM
 >P.O.P.(not 2) w/o a SoundBlaster) and I immediately set out to make my
 >legal backup.  At least in version 1.0 (press CTRL-V during game play
 >to check) there _IS NO_ quarter-track.  You can tell quarter-tracks
 >with true Apple Disk II drives.  You can hear a slight tick
 
I don't remember if I saw quarter tracking, but my 5.25" copy of POP used the
18 sector format. Anyway, at least back then, you could send in the 5.25" disk
and ask for a 3.5" copy, which is easy to copy:
 
Prince of Persia 3.5" deprotect:
 
Block: 7
Byte: $16
From: $90 (bcc)
To: $80 (bra)
 
Block: $A
Byte: $8C
From: $18 (clc)
To: $38 (sec)
 
This is to be used for archival purposes only.
 
POP is indeed a great game with great graphics. Despite the 128K requirement
and InCider's comment otherwise, it is just single hi-res. So is Wings of Fury
if I remember right. I wish I had 3.5" version of that great game.
(Enable the Visit Monitor CDA and use it to clear the hi-res screen while
playing.)

--
  --Jay, jay.krell@cornell.edu