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Atari coding BBS
 
Re: Old Game Cracks
Posted by: Klaz Jun,20.2012-22:03 

Easy. :-)

They just modified the program file header after assembling the program.

GEMDOS will not load the entire *.PRG file into mem, but just the number of bytes that are specified for the TEXT and DATA segments in the program header (+ the relocation table, if there is one).

I have toyed with the idea of using this method for my patches - it's nice to have just one single file for all the data + loader code. However, I believe this may not be compatible with newer GEMDOS versions, or Mint etc.
Haven't checked this yet, though...





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Topic Posted by  Date 
Old Game Cracks Bod/STAX Jun,20.2012-21:23
  Re: Old Game Cracks Klaz Jun,20.2012-22:03
    Re: Old Game Cracks Bod/STAX Jun,20.2012-23:06
      Re: Old Game Cracks ggn Jun,20.2012-23:22
        Re: Old Game Cracks Pete Jun,21.2012-06:30
          Re: Old Game Cracks Bod/STAX Jun,21.2012-11:39
        Re: Old Game Cracks showaddywaddy Jun,22.2012-17:54
          Re: Old Game Cracks Bod/STAX Jun,22.2012-21:51
            Re: Old Game Cracks Bod/STAX Jun,23.2012-00:24
              Re: Old Game Cracks Bod/STAX Jun,23.2012-00:39
                Re: Old Game Cracks Bod/STAX Jun,23.2012-12:39
                  Re: Old Game Cracks ggn Jun,23.2012-21:59
                  Re: Old Game Cracks ggn Jun,23.2012-22:05
                    Re: Old Game Cracks Bod/STAX Jun,23.2012-23:48
                      Re: Old Game Cracks Bod/STAX Jun,23.2012-23:53
                        Re: Old Game Cracks ggn Jun,24.2012-00:11
                          Re: Old Game Cracks Bod/STAX Jun,24.2012-11:19
                            Re: Old Game Cracks Showaddywaddy Jun,24.2012-11:26
                              Re: Old Game Cracks Bod/STAX Jun,24.2012-12:00
                                Re: Old Game Cracks ggn Jun,24.2012-12:52
                                  Re: Old Game Cracks Showaddywaddy Jun,24.2012-13:31
                                    Re: Old Game Cracks defjam Jun,24.2012-17:25
                                      Re: Old Game Cracks Bod/STAX Jun,24.2012-18:04


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