From: msmcdoug@no.spam.iinet   
      
   David Librik wrote:   
      
   > I know IDA has a "Z-80 mode," but surely it would also need a module to   
   > understand the structure of /CMD files before you could use it on TRS-80   
   > programs?  I have an old copy of IDA Pro but I never could see how to   
   > use it to reverse-engineer Big Five games.   
      
   Most TRS-80 programs (games!) load completely into memory without overlays   
   etc, so what I do is load the file into memory in say, a debug version of   
   MESS, and then dump the appropriate memory address range to a file and load   
   that binary into IDA.   
      
   The other thing I tried just the other night with HEADON/CMD (hi turnkit!)   
   was use the CMDDUMP program written by Tim Mann to extract a raw binary from   
   a CMD file. That initially *appeared* OK, but after starting to disassemble   
   it, it became apparent that later addresses had been shifted by one or more   
   bytes!!! Weird! The game ran OK in an emulator, so I was in the process of   
   transferring it to a disk image I could dump in MESS - I suspect a bug in   
   CMDDUMP??? When I get the chance I'll confirm...   
      
   Regards,   
      
   --   
   |              Mark McDougall                | "Electrical Engineers do it   
   |     |   with less resistance!"   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)