cc4c6775   
   From: tlake@twcny.rr.com   
      
   "Blake Patterson"  wrote in message   
   news:a530aace-65e1-4a4e-8a9b-031a457e30a0@b1g2000hsg.googlegroups.com...   
   > Will Model I software execute, unmodified, on a Model III (or 4)?   
   >   
   > Are the display capabilities between the Model I and Model III   
   > identical (assuming no graphics board has been added)?   
      
   Much of it will.  Some differences are that the Model I used   
   memory mapping to access some devices while that was changed   
   to use I/O ports on the Model III.  There are some differences in the   
   character sets also so some programs designed on the Mod I won't   
   display properly on the Mod III.  One example is the up arrow on the   
   Mod I displays as a square bracket on the Mod III.  If you created   
   a direction rose on the Mod I it will look strange on the Mod III.   
   Radio Shack's Casino Games and Invasion Force were affected by this.   
   This is purely a cosmetic difference, however.  The program won't be   
   affected by it.   
   Also, the Model III has more ROM than the Model I (I believe it's 14K   
   as opposed to 12K on a Mod I) so if your program depends on certain   
   locations in low memory to be free it may not work on the Mod III.   
      
   Tom Lake   
      
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