From: gp2k00@gmail.com   
      
   On Thursday, July 18, 2013 11:49:38 PM UTC-7, Al Petrofsky wrote:   
   > George Phillips  writes:   
   >   
   > > I've got a DT-1.  But looking into the tech. specs I see that it has   
   >   
   > > some kind of embedded processor with the program burned into it.   
   >   
   > > Reading that ROM would require some serious work (chip decapping and   
   >   
   > > reading the ROM visually).   
   >   
   >   
   >   
   > It's not quite as bad as that.  If you apply the appropriate inputs at   
   >   
   > the appropriate times, an 8051 will dump its ROM out through port 0.   
   >   
   > You could do this using a genuine Intel UPP-103 programmer with the   
   >   
   > UPP-851 personality card, and I suppose there may be other generic ROM   
   >   
   > readers out there that could be coaxed into doing the job.  Worst   
   >   
   > case, you could use the information about program verification in the   
   >   
   > 8051 documentation to build your own 8051-reading device.   
   >   
   >   
   >   
   > See pages 2-17 and 2-18 of "MCS-51 Family of Single Chip Microcomputers   
   >   
   > User's Manual" (Intel, 1981).   
      
   Hey, that's good news.  Looks like it acts pretty much like a plain-old ROM in   
   that mode.  Having dumped some character ROMs with my Arduino MEGA, it should   
   be easy enough to dump the 8051 ROM.  Another little project for a rainy   
   weekend.   
      
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