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???
02/05/07 19:42
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 		 #132082 - programmer + system
Responding to: ???'s previous message

WHAT are you doing with the PSEN ? it should go diretly to the program memory chip.

That is normal, BUT I want to program the EEPROM on board using the parallel port, without having to remove it. Since a logic low from PSEN indicates that the CPU wants to read external data, I'm going to also use this line to enable parallel port input and have the data from it program the EEPROM, simply by issuing code to it.

List of 45 messages in thread
TopicAuthorDate
CMOS?            01/01/70 00:00      
   74HC and 74HCT IS CMOS!            01/01/70 00:00      
      yes            01/01/70 00:00      
         a datasheet and a calculator            01/01/70 00:00      
   Why do you want to "process the PSEN signal" I kno            01/01/70 00:00      
      You need to stick your nose in the books, Mike            01/01/70 00:00      
         umm.            01/01/70 00:00      
            WHAT are you doing with the PSEN ?            01/01/70 00:00      
               programmer + system            01/01/70 00:00      
                  80C51BH doesn't have EPROM            01/01/70 00:00      
                     He's using it as an 80C31            01/01/70 00:00      
                     im meant            01/01/70 00:00      
                  Ambiguous            01/01/70 00:00      
                     LPT            01/01/70 00:00      
                        Is it T0 and T1, or T1 and T2?            01/01/70 00:00      
                           T0 and T1 and, for a '52 T2            01/01/70 00:00      
            What do you mean \"ummm\"            01/01/70 00:00      
               welcome to "Trying"            01/01/70 00:00      
                  nobody thinks you're stupid, however ...            01/01/70 00:00      
                     answer.            01/01/70 00:00      
                        why screw with the clock?            01/01/70 00:00      
                           stop trying to make deals!            01/01/70 00:00      
                              not necessarily            01/01/70 00:00      
                                 ok            01/01/70 00:00      
                                    sorry, I goofed            01/01/70 00:00      
                              Because...            01/01/70 00:00      
                                 Yes, but will it work? It's ATMEL ... (yechhh!)            01/01/70 00:00      
                                 Just to play it safe            01/01/70 00:00      
                                    or try the Maxim/DALLAS parts ...            01/01/70 00:00      
                                       BINGO            01/01/70 00:00      
                                       Not a good first chip            01/01/70 00:00      
                                          What's his primary purpose            01/01/70 00:00      
                                       Mike - FREE CHIP            01/01/70 00:00      
                        An easier way?            01/01/70 00:00      
                           if he is to get another chip, then            01/01/70 00:00      
                              Harder than it needs to be            01/01/70 00:00      
                                 Let him do what he wants! He'll learn something.            01/01/70 00:00      
                                    a small correction            01/01/70 00:00      
                                       Well, I wouldn't know ... I don't use ATMEL            01/01/70 00:00      
                                    answers....            01/01/70 00:00      
                                       TOTALLY and ABSOLUTELY incorrect. if "the flash            01/01/70 00:00      
                                          .            01/01/70 00:00      
                                             Mike ,,, there are other problems ...            01/01/70 00:00      
                        There may be some surprises ...            01/01/70 00:00      
               two Timers            01/01/70 00:00      

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