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???
01/27/06 22:36
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 		 #108562 - Maybe you should use the 8155?
Responding to: ???'s previous message
If you're not using external RAM, you can probably get by with an 8155 or 8156. These have I/O, albeit of a somewhat different sort than the 8255, but since it internally demultiplexes the address/data information that appears on P0, you can get by with that. It also provides a bit of RAM, IIRC.

at that 4.9 MHz clock, you're going slowly enough for any technology that's been available since the invention of the mosfet.

RE



List of 55 messages in thread
TopicAuthorDate
please help me            01/01/70 00:00      
   Clock freq            01/01/70 00:00      
   Reset ?            01/01/70 00:00      
   please help me            01/01/70 00:00      
      Probe            01/01/70 00:00      
         8255 PROBLEM            01/01/70 00:00      
            Reset 8255            01/01/70 00:00      
   Memory Map            01/01/70 00:00      
   please help me            01/01/70 00:00      
      Scope            01/01/70 00:00      
         8255 address?            01/01/70 00:00      
   Memory Map part 2            01/01/70 00:00      
   isn't this fun            01/01/70 00:00      
      for once, I've got to agree            01/01/70 00:00      
         please help me            01/01/70 00:00      
            8255 - EXTERMINATE!!!!            01/01/70 00:00      
               Cool            01/01/70 00:00      
                  Some I/O expansion, some nostalgia            01/01/70 00:00      
                     Even Better 74xx573            01/01/70 00:00      
                        or - even better?            01/01/70 00:00      
               more easily said than done            01/01/70 00:00      
                  selling "haystacks" is criminal            01/01/70 00:00      
                     Huh?            01/01/70 00:00      
                        see ad in EE times            01/01/70 00:00      
                           Hobbyist            01/01/70 00:00      
                              max 7103            01/01/70 00:00      
                                 location            01/01/70 00:00      
                           $13? For what? What pitch, tolerance?            01/01/70 00:00      
                              He's English.            01/01/70 00:00      
                                 None, I hope            01/01/70 00:00      
                                    Reliable ?            01/01/70 00:00      
                                       Yes, I like 'em too ...            01/01/70 00:00      
                                          Never wire wrapped            01/01/70 00:00      
                                             You don't have to wire-wrap to benefit            01/01/70 00:00      
                              read the ad            01/01/70 00:00      
                  Atmel and Phillips            01/01/70 00:00      
            please help me, why on earth should we            01/01/70 00:00      
   please help me            01/01/70 00:00      
      for the Philips P89V51Rx2 and the P89C66            01/01/70 00:00      
         Atmel too            01/01/70 00:00      
            Are You Sure            01/01/70 00:00      
               Don't worry            01/01/70 00:00      
   Understand your system            01/01/70 00:00      
   please help me            01/01/70 00:00      
      Please don't answer            01/01/70 00:00      
         What is the clock of your system            01/01/70 00:00      
            Maybe you should use the 8155?            01/01/70 00:00      
               if it has to be some such thing, then by            01/01/70 00:00      
   Why?            01/01/70 00:00      
      never heard of 8155            01/01/70 00:00      
         well ... few of us have heard of it, but            01/01/70 00:00      
            RIOT            01/01/70 00:00      
               OK ... but that's not what the OP wants.            01/01/70 00:00      
                  There is one enormous difference between            01/01/70 00:00      
   Maybe this will help.            01/01/70 00:00      

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