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???
01/10/08 16:31
Modified:
  01/10/08 16:35
Read: times


 		 #149238 - Maybe ... nope
Responding to: ???'s previous message
The bible said:
DA A adjusts the eight-bit value in the Accumulator resulting from the earlier addition of two variable

Erik said:
could this be it?

Maybe ...

... a few minutes pass ...

Nope. I just tried setting up PSW and ACC with an ADD instead of the two MOVs. Got the same result ... DA A didn't change the accumulator.

(Actually, I would have been really, really, really surprised if the processor tries to keep track of the instructions that precede the DA A. But anything is possible, I guess.)

-- Russ


List of 34 messages in thread
TopicAuthorDate
DAA Misunderstanding            01/01/70 00:00      
   could this be it?            01/01/70 00:00      
      Maybe ... nope            01/01/70 00:00      
   a double negative ???            01/01/70 00:00      
      ... or an exclusive OR            01/01/70 00:00      
      Case 4            01/01/70 00:00      
         Are there don't-care situations?            01/01/70 00:00      
            I think this is the case            01/01/70 00:00      
               Not quite ...            01/01/70 00:00      
                  no            01/01/70 00:00      
            True to bible            01/01/70 00:00      
   e-mail to SILabs sent just now            01/01/70 00:00      
   Operands must consist of two packed BCD digits!            01/01/70 00:00      
      OK, but what does a packed 07 look like            01/01/70 00:00      
         Correct            01/01/70 00:00      
            if case 4 is a biblical catastrophe            01/01/70 00:00      
               Not true            01/01/70 00:00      
                  more to this            01/01/70 00:00      
                     Same as Case 1            01/01/70 00:00      
   reply from SILabs            01/01/70 00:00      
      I'm happy now            01/01/70 00:00      
      I am willing to try...            01/01/70 00:00      
         DA A test program            01/01/70 00:00      
            the results...            01/01/70 00:00      
               DS89C450 is strictly "biblical", too...            01/01/70 00:00      
                  The DAA instruction is so specific...            01/01/70 00:00      
                     point of view            01/01/70 00:00      
                        Agreed!            01/01/70 00:00      
               the last hope gone... XC866 is DAA-biblical too            01/01/70 00:00      
                  no "pick and choose" eitherThe Bible or "the bible            01/01/70 00:00      
                     don't take it too literally, please...            01/01/70 00:00      
      DAA on other Architectures            01/01/70 00:00      
         this is how it happened            01/01/70 00:00      
         Thanks for the link!            01/01/70 00:00      

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