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???
03/31/09 22:33
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 		 #164090 - It was, at the time ...
Responding to: ???'s previous message
Neil Kurzman said:
The Modern X86 Is decades ahead of an 8052. The origional had a separate interrupt controller.

...but the original 8086 wasn't far ahead of the 805x. Both came out in the late '70's, IIRC.

As I recall the Z80 had a second set of registers that could be swapped in for an interrupt.. A similar concept.


One problem with the Z80 was that you had no flags or anything to tell you which register set you were currently using. There ways, though indirect, of dealing with that, but it was annoying.

Definitely the most interesting member of the x86 series, early on, was the i80186. It was almost a microcontroller, though it needed off-chip memory.

RE




List of 29 messages in thread
TopicAuthorDate
Register Bank Concept In 8051            01/01/70 00:00      
   Reg Banks            01/01/70 00:00      
      General??            01/01/70 00:00      
   Deja vu?            01/01/70 00:00      
      Compare ISR for 8051 with 8080            01/01/70 00:00      
      It's legacy from 8048            01/01/70 00:00      
         that just shifts the question...            01/01/70 00:00      
         "Legacy" is not necessarily bad            01/01/70 00:00      
   this is really about ....            01/01/70 00:00      
      Microprocessors respond quickly too            01/01/70 00:00      
         but will need a lot of pushes and pops            01/01/70 00:00      
            PUSHA and POPA            01/01/70 00:00      
         8086 not an X86            01/01/70 00:00      
            It was, at the time ...            01/01/70 00:00      
               80C186EB            01/01/70 00:00      
                  all???            01/01/70 00:00      
                     All 8031s            01/01/70 00:00      
                        verbiage            01/01/70 00:00      
                           Bad Grammar            01/01/70 00:00      
                              preposition 'in' required I feel            01/01/70 00:00      
                                 Good at            01/01/70 00:00      
                                    ok            01/01/70 00:00      
                                    Good with            01/01/70 00:00      
                                       Bad Grammer II            01/01/70 00:00      
                                          I'm very sorry to hear...            01/01/70 00:00      
                                          In the words of Professor Henry Higgins            01/01/70 00:00      
                                             do you have any ? :)            01/01/70 00:00      
                                                You're right ... those OLD books are all in Latin or Aramaic            01/01/70 00:00      
                                       Maybe...            01/01/70 00:00      

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