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???
11/28/08 14:45
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 		 #160370 - still, why not
Responding to: ???'s previous message
Per Westermark said:
the 8088 [...] the 16-bit segment sizes [...]

You said it. Oh yes, complaints; on the other hand, zillions of programs living with this limitation quite well.

Also, quite a few of the high-end '51 derivatives do implement some scheme to extend the 64kB limit. Paging, sure; but there is some reason why do the manufacturers taking the pain, isn't it?

On the other hand, who said the RAM has to be attached to the external data bus and used as such?

Per Westermark said:
Having to start banking the variable accesses will quickly add complexity and have the user starting to fight with the compiler.


Who said the RAM is to be used to store *variables*, and a *compiler* is going to be used to allocate space in it?

I say, there ARE valid reasons to attach big storage to a '51.

JW


List of 35 messages in thread
TopicAuthorDate
Need bigger RAM            01/01/70 00:00      
   find out here            01/01/70 00:00      
   MCS-51 is the best            01/01/70 00:00      
      Not for BIG RAM!            01/01/70 00:00      
         why not?            01/01/70 00:00      
            Disagree            01/01/70 00:00      
            Address range does matter            01/01/70 00:00      
               still, why not            01/01/70 00:00      
                  while I agree with Per, here is a nugget for Jan            01/01/70 00:00      
                     Large data:: Yes, large RAM: Watch out            01/01/70 00:00      
                     particular application of OP, not yours, matters            01/01/70 00:00      
                        And the best is...            01/01/70 00:00      
                        but added complexity equals likely more buggy            01/01/70 00:00      
                  "best" is the key.            01/01/70 00:00      
                  Addressing modes do matter            01/01/70 00:00      
               Why would anyone use THAT architecture?            01/01/70 00:00      
                  Helps to check context before reacting            01/01/70 00:00      
                     It is the architecture and not the brand            01/01/70 00:00      
                        Sorry if unclear            01/01/70 00:00      
            Quick PC history            01/01/70 00:00      
               engineering insight            01/01/70 00:00      
                  What was your point?            01/01/70 00:00      
            Possible to 16Mbyte            01/01/70 00:00      
      I use MCS51            01/01/70 00:00      
         So why didn't you say that in the first place?            01/01/70 00:00      
            The universal truth again            01/01/70 00:00      
               64kB RAM?            01/01/70 00:00      
                  Both            01/01/70 00:00      
                     don't be deceived by Keil's database            01/01/70 00:00      
                        Good to know            01/01/70 00:00      
         '51 vs '52            01/01/70 00:00      
         even with AT89C2051 can be done            01/01/70 00:00      
   ... and the BIGGEST is...            01/01/70 00:00      
      Is that RAM on-chip?            01/01/70 00:00      
      Maybe biggest, but BEST?            01/01/70 00:00      

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