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   comp.sys.raspberry-pi      Raspberry Pi computers & related hardwar      26,127 messages   

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   Message 25,187 of 26,127   
   The Natural Philosopher to All   
   Re: OT: horrible 8086 segmentation   
   27 Nov 24 11:40:07   
   
   From: tnp@invalid.invalid   
      
   On 26/11/2024 17:37, Josef Möllers wrote:   
   > On 25.11.24 18:33, mm0fmf wrote:   
   > [...]   
   >   
   >> e.g.   
   >> "   
   >>      // start of barrel   
   >>      EventRec far* searchp = (EventRec far*) work.bufs;   
   >>   
   >> "   
   >>   
   >>   
   >> My eyes! My eyes! That was COMPACT model code, so 64k of code and 1MB   
   >> of data, code addresses were 16bit offsets to the CS reg and data was   
   >> far so 32 bits of segment and offset of DS or ES. And of course you   
   >> had to be extra careful of any pointer arithmetic as a far pointer   
   >> wrapped after 64k. You had to use slower HUGE pointers to get   
   >> automatic normalisation. God it was shit.   
   >>   
   >   
   > And to consider that, at that time, processors like MC68000 or NS32016   
   > were readily available.   
   >   
   Backwards compatibility.   
   DOS came from 8080 based CP/M , to run on an 8086, to where 8 bit code   
   could be easily ported.   
      
   And so we were stick with that architecture.   
      
   A prime example off 'mass marketing always wins over excellence'   
      
   and   
   'nothing succeeds like success'   
      
      
      
   --   
   Labour - a bunch of rich people convincing poor people to vote for rich   
   people by telling poor people that "other" rich people are the reason   
   they are poor.   
      
   Peter Thompson   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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