From: nowhere@nevernet.at   
      
   On 04/09/2022 06:32, muta...@gmail.com wrote:   
   ...   
   > Although we can't change existing hardware, we can   
   > start by agreeing that Intel engineers missed   
   > some things that only came to light when   
   > pointed out by an obnoxious Australian, instead of   
   > dismissing everything he says in favor of   
   > professional infallible Americans.   
      
   in terms of costs and performance it was an absolute correct   
   solution at the time back then. [COP4..8080,8085,8086]   
   Improvements came with time anyway, we cannot alter history.   
      
   > After establishing that apparent truth we can   
   > discuss what options exist to compensate for American engineering failures.   
      
   > This includes the option of altering or   
   > replacing historical software.   
      
   you can only replace it. no way to modify old CPUs.   
      
   > Here's the PSP thing:   
   >   
   > https://groups.google.com/g/comp.os.msdos.programmer/c/ZvWGKqT   
   Fvc/m/skFPO1H3EAAJ   
      
   [quote]   
    > So:   
    >   
    > 05h = 9A   
    > 06/07 = FEF0   
    > 08h = 1D   
    > 09h = F0   
    >   
    > So the 06/07 "segment size" of nearly 64k is basically   
    > just maxing out the memory available to the .com   
    > program.   
    >   
    > But how does 9A + 1D + F0 translate into a call to 00C0?   
      
   you have this all wrong :):)   
   9A F0 FE 1D F0   is an absolute CALL FAR into a BIOS location   
   FEFO become IP and F01D became CS (could be a branch to 00C0)   
   __   
   wolfgang   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)