DOS ain't dead - IRQ ISR IDT [5] RM ISR vs PM ISR

IRQ ISR IDT [5] RM ISR vs PM ISR (DOSX)

posted by Rugxulo , Usono, 22.08.2007, 00:13

> > Really? I never heard that, only heard that PPro was bad at 16-bit stuff
> > (vs. Pentium 1), eventually corrected in PII or whatever. Got any
> online
> > references to point us to regarding that?
>
> Since memory writes for 80386+ are always done in DWORD chunks, there's
> indeed a - small - benefit for 32-bit software using a properly aligned
> 32bit stack and DWORD variables. However, I doubt that this is significant
> for the case we are talking about in this thread.

I'm sure you're more knowledgable than me in pretty much every way, but I heard that a 386 Sx had a 16-bit external data bus vs. 386 DX and all 486s (even Sx) which have a 32-bit one. And the Pentium has a 64-bit one, last I heard. Plus, the original IBM PC was an 8088 and had an 8-bit one (vs. the 8086's 16-bit one, twice as fast).

Please feel free to correct or add any info to this! :-)

---
Know your limits.h

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Complete thread:

IRQ ISR IDT - DOS386, 13.08.2007, 07:05 (DOSX)
- IRQ ISR IDT - Japheth, 13.08.2007, 08:18
  - IRQ ISR IDT [2] - DOS386, 13.08.2007, 08:34
    - IRQ ISR IDT [2] - Japheth, 14.08.2007, 22:24
      - IRQ ISR IDT [3] Very weeeird results - DOS386, 16.08.2007, 10:28
        IRQ ISR IDT [3] Very weeeird results - Japheth, 16.08.2007, 14:24
        IRQ ISR IDT [4] Missed the point - DOS386, 17.08.2007, 00:58
        IRQ ISR IDT [4] Missed the point - Japheth, 17.08.2007, 10:50
        IRQ ISR IDT [5] RM ISR vs PM ISR - DOS386, 19.08.2007, 07:46
        IRQ ISR IDT [5] RM ISR vs PM ISR - Rugxulo, 21.08.2007, 03:16
        IRQ ISR IDT [5] RM ISR vs PM ISR - Japheth, 21.08.2007, 08:28
        IRQ ISR IDT [5] RM ISR vs PM ISR - Rugxulo, 22.08.2007, 00:13
        IRQ ISR IDT [5] RM ISR vs PM ISR - Steve, 23.08.2007, 13:42
        IRQ ISR IDT [5] RM ISR vs PM ISR - rr, 23.08.2007, 15:25
        IRQ ISR IDT [5] RM ISR vs PM ISR - Steve, 24.08.2007, 01:11