DOS ain't dead

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

posted by Steve  , US, 23.08.2007, 13:42

> ... 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.

Correct.

> And the Pentium has a 64-bit one, last I heard.

There are both 32-bit and 64-bit Pentiums.

> Plus, the original IBM PC was an 8088 and had an 8-bit one (vs. the
> 8086's 16-bit one, twice as fast).

8088 is 8-bit internal and external. 8086 is 16-bit internal and 8-bit external - designed to retain adaptability to older mainboards (like 386SX later). The 80286 introduced full 16/16.

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