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DJGPP - how to make timeout in loop when interrupt disabled? (Developers)

posted by Japheth , Germany (South), 22.04.2008, 12:41

> The KBC port - what did you mean by "refresh cycle"? Is it DRAM refresh
> period? I think this can vary for different DRAM chips. There are some
> with extended refresh time, standard is about 15us? I don't need any
> precise timing here but it shouldn't lock longer than 1 second if there's
> no response from IDE port.

IIRC this bit is toggled when PIT timer 1 reaches zero. PIT timer 1 was used for DRAM refresh in the original IBM PC. What's important is that the timer ticks with a known frequency and its initial counter value isn't changed usually.

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MS-DOS forever!

Complete thread:

• DJGPP - how to make timeout in loop when interrupt disabled? - RayeR, 22.04.2008, 02:08 (Developers)
  • DJGPP - how to make timeout in loop when interrupt disabled? - Japheth, 22.04.2008, 10:33
    • DJGPP - how to make timeout in loop when interrupt disabled? - RayeR, 22.04.2008, 11:34
      • DJGPP - how to make timeout in loop when interrupt disabled? - Japheth, 22.04.2008, 12:41
        • DJGPP - how to make timeout in loop when interrupt disabled? - RayeR, 22.04.2008, 14:04
      • DJGPP - how to make timeout in loop when interrupt disabled? - Ninho, 22.04.2008, 12:42