DOS ain't dead

Waiting for 3 (or 3.3) microseconds? 286 and up. (Developers)

posted by Japheth , Germany (South), 10.12.2012, 11:42

> What is a good way to guarantee a wait for a few microseconds? Can I use
> the same code on a 286 while still guaranteeing long enough delay on a
> 64bit cpu who happens to be talking to a real sound blaster in an ISA slot?
> Those motherboards exists [even though I don't have one, nor a real sound
> blaster].

One may query Keyboard controller port B ( cpu port 61h ). Bit 4 ("refresh request") toggles at a frequency of 1.193 MHz. It's often used for PC-speaker sound timings.

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MS-DOS forever!

Complete thread:

• Waiting for 3 (or 3.3) microseconds? 286 and up. - myrkraverk, 09.12.2012, 23:41 (Developers)
  • Waiting for 3 (or 3.3) microseconds? 286 and up. - RayeR, 10.12.2012, 03:09
  • Waiting for 3 (or 3.3) microseconds? 286 and up. - Japheth, 10.12.2012, 11:42
    • Waiting for 3 (or 3.3) microseconds? 286 and up. - RayeR, 10.12.2012, 18:04
  • Waiting for 3 (or 3.3) microseconds? 286 and up. - bretjohn, 10.12.2012, 15:52
    • Waiting for 3 (or 3.3) microseconds? 286 and up. - myrkraverk, 10.12.2012, 21:22
  • Waiting for 3 (or 3.3) microseconds? 286 and up. - myrkraverk, 10.12.2012, 21:16
  • Waiting for 3 (or 3.3) microseconds? 286 and up. - Rugxulo, 10.12.2012, 22:03
    • Waiting for 3 (or 3.3) microseconds? 286 and up. - myrkraverk, 13.12.2012, 14:07
      • Waiting for 3 (or 3.3) microseconds? 286 and up. - marcov, 13.12.2012, 22:51
        • Waiting for 3 (or 3.3) microseconds? 286 and up. - RayeR, 14.12.2012, 01:12