DOS ain't dead

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

posted by RayeR , CZ, 10.12.2012, 18:04

> 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.

Oh yes, I forgot, DJGPP use this as clock source for uclock() and udelay() precise timing...

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DOS gives me freedom to unlimited HW access.

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