Hej Thomas!

Monday June 17 1996, Thomas Seeling writes to Allan Mertner:

 TS> How "direct" is your meaning of "direct"? Can
you prove that you are
 TS> using the fastest method to access I/O ports?

I cannot, of course. The fastest way would be to translate
  Port[100] := 100;
to
  mov  dx,100
  out  dx,100

- or something like that.  Unfortunately, OS/2 does not allow this and VP
generates code to call equivalent code in a segment with I/O privilege,
which of course adds some overhead.

Still, it is much faster than using the TESTCFG interface and can only be
done faster by implementing the I/O routines in a dedicated device driver.

Yours,
Allan

--- GoldED 2.50.A0531+