Length of IOWR

[nbucska]

On an 800 MHz PC I measured the length of the IOWR and IORD--- both were about 1 microS.

Is there a way to reduce it ? <nbucska@pcperipherals.com>

 

[mr2u]

That is pretty slow, wht kind of processor and motherboard/bios ?, software wise you can muck w/the low level r/w code, but it probally won't get you much, you will probally have to review the hardware 'design' and see if there is anything you can do there. Also did you use a logic analyzer or scope to determine the timing ???

 

[nbucska]

Scope, DOS, 800 MHz -- I think -- PENTIUM. Program assy:

mov dx,port
mov al,data
lab: out dx,al
jp lab
Obviously something inserts a few hundred clk cycles.
I know the 188/186 has programmable wait states
but not hundreds.... <nbucska@pcperipherals.com>