Tim,
    Try looking at the code for my PC keyboard viewer - KEYBVIEW.ZIP
- the files you'd require are

wait.mac    &  delay.asm

and for examples of how to use,

lm032lhi.asm

You can find the code on:-

http://ourworld.compuserve.com/homepages/steve_lawther/ucindex.htm

hope this helps,

            Steve Lawther

*** All opinions are my own, not any employers, nor clients ***

>Tim Kerby <tim.kerby@ukonline.co.uk> wrote:-

>Does anyone know any good delay routines for the 16c84 and 16c74?
>I want to be able to enter a value for the clock speed (usually 4MHz, 10MHz
>and 20MHz) and the routine will adapt to the speed.  It must function as a
>subroutine taking the value in the w register as a delay in mS and then
>delay that amount of time.