programming paralel port

[Tomas D <u0giene%yahoo.com@localhost>]

Hi,
I'm trying to find some info on how to do basic programming on mac parallel 
port ttya or ttyb. 
I came up with the following algorithm
set pin1 high
|
check if pin2 is high
     |
    / \ 
High     Low -> go to check if pin2 is high
|
write character to a file -> go to check if pin2 is high

pin1 and pin2 are connected to a shaft sensor which gives n amount of short 
circuits in 1 revolution

pin1
  |
  = shaft sensor
  |
pin2

uname (just in case)
[wally@macppc ~]$ uname -a
NetBSD macppc 3.0 NetBSD 3.0 (GENERIC) #0: Mon Dec 19 01:25:38 UTC 2005  
builds%b2.netbsd.org@localhost:/home/builds/ab/netbsd-3-0-RELEASE/macppc/200512182024Z-obj/home/builds/ab/netbsd-3-0-RELEASE/src/sys/arch/macppc/compile/GENERIC
 macppc

I found some examples of doing something similar (turning LED connected to 
parallel port) on x86, *nix based systems and the codes did not look that long 
the thing that draw my attention was 
#include <asm/asm.h> (assembler header file for x86 instruction set), I tried 
looking for this file on my system and it comes up under 
/usr/include/macppc/asm.h
/usr/include/powerpc/asm.h
(macppc/asm.h simply points to powerpc/asm.h which has 266 lines of code) 

 
Thanks everyone for your ideas



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