Re: STG IO

[Paul <paul.corner-at-tesco.net>]

Hi Ray

A brief look at stg.c shows that the digital outputs do a read-modify-write 
to port C. So if four outputs are sufficient for spindle/coolant control, 
then a modified bridgeportio *should* work. Although I would be inclined to 
make a few changes and use port D for output and the upper half of port C for 
input.

Regards, Paul.


On Saturday 31 Aug 2002 3:25 pm, Ray Henry wrote:
> I believe that the key to the extra io is in the notion that none of the
> the port address that represents them are used by the realtime stuff.  
> With steppermod and freqmod, if no change is to be written, the realtime
> ignores those addresses.  I'm guessing that stg does the same.