On 11 July 2018 at 23:01, Joe Hildreth <[email protected]> wrote:

>   I think the driver works just fine.  I agree that the control port is 
> bidirectional.  I would think that the entire control group of pins is set to 
> either output (for modes in and out) and set to input (for mode x).

I think you are right. use_control_in is only set to 1 for X mode
https://github.com/LinuxCNC/linuxcnc/blob/master/src/hal/drivers/hal_parport.c#L540



-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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