Digital Control of an SCR (Thyrister) DC Motor Control Board?

Dear Group,

I currently have a 120/220VAC SCR DC motor controller to power a 90VDC
motor which is connected to a milling machine spindle.
It uses a varible resister / pot to ajust motor RPM.

I wish to control this motor via this board digitaly from the parallel
port of a PC possibly using PWM and Linux EMC2 CNC Software.
How / what could I use to replace the Varible resister / pot?
Also I beleive the pot connection are floating.

Any advice / pointers would be very much appreciated :-)

Regards
SRG
.

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