orac spindle count per rev ( reflective disk type ) ?

[cncbasher]

anyone know the number of pulses i should get per rev from the opto sensor ( reflective disk type ) on the orac
is it 100 ?
and is the index 1 or 2 pulses

trying to help a friend convert
and dont have a reflective type encoder fitted to mine

thanks

[Steam-Chris]

Yes 100 pulses and 1 pulse