Help... lost link to calc'-sized indexer controller...

Hey all,
I remember seeing a small calculator sized indexer stepper
controller that you would use to retrofit or build a standard
indexer.
Basically it was a self-contained unit with some buttons and an LCD
and could power a small stepper or be combined with an amp.
I think it was made in England or somewhere.

Does anyone have a link to this unit?

Many Thanks
Sean