And as if by magic when I had a quick look this morning, my stirring up of the cupboard in the smallest bedroom had caused a pristine, albeit folded into four, Programma 101 coding sheet to be disgorged.
And here is a manual for the beast http://www.classiccmp.org/dunfield/calc/olpro101.pdf
The coding sheets are similar to those appearing towards the back of the manual, but somewhat nicer looking.
The machine is similar in operation but not as powerful as my old Casio FX-502P programmable calculator. Whatever happened to Casio?