Mostek MK50312

[Tony Wills]

Does anyone have any datasheet/hardware details of the early Mostek 
calculator chip MK50312N ?

It may be listed in "Mostek, MOS Integrated Circuit Guide", 1975 - a 
magazine sized, 138 page, blue and
silver book.  Which apparently covers the F8 and several early memory 
chips and
some calculator chips.

(Not listed in the Mostek 1974 "Integrated circuit guide")

Any help would be appreciated, even just confirmation that it is listed 
in the '75 guide.

--Tony