Well, the subject: line says it all really, but I'd better explain if only to avoid the 'You should be able to figure it out for yourself' (I could, if I have the drive) and the 'Most of it's the same as the drive in an HP9830' (it is, but it's the different bits I am interested in) type of replies. I've bought a few interfaces for the HP98x0 series of 'calculators' [1]. One of them is the interface for said tape drive, it's a single PCB containing about 10 TTL chips. What I am looking for, though, is a pinout of the interface connector on the drve iteslf so I have some idea what to expect on the end of this interface's cable. [1] They're called 'calculators' to get past the purchasing depatrments of the time. They're really computers -- the 9830 in particular programmed in BASIC, has an alphanumeric display and supports HPIB and I believe a hard disk. Other machines in the family (9810 and 9820) are more like calculators, but haev the same bit-serial 16 bit proceessor, etc. -tony