[Info-vax] Part number encoding

[gerry77 at no.spam.mail.com]

Hi all,

the thread about factory codes gave me the idea to ask about a thing that
arouses my curiosity since I started my Hobbyist "career" on OpenVMS: the
part number encoding. That is the codes in the usual XX-XXXXX-XX form.

The only thing I've understood is that subsequent releases of software and
manuals usually maintain the same code, except for the fifth character of
the second group which is increased by one.

Does anyone here can shed some light on this subject?

Thank you very much,
G.