Stag PPZ EPROM programmer

[John Honniball]

I have a fine old Stag PPZ modular EPROM programmer:

    http://www.gifford.co.uk/~coredump/inst.htm#PPZ

It takes plug-in EPROM (model Zm2000) and PAL (Zm2200) modules, called
Z-modules by Stag.  I've recently acquired a new module, Zm3000, which
looks like a more recent EPROM module.  The chips in the Zm3000 are
date coded in 1993, whereas the Zm2000 is nearer 1988.  The PPZ main
unit contains a 6809 CPU and a small CRT display.

Does anyone know anything about this system?  What about other Z-module
types?  In particular, should the Zm3000 work with the PPZ, because I
currently get an error message "Incorrect Mainframe"?

Thanks in advance for any clues!  (Virtually all I get from Google is a
link back to my own web page!)

-- 
John Honniball
coredump at gifford.co.uk