Browsing around today I came across the following
EPROM & FORTH. Module for the Micro-Professor containing an Eprom and
full manual. Specification:- FORTH-79, EPROM (8KB). Including line
editor, ramdisk feature has up to 40k user RAM capbility. 4.99
ZILOG Z80 CHIPS. I/O memory expansion module for the Micro-Professor
(see Q0831) Spec:- IOM-MPF-IP, Contains Z80-CTC (counter and timer
chips) and Z80-PIO (parallel I/O chip) 2k eprom. 2k RAM. Uses parallel
I/O control. Supplied with manual and ribbon cable. 9.99
AT Greenweld Electronics in the UK, web
http://www.greenweld.co.uk
-- hbp