After a successful run with the 380Z RM released this, a smaller cassette based
machine built round the 4 mhz Z80A processor with 32k of memory. Originally
produced in a black steel case (apparently the tool used to make the plastic
cases was dropped!) with a 40 character TV interface, it was later expanded
to have an 80 column monitor output. Once the moulding problems had been sorted
the white plastic cased version was released, and by this time there was also
a hi-res add-on card that allowed colour output - the original was monochrome
only. The only peripheral I can remember being released was a floppy drive even
though the base hardware wasn't designed for one - in CBM style all comms were
done using a high speed serial link.
This was the last Z80 machine RM produced; the followup was the high-spec PC-186.