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RESEARCH MACHINES  Research Machines

Research Machines is based in Oxford, England and the RM-380Z was their first model. It was designed specifically for the education market and the vast majority of its users were in this area.

The computer was based around the Z80A processor. It had a clever physical bus made of ribbon cable with IDC crimp on connectors obviating the problems of poor connections associated with edge connectors.

The basic system was composed of a 4 KB main unit, a typewriter style separate keyboard and a monochrome monitor. Single or dual floppy disc drives could be inserted in the main housings. 8" floppy drives (2 x 500 KB) were also available as well as a ‘High resolution’ colour graphics board.
The CP/M operating system was used to run lots of educational software.

Before and during the time that the BBC computers were introduced in English schools, the 380Z and its successor the Link 480Z met a great success, mostly due to their high reliability.

The RM-280Z should be the kit version of the 380Z but RM never shipped any kits but only pre-built 380Z machine, thinking better of the support problems it would cause.


Cassette tape version, by Simon Elliott:
I seem to recall using an early version of the RM380Z that used to load the OS from cassette tape, not floppy disk.
Once loaded, if the reset button was pressed, the 'J103' trick could be used to bypasss the reload; but the initial load was a real pain.
When the school I was attending purchased the disk drive and memory upgrade, all us CS students thought we'd entered computer heaven. ;-)
I also recall a very primitive add-on sound option, beeps from something not unlike a modern PC speaker.

Gary adds:
The 5.25" floppy drives were renowned for sudden failure caused by the rubber drive band coming off the drive. It was a simple matter to pop open the lid and re-seat the band.

Ben Jones remembers:
I remember using a 380Z in Canterbury, around 1980. As well as the excellent text editor (can't remember what it was called now, but I found nothing comparable for a decade afterwards), I loved the simplicity of programming it in assembler.
Two geeks I knew used to hang out in the school's computer room, one writing a version of Defender in 6502 Assembler on the BBC, the other writing Space Invaders in Z80 on the 380Z (I myself did a PacMan-like game on the 380Z - and I've still got the floppies). Any time the Space Invaders code hung, its author would pause an instant, look up, sniff, comment that he "could smell the 380Z's hi-res board burning" and dive for the white button. :-)
But best of all was the fact that even after a 'hard reset' like that, you simply had to enter "J103" to jump back to where you were before ("J100" did a full reboot). I think 0103 as a recovery address stayed around for years (or even decades) -- disassemble any .com programme even now, and you'll probably find that the first, 3-byte, instruction at 0100 jumps to the main start routine, while the next one jumps somewhere else. Oh if only that worked with Windoze... :-(

Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


has anyone still got a copy of the RESEARCH MACHINES Backgammon game that was on a floppy disc and came with out RM Basic in 1982?

Wednesday 6th July 2022
Philip Livingstone (United Kingdom)

I learned a lot of my early programming skills on a 380Z in the sixth form. It was quite unlike most of the micros of the day. Had more of a ''mainframe'' feel about it, from the steel casing down to the bootstrapping bios. I wrote my first proper application on it. A system for recording in real time the scores for Enfields inter-school ''one day olympics''. Meant they could know the outcome on the day instead of a week after the event. Using the app involved countless swapping of floppies to handle the data which vastly exceeded the memory capacity.
Programming was much more fun in those days.

Saturday 4th March 2017
Andy Pagin (UK)

And I just fell victim to the same quirk as my mentor. The engine presumably strips out the word d r o p, to prevent against embedded S Q L attacks.

Thursday 26th March 2015
J. Gareth Williams (Canada)


MANUFACTURER  Research Machines
TYPE  Professional Computer
ORIGIN  United Kingdom
YEAR  1977
KEYBOARD  Full stroke 60 keys QWERTY layout
CPU  Z80-A
RAM  4 KB expandable to 56 KB
ROM  2 or 3 KB (Monitor)
TEXT MODES  40 chars (later optional 80) x 24 lines
GRAPHIC MODES  80 x 72 monochrome as standard
320 x 192 16 colours and 640 x 480 4 colours with optional HRG board
COLORS  Monochrome or 256 colours (HRG option)
SIZE / WEIGHT  59.5 (W) x 42.5 (D) x 21.5 (H) cm
I/O PORTS  UHF TV, Composite video, Tape recorder, Parallel printer
BUILT IN MEDIA  Single or dual 5.25
POWER SUPPLY  Built-in power supply unit
PERIPHERALS  Graphic and colour board, 8'' 500 KB floppy drives
PRICE  From £519

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