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M > MEMOTECH  > MTX 500 /512   

MTX 500 /512

The Memotech company started manufacturing expansion cards and high quality memory modules for the Sinclair ZX 81 home computer.

The British Memotech MTX 512 has a hardware which looks like the
Sord M5. It also has characteristics, which are close to the MSX standard, but is not MSX compatible.

It uses a dedicated chip for video (Texas Instruments TM 9918 or 9928) and sound (Texas Instruments SN76489A) and has a very nice mechanical keyboard and a nice black aluminum case!

Both models have the same characteristics, but the MTX 500 has only 32 KB RAM and the 512, 64 KB. It had no success and was replaced a short time later by the RS-128.


Jon O'Brien reports:
I was in computer retail in Bracknell at the time the MTX was released, owned an MTX 512 (which I still have somewhere, I think) and spent quite a bit of time talking on the telephone to the owner of Memotech (whose name now escapes me) about stocking the machines. I was told at the time that much of the MSX design was based on the company's work on the MTX. How true this is I can't say, but it is a claim that was made at the time.

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


I found mtx512 games$2528BKL$$memotech

Sunday 14th August 2022
Savior2022 (germany)

Would a 500 psu work on the 512

Thursday 7th October 2021
Gary (Ireland)

@Gary - I can''t find any ready-to-buy replacement PSUs, but it''s possible to build one yourself - see$9$t$76

Sunday 12th September 2021
A T (Scotland)


NAME  MTX 500 /512
TYPE  Home Computer
ORIGIN  United Kingdom
YEAR  1983
BUILT IN LANGUAGE  BASIC, LOGO, NODDY (interactive sequential controller, Z80 Assembler/Disassembler
KEYBOARD  Full stroke 79 key with numeric keypad and 8 function keys
CPU  Zilog Z80 A
CO-PROCESSOR  TM 9918 or 9928 (video) and TI 76489 (sound)
RAM  MTX-500 : 32 KB
MTX-512 : 64 KB (up to 512 KB)
ROM  24 KB (MTX Basic)
TEXT MODES  32 or 40 chars x 24 lines.
80 x 24 with FDX or HDX disc based expansions
GRAPHIC MODES  four modes, maximum : 256 x 192. 32 sprites
COLORS  16 maximum
SOUND  3 voices + pink noise / 6 octaves (Texas-Instruments SN76489A)
SIZE / WEIGHT  48.6 (W) x 20.3 (D) x 5.7 (H) cm / 2.6 Kg
I/O PORTS  Cassette port, Parallel I/O port, 2 x joystick ports, Audio ouput, Composite video output, Cartridge slot, Parallel/Centronics port
POWER SUPPLY  External power supply unit (22.5 VAC, 1A tapped at 18V and 9V)
PERIPHERALS  5.25'' Floppy disc unit, Communication board with two RS232 interfaces and disk drive bus
PRICE  £275 (MTX-500), £315 (MTX-512)

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