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M > MEMOTECH  > MTX 500 /512     


MEMOTECH
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.




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http://www.youtube.com/watch?v$zsjTpFR0oYQ

please help we have zx spectrum 48k and one 128k program running at 6mhz using external ram and snapper discs from velesoft site

          
Saturday 6th April 2013
Roger Jowett (Ulster Londonderry)
sam coupe

https://www.youtube.com/watch?v$zsjTpFR0oYQ

not allowed to post this here!

          
Wednesday 20th February 2013
Roger (ulster fry)
https://www.youtube.com/watch?v$zsjTpFR0oYQ

A Service Manual exists.
One was sold a while back on eBay.
I too would like a copy, or a scan of it.

{{{ Andy

          
Sunday 19th August 2012
Andy Key (England)
Andys Memotech site

 

NAME  MTX 500 /512
MANUFACTURER  Memotech
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
SPEED  4 MHz
CO-PROCESSOR  TM 9918 or 9928 (video) and TI 76489 (sound)
RAM  MTX-500 : 32 KB
MTX-512 : 64 KB (up to 512 KB)
VRAM  16 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
COLOrsc  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
OS  CP/M
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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