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M > MEMOTECH  > RS 128   

RS 128

The Memotech RS128 is the successor of the Memotech MTX 512. It looks like the MTX 512 and has almost the same characteristics.

Like the MTX 512, it sports an aluminum case. Contrary to the MTX, it has RS-232 built-in interfaces, primarily used to connect the FDX floppy drive (the data are sent from the disk to the RAM at a whopping 9600 baud!). The FDX unit comes with a 80 columns card and allows the RS128 to run CP/M programs.
It was supplied with NewWord (word processor) and SuperCalc (spreadsheet).
Only the lower 64 KB can be used, the upper 64 KB are used as a RAM disk.

Similar the MTX512, the RS128 has characteristics very near of the MSX computers (same sound chip & video for example) but wasn't able to use MSX software.

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

Hmmm, is said same Sound and VDP as MSX, i dont think so. Memotech use a Texas Soundprocessor, wich is equal to Colecovision and Sega SC-1000 console. But not compatible with MSX, sound data can by the way be converted, but is not compatible. I know this since i have been converted a few MSX games to Memotech, read more at

Friday 13rd July 2012
Claus (Sweden)


NAME  RS 128
TYPE  Home Computer
ORIGIN  United Kingdom
YEAR  1984
BUILT IN LANGUAGE  MTX Basic, Noddy, Assembler
KEYBOARD  Qwerty full-stroke keyboard, 79 keys. Numeric keypad. 8 function keys.
CPU  Zilog Z80 A
CO-PROCESSOR  TMS-9918A video chip from Texas Instruments. SN-76489A sound chip from Texas Instruments
RAM  128 KB (up to 512 KB)
ROM  24 KB (Basic + assembler)
TEXT MODES  40 x 25 / 32 x 24
GRAPHIC MODES  four modes, maximum : 256 x 192
COLORS  16 maximum
SOUND  3 voices / 6 octaves
I/O PORTS  TV output, composite video output, 2 x joystick, Cardridge, Tape, Audio, Centronics, 2 x RS232, Bus
POWER SUPPLY  External power supply unit
PERIPHERALS  FDX floppy disk expansion system (with CP/M)
PRICE  £399 (UK, october 1984)

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