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R > R.F.T. > KC 85/4   

KC 85/4

The KC85/4 was the last one of the KC85/x series. Although it doesn’t look quite different, some internals changed. The whole design changed a bit, and software which used to access hardware directly, sometimes didn’t work any longer, as some addresses changed.

Also, memory was expanded to 64 KB, and the whole memory could be used by software. The ROM increased to 20 KB. The CAOS system offered printer support for most of the available GDR printer models.

There are two expansion slots, which could be extended to four through an expansion set-top.

Information kindly provided by Stefan Goehler.

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


The last Computer of the KC series was the KC-Compact in 1990.

This mashine is 100$ Amstrad CPC compatible, with the optional floppy disk controler, the RAM was expanded from 64kb to 128kb for using CP/M+

For detailed KC85 informations and documentations look at: (german and english language) (lots of documentations in PDF, german) (one of the maincoders for KC85/4, german only)

Thursday 7th April 2011
Michael Weigel (East Germany)


NAME  KC 85/4
ORIGIN  Germany
YEAR  july 1988
END OF PRODUCTION  Somewhere around 1990
BUILT IN SOFTWARE / GAMES  CAOS 4.2 (Cassette Aided Operating System), integrated Basic interpreter
CONTROLLERS  QWERTZ-Layout, Function keys (F1-F6), Cursor keys
pretty small keys, not easy to type with; 64 keys; connected through mono DIN-jack
CPU  U880 D (Z80 clone)
SPEED  1,77 Mhz
CO-PROCESSOR  none; CPU even managed video processing
RAM  64 KB, expandable to max. 4 MB
ROM  20 KB
TEXT MODES  40 x 32 characters
GRAPHIC MODES  320 x 256
COLORS  16 colors/foreground, 8 colors/background
SOUND  2 tone generators, 2x5 Octaves; Stereo when connected to a stereo hifi system (constant volume), mono over TV if connected through FBAS/RGB (32 volume levels)
SIZE / WEIGHT  380x250x70 mm; Keyboard 296x152x29 mm / 4,8 Kg (including keyboard)
I/O PORTS  Color TV output through PAL HF-modulator, TV output via FBAS/RGB, DIN connector for cassette drive (including TTL motor switch voltage) or to connect to a stereo, 2 expansion slots, expansion interface for set-top expansion
MEDIA  none; external cassette player required (connected via DIN connector)
NUMBER OF GAMES  CAOS 4.2 (for cassette operation), MicroDOS (if working with Diskdrive expansion, CP/M compatible)
PERIPHERALS  V24 interface, memory cards (16/64 KB), EPROM-module, several user ports, 5 Ľ'' diskdrive set-top (included own U880 system with 64K RAM!!)
PRICE  2200 Marks

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Ready prompt
ZX Spectrum
Arcade cherry
Spiral program
Atari joystick
Battle Zone
Vectrex ship
C64 maze generator
Moon Lander
Competition Pro Joystick
Atari ST bombs
Elite spaceship t-shirt
Commodore 64 prompt
Pak Pak Monster
Pixel Deer
BASIC code
Shooting gallery
3D Cubes
Pixel adventure
Vector ship

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