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TK EXTended

TK Extended was a local version of PC-XT, launched by Microdigital in 1988.

To minimize the technological gap between American and Brazilian models, the manufacturer offerred an upgrade card, named Cometa 286 (Comet 286), which goal was to replace the processor with a 7.15 MHz 20286 Intel processor, and also a 20287 math co-processor.

This model marked the end of Microdigital, the same manufacuter of TK family, which included Sinclair ZX-81 (TK-85), Spectrum (TK-90 and 95) and also Apple licensed products adapted to meet Brazilian laws regarding national content.

Thanks to Roberto Isiri for information and picture.

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.
Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


Are you sure the upgrade isn''t an Intel 80286 processor and 80287 math coprocessor?

Thursday 31st May 2018
Steve Angel (USA)


MANUFACTURER  Microdigital
TYPE  Professional Computer
ORIGIN  Brazil
YEAR  1988
KEYBOARD  Full stroke 86 key (84 key IBM PC-XT + 2 reset keys)
CPU  Intel 8088-2
SPEED  4.77 or 8 MHz
CO-PROCESSOR  8087-2 (optional)
RAM  768 KB
TEXT MODES  80 chars. x 25 lines
GRAPHIC MODES  320x200 (4color) or 640x200 (monochrome)
SOUND  PC Speaker
SIZE / WEIGHT  Unknown
I/O PORTS  1 x Parallel, 2 x Serial RS-232
BUILT IN MEDIA  2 x 5.25''. floppy drives or 1 x 5.25'' + 1 x 3.5'' low density
OS  MS DOS 3.2
POWER SUPPLY  150w switching power supply unit
PERIPHERALS  8 PC compatible expansion slots
PRICE  Unknown

Please buy a t-shirt to support us !
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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