---
title: Microdigital TK EXTended
categories:
- Computers
types:
- Professional Computer
origins:
- Brazil
years:
- '1988'
cpus:
- Intel 8088-2
params:
  name: TK EXTended
  image: /media/museum/photos/microdigital_tkextended_system_2.jpg
  company: /companies/microdigital
  company_name: Microdigital
  specs:
  - label: NAME
    value: TK EXTended
  - label: MANUFACTURER
    value: Microdigital
  - label: TYPE
    value: Professional Computer
  - label: ORIGIN
    value: Brazil
  - label: YEAR
    value: '1988'
  - label: END OF PRODUCTION
    value: Unknown
  - label: BUILT IN LANGUAGE
    value: None
  - label: KEYBOARD
    value: Full stroke 86 key (84 key IBM PC-XT + 2 reset keys)
  - label: CPU
    value: Intel 8088-2
  - label: SPEED
    value: 4.77 or 8 MHz
  - label: CO-PROCESSOR
    value: 8087-2 (optional)
  - label: RAM
    value: 768 KB
  - label: VRAM
    value: 16 KB
  - label: ROM
    value: 8 KB
  - label: TEXT MODES
    value: 80 chars. x 25 lines
  - label: GRAPHIC MODES
    value: 320x200 (4color) or 640x200 (monochrome)
  - label: COLORS
    value: '4'
  - label: SOUND
    value: PC Speaker
  - label: SIZE / WEIGHT
    value: Unknown
  - label: I/O PORTS
    value: 1 x Parallel, 2 x Serial RS-232
  - label: BUILT IN MEDIA
    value: 2 x 5.25''. floppy drives or 1 x 5.25'' + 1 x 3.5'' low density
  - label: OS
    value: MS DOS 3.2
  - label: POWER SUPPLY
    value: 150w switching power supply unit
  - label: PERIPHERALS
    value: 8 PC compatible expansion slots
  - label: PRICE
    value: Unknown
  tabs:
  - photos
  photos:
  - title: LARGER VIEW
    subtitle: ''
    text: ''
    image: /media/museum/photos/microdigital_tkextended_system_1.jpg
  comments:
  - author: Steve Angel (USA)
    date: Thursday 31st May 2018
    text: Are you sure the upgrade isn''t an Intel 80286 processor and 80287 math coprocessor?
  oc_id: 946
  source:
    url: https://web.archive.org/web/20230328113304/http://www.old-computers.com/museum/computer.asp?c=946
    date: '2023-03-28'
---

TK Extended was a local version of [PC-XT](/museum/ibm-pc-xt-model-5160/), 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](/museum/microdigital-tk-90x/) and [95](/museum/microdigital-tk-95/)) and also Apple licensed products adapted to meet Brazilian laws regarding national content.

Thanks to **Roberto Isiri** for information and picture.

<table> <tr> <td></td> <td>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.</td> <td></td> </tr> </table>