yann64andClaude Opus 5.5
b274874139
1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
131 lines
4.1 KiB
Markdown
131 lines
4.1 KiB
Markdown
---
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title: Microdigital TK-85
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categories:
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- Computers
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types:
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- Home Computer
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origins:
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- Brazil
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years:
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- '1983'
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cpus:
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- Zilog Z80 A
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params:
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name: TK-85
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image: /media/museum/photos/microdigital_tk85_system_s2.jpg
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company: /companies/microdigital
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company_name: Microdigital
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specs:
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- label: NAME
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value: TK-85
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- label: MANUFACTURER
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value: Microdigital
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- label: TYPE
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value: Home Computer
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- label: ORIGIN
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value: Brazil
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- label: YEAR
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value: '1983'
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- label: END OF PRODUCTION
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value: Unknown
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- label: BUILT IN LANGUAGE
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value: Improved version of the ZX81 Basic
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- label: KEYBOARD
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value: 40-key QWERTY rubber keyboard with up to 5 function per key
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- label: CPU
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value: Zilog Z80 A
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- label: SPEED
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value: 3.25 MHz
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- label: RAM
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value: 16 KB up to 48 KB
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- label: ROM
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value: 10 KB
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- label: TEXT MODES
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value: 32 columns x 24 lines
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- label: GRAPHIC MODES
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value: 64 x 44 dots
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- label: COLORS
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value: Monochrome
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- label: SIZE / WEIGHT
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value: 23 (W) x 14 (D) x 3 (H) cm / 500g
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- label: I/O PORTS
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value: Expansion port, Tape-recorder, RF video out, Joystick
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- label: BUILT IN MEDIA
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value: None
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- label: PERIPHERALS
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value: Microdigital printer, all ZX81 peripherals
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- label: PRICE
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value: Unknown
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tabs:
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- photos
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- adverts
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- hardware
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- docs
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forum_thread: 950
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photos:
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- title: LARGE VIEW
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subtitle: ''
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text: ''
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image: /media/museum/photos/microdigital_tk85_largesystem_s2.jpg
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- title: SIDE VIEW
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subtitle: ''
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text: ''
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image: /media/museum/photos/microdigital_tk85_system_s3.jpg
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- title: TOP VIEW
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subtitle: ''
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text: The case and keyboard design are very similar to the Sinclair Spectrum's.
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image: /media/museum/photos/microdigital_tk85_topview_s1.jpg
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- title: KEYBOARD CLOSE-UP
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subtitle: ''
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text: ''
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image: /media/museum/photos/microdigital_tk85_keyboardcloseup_s1.jpg
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- title: REAR SIDE
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subtitle: ''
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text: ''
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image: /media/museum/photos/microdigital_tk85_rear_s1.jpg
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- title: POWER SUPPLY UNIT
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subtitle: ''
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text: ''
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image: /media/museum/photos/microdigital_tk85_powersupply_s1.jpg
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adverts:
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- title: 'ADVERT #1'
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subtitle: ''
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text: |-
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From the magazine 'Micro Sistemas' of March 1983
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Thanks to **www.mci.org.br**
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image: /media/museum/pubs/microdigital_tk85_pub_s1.jpg
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hardware:
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- title: MICRODIGITAL JOYSTICKS
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subtitle: ''
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text: ''
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image: /media/museum/hardware/microdigital_tk85_joysticks_s1.jpg
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docs:
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- title: MICRODIGITAL TK-85 BASIC MANUAL (PORTUGUESE)
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url: http://www.datacassete.com.br/uploads/manuais/zx81/tk85.pdf
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cover: /media/museum/docs/couvs/tk85%20basic%20manual.jpg
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text: |-
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[**MICRODIGITAL TK-85 BASIC MANUAL (PORTUGUESE)**](http://www.datacassete.com.br/uploads/manuais/zx81/tk85.pdf)written by Microdigital
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compiled/archived by www.datacassete.com.br\
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type of document : PDF\
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size : 19.6 MB\
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source : [www.datacassete.com.br](http://www.datacassete.com.br)
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**... READ THE ONLINE VERSION BY CLICKING BELOW :**
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oc_id: 976
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source:
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url: https://web.archive.org/web/20230608085718/http://www.old-computers.com/museum/computer.asp?c=976
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date: '2023-06-08'
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---
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After the **TK80**, [TK82](/museum/microdigital-tk-82/) and **TK83** the TK85 was the last [ZX-81](/museum/sinclair-zx-81/) compatible machine Microdigital produced.
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However it wasn't only a simple copy of the ZX-81 but featured several useful enhancements. Its rubber keyboard and case were similar to the Spectrum's and were much more pactical for intensive use. The 10 KB ROM held an improved version of the Sinclair's Basic with strings management and editing facility, as well as some primitive graphic commands.
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Several additional routines allowed to record tape programs up to 4200 bits per second, manage a joystick interface and the built-in three-voice sound generator.
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Thanks to the TK85, Microdigital started to lead the Brazilian home computer market, front of Sinclair and its US branch, Timex.
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Thanks to **Joao Roberto** for most of the pictures and information.
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