---
title: BIT CORPORATION BIT 90
categories:
- Computers
types:
- Home Computer
origins:
- Korea
years:
- '1983'
cpus:
- Zilog Z80A
params:
  name: BIT 90
  image: /media/museum/photos/bit-corp_bit90_chicklet.jpg
  company: /companies/bit-corporation
  company_name: BIT CORPORATION
  specs:
  - label: NAME
    value: BIT 90
  - label: MANUFACTURER
    value: Bit Corporation
  - label: TYPE
    value: Home Computer
  - label: ORIGIN
    value: Korea
  - label: YEAR
    value: '1983'
  - label: BUILT IN LANGUAGE
    value: BIT90 Basic 3.1
  - label: KEYBOARD
    value: |-
      Rubber keyboard, 66 keys with Basic statements and graphic symbols\
      ESC, CAPS LOWER, SHIFT (x2), CTRL, BASIC, FCTN, RETURN, BS (backspace), DEL, INS, RETURN, RST (Reset), arrow keys, symbol key
  - label: CPU
    value: Zilog Z80A
  - label: SPEED
    value: 3.85 MHz
  - label: CO-PROCESSOR
    value: Texas Instruments TMS-9929A (Video Generator)
  - label: RAM
    value: 2 KB RAM (TMM2016AP) (up to 64 Kb), 1Kb left for programming
  - label: VRAM
    value: 16 KB VRAM (AM9016 x 8)
  - label: ROM
    value: 24 kb
  - label: TEXT MODES
    value: 32 x 24 with 16 colors
  - label: GRAPHIC MODES
    value: 64 x 48 (semi-graphic mode), 256 x 192
  - label: COLORS
    value: '16'
  - label: SOUND
    value: Texas Instruments SN76489AN soundchip, 3 voices, 5 octaves
  - label: SIZE / WEIGHT
    value: 330mm width x 214mm depth x 50mm heigth
  - label: I/O PORTS
    value: Cardridge slot, Cassette interface (2400 bauds), RGB video output, RF TV output, Audio output, 2 x Joystick port (DB9), Expansion Bus
  - label: POWER SUPPLY
    value: External PSU
  - label: PERIPHERALS
    value: Memory expansion, printer, disk drive, modem, RS232c interface
  - label: PRICE
    value: Unknown
  tabs:
  - photos
  - adverts
  - connectors
  - docs
  forum_thread: 108
  photos:
  - title: BIT-90
    subtitle: ''
    text: Picture courtesy of [8-bit Nirvana](http://www.zock.com).
    image: /media/museum/photos/bit-corp_bit-90_1.jpg
  - title: FRONT PICTURE
    subtitle: ''
    text: This picture is courtesy of MSX.ORG
    image: /media/museum/photos/bit-corporation_bit90_front_2.jpg
  - title: ANOTHER PICTURE
    subtitle: ''
    text: Picture courtesy of [Stefan Walgenbach / HomeComputer.de](http://www.homecomputer.de/)
    image: /media/museum/photos/bit-corp_bit-90_3.jpg
  - title: BOX
    subtitle: ''
    text: Picture courtesy of Millon.com
    image: /media/museum/photos/bit-corporation_bit90_box_1.jpg
  adverts:
  - title: GERMAN ADVERT
    subtitle: ''
    text: This is a German advertisement for the BIT-60 and BIT-90 models. Atari VCS-2600 cartridges are scattered in front of the BIT-60 to show that the it is really compatible with the VCS-2600 ! But strangely enough, there is no picture displayed on the TV. Were these models really working ? ;-)
    image: /media/museum/pubs/bit-corp_bit60-90_pub_1.jpg
  connectors:
  - title: POWER SUPPLY CONNECTOR
    subtitle: ''
    text: ''
    image: /media/museum/connectors/bit-corporation_bit90_power-connector%5B9%5D.jpg
  - title: TAPE / VIDEO / SOUND CONNECTOR
    subtitle: ''
    text: ''
    image: /media/museum/connectors/bit-corporation_bit90_video-connector%5B1%5D.jpg
  docs:
  - title: BIT 90 OPERATION MANUAL
    url: null
    cover: /media/museum/docs/couvs/bit90_operation-manual_cover.jpg
    text: |-
      **BIT 90 OPERATION MANUAL**\
      written by Bit Corporation

       compiled/archived by www.retrocomputers.gr\
       type of document : ZIP\
       size : 9,37 Mb\
       source : [www.retrocomputers.gr](https://www.retrocomputers.gr/)
  oc_id: 93
  source:
    url: https://web.archive.org/web/20230608154042/http://www.old-computers.com/museum/computer.asp?c=93
    date: '2023-06-08'
---

This is an obscure and rare system, compatible with Colecovision cartridges, just like the [Coleco Adam computer](/museum/coleco-adam/). Apparently, BIT Corporation was involved in the development of the Colecovision project. So this system is maybe not a outlaw project after all.

This computer had a completely rubber keyboard a bit like the [ZX-Spectrum](/museum/sinclair-zx-spectrum/). Basic statements and graphic symbols could be accessed via combinations of "function" keys such as CTRL, BASIC, FCTN and a special symbol key.

The BIT-90 could display 16 colors and 32 sprites, with a high-resolution of 256 x 192 pixels.

Like its little brother the [BIT-60](/museum/bit-corporation-bit-60/), the BIT 90 could directly accept [Colecovision](/museum/colecovision/) cartridges, and [Atari 2600](/museum/atari-vcs-2600/) cartridges through a special interface.

The BIT-90 bears a striking resemblance with the [Sega SC-3000](/museum/sega-sc-3000-sc-3000h/) computer. It is not compatible, but share a lof things in common. The main common point is that they are both designed around the powerful Texas-Instruments Video Display Processor TMS-9929A which was revolutionnary for the time. A lot of systems used it, and that explains the common feeling when using them: Colecovision, Creativision, MSX computers, Sega SG-1000, Sega-SC3000, Tomy Tutor, Casio PV-1000/2000, etc.. not to forget the TI-99/4 which of course the first to use that VDP.

The BIT-90, like the BIT-60 seems to have been available in different colored models, at least one white and one grey.

Maybe due to legal problems, this computer didn't last long.

<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>