--- title: BIT CORPORATION BIT 90 categories: - Computers types: - Home Computer origins: - Korea years: - '1983' cpus: - Zilog Z80A params: name: BIT 90 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 photos: - title: BIT-90 subtitle: '' text: Picture courtesy of [8-bit Nirvana](http://www.zock.com). image: null - title: FRONT PICTURE subtitle: '' text: This picture is courtesy of MSX.ORG image: null - title: ANOTHER PICTURE subtitle: '' text: Picture courtesy of [Stefan Walgenbach / HomeComputer.de](http://www.homecomputer.de/) image: null - title: BOX subtitle: '' text: Picture courtesy of Millon.com image: null 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: null connectors: - title: POWER SUPPLY CONNECTOR subtitle: '' text: '' image: null - title: TAPE / VIDEO / SOUND CONNECTOR subtitle: '' text: '' image: null docs: - title: BIT 90 OPERATION MANUAL url: null cover: null 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/) comments: - author: Ray (Netherlands) date: Wednesday 6th September 2017 text: I got this computer when I was 10 years. played a few games (had 5 or so). Does anyone know how I can find games for this computer. It still workes fine. - author: Laios (Greece) date: Friday 11th July 2014 text: |- Coleco carts work but not all of them\ also can not assign 2nd fire button to joystick for games\ that use it so you have to use one button in keyboard and one in joystick - author: Fernando L date: Sunday 19th May 2013 text: I owned a Bit-90 when I was child and I always remember that everytime started to program, after a few lines it showed "Out of memory". Now I understand why, it has 1KB of RAM!! Great memories of 80''. - author: mangler (The vatican) date: Saturday 4th September 2010 text: wot channel/band did the rftv output on @:) - author: Lisias Toledo (Earth) date: Tuesday 19th March 2002 text: |- Hi! When younger, I won a bit-90 computer and one thing I remember well is that it had a connector on the left side where I could put COLECO cartridges!!!!! 8-).\ I remember playing Zaxxon for hours and hours... It worked even without\ joystick, as the bit-90 used the cursor keys as alias for joy1. I miss it... 8-) 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.
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.