website/content/museum/bit-corporation-bit-90.md

title, categories, types, origins, years, cpus, params

title	categories	types	origins	years	cpus	params
BIT CORPORATION BIT 90	Computers	Home Computer	Korea	1983	Zilog Z80A	name image company company_name specs tabs forum_thread photos adverts connectors docs oc_id source BIT 90 /media/museum/photos/bit-corp_bit90_chicklet.jpg /companies/bit-corporation BIT CORPORATION label value NAME BIT 90 label value MANUFACTURER Bit Corporation label value TYPE Home Computer label value ORIGIN Korea label value YEAR 1983 label value BUILT IN LANGUAGE BIT90 Basic 3.1 label value KEYBOARD 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 value CPU Zilog Z80A label value SPEED 3.85 MHz label value CO-PROCESSOR Texas Instruments TMS-9929A (Video Generator) label value RAM 2 KB RAM (TMM2016AP) (up to 64 Kb), 1Kb left for programming label value VRAM 16 KB VRAM (AM9016 x 8) label value ROM 24 kb label value TEXT MODES 32 x 24 with 16 colors label value GRAPHIC MODES 64 x 48 (semi-graphic mode), 256 x 192 label value COLORS 16 label value SOUND Texas Instruments SN76489AN soundchip, 3 voices, 5 octaves label value SIZE / WEIGHT 330mm width x 214mm depth x 50mm heigth label value I/O PORTS Cardridge slot, Cassette interface (2400 bauds), RGB video output, RF TV output, Audio output, 2 x Joystick port (DB9), Expansion Bus label value POWER SUPPLY External PSU label value PERIPHERALS Memory expansion, printer, disk drive, modem, RS232c interface label value PRICE Unknown photos adverts connectors docs 108 title subtitle text image BIT-90 Picture courtesy of [8-bit Nirvana](http://www.zock.com). /media/museum/photos/bit-corp_bit-90_1.jpg title subtitle text image FRONT PICTURE This picture is courtesy of MSX.ORG /media/museum/photos/bit-corporation_bit90_front_2.jpg title subtitle text image ANOTHER PICTURE Picture courtesy of [Stefan Walgenbach / HomeComputer.de](http://www.homecomputer.de/) /media/museum/photos/bit-corp_bit-90_3.jpg title subtitle text image BOX Picture courtesy of Millon.com /media/museum/photos/bit-corporation_bit90_box_1.jpg title subtitle text image GERMAN ADVERT 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 ? ;-) /media/museum/pubs/bit-corp_bit60-90_pub_1.jpg title subtitle text image POWER SUPPLY CONNECTOR /media/museum/connectors/bit-corporation_bit90_power-connector%5B9%5D.jpg title subtitle text image TAPE / VIDEO / SOUND CONNECTOR /media/museum/connectors/bit-corporation_bit90_video-connector%5B1%5D.jpg title url cover text BIT 90 OPERATION MANUAL null /media/museum/docs/couvs/bit90_operation-manual_cover.jpg **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/) 93 url date https://web.archive.org/web/20230608154042/http://www.old-computers.com/museum/computer.asp?c=93 2023-06-08

This is an obscure and rare system, compatible with Colecovision cartridges, just like the Coleco Adam computer. 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. 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, the BIT 90 could directly accept Colecovision cartridges, and Atari 2600 cartridges through a special interface.

The BIT-90 bears a striking resemblance with the Sega SC-3000 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.