Compucolor II

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Compucolor II
Compucolor II Computer.jpg
Compucolor II computer with Centronics 737 printer (Zagreb, 1980)
ManufacturerCompucolor Corporation
Release date1977[1]
Retail availability1977[2]-1980[3]
Units sold1000+[citation needed]
Operating systemCompucolor FCS
CPUIntel 8080/8080A
Memory8K, 16K, 32K
StorageProprietary Floppy Drive
Display13" color delta-gun CRT
InputProprietary parallel keyboard interface, modified EIA RS-232-C modem port, 50-pin custom bus.
ConnectivityEIA RS-232C
Power120 or 240 AC 50/60Hz
Online servicesIntelligent Systems Information Service
PredecessorISC 3620 Family
SuccessorISC 3621...

The Compucolor was an early color home computer product introduced in 1977 by Compucolor Corporation of Norcross, Georgia. It was a major product breakthrough in color graphics, text, and storage.

The Compucolor II initially was available at three price points: $1,395.00 (base), $1,595.00 (Extended), and $1,795.00 (Deluxe) in USD. The price difference was governed by the internal "User" memory. The "base" unit came equipped with 8 KB dynamic RAM, followed by "extended" as 16 KB, and then "Deluxe 32 KB". It was the first color home computer system with built-in color graphics, floppy-based data storage, and a specialized "QWERTY"-style keyboard.

Compucolor opened its first retail computer store in Norcross, Georgia USA in 1979. It was aptly named the "Compucolor Computer Store". The store had limited success in the six months of operation, and the store concept was abandoned.

By 1983, Compucolor was out of business. Follow-on Compucolor II home/office computers were manufactured by Intelligent Systems Corporation, also of Norcross, Georgia USA.

Details[edit]

The computer and integrated monitor were built into a standard General Electric (GE) 13" color television set cabinet. These cabinets were procured without TV components and modified to house a custom set of video analog electronics, digital board, and floppy drive.

The machine was based on the Intel 8080 operating at 1.99 MHz clock rate and used a SMC CRT5027 video controller programmed to provide the 64 character by 32 line screen format. Internal proprietary ROM firmware allowed a plot graphics array of 128 H by 128 V available in eight colors. Random access memory (RAM) was expandable in increments of 8 KB up to 32 KB.

Three available keyboards having 72 (standard), 101 (expanded), or 117 (deluxe) individual keys. which attached to the computer with a 25-pin ribbon cable. The keys were full-travel "Cherry brand" type having gold cross-bar contacts with excellent feel and reliability. Key tops were engraved with special legends to help manage computer functions.

The Compucolor II used a custom designed 51.2KB 5.25" floppy disk drive, which was placed on the right side of the monitor cabinet. The design utilized a serial interface and was referred to as the "Compucolor Drive" or "CD". There were reliability issues with this design since any variance in motor spindle speed would cause difficulty reading or writing floppy media. Also there were a few electromagnetic issues within the cabinet space that interfered with the floppy recording and read process.

The disk operating system known as "File Control System" or "FCS" was designed in-house. In FCS, when a file was deleted, the individual file would be removed from the file list volume and remaining data would be moved to fill sequential empty space, using the 4 KB portion of display video RAM as a transfer buffer memory. In modern-day terms, files would be automatically defragmented to prevent cross-linked files.

Software[edit]

A ROM-based BASIC was included as an improved and sub-licensed version of Microsoft BASIC. Compucolor Corporation took a few steps to improve BASIC. Compucolor Corporation worked closely with Microsoft Corporation, and a licensing agreement was agreed to in the best interest of both companies.

Most legally available software for the Compucolor II was written by in-house software programmers. Over 20 software titles were officially released by Compucolor with custom 5-1/4" artwork title covers: Air Raid, Othello, Blackjack, Bounce, Chess, Cubic Tic Tac Toe, Lunar Lander, Maze Master, Sharks, Shoot, Solitaire, Star Trader, Star Trip, and Swarms. There was also a groundswell of hobbyists and user groups who created software for sale or "shareware" among its groups.The most important title for the Compucolor II was probably a game called Star Trip which mimicked the Star Trek genre. Another line of game software was also marketed widely and included titles such as, Lightning Command, Target Omega, Freebooter and Bomb Squad.

References[edit]

  1. ^ ComputerCloset.org – Information about the Compucolor II
  2. ^ Old-Computers.com – Technical information
  3. ^ Jakobson, Cathryn. "The Man Who Never Wanted To Be President". Inc. Magazine. Retrieved 14 January 2017.


External links[edit]