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Color Computer 2, Radio Shack TRS-80 Tandy CoCo (As-Is) #17878
Appearance: Used
Functionality: Not Working
Description:
============
As pictured, a Radio Shack TRS-80 Color Computer 2. Includes just the main unit – no other accessories are available. Unit does not power on – sold as-is.
Warranty and Returns:
=====================
This product is being sold AS-IS without any warranty. Returns are not accepted. To ensure that this is the right product for your needs, we’re happy to answer any questions.
Shipping:
=========
- Other shipping methods are available – contact us for details.
- Combined shipping is available for most items – contact us for details.
- Local pickup is also available at no cost.
About Us:
=========
The Computer Preservation Group is dedicated to the preservation of historical computers. To help fund ongoing operations, select items are made available. To learn more, please visit our website. Thank you for your support!
Stock#:J0363.GP#7
Details from https://en.wikipedia.org/wiki/TRS-80_Color_Computer:
Color Computer 2 (1983–1986)
Tandy Color Computer 2
Final production 64K model (26-3127B)
Developer Tandy Corporation
Manufacturer Motorola
Release date 1983; 41 years ago
Introductory price US$159 (equivalent to $490 in 2023)
Operating system Color BASIC / OS-9 Level 1 with disk-drives
CPU 6809E @ 0.895 MHz
Memory 16 / 32 / 64 KB
Graphics MC6847 video display generator
Sound 6-bit DAC
Backward
compatibility Tandy Color Computer 1
Predecessor Tandy Color Computer 1
Successor Tandy Color Computer 3
During the initial CoCo 1 production run, much of the discrete support circuitry had been re-engineered into a handful of custom integrated circuits, leaving much of the circuit board area of the CoCo 1 as empty space. To cut production costs, the case was shortened by about 25% and a new, smaller power supply and motherboard were designed. The "melted" keyboard from the white CoCo 1 and the TDP-100 style ventilation slots were carried over. Aside from the new look and the deletion of the 12 volt power supply to the expansion connector, the computer was compatible with the previous generation. The removal of the 12V power supply crippled some peripherals such as the original floppy disk controller, which then needed to be upgraded, installed in a Multi-Pak interface, or supplied with external power.
The CoCo 2 was sold in 16K and 64K models. 16K models use 16Kx1 DRAMs, but the chips are not the common 4116; they were instead 4517s (Radio Shack P/N 8040517),[10] which use only +5V power rather than the triple voltages used by the 4116. 64K models use standard 4164 chips and have a control register at $FFDE/$FFDF to switch between the second 32K of RAM and the OS ROMs. With the ROMs banked out, the entire 64K of system RAM can be accessed.
Upgraded BASIC ROMs add minor features and fix some bugs. A redesigned 5-volt disk controller was introduced with its own new Disk BASIC ROM (v1.1). It adds a new command, DOS, to auto-boot software from disk (this requires a disk with a special boot sector). This allows the use of software on copy protected disks or third-party operating systems, chiefly OS-9.
Production was partially moved to Korea, with production in the US and Korea happening in parallel using the same part numbers.
Around March 1984, Radio Shack began advertising a 64K version of the CoCo 2 which also included an 'enhanced' full-travel, typewriter-style keyboard in the production run,[11] replacing the previous "melted" keyboard.
The final significant change in the life of the CoCo 2 (models 26-3134B, 26-3136B, and 26-3127B; 16K standard, 16K extended, and 64K extended respectively) was to use the enhanced VDG, the MC6847T1, allowing lowercase characters and changing the text screen border color. These features were not enabled in BASIC. Midway during the production run of these models, the nameplate was changed from "Radio Shack TRS-80 Color Computer 2" to "Tandy Color Computer 2". The red, green, and blue shapes were replaced with red, green, and blue parallelograms.
Creative Computing wrote in December 1984 that the Color Computer was the best educational computer under $1000. The magazine said that it had fewer but better-quality educational software titles than the Commodore 64, and that Radio Shack was dedicated to the educational market while Commodore was not.[12]
Functionality: Not Working
Description:
============
As pictured, a Radio Shack TRS-80 Color Computer 2. Includes just the main unit – no other accessories are available. Unit does not power on – sold as-is.
Warranty and Returns:
=====================
This product is being sold AS-IS without any warranty. Returns are not accepted. To ensure that this is the right product for your needs, we’re happy to answer any questions.
Shipping:
=========
- Other shipping methods are available – contact us for details.
- Combined shipping is available for most items – contact us for details.
- Local pickup is also available at no cost.
About Us:
=========
The Computer Preservation Group is dedicated to the preservation of historical computers. To help fund ongoing operations, select items are made available. To learn more, please visit our website. Thank you for your support!
Stock#:J0363.GP#7
Details from https://en.wikipedia.org/wiki/TRS-80_Color_Computer:
Color Computer 2 (1983–1986)
Tandy Color Computer 2
Final production 64K model (26-3127B)
Developer Tandy Corporation
Manufacturer Motorola
Release date 1983; 41 years ago
Introductory price US$159 (equivalent to $490 in 2023)
Operating system Color BASIC / OS-9 Level 1 with disk-drives
CPU 6809E @ 0.895 MHz
Memory 16 / 32 / 64 KB
Graphics MC6847 video display generator
Sound 6-bit DAC
Backward
compatibility Tandy Color Computer 1
Predecessor Tandy Color Computer 1
Successor Tandy Color Computer 3
During the initial CoCo 1 production run, much of the discrete support circuitry had been re-engineered into a handful of custom integrated circuits, leaving much of the circuit board area of the CoCo 1 as empty space. To cut production costs, the case was shortened by about 25% and a new, smaller power supply and motherboard were designed. The "melted" keyboard from the white CoCo 1 and the TDP-100 style ventilation slots were carried over. Aside from the new look and the deletion of the 12 volt power supply to the expansion connector, the computer was compatible with the previous generation. The removal of the 12V power supply crippled some peripherals such as the original floppy disk controller, which then needed to be upgraded, installed in a Multi-Pak interface, or supplied with external power.
The CoCo 2 was sold in 16K and 64K models. 16K models use 16Kx1 DRAMs, but the chips are not the common 4116; they were instead 4517s (Radio Shack P/N 8040517),[10] which use only +5V power rather than the triple voltages used by the 4116. 64K models use standard 4164 chips and have a control register at $FFDE/$FFDF to switch between the second 32K of RAM and the OS ROMs. With the ROMs banked out, the entire 64K of system RAM can be accessed.
Upgraded BASIC ROMs add minor features and fix some bugs. A redesigned 5-volt disk controller was introduced with its own new Disk BASIC ROM (v1.1). It adds a new command, DOS, to auto-boot software from disk (this requires a disk with a special boot sector). This allows the use of software on copy protected disks or third-party operating systems, chiefly OS-9.
Production was partially moved to Korea, with production in the US and Korea happening in parallel using the same part numbers.
Around March 1984, Radio Shack began advertising a 64K version of the CoCo 2 which also included an 'enhanced' full-travel, typewriter-style keyboard in the production run,[11] replacing the previous "melted" keyboard.
The final significant change in the life of the CoCo 2 (models 26-3134B, 26-3136B, and 26-3127B; 16K standard, 16K extended, and 64K extended respectively) was to use the enhanced VDG, the MC6847T1, allowing lowercase characters and changing the text screen border color. These features were not enabled in BASIC. Midway during the production run of these models, the nameplate was changed from "Radio Shack TRS-80 Color Computer 2" to "Tandy Color Computer 2". The red, green, and blue shapes were replaced with red, green, and blue parallelograms.
Creative Computing wrote in December 1984 that the Color Computer was the best educational computer under $1000. The magazine said that it had fewer but better-quality educational software titles than the Commodore 64, and that Radio Shack was dedicated to the educational market while Commodore was not.[12]
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