Tandy Radio Shack TRS - 80 64K Color Computer 2 (CoCo 2) W/ Adapter
Item History & Price
| Reference Number: Avaluer:7043719 | model 2: trs-80 |
| Type: Home Computer | Model: TRS-80 |
| MPN: trs-80 II | Modified Item: No |
| Brand: Radio Shack / Tandy | Custom Bundle: No |
You are bidding on a TRS-80 64K Color Computer 2. This computer appears to have been barely used, and is in near perfect condition. It comes in its original packaging and includes the adapter to connect it to a TV, which is typical for computers of this vintage. Unfortunately I do not have the original documentation. It powers on but no additional testing was done.
The box is in fair condition with age & storage wear.This is a straight up auction with a low starting&n...bsp;price that will sell to the highest bidder. Use the shipping calculator to determine shipping costI am a long time seller, please check out my feedback and bid with confidence.
Description of the TRS-80 64K Color Computer 2 from Wikipedia
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 essentially 100% compatible with the previous generation. The deletion 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 offered in either 16K or 64K models (there was no 32K CoCo 2).[citation needed] 16K models use 16Kx1 DRAMs, but the chips are not the common 4116; they are instead 6665 chips (Radio Shack P/N 8040517), which uses only +5V power rather than the triple voltages used by the 4116. 64K models use standard 4164 chips.64K models of the CoCo 2 have a control register at $FFDE/$FFDF used to switch between the second 32K of RAM and the OS ROMs. If the ROMs were banked out, the entire 64K of system RAM could be accessed.Production was also partially moved to Korea during the CoCo 2's life-span, and many owners of the Korean-built systems referred to them as "KoKos". Production in the US and Korea happened in parallel using the same part numbers; very few, if any, differences exist between the USA built and Korean built CoCo 2 machines.Upgraded BASIC ROMs were also produced, adding a few minor features and correcting some bugs. A redesigned 5-volt disk controller was introduced with its own new Disk BASIC ROM (v1.1). The new controller also added a new command, "DOS", which allowed software to be auto-booted from disk (this required a disk that had a specially set up boot sector). It facilitated the use of software on copy protected disks or third-party operating systems, chiefly OS-9.Later in the production run, the "melted" keyboard was replaced with a new, full-travel, typewriter-style keyboard.The final significant change in the life of the CoCo 2 was made for the models 26-3134B, 26-3136B, and 26-3127B (16 KB standard, 16 KB extended, and 64 KB extended respectively). Internally this model was redesigned to use the enhanced VDG, the MC6847T1. This enhanced VDG allowed the use of lower case characters and the ability to change the text screen border color. For compatibility reasons neither of these features were used and were not enabled in BASIC, however the resourceful user could enable them by setting certain memory registers. Midway during the production run of these final CoCo 2s, 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 than the Commodore 64, and that Radio Shack was dedicated to the educational market while Commodore was not.[9]On Jul-21-19 at 19:24:59 PDT, seller added the following information:Since posting this computer I have learned that I mis-identified it as a CoCo 2. it is in fact a CoCo (1). Late in the production run of the model 1 all were "upgraded" to 64k RAM and that was added to the label on the top, this one is a 26-3003B as shown. My thanks to an eagle eyed eBay member for pointing that out to me.
One other note. The serial number on the unit (0010143) does not match the SN on the box (0003037) It is the box that I purchased the computer with but didn't notice the potential disparity (I say potential as the SN on the box was applied with a label) until another eBay member pointed that out to me. Many Thanks!
The box is in fair condition with age & storage wear.This is a straight up auction with a low starting&n...bsp;price that will sell to the highest bidder. Use the shipping calculator to determine shipping costI am a long time seller, please check out my feedback and bid with confidence.
Description of the TRS-80 64K Color Computer 2 from Wikipedia
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 essentially 100% compatible with the previous generation. The deletion 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 offered in either 16K or 64K models (there was no 32K CoCo 2).[citation needed] 16K models use 16Kx1 DRAMs, but the chips are not the common 4116; they are instead 6665 chips (Radio Shack P/N 8040517), which uses only +5V power rather than the triple voltages used by the 4116. 64K models use standard 4164 chips.64K models of the CoCo 2 have a control register at $FFDE/$FFDF used to switch between the second 32K of RAM and the OS ROMs. If the ROMs were banked out, the entire 64K of system RAM could be accessed.Production was also partially moved to Korea during the CoCo 2's life-span, and many owners of the Korean-built systems referred to them as "KoKos". Production in the US and Korea happened in parallel using the same part numbers; very few, if any, differences exist between the USA built and Korean built CoCo 2 machines.Upgraded BASIC ROMs were also produced, adding a few minor features and correcting some bugs. A redesigned 5-volt disk controller was introduced with its own new Disk BASIC ROM (v1.1). The new controller also added a new command, "DOS", which allowed software to be auto-booted from disk (this required a disk that had a specially set up boot sector). It facilitated the use of software on copy protected disks or third-party operating systems, chiefly OS-9.Later in the production run, the "melted" keyboard was replaced with a new, full-travel, typewriter-style keyboard.The final significant change in the life of the CoCo 2 was made for the models 26-3134B, 26-3136B, and 26-3127B (16 KB standard, 16 KB extended, and 64 KB extended respectively). Internally this model was redesigned to use the enhanced VDG, the MC6847T1. This enhanced VDG allowed the use of lower case characters and the ability to change the text screen border color. For compatibility reasons neither of these features were used and were not enabled in BASIC, however the resourceful user could enable them by setting certain memory registers. Midway during the production run of these final CoCo 2s, 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 than the Commodore 64, and that Radio Shack was dedicated to the educational market while Commodore was not.[9]On Jul-21-19 at 19:24:59 PDT, seller added the following information:Since posting this computer I have learned that I mis-identified it as a CoCo 2. it is in fact a CoCo (1). Late in the production run of the model 1 all were "upgraded" to 64k RAM and that was added to the label on the top, this one is a 26-3003B as shown. My thanks to an eagle eyed eBay member for pointing that out to me.
One other note. The serial number on the unit (0010143) does not match the SN on the box (0003037) It is the box that I purchased the computer with but didn't notice the potential disparity (I say potential as the SN on the box was applied with a label) until another eBay member pointed that out to me. Many Thanks!
