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. 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 (models 26-3134B, 26-3136B, and 26-3127B; 16 KB standard, 16 KB extended, and 64 KB 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 than the Commodore 64, and that Radio Shack was dedicated to the educational market while Commodore was not. Color Computer 3 (1986–1991) By 1985, Color Computer users worried that the company would abandon their computer in favor of the Tandy 1000. Tandy executive Ed Juge stated that year that "No home computer on the market today has the potential horsepower of the Color Computer ... we believe [it] also has a good future". On July 30, 1986, Tandy announced the Color Computer 3 at the Waldorf-Astoria Hotel in New York City. It came with which could be upgraded to 512 KB. The panel behind the keyboard and cartridge door plastic were changed from black to grey. The keyboard layout was revised, putting the arrow keys in a diamond configuration and adding CTRL, ALT, CLEAR, F1 and