Windows 1.0 Tandy 2000 builds

Windows 1.0 "Tandy 2000" builds are a pair of early pre-release builds of Windows 1.0 that were demonstrated on the Tandy 2000 Personal Computer. Photos of these builds running on said computer were featured in various computer magazines at the time. The main advantage of the Tandy 2000 version of Windows was its color support (thanks to the 2000's display adapter), as the PC version was still monochrome at the time.

Earlier build
The photo of this build can be seen in the infobox on the right and was originally published in the 1984-11 issue of the 80 Micro magazine, as well as several issue of Science & Vie Micro magazine. It reveals that it still had the status bar at the top of the screen (along with the system menu and help buttons).

The MS-DOS Executive was still called "DOS Window" at the time and had a different menu order. Calculator, Reversi, Color Demo, Puzzle and Sample Applications are running as well, while Clipboard is minimized. The bottom right corner features a "trash" icon that can be found in Development Release #5. The 1984-06-12 issue of PC Magazine mentions a "litter icon", which is used for discarding files, similar to the trash can on the Macintosh. It seems likely the icon in the photo was used for that purpose, before the feature was removed sometime between these two builds and DR5.

The DOS Window is displaying the list of files on the A: drive (floppy disk). Applications resources are stored in separate files, like in DR5, but the executable extension is  rather than. This extension has persisted in, which is a special system application that hosts DOS applications running under Windows in Alpha and later.

File list
 * : Color Demo application
 * : Calculator
 * : Clipboard
 * : The DOS command interpreter. Its presence suggests this may have been a bootable demo disk.
 * : Unknown, possibly storing Windows configuration?
 * : Probably related to the cursor routines part of the display driver in DR5 ( files)
 * : Probably the batch file that starts Windows and all the applications for demo purposes
 * : Probably the display driver ( files in DR5)
 * : Probably the system font ( files in later builds)
 * : The GDI component of the system, though it's unclear why there are three different executables for it
 * : The kernel executable
 * : The keyboard driver
 * : Unknown, possibly stores a keyboard layout of some kind?
 * : Unknown, the extension suggests this is actually a DOS application
 * : The mouse driver
 * : The Puzzle application
 * : Reversi
 * : Sample Application
 * : Unknown, possibly the DOS Window application (MS-DOS Executive)
 * : Unknown, clearly a Windows application, but with no associated resource file
 * : The system timer driver
 * : The User component of the system

Later build
The later build is shown in an ad for the Tandy 2000, featuring Bill Gates describing various advantages of Windows on the 2000. The ad was published in 1984-11 and 1984-12 issues of BYTE magazine, and the 1984-11-05 issue of InfoWorld magazine. While it appears very similar to the earlier build, there are some notable differences. The status bar at the top was gone by then, and button labels in the Calculator application are now vertically centered, rather than aligned to the bottom.

The minimized icon at the bottom is the Spread Sheet application seen in earlier builds. The DOS Window is again listing files on the A: drive, but this time there are also the following files:,   and  , suggesting the Calendar application from earlier builds was still present. It was later missing from DR5 and Alpha, returned in the May Beta, and was redesigned before the Premiere Edition.