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 several computer magazines at the time. The main advantage of the Tandy 2000 version of Windows was its color support (thanks to the Model 2000's above-average 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 issues of 80 Micro and Microcomputing magazines, as well as several issues of Science & Vie Micro magazine from 1985. This build still had the status bar at the top of the screen, along with the system menu and help buttons.

The MS-DOS Executive was called "DOS Window" at the time and had a different menu order. Calculator, Reversi, Color Demo, Puzzle and Sample Applications (later renamed to Template application) were running as well, while Clipboard was minimized. The bottom right corner featured a "trash" icon that can be found in Development Release #5. The 1984-06-12 issue of PC Magazine mentions a "litter icon", which was used for discarding files, similar to the trash can feature 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 Clipboard icon is also slightly different than in DR5. The labels on the squares in Puzzle application sit lower than in DR5, as do labels on the buttons in Calculator.

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
 * : Boxes
 * : Calculator
 * : Clipboard
 * : MS-DOS command interpreter, its presence suggests this may have been a bootable demo disk
 * : Unknown, also present and used by  in DR5
 * : The Cursor Routines executable ( in DR5)
 * : Presumably the batch file that starts Windows and all the applications for demo purposes
 * : The display driver ( in DR5)
 * : Presumably the resource file containing system fonts ( files in later builds)
 * : The GDI component of the system, unclear why there are three different executables and what each one does
 * : The kernel executable
 * : The keyboard driver
 * : This file is also present in DR5 and is used by the Resource Compiler
 * : Unknown, a DOS application based on the extension, possibly used to load . DR5 has a symbol table for it  which hints it is indeed a loader for   files
 * : The mouse driver
 * : Puzzle
 * : Reversi
 * : Sample Application, later renamed to Template Application in DR5
 * : DOS Window, later renamed to MS-DOS Executive, though a few internal  strings remain
 * : 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 the Model 2000 and various advantages of developing and using Windows on it. 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 which suggest this build is newer than the previous one.

The status bar at the top was gone and button labels in the Calculator application are now vertically centered like in DR5, rather than aligned to the bottom like in the earlier build. The minimized icon at the bottom is the Spread Sheet application seen in various earlier builds. The DOS Window is again listing files on the A: drive, but this time there are also the following files that are not listed in the previous build:,   and. These are probably files of the old Calendar application from previous builds, which was removed by the time DR5 was made and returned in the May Beta, but was then redesigned before the Premiere Edition.