Windows 1.0/Development Release 1

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Development Release #1
Kernel version 1.0
CPU architecture x86 (16-bit)
Compile date May 1984

Development Release #1 is an early pre-release build of the Microsoft Windows 1.0 operating system, compiled sometime in May 1984. Only the Tandy 2000 variant of this build is currently known to exist, however, a PC-compatible variant of this build would've been shipped as well.


The Tandy 2000 was an Intel 80186-based computer. Since the 80186 processor was not fully compatible with the IBM PC and compatibles, this created compatibility issues dividing it from other machines of the time. The Tandy 2000 variant of this build was specifically designed for the Tandy 2000 personal computer, including the Intel 80186 processor and also the high resolution graphics (640x400 screen resolution at 16 colors) used by the machine itself.

This build was launched from a file called DEMO.BAT and was intended to be run from a single 5,25" floppy disk. This loaded a copy of Windows with several sample applications which could easily be loaded from there.

It is also visible that this build uses the .MOD extension for applications, and thus predates the NE executable format. This remains until Development Release #5.

File list

File list (as seen in the DOS Window)

  • BOXES.MOD/BOXES.RES - Boxes application
  • CALC.MOD/CALC.RES - Calculator application
  • CLIP.MOD/CLIP.RES - Clipboard application
  • COMMAND.COM - Microsoft MS-DOS command interpreter
  • CONFIG.BIN - The system configuration file
  • CURSOR.MOD - The Cursor Routines file
  • DEMO.BAT - A batch file used to launch the Microsoft Windows demonstration
  • DISPLAY.MOD - Display driver
  • FONT.RES - Font resources
  • GDI.MOD - GDI (Graphics Device Interface) system file
  • GDI16.MOD - GDI (Graphics Device Interface) 16-bit system file
  • GDI8.MOD - GDI (Graphics Device Interface) 8-bit system file
  • KERNEL.MOD - Microsoft Windows kernel system file
  • KEYBOARD.MOD - Keyboard system file
  • KEYNAMES.BIN - Input translation table lookup file
  • MB.EXE - Module boot
  • MOUSE.MOD - Mouse driver
  • PUZZLE.MOD/PUZZLE.RES - Puzzle application
  • REVERSI.MOD/REVERSI.RES - Reversi application
  • SAMPLE.MOD/ SAMPLE.RES - Sample application
  • SHELL.MOD/SHELL.RES - "DOS Window" shell application (later became MS-DOS Executive (MSDOS.EXE)
  • TEST.MOD - Test executable file
  • TIMER.MOD - System timer driver
  • WINDOWS.MOD/WINDOWS.RES - Microsoft Windows User component