Windows NT 3.1 build 239

1.239
	Build of Windows NT 3.1
OS family	Windows NT
Build number	239
Architecture	x86, MIPS
Compiled on	1991-12-21
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Windows NT 3.1 build 239 is the December 1991 build of Windows NT 3.1. Like in earlier builds, Sound Blaster configuration is hardcoded for I/O port 0x260 and IRQ 7.

New features and changes[edit | edit source]

The color palette has been changed back to a more vivid one used by Windows 3.1 and build 196 as opposed to the older Windows 3.0 palette used by the October build.

The Video 7 VGA driver now also supports 1024x768 at 16 colors as opposed to only 800x600.

MIPS compile[edit | edit source]

This is the earliest available build of NT for the MIPS architecture. Due to its earliness a custom ARC firmware ROM image^[1] must be used otherwise the installer and boot loader will crash or exit. The build will boot in QEMU but due to requiring G300 graphics (G364 is what is emulated) will not show any UI. In MAME the build can install successfully (despite emulating the "wrong" graphics card) but the boot entry is incomplete and needs to be fixed in ARC firmware setup after installation.

File differences[edit | edit source]

The following files have been introduced or removed compared to the October 1991 build:

Added files
Name	Description	Version
256COLOR.BMP
ARCADE.BMP
ARCHES.BMP
ARGYLE.BMP
BOWSER.SYS
CARS.BMP
CASTLE.BMP
CHITZ.BMP
CPUTHERM.EXE
DLGEDIT.HLP
EDITHLP.HLP
EGYPT.BMP
FD845.SYS
FLOCK.BMP
HONEY.BMP
IMAGEDIT.HLP
LEAVES.BMP
MARBLE.BMP
NTLANMAN.DLL
PORTTOOL.EXE
PSTAT.EXE
REDBRICK.BMP
RIVETS.BMP
SLASH.BMP
SPOTS.BMP
SQUARES.BMP
SSBEZIER.SCR
STEEL.BMP
TARTAN.BMP
THATCH.BMP
WIN32API.DAT
WINLOGO.BMP
WINMETA.H
WINPERF.EXE
WINVER.H
ZIGZAG.BMP
ZOOMIN.EXE