This chapter describes the OS specific parts of OTP which relate to Windows NT.

## Introduction

A normal installation of NT 4.0, with service pack 4 or later, is required for an embedded Windows NT running OTP.

## Memory Usage

RAM memory of 96 MBytes is recommended to run OTP on NT. A system with less than 64 Mbytes of RAM is not recommended.

## Disk Space Usage

A minimum NT installation with networking needs 250 MB, and an additional 130 MB for the swap file.

## Installation

Normal NT installation is performed. No additional application programs are needed, such as Internet explorer or web server. Networking with TCP/IP is required.
Service pack 4 or later must be installed.

### Hardware Watchdog

For Windows NT running on standard PCs with ISA and/or PCI bus there is a possibility to install an extension card with a hardware watchdog.

See also the heart(3) reference manual page in Kernel.

## Starting Erlang

On an embedded system, the erlsrv module should be used, to install the erlang process as a Windows system service. This service can start after NT has booted. See documentation for erlsrv.