## 2 Windows NT

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

### 2.1 Introduction

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

### 2.2 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.

### 2.3 Disk Space Usage

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

### 2.4 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.

#### 2.4.1 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.

### 2.5 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`.

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