FILE 3.5

The DEVICE File (#3.5) is stored in the global root of ^%ZIS(1, and each entry corresponds to a name for I/O (Input and Output) in the VistA system. Generally speaking characters are sent to and received from an I/O device in most computer systems as a normal part of interaction with a user.

The devices in VistA are segmented by the TYPE Field which has the following values:

**INTERNAL ABBREVIATION**	**EXTERNAL VALUE**	**Intended use**
TRM	TERMINAL	hard connected terminals such as consoles
OTH	OTHER
MT	MAGTAPE	sequential magnetic tape
SDP	SDP	unused- was Sequential Disk Processing - MUMPS-as-OS disk storage
SPL	SPOOL	unused - was in-MUMPS disk/printer spooling
BAR	BARCODE READER
HFS	HOST FILE SERVER	commonly used - filesystem storage, print spooling, etc.
VTRM	VIRTUAL TERMINAL	soft connect terminals over the network
HG	HUNT GROUP	providing for banks of "alike" devices
RES	RESOURCES	synchronization and limiting background processes
CHAN	NETWORK CHANNEL	devices attached with TCP/IP addresses and ports
IMPC	IMAGING WORK STATION