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GUIDE TO WRITING
DEVICE DRIVERS FOR THE
iRMX 86TM I/O SYSTEM
Manual Order Number: 142926-002
Copyright @ 1981, Intel Corporation
I Intel Corporation, 3065 Bowers Avenue, Santa Clara, California 95051 I
REVISION HISTORY PRINT
REV.
DATE
-001 Original Issue 11/80
-002 Updated to reflect the changes in 5/81
version 3.0 of the iRMX 86 software.
Additional copies of this manual or other Intel literature may be obtained from:
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Intel Corporation assumes no responsibility for any errors that may appear in this document.
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contained in this document.
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ii
PREFACE
The I/O System is the part of the iRMX 86 Operating System that provides
you with the capability to access files on peripheral devices. It is
implemented as a set of file drivers and a set of device drivers. A file
driver provides user access to a particular type of file, independent of
the device on which the file resides. A device driver provides a
standard interface between a particular device and one or more file
drivers. Thus, by adding device drivers, your application system can
support additional types of devices. And it can do this without changing
the user interface, since the file drivers remain unchanged.
This manual describes how to write device drivers to interface with the
I/O System. It illustrates the basic concepts of device drivers in an
iRMX 86 environment and describes the different types of device drivers
(common, random access, and custom).
READER LEVEL
This manual assumes that you are a system programmer experienced in
dealing with I/O devices. In particular, it assumes that you are
familiar with the following;