Browse Prior Art Database

Environment Facility Supporting Logical Device Units

IP.com Disclosure Number: IPCOM000119930D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Cox, D: AUTHOR [+2]

Abstract

This article describes a concept of supporting Logical Device Units (LDUs) through Device Drivers in OfficeVision*/MVS (OV/MVS). In OS/2* there is the ability to support Logical Device Drivers or Logical Device Units. A Device Driver consists of code that may be installed to manage or emulate a Logical Device. It provides the ability for the Operating System to support devices other than those supplied by the original manufacturer. The Device Driver provides the capability to support physical or logical devices, such as physical board on a PS/2* or a logical memory reporter. It offers greater capability to the user than the normal operating system user exit. The interface to the device driver provides the definition of the device, the protocol of the device, and the device address.

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This is the abbreviated version, containing approximately 52% of the total text.

Environment Facility Supporting Logical Device Units

      This article describes a concept of supporting Logical
Device Units (LDUs) through Device Drivers in OfficeVision*/MVS
(OV/MVS).  In OS/2* there is the ability to support Logical Device
Drivers or Logical Device Units. A Device Driver consists of code
that may be installed to manage or emulate a Logical Device. It
provides the ability for the Operating System to support devices
other than those supplied by the original manufacturer. The Device
Driver provides the capability to support physical or logical
devices, such as physical board on a PS/2* or a logical memory
reporter. It offers greater capability to the user than the normal
operating system user exit. The interface to the device driver
provides the definition of the device, the protocol of the device,
and the device address. The Operating System provides the definition
of how the user is to interface to the device through the operating
system using the IO control interface. It enables the operating
system to set tuning regardless of the device type. It allows the
user to load only the device drivers needed on that system.

      The goal is to provide equivalent function for device drivers
for logical device units in OV/MVS. OV/MVS is not an operating system
so it cannot provide device drivers for physical devices. However it
does provide a platform for Office and other Services that have
counterparts on the OfficeVision/2* (OV/2) platform. The solution
consists of three parts. The first is to provide an interface portion
for the applications running on the Office Platform.  This means that
when an applicatio...