Browse Prior Art Database

System/9370 I/O Bus to Micro Channel Attachment

IP.com Disclosure Number: IPCOM000102101D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 3 page(s) / 97K

Publishing Venue

IBM

Related People

Boguski, MJ: AUTHOR [+5]

Abstract

Typically, the System/9370 family of processors are connected to their I/O via an I/O Processor (IOP) and I/O adapter (IOA) hardware. The System/9370 I/O devices are efficient for midrange applications, however, they are not well suited for low-end system applications due to the high cost and large physical size.

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

System/9370 I/O Bus to Micro Channel Attachment

       Typically, the System/9370 family of processors are
connected to their I/O via an I/O Processor (IOP) and I/O adapter
(IOA) hardware.  The System/9370 I/O devices are efficient for
midrange applications, however, they are not well suited for low-end
system applications due to the high cost and large physical size.

      In recent times, as the personal computer's architecture and
performance has gained acceptance in the small business world and as
scientific work stations, the need for the connectivity between
midrange and low-end systems has been increased.

      The PS/2* model 80, designed with Intel 80386 microprocessor,
conforming to MICRO CHANNEL* architecture is well suited to low-end
system applications.  The DASD, terminals and printers it supports
are relatively low cost with high performance.  Thus, the PS/2 model
is very attractive to use as an I/O processor for a System/9370.

      This article discusses a unique and simple method of attaching
a PS/2 model 80 to a System/9370 processor designed to interface with
System 9370 I/O.  This hardware adapter plugs in the MICRO CHANNEL
and connects to the System/9370 via a cable.  The hardware employs
off-the- shelf components that are used in 9370 IOPs and standard
vendor components.  The main components are:
           Motorola 68000 microprocessor
           System 9370 IO bus/M68000 bus adapter (BASE-Z)
           High speed message and data buffer
           M68450 DMA controller
           Buffer/Control storage
           MICRO CHANNEL control and data steering logic

      The hardware shown in the figure basically functions as a "data
mover" between the System/9370 storage and a MICRO CHANNEL bus
master.  The primary function of the on board M68000 microprocessor
is to control the data traffic efficiently between System/9370
storage and the PS/2.  The M68000 control program resides in control
storage.  The buffer storage is dual ported between the M68000 and
PS/2. The control logic...