Message Distribution Service

NetPlane Core Services

 

 

The following table lists and briefly describes complementary NCS services which were developped by Motorola.

Table 2-2 Motorola-Complementary NCS Services

NCS Service Name

Description

 

 

Distributed Trace

This service allows clients to direct debug information to a file for later

Service (DTSv)

analysis.

 

 

HPI Integration Service

This services allows other NCS services to access HPI events and to

(HISv)

invoke a limited set of HPI functions.

 

 

Simple Software

This service facilitates node-scoped software upgrade procedures for net-

Upgrade (SSU)

booted and disk-bladed nodes.

 

 

System Resource

This service oversees system resource utilization by applications and

Monitoring Service

notifies those applications of resource utilization events.

(SRMSv)

 

 

 

Persistent Store Service

This services tracks and makes persistent, successful changed

(PSSv)

configuration settings accomplished through the Management Access

 

Service. The stored, persistent information may be used by a component

 

when it is restarted.

 

 

Management Access

This service provides a client with a single interface for different kinds of

Service (MASv)

management operations. The supported management methods include

 

SNMP, Command Line Interface (CLI) and XML.

 

 

Message Based

This service provides message-based checkpointing between an active

Checkpointing Service

and one or more stand-by components.

(MBCSv)

 

 

 

Interface Service (IfSv)

This service oversees and coordinates the management and distribution

 

of system-wide interface information. This includes support for virtual IP

 

features and the MIB II interface group.

 

 

Further details about these services will be given in the following sections.

2.1.2Message Distribution Service

The Message Distribution Service (MDS) provides high-performance, reliable message distribution services. NCS services and user applications invoke the services provided by MDS through an API which is exposed in the form of a library that can be linked to a process. MDS supports intra-process, inter-process as well as inter-node communication. Further details about MDS will be given in section 2.7 of this manual.

2.1.3LEAP Portability Layer

LEAP stands for Layered Environment for Accelerated Portability. It is an operating system abstraction that provides portability to both NCS services and user applications from underlying operating system specifics and provides many value-added features. Further details are given in section 2.8 of this manual.

NetPlane Core Services Overview User’s Guide (6806800C08B)

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Motorola 6806800C08B manual Message Distribution Service, Leap Portability Layer, NCS Service Name Description

6806800C08B specifications

The Motorola 68000 microprocessor, particularly the revision marked as 68000C08B, stands out as a seminal component in the evolution of computing technology. Introduced in 1979, the 68000 architecture laid the groundwork for many advanced systems, influencing a multitude of platforms, from personal computers to game consoles.

The Motorola 68000C08B features a 16-bit data bus and a 24-bit address bus, allowing for a memory addressing capability of up to 16 MB. This architecture was pioneering for its time, enabling more extensive and complex software applications than its predecessors. The C08 revision particularly emphasized optimizing power consumption while maintaining performance, making it ideal for embedded systems and portable devices.

One of the 68000's key characteristics is its unique register set, which allows for a versatile range of operations. It consists of 8 general-purpose data registers and 8 address registers. The architecture supports both integer and floating-point operations, thanks to an integrated instruction set that facilitates complex mathematical computations, crucial for applications in graphics and gaming.

In terms of performance, the 68000 processor operates at clock speeds ranging from 8 MHz to 16 MHz, depending on the specific variant. The instruction set architecture (ISA) is known for its orthogonality, meaning that most instructions can be used interchangeably across different registers. This design simplicity allows for efficient coding and faster execution times, a significant advantage for developers.

Another remarkable feature of the 68000C08B is its capability for multitasking and improved context switching. Its advanced memory management, combined with support for virtual memory in later implementations, catered to the needs of operating systems and real-time applications, making it suitable for both consumer electronics and industrial machinery.

The Motorola 68000 family also supports a variety of peripherals, enhancing its flexibility as a microcontroller. This compatibility allowed manufacturers to create diverse product lines, from keypads and mice to modems and hard drives.

In summary, the Motorola 68000C08B microprocessor not only advanced the landscape of computer technology in the late 20th century but also helped set the stage for future innovations through its architecture, performance capabilities, and versatility in numerous applications. Its legacy continues to influence modern computing paradigms, ensuring the 68000 remains an essential chapter in the history of microprocessors.