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Browse Prior Art Database

Function Oriented Loosely Coupled Multimicroprocessor System for Printer Control

IP.com Disclosure Number: IPCOM000051118D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 48K

Publishing Venue

IBM

Related People

Barthel, JE: AUTHOR [+2]

Abstract

The functions to be performed by a printer control system are broken up according to function groups which are relatively independent of each other and can be executed by microprocessors requiring only little communication.

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Function Oriented Loosely Coupled Multimicroprocessor System for Printer Control

The functions to be performed by a printer control system are broken up according to function groups which are relatively independent of each other and can be executed by microprocessors requiring only little communication.

The printer control system schematically illustrated in the figure has a main processor system 1 with a read/write memory (RAM) and a read-only memory (ROM). This main processor is connected by a programmable input/output interface (PIO) to host system 2, on the one hand, and by bus adapter 3 and bidirectional bus 6 to control subsystem 4, on the other. Control subsystem 4 has three microprocessors 5a, 5b, 5c interconnected by a serial loop 7. One microprocessor 5a is attached to bidirectional bus 6 for communication with main processor 1.

The printer elements receive control signals from and transmit sense signals to the different processors as follows:

Hammer fire control 8, which actuates hammer drivers 9, is connected to bidirectional bus 6 and receives its control signals directly from main processor 1 which is sufficiently fast to supply these signals at a high rate. In addition, the main processor performs administration tasks and communicates with host 2.

Other real time processes, such as forms advance and print timing control, which require little interaction with the main processor, are assigned to microprocessors in control subsystem 4.

Microprocessor 5a operates as a subsystem controller (SSC) and transmits data between bidirectional bus 6 and serial loop 7, in addition to controlling mainte...