Browse Prior Art Database

Device Independent Printer Attachment

IP.com Disclosure Number: IPCOM000089477D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Callahan, RW: AUTHOR

Abstract

In many cases it is desirable to attach a moderate speed line printer to a service processor as a system printer. Existing software support to drive the printer as the system printer is desired, but is not always possible, since in many cases the desired printer is a terminal printer that may have data formatted in a manner quite different from that of the existing software support. With the approach described below, it is possible to connect any printer having a suitable support processor to the basic system using the existing software support as the system printer.

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Device Independent Printer Attachment

In many cases it is desirable to attach a moderate speed line printer to a service processor as a system printer. Existing software support to drive the printer as the system printer is desired, but is not always possible, since in many cases the desired printer is a terminal printer that may have data formatted in a manner quite different from that of the existing software support. With the approach described below, it is possible to connect any printer having a suitable support processor to the basic system using the existing software support as the system printer.

The overall schematic configuration of such an approach, as shown in the figure, includes the system processor 11 having inherent software and microcode support. Attached to the processor is the IC bus 13 to which the support processor 15 is connected by the PIO bus 17 and the bus-to-bus adapter 19. The printer 21 is connected via a device cluster adapter (DCA) 23 through the PIO bus 17 to the support processor 15. As illustrated by the dotted line identified by the circled B, there is a newly defined interface to which the printer subsystem architecturally operates. The support processor 15 maintains a device control block for each printer or other device attached to the DCA 23.

The support processor 15 is able to accept commands from the processing unit 11, decode and translate these commands, and transmit them and data to the printer 21. It also accepts and pr...