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Making a Data Processing System Compatible With Commercially Available Integrated Circuit Processors

IP.com Disclosure Number: IPCOM000041581D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Allen, WH: AUTHOR [+4]

Abstract

A great many data processing systems now utilize a plurality of commercially available integrated circuit processors. In utilizing such commercially available processors, compatibility problems with respect to the data processing system may arise such as the order in which the processor stores information. For example, a well-known, commercially available processor stores information in byte-reverse order, i.e., a two-byte word will be stored with the last byte first. If the data processing system in which the processor is used is designed to utilize the bytes in direct order, the system must provide expedients for correcting this. In the case where the system controls a printer, we can readily offset the above problem by sending the commands to the printer in the reverse of the stored order.

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Making a Data Processing System Compatible With Commercially Available Integrated Circuit Processors

A great many data processing systems now utilize a plurality of commercially available integrated circuit processors. In utilizing such commercially available processors, compatibility problems with respect to the data processing system may arise such as the order in which the processor stores information. For example, a well-known, commercially available processor stores information in byte-reverse order, i.e., a two-byte word will be stored with the last byte first. If the data processing system in which the processor is used is designed to utilize the bytes in direct order, the system must provide expedients for correcting this. In the case where the system controls a printer, we can readily offset the above problem by sending the commands to the printer in the reverse of the stored order. This will involve no additional steps but will provide the command to the printer in the correct order required by the printer.

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