Browse Prior Art Database

Interface Between Data Processing Control Unit and Word Processor Display

IP.com Disclosure Number: IPCOM000042129D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Hunt, GT: AUTHOR [+3]

Abstract

Technology wherein a display terminal of a word processing system is utilized for the display of data from a data processor transmitted to the terminal from the data processor multiplexing control unit is a developing technology. In the transmission of data from the control unit to the word processor display terminal, the link protocols may often have strict timing requirements. In one system, there are two major types of commands, those that deal directly with the reading or writing of data to memory or registers of the display terminal, and those that require a high level function. All commands require an immediate response within 5.5 microseconds. The high level commands require a different response when completed, within 32 milliseconds. The original intent was for software to do all processing of high level commands.

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Interface Between Data Processing Control Unit and Word Processor Display

Technology wherein a display terminal of a word processing system is utilized for the display of data from a data processor transmitted to the terminal from the data processor multiplexing control unit is a developing technology. In the transmission of data from the control unit to the word processor display terminal, the link protocols may often have strict timing requirements. In one system, there are two major types of commands, those that deal directly with the reading or writing of data to memory or registers of the display terminal, and those that require a high level function. All commands require an immediate response within 5.5 microseconds. The high level commands require a different response when completed, within 32 milliseconds. The original intent was for software to do all processing of high level commands. The most time consuming event of some of these commands was a search of memory for a particular pattern. This was needed for the following commands: 'search forward', 'search backward', 'insert', and 'clear'. These commands are relatively complex, and the available software could not complete them within the timing requirements. To support the software, hardware was incorporated which was configured as shown in Fig. 1. The interface logic can request and gain access to the private bus and read from or write into memory. Since this capability is part of a normal operation,...