Browse Prior Art Database

Host Triggered Device Response Time Measurement

IP.com Disclosure Number: IPCOM000050131D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Troan, LE: AUTHOR

Abstract

This mechanism allows measurement of the time between a host computer simulated "attention operation" and the host "applications" response without operator intervention.

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Host Triggered Device Response Time Measurement

This mechanism allows measurement of the time between a host computer simulated "attention operation" and the host "applications" response without operator intervention.

The illustrated computer system includes a host computer 10 containing one or more applications, connected through a local or teleprocessing network 18 to one or more controllers 12, which in turn are connected by respective transmission lines 20 to displays 14 with host attention generating input devices (keyboard, "selector" pen, magnetic reader, etc.) 16.

Response time measurement techniques typically involve measuring the time from an operator operation using an input device 16. The resulting attention is transmitted to the controller 12 and through the network 18, to the host computer
10. The host then responds to this attention and transmits a message back through the network 18 to the controller 12 back to the display 14. This has two negative aspects: an operator is required to initiate the measurement, and any general host response could terminate it.

With this mechanism, the target device 14 is placed in a unique response time measurement mode, either via a command from the host 10 or by a local control unit 12 option. The host 10 then sends a special command to the device
14. Receipt of the command by the device 14 generates an inbound request and starts the response time measurement.

When the host 10 receives this request, another comman...