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Browse Prior Art Database

Method of Simulating Asynchronous Serial Devices

IP.com Disclosure Number: IPCOM000045432D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Nielsen, LR: AUTHOR

Abstract

During the development of a printer, the multi-function adapter card was under development and unavailable to be used to drive the printer from the host processor. However, in order to drive the printer conventional adapter cards and specialized host processing routines simulating the multi-function adapter card were developed. The exerciser program was designed to run with either the multi-function adapter card or the conventional card in a simulation mode.

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Method of Simulating Asynchronous Serial Devices

During the development of a printer, the multi-function adapter card was under development and unavailable to be used to drive the printer from the host processor. However, in order to drive the printer conventional adapter cards and specialized host processing routines simulating the multi-function adapter card were developed. The exerciser program was designed to run with either the multi-function adapter card or the conventional card in a simulation mode.

In the multi-function adapter mode, the exerciser program operates using the normal host I/O handling techniques. The asynchronous serial connection and the protocol between the multi-function adapter and the printer are handled on the host end by the multi-function adapter card itself and its internal microprocessor. In the conventional card simulation mode, the same host exerciser program is used, but the commands to the printer are passed to the host routines that emulate the multifunction adapter card's microprocessor and simulate the protocol and communication with the printer via the conventional adapter card. Character redundancy check operations are performed and tested as well as protocol sequences verified, error conditions detected, exception conditions caused to verify proper printer operations, and time out delays tested by using the timer features of the host. All of these functions are easily performed with the software program in the host.

The p...