Browse Prior Art Database

Method to Provide Asynchronous Redirection for the Ibm RT-PC

IP.com Disclosure Number: IPCOM000039264D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Blackard, JW: AUTHOR [+4]

Abstract

A PC application running on a 80286 co-processor card on certain models of RT-PC cannot perform asynchronous I/O without a serial/parallel adapter card installed in the machine. The new method provides a translation function which redirects asynchronous I/O between the 80286 co-processor and the asynchronous serial ports on the native planar (Zilog 8530 processor) instead of to the serial/parallel adapter. The two serial asynchronous ports on the planar may be used for serial asynchronous I/O by translating all commands and data to the 8530 processor format. This allows the customer to run PC applications without purchasing a serial/parallel adapter. The figure illustrates where I/O, which would normally go to the serial/parallel adapter, is trapped by the hardware on the co-processor card.

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Method to Provide Asynchronous Redirection for the Ibm RT-PC

A PC application running on a 80286 co-processor card on certain models of RT-PC cannot perform asynchronous I/O without a serial/parallel adapter card installed in the machine. The new method provides a translation function which redirects asynchronous I/O between the 80286 co-processor and the asynchronous serial ports on the native planar (Zilog 8530 processor) instead of to the serial/parallel adapter. The two serial asynchronous ports on the planar may be used for serial asynchronous I/O by translating all commands and data to the 8530 processor format. This allows the customer to run PC applications without purchasing a serial/parallel adapter. The figure illustrates where I/O, which would normally go to the serial/parallel adapter, is trapped by the hardware on the co-processor card. This trapped address and accompanying information is passed to the co-processor device driver in the VRM where it is translated and redirected to the native planar ports. This eliminates the need for the serial/parallel adapter.

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