Browse Prior Art Database

PC at Simulator Diskette Sharing With AIX

IP.com Disclosure Number: IPCOM000035893D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 4 page(s) / 204K

Publishing Venue

IBM

Related People

Blackard, JW: AUTHOR [+4]

Abstract

A method is described to allow the PC AT Simulator to share the diskette devices with other AIX processes. The PC AT Simulator is an application written to run on the IBM RT PC* on top of AIX*. AIX is the multitasking, multiuser operating system which runs on the RT PC. The RT has a RISC (reduced instruction set computer) 32-bit processor.

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PC at Simulator Diskette Sharing With AIX

A method is described to allow the PC AT Simulator to share the diskette devices with other AIX processes. The PC AT Simulator is an application written to run on the IBM RT PC* on top of AIX*. AIX is the multitasking, multiuser operating system which runs on the RT PC. The RT has a RISC (reduced instruction set computer) 32-bit processor.

A diskette drive on the RT that is used by the PC AT Simulator in allocate mode is not available for use by any other PC AT Simulator session or any other AIX process while that Simulator session is active. The PC AT Simulator session must be cancelled for another process to access the diskette drive.

The data and commands that are output to the diskette ports are trapped and stored. On the first attempt of the Simulator to access the diskette drive, the Simulator diskette device driver is called to attach the diskette drive to the Simulator session. The attach will fail if the drive is being used by another AIX process or Simulator session. When the attach fails, the diskette registers are updated to indicate that the drive is busy. I/O to the diskette ports is performed when the attach is successful. When the I/O to the diskette indicates that the drive motor is to be turned off, the PC AT Simulator diskette drive device driver is called to detach from the diskette drive and allow other AIX processes or PAC AT Simulator sessions to access the diskette drive. * Trademark of IBM Corpora...