Kurt A Johnson

US Patent:

6766520, Jul 20, 2004

Filed:

Jun 8, 2000

Appl. No.:

09/590712

Inventors:

Michael J. Rieschl - St. Paul MN
Kurt N. Johnson - Edina MN
Dave Q. Anderson - Coon Rapids MN

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

G06F 1310

US Classification:

719321, 703 24

Abstract:

Emulation of a hardware peripheral is accomplished through use of object oriented software and runs in an object oriented environment. Particular adaptation of an emulation to enable specific data storage magnetic tape drive peripheral is described. Use of emulators in general enables continued reliance on legacy hardware and software without maintaining an entire suite of legacy hardware. Simplified emulation structure enabled by object oriented programming described herein makes migration from legacy systems feasible in stages at relatively low cost. In set-up and in use, users can have control over instances of emulator objects, including association with data files that operate as virtual storage media whether initially associated with the emulator or not, using a simple window-based interface for choosing particular data files, opening them, opening new instances of emulator objects and so forth. Variations are also described. Legacy programming is handled by use of legacy instructions communicated to the emulated object instances, which the object instances respond to appropriately.

US Patent:

7184944, Feb 27, 2007

Filed:

Feb 20, 2004

Appl. No.:

10/783817

Inventors:

Michael J. Rieschl - Cottage Grove MN, US
Qingyan Chen - Vadnais Heights MN, US
Kurt N. Johnson - Edina MN, US
Dave Q. Anderson - Coon Rapids MN, US

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

G06F 9/455
G06F 12/08

US Classification:

703 21, 711113, 711118, 711209

Abstract:

A main memory simulation system includes storage files, a cache buffer, and an interface. The storage files includes both a fast look-up table and a slow look-up table. The fast look-up table is operable to directly obtain a page address that has been allocated to a main memory address while the slow look-up table is operable to first determine if a page address has been allocated to a main memory address and then to obtain the allocated page address. The interface operates to receive a request for transfer of main memory, in the form of a main memory address, from a storage file to the buffer of the cache. The interface responds by performing a page transfer between the storage file and buffer according to the page address that has been allocated to the requested main memory address, as found in the fast or slow look-up table.

US Patent:

20190038954, Feb 7, 2019

Filed:

Aug 2, 2018

Appl. No.:

16/053462

Inventors:

Kurt Johnson - Chaska MN, US

International Classification:

A63B 71/06
A63B 69/00

Abstract:

A simulator system includes a projector, a target assembly and a data processing system. The target assembly includes a projection surface and a sensor array defines a sensing plane configured to sense a position of a projectile in the sensing plane relative to the projection surface.

Address:

21020 Kenyon St NE, Cedar, MN 55011

VIN:

1FMEU51877UA18277

Make:

FORD

Model:

EXPLORER SPORT TRAC

Year:

2007