Stephen G Wozniak

US Patent:

42109590, Jul 1, 1980

Filed:

May 10, 1978

Appl. No.:

5/904420

Inventors:

Stephen G. Wozniak - San Jose CA

Assignee:

Apple Computer, Inc. - Cupertino CA

International Classification:

G06F 1308
G06F 306

US Classification:

364200

Abstract:

A controller for interfacing between a digital computer and a magnetic disc recorder, such as a "floppy" disc, or other recorder or memory is disclosed. The controller, which permits accessing of the disc with minimum control by the computer, is realized with relatively few components and is particularly suited for interfacing between a microcomputer and a "minifloppy". Track selection with a computed velocity profile is employed. Synchronization with a soft sectored disc is achieved without additional hardware.

US Patent:

41363590, Jan 23, 1979

Filed:

Apr 11, 1977

Appl. No.:

5/786197

Inventors:

Stephen G. Wozniak - Cupertino CA

Assignee:

Apple Computer, Inc. - Cupertino CA

International Classification:

H04N 944

US Classification:

358 17

Abstract:

A microcomputer including a video generator and timing means which provides color and high resolution graphics on a standard, raster scanned, cathode ray tube is disclosed. A horizontal synchronization counter is synchronized at an odd-submultiple of the color subcarrier reference frequency. A "delayed" count is employed in the horizontal synchronization counter to compensate for color subcarrier phase reversals between lines for the non-interlaced fields. This permits vertically aligned color graphics without substantially altering the standard horizontal synchronization frequency. Video color signals are generated directly from digital signals by employing a recirculating shift register.

US Patent:

42176042, Aug 12, 1980

Filed:

Sep 11, 1978

Appl. No.:

5/941032

Inventors:

Stephen G. Wozniak - San Jose CA

Assignee:

Apple Computer, Inc. - Cupertino CA

International Classification:

H04N 938

US Classification:

358 16

Abstract:

An apparatus for digitally controlling the display of color in a phase alternation line (PAL) video display is disclosed. Coded digital signals are shifted in a recirculating shift register. The direction of shifting in the register and the stage at which the signals in the register are sensed are changed as a function of odd/even display lines to compensate for PAL phase reversals.

US Patent:

42789729, Jul 14, 1981

Filed:

Jan 8, 1980

Appl. No.:

6/110409

Inventors:

Stephen G. Wozniak - Cupertino CA

Assignee:

Apple Computer, Inc. - Cupertino CA

International Classification:

G06F 314

US Classification:

340703

Abstract:

A microcomputer including a video generator and timing means which provides color and high resolution graphics on a standard, raster scanned, cathode ray tube is disclosed. A horizontal synchronization counter is synchronized at an odd-submultiple of the color subcarrier reference frequency. A "delayed" count is employed in the horizontal synchronization counter to compensate for color subcarrier phase reversals between lines. This permits vertically aligned color graphics without substantially altering the standard horizontal synchronization frequency. Video color signals are generated directly from digital signals by employing a recirculating shift register.