Peripheral Vision: Keyboard Tipping – Butterfield, Jim

Commodore World Issue #18, December 1996, p. 42

An in-depth look at how the Commodore keyboard operates. A "listicle": 33 facts ... nterrupts, and cleaning.

Machine Language: Spring the Trap After the Quarry Runs – Butterfield, Jim

Compute!'s Gazette Special Section Volume 13, No. 4, April 1991, p. 20

The usual way to trap the interrupt is to divert the interrupt vector to a task ... e. Includes source code.

Machine Language: A Day at the Races – Butterfield, Jim

Compute!'s Gazette Special Section Volume 13, No. 5, May 1991, p. 18

A simple horse race simulation in machine language. Includes source code.

Machine Language: Putting It All Together – Butterfield, Jim

Compute!'s Gazette Special Section Volume 13, No. 6, June 1991, p. 21

Assembling the perfect assembler. Butterfield writes about the benefits of deve ... good symbolic assembler.

Machine Language: Calculating Hi-Res Screens: It All Adds Up – Butterfield, Jim

Compute!'s Gazette Special Section Volume 13, No. 7, July 1991, p. 20

Converting pixel coordinates to memory locations in machine language. Includes source code.

Machine Language: Back to Basics – Butterfield, Jim

Compute!'s Gazette Special Section Volume 13, No. 8, August 1991, p. 20

Walks through entering a simple program into a machine-language monitor. Includes source code.

Machine Language: Give It a Nudge with Binary Fractions – Butterfield, Jim

Compute!'s Gazette Special Section Volume 13, No. 9, September 1991, p. 20

Move sprites, draw lines, nudge integers, and do other clever things with the h ... y. Includes source code.

Some Routines from Microsoft BASIC – Butterfield, Jim

Compute II June/July 1980, p. 13

Memory maps of Microsoft BASIC for the KIM-1, SYM, AIM, and OSI versions.

Programming & Interfacing the 6502, with Experiments – Butterfield, Jim

Compute II June/July 1980, p. 21

Review of Programming & Interfacing the 6502, with Experiments (Howard W. Sams & Co., 1980).

BASIC Memory Map (Page 0) – Butterfield, Jim

Compute II June/July 1980, p. 33

Memory map comparing BASIC zero-page usage in the single-board KIM, AIM, SYM, and OSI computers.

Machine Language: Maxims for the Commodore 128 – Butterfield, Jim

The Transactor Volume 6, No. 5, March 1986, p. 26

Machine language tips from Jim Butterfield...the Commodore 128 doesn't call for ... or users new to the 128.

Commodore 128 Memory Maps: Important Locations – Butterfield, Jim

The Transactor Volume 6, No. 5, March 1986, p. 27

Important locations. (Abridged: August 15/85) A partial memory map of the 128.