Commodore 128 Machine Language: Part 6 – Butterfield, Jim

Compute! Issue 80, Volume 9, No. 1, January 1987, p. 59

In this final series installment on Commodore 128 machine language programming, ... anked memory on the 128.

Machine Language: Six Commands are Keys to Input/Output – Butterfield, Jim

Compute!'s Gazette Special Section Volume 13, No. 10, October 1991, p. 19

Handle most of your input/output commands with just six easy Kernal calls. Manu ... e outputting to screen.

Machine Language: Fixed Point Numbers – Butterfield, Jim

Compute!'s Gazette Special Section Volume 13, No. 11, November 1991, p. 19

Working with fixed-point numbers is simple in machine language. All you need to ... -to-decimal conversions.

Machine Language: Programs, Constants, Variables – Butterfield, Jim

Compute!'s Gazette Special Section Volume 13, No. 12, December 1991, p. 19

Where to place program code, variables, and constants in your ML programs. Neat ... t. Includes source code.

Machine Language: Smooth Operators – Butterfield, Jim

Compute!'s Gazette Special Section Volume 14, No. 1, January 1992, p. 19

Logical operations AND, ORA, and EOR deal directly with the computer's fundamen ... e. Includes source code.

Machine Language: Bagels: A Machine Language Game – Butterfield, Jim

Compute!'s Gazette Special Section February/March 1992 – Volume 14, No. 2, p. 18

Play a mind-boggling guessing game, and learn how to program in machine languag ... e. Includes source code.

Machine Language: Putting a Hex on Your Output – Butterfield, Jim

Compute!'s Gazette Special Section Volume 14, No. 3, April 1992, p. 18

This program will read any file you name and print the first two bytes as a hex ... e. Includes source code.

Programmer's Tips: The IEEE-488 Bus – Butterfield, Jim

Commodore Interface May 1981, p. 20

Reprinted from The Transactor. Programming the IEEE-488 bus on the PET/CBM. Rep ... or, October 1979, p. 15.

Butterfield on Commodore: What Hardware Do I Have? What Software Do I Have? – Butterfield, Jim

Commodore Interface July 1981, p. 8

Jim Butterfield lends his expertise with some hints on identifying different ve ... and BASIC ROM revisions.

Machine Language: Rotating Buffers – Butterfield, Jim

Compute!'s Gazette Special Section Volume 14, No. 5, June 1992, p. 20

User a rotating buffer to determine a program's starting address and more. Here ... r. Includes source code.

Machine Language: Simple Stack Usage – Butterfield, Jim

Compute!'s Gazette Special Section Volume 14, No. 6, July 1992, p. 20

The stack works so well by itself that many programmers simply ignore it. The s ... P. Includes source code.

Machine Language: Screen Effects – Butterfield, Jim

Compute!'s Gazette Special Section Volume 14, No. 7, August 1992, p. 20

Create unusual screen effects. Modifying a thousand distinct character position ... e. Includes source code.