Machine Language: Strings and Structures – Butterfield, Jim

Compute!'s Gazette Disk Edition Issue No. 10, October 1994, p. 7

Butterfield illustrates a structure (similar to 'struct' in C) in machine lang ... s commented source code.

Machine Language: The MLM and Testing – Butterfield, Jim

Compute!'s Gazette Disk Edition Issue No. 11, November 1994, p. 8

Topics: working with a machine-language monitor, setting break points, and tes ... s. Includes source code.

Machine Langauge: Simple String Sort – Butterfield, Jim

Compute!'s Gazette Disk Edition Issue No. 12, December 1994, p. 7

A simple bubble sort of fixed-length strings in machine language. Source code ... 128 version is on disk.

Machine Language: Flags and Branches – Butterfield, Jim

Compute!'s Gazette Disk Edition Issue No. 13, January 1995, p. 10

The interaction of the 6502 processor flags with the branch instructions. Includes source code examples.

Machine Language: Lunar Landing – Butterfield, Jim

Compute!'s Gazette Disk Edition Issue No. 14, February 1995, p. 9

Calculations in machine language for a "Lunar Lander" game. Includes source code on disk.

PET in Transition – Butterfield, Jim

Compute! Issue 1, Volume 1, No. 1, September 1979, p. 68

Memory map for the PET ROM upgrade.

Un-Crashing on Upgrade ROM Computers – Butterfield, Jim

Compute! Issue 1, Volume 1, No. 1, September 1979, p. 89

Hardware methods to reset the PET when machine-language programs crash.

Book Review: 6502 Assembly Language Programming – Butterfield, Jim

Compute! Issue 2, Volume 2, No. 1, January 1980, p. 36

Review of 6502 Assembly Language Programming by Lance A. Leventhal (Osborne & Associates, 1979).

BASIC Memory Map (Page 0) – Butterfield, Jim

Compute! Issue 2, Volume 2, No. 1, January 1980, p. 41

Memory map comparing BASIC zero-page usage in the single-board KIM, AIM, and S ... le II (Applesoft BASIC).

A Few Entry Points: Original/Upgrade ROM – Butterfield, Jim

Compute! Issue 2, Volume 2, No. 1, January 1980, p. 93

Address cross-reference table comparing entry points for useful routines in bo ... M revisions for the PET.

Inside the 2040 Disk Drive – Butterfield, Jim

Compute! Issue 2, Volume 2, No. 1, January 1980, p. 94

A memory-dump program for looking at the ROMs inside the 2040 disk drive.

The New, Improved Bubble Sort – Butterfield, Jim

Compute! Issue 95, Volume 10, No. 4, April 1988, p. 84

If you dismissed the bubble sort as slow and old fashioned, you were right. But ... ed bubble sort in BASIC.