Supermon 1.0 – Butterfield, Jim
The Transactor Volume 2, No. 8, January 1980, p. 15
Machine-language monitor for the PET. Includes extensive documentation. Correc ... r, Vol. 2, No. 9, p. 47.
Input and Output from PET Machine Language – Butterfield, Jim
The Transactor Volume 2, No. 9, 1980, p. 10
Calling INPUT and GET Kernal routines in machine language.
PET as an IEEE-4888 Logic Analyzer – Butterfield, Jim
The Transactor Volume 2, No. 9, 1980, p. 12
Tool for monitoring the status of four of the GPIB control lines: NRFD, NDAC, ... I. Includes source code.
Cross-Reference – Butterfield, Jim
The Transactor Volume 2, No. 9, 1980, p. 18
Program reads a BASIC listing from disk and compiles lists of variable and lin ... mpute!, May 1980, p. 63.
BASIC 4.0 Memory Map – Butterfield, Jim
The Transactor Volume 2, No. 10, 1980, p. 34
BASIC 4.0 Memory Map, with a description of all zero page addresses.
PET 4.0 ROM Routines – Butterfield, Jim
The Transactor Volume 2, No. 10, 1980, p. 37
Detailed memory map of the BASIC 4.0 and Kernal ROMs
Text Editor – Butterfield, Jim
The Transactor Volume 2, No. 11, 1980, p. 8
A simple text editor for the PET written in BASIC.
Simple 8010 Modem Programs – Butterfield, Jim
The Transactor Volume 2, No. 11, 1980, p. 28
Simple BASIC programs for communicating to another computer over the 8010 mode ... either ASCII or PETSCII.
A Few Entry Points, 1.0 / 2.0 / 4.0 ROM – Butterfield, Jim
The Transactor Volume 2, No. 12, 1981, p. 34
Cross-reference memory map for the BASIC and Kernal ROM revisions on the PET/CBM.
Tax Ontario 1980 – Butterfield, Jim
The Transactor Volume 3, No. 1, 1981, p. 25
Ontario tax preparation assistant program written in BASIC.
Machine Language Programming: Simple Counting Loops – Butterfield, Jim
Compute!'s Gazette Issue 61, Volume 6, No. 7, July 1988, p. 44
Approaches to writing counters in machine language. Includes source code.
Machine Language Programming: Pointer Loops – Butterfield, Jim
Compute!'s Gazette Issue 62, Volume 6, No. 8, August 1988, p. 42
Indirect addressing and pointers in 6502 machine language. Includes source code examples.