Implementing 16-bit unsigned AND operations in Commodore BASIC using two’s complement to work around the signed integer limitation.

Implementing 10PRINT on a KIM-1 clone (PAL-II) in both Microsoft BASIC and 6502 assembly, displaying the maze on the 7-segment LED display.

Exploring wAx, a native assembler for the VIC-20 that integrates with BASIC. Includes examples implementing 10PRINT and Fibonacci in assembly directly on the machine.

Optimizing a simple counting loop on the 6502, progressing from slow BASIC to increasingly faster assembly implementations. A practical guide to 6502 optimization.

Understanding two’s complement: how computers represent negative numbers, why it simplifies hardware design, and how to work with signed integers in assembly and high-level languages.