Coding a new BASIC interpreter in 2025 to replace a slow one
18 hours ago
- #Intellivision
- #RetroComputing
- #BASIC
- The author developed an extended BASIC interpreter for the Intellivision II console's CP1610 processor, inspired by the slow performance of the original ECS BASIC.
- The interpreter features a custom 32-bit floating-point format optimized for the CP1610's 16-bit architecture, with routines for addition, subtraction, and multiplication.
- Key components include tokenization for speed, line editing capabilities, and execution flow control statements like GOTO, IF, and GOSUB/RETURN.
- The interpreter supports basic arithmetic operations, variable assignments, and loops (FOR/NEXT), significantly outperforming the original ECS BASIC in speed.
- Extended functionalities include graphics and sound commands (e.g., SPRITE, SOUND), and input handling for controllers and keyboard, demonstrated with a simple game, UFO Invasion.
- Future enhancements could include proper string support to broaden the interpreter's usability for text-processing programs and games.
- The project was completed in six days, showcasing the author's enjoyment and efficiency in programming. The source code is available on GitHub for public access.