About Me
Hi! I’m Mark Long (mlong). With over 30 years of software development experience, I’ve done quite a bit of coding! This site highlights some of the work I’ve produced under my Lydian Scale Software marque.
Featured Projects
Microsoft TASC
The recovered source of the Applesoft compiler (1981)
Microsoft shipped TASC, its Applesoft BASIC compiler for the Apple II, only as compiled code, and its source code has long been presumed lost. That source has now been reconstructed, documented, and proven byte for byte with the original compiler and assembler. Also here: the manual, disk images, and AASCAD, a compiler and decompiler in one Python script. The GitHub project has the deeper dive into how it was done.
GitHub Repo
CiderPress II
Avalonia GUI Development (v 2.0 and beyond)
Andy McFadden’s famous utility for working with Apple II and vintage Mac disk images and file archives gets a GUI overhaul! I have adapted the original into a new cross-platform Avalonia-based GUI, enhancing it with new features, replacing the legacy WPF Windows-only application.
GitHub Repo
Pandowdy.CPU
A C# 6502 CPU emulator core supporting MOS 6502 (with and without illegal instructions), WDC 65C02, and Rockwell 65C02 variants
GitHub Repo