1. Perfect6502perfect6502, a MOS 6502 CPU emulator that performs a simulation of the original NMOS 6502 netlist
2. Msdos1A collection of disassembled and commented source of parts of MS-DOS 1.0
3. MsbasicMicrosoft BASIC for 6502 (Commodore, Apple, KIM-1, AIM-65, OSI, ...)
4. C64romCommodore 64 BASIC and KERNAL Source
5. Visualize 1541A tool that creates visualizations of the data layout on Commodore 1541 disk images
6. Hvdoshvdos, a simple DOS emulator based on the OS X Hypervisor.framework
7. C64refUltimate Commodore 64 Reference: ROM Disassembly, Memory Map, ...
8. Cbmbasiccbmbasic, a portable version of Commodore's version of Microsoft BASIC 6502 as found on the Commodore 64
9. GeosSource code of GEOS 2.0 for the Commodore 64 and 128
10. CbmsrcOriginal source code of various Commodore computers and peripherals.
11. mxassmxass, a cross assembler that targets Commodore 64-like platforms (6502/65816/Z80)
12. pucrunchpucrunch, an Optimizing Hybrid LZ77 RLE Data Compression Program for C64/C128/VIC-20/Plus4