C Development

C Compilers

CC65

Dedicated cc65 wiki page.

Calypsi

Dedicated llvm-mos wiki page.

Website with all the info: Calypsi

LLVM-MOS

Dedicated llvm-mos wiki page.

This fork of llvm-mos was adapted for F256/Wildbits usage by user sduensing from Kangaroo Punch Studios and can be found here. The installation instructions are simple and work for both Windows and Linux. It mostly uses a one-stop-shop f256lib.h file containing macros and functions leveraging some devices (not all yet) and the MicroKernel.

The default linking configuration will have your code start at 0x300, a 8 kb stack/trampoline from 0xA000 to 0xBFFF that is used to bring in higher memory content visible into that slice of the first 64k of the CPU. The slice 0xC000 to 0xDFFF is used by IO as usual and 0xE000 to 0xFFFF is used by the MicroKernel as usual. To change any of this, you can bring a modified copy of link.ld into your /projectfolder/ and it will supersede this default mapping.

Oscar64

Dedicated oscar64 wiki page.

Oscar64 is a C/C++ cross compiler running on a modern system (such as a Windows PC, Mac or Linux machine) and targets the classic 6502 family of processors. It is mainly focused on Commodore systems such as the C64, PET or VIC20. The compiler supports C99 and many C++ features up to variadic templates and lambda functions.

The purpose of this compiler is to eliminate the need to write 6502 assembler code to achieve high code density and fast execution speed. It continues to improve with all the games, demos and tools written by it. It supports disk overlays and banked cartridges for larger projects.

Oscar64 was adapted for the F256/WildBits by swdfrost and here is a link its github page. You will also need the adaptation of the f256lib (ported over from llvm-mos) from this github page as well, which also includes many projects examples as well.