The lib65ce02 library aims to become a cycle exact emulation of the CSG 65CE02 cpu. It is written in c and available on GitHub. The application programming interface is inspired by Musashi Motorola 680x0 emulator by Karl Stenerud. Please realise that quite a few instructions needed guessing for their exact internal working since this cpu was never widely distributed and examined as for instance the MOS 6502.

Please have a look at the manual (= a work in progress!) for the inner working of the cpu and its instructions.

Many emulation libraries for older cpu's already exist. This project serves my own learning experience and forms a crucial component of the E64 virtual computer system.

Typically, this library will not take control of the main thread, instead it will run a designated amount of cycles using the int csg65ce02_run(csg65ce02 *thisCPU, unsigned int no_cycles); function that returns the number of processed cycles. Variable exit_code_run_function inside the csg65ce02 structure stores 0 on normal execution and 1 on a breakpoint encounter. It is possible to run only one cpu instruction by calling this function with 0 cycles as an argument.

Beside the emulation core, the library also contains a disassembler. The function uint8_t csg65ce02_dasm(uint16_t address, char *buffer, int length) uses the memory read function from the emulation core. That way, the disassembler reads memory the same way as the cpu.

It doesn't compile into a shared library or something similar. If you want the cpu emulation core in your own project, just copy and add all csg65ce02*.* files into your source tree. To compile the supplied emulate_65ce02 application: make a build folder in the lib65ce02 project tree, enter it and run the following commands from the shell:

cmake ..
make
./emulate_65ce02

The source code in main.c is quite self-explanatory.

Copyright (c) 2018 elmerucr

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