visrealm / vremu6522

6522 / 65C22 VIA emulation library

vrEmu6522

6522/65C22 emulator written in standard C99 with no external dependencies.

Initially created for my HBC-56 (6502 on a backplane) Emulator

Development status

Unlike my vrEmu6502 and vrEmuTms9918 libraries, this library is in the very early stages of development. So far, I am only implementing features of the 65C22 that I am actively using in my HBC-56 project.

Supported features

• Timer 1 (one-shot and free-running modes)
• Timer 2 (one-shot mode)

Unsupported features

• Everything else

Additional features will be added as required.

Building

vrEmu6522 uses the CMake build system

Checkout repository:

git clone https://github.com/visrealm/vrEmu6522.git
cd vrEmu6522

Setup build:

mkdir build
cd build
cmake ..

Build

cmake --build .

Windows: Optionally, open the generated solution file

Run tests

ctest

Windows: Optionally, build the ALL_TESTS project in the generated solution file

License

This code is licensed under the MIT license

vremu6522's Issues

IRQ not reset until tick called

IRQ is only reset after a tick call. We need to reset it immediately.