This is a temporary hack until a real speed switch is available.

By computing only the color associated with the byte in question.
This avoid computation that was not required.

The double speed mode is still not available.

Allows usage of tiles from multiple VRAM banks.

Created more panic conditions for the KEY0 and KEY1.

This dependency was creating issues with clap>=4.

The background attributes seem to be failing.

The code is still pending extensive test and some errors may exist.

This changes the way the device is called.

Will allow much better debug.