Add support for non-standard kempston joy buttons
pacmancoder opened this issue · comments
In the original Kempston Joy only the lower 5 bits are used (Left, Right, Up, Down, Fire). However, there are still 3 bits left in the port value. These 3 bits should be handled and provided in the rustzx-core Kempston control interface as Ext1, Ext2, and Ext3 buttons to press