uint16 x; // 6809 X index register
uint16 y; // 6809 Y index register
uint16 s; // 6809 System stack pointer
uint16 u; // 6809 User stack pointer
uint16 x; // 6809 X index register
uint16 y; // 6809 Y index register
uint16 s; // 6809 System stack pointer
uint16 u; // 6809 User stack pointer