Procedures

This is an example of making a procedure call, using caller-save to preserve registers. The only register being preserved is the X index register.

Calling Procedure	Called Procedure
Push parameters on stack Push X index register with `pshx` `jsr procedure`
	Use `des` to reserve space on stack for local variables Use `tsx` to point X index register at base of new activation record (get work done) Use `ins` to get rid of locals `rts`
`pulx` to retrieve old X index register Use `ins` to remove parameters from stack

Access to parameters: calculate the offset from the x index register to the parameter, and use indexed addressing.