quartz/content/notes/6809.md

title	aliases	tags
6809		cosc204

Routines

All variables are global so there is no params or local vars.

There are three way to "Branch" to a subroutine.

• lbsr
• bsr
• jsr

There are subtle differences but we will use bsr mostly

bsr myroutine:

myroutine:
	rts

Iteration

Done using GOTOs

	clra           //A = 0
more:
	cmpa #$06      //compare A to $06 (sets the equal flag in CC if true)
	beq done       //if the equal flag is set, branch to done
	inca           //increment a
	bra more       //branch to more
done:

other instructions set flags too

Input/Output

Hello World

Assembler