SwitchCase:
DC.L foo,bar,baz,default ;case 0, case 1, case 2, case 3. (Case 0,1,2 are the "valid" cases.)
; D0 is the case selector variable (byte-sized)
doSwitchCase:       ;this is a subroutine that gets called elsewhere.
LEA SwitchCase,A0

;this is our bounds check
CMP.B #3,D0         ;is D0 > 3?
BLS InBounds        ;if not, keep going
MOVE.B #3,D0        ;if it is, set it to 3.


InBounds:
LSL.W #2,D0         ;multiply by 4 to index into a table of longs
MOVE.L (A0,D0),A0   ;deref the pointer and store the desired routine in A0
MOVE.L A0,-(SP)     ;push it onto the stack
RTS                 ;"return" to the selected routine. If it ends in an RTS,
                    ;  that RTS will return to just after "JSR doSwitchCase"


foo:
   ;your code for this case goes here.
   rts

bar:
   ;your code for this case goes here.
   rts

baz:
   ;your code for this case goes here.
   rts

default:
   rts