.define	.csb4
.sect .text
.sect .rom
.sect .data
.sect .bss
ECASE=20

.sect .text

.csb4:
		! case descriptor in a0
		! index in d0

	move.l	(a0)+, a1	! default jump address
	move.l	(a0)+, d1	! # entries
	beq	3f
	sub.l	#1, d1
1:
	cmp.l	(a0,d1.w*8), d0
	dbeq	d1, 1b
	bne	3f
	move.l	(4,a0,d1.w*8), a1 ! jump address
3:
	move.l	a1, d0
	beq	4f
	jmp	(a1)
4:
	move.l	#ECASE, -(sp)
	jmp	(.fatal)
.align 2