.sect .text; .sect .rom; .sect .data; .sect .bss
.sect .text
.define .sbi

	! #bytes in cx , top of stack in ax
.sbi:
	pop     bx              ! return subress
	cmp     cx,2
	jne     1f
	pop     cx
	sub     ax,cx
	neg     ax
	jmp     bx
1:
	cmp     cx,4
	jne     9f
	pop     dx
	pop     cx
	sub     cx,ax
	mov     ax,cx
	pop     cx
	sbb     cx,dx
	push    cx
	jmp     bx
9:
.extern EODDZ
.extern .trp
	mov     ax,EODDZ
	push    ax
	jmp     .trp