LOC  LABEL                    OC x ADDR   OBCODE
4000   SUM START 4000
4000 FIRST   LDX ZERO         04 0 5788   045788
4003         LDA ZERO         00 0 5788   005788
4006  LOOP   ADD TABLE,X      18 1 4015   18C015
4009         TIX COUNT        2C 0 5785   2C5785
400C         JLT LOOP         38 0 4006   384006
400F         STA TOTAL        0C 0 578B   0C578B
4012        RSUB              4C 0 0000   4C0000
4015 TABLE  RESW 2000
5785 COUNT  RESW 1
5788  ZERO  WORD 0                        000000
578B TOTAL  RESW 1
       END FIRST
	   
LOCCTR = 00578B + 000003 = 00578E
LENGTH = 00578E - 004000 = 00178E

obj code

HSUM   00400000178E
T0040001504578800578818C0152C57853840060C578B4C0000
T00578803000000
E004000