sic/xe object code

sic_hw2

Line    Loc                 Source statement    Object code
5       1000    ADDITION    START               1000
. I can't find RTL on textbook, is it STL?
10      1000    FIRST       STL     RETADR      172020
15      1003                BASE    ALPHA
20      1003                LDB     #ALPHA      690000
25      1006                LDS     #3          6D0000
30      1009                LDT     SIZE        77201A
35      100C                LDX     #0          050000
40      100F    ADDLP       LDA     ALPHA,X     03A012
45      1012                ADD     BETA,X      1BA015
50      1015                +STA    GAMMA,X     0F100000
55      1019                ADDR    S,X         9041
60      101B                COMPR   X,t         A015
65      101D                JLT     ADDLP       3B2FEF
70      1020                RSUB                4F0000
75      1023    RETADR      RESW    1
80      1026    SIZE        WORD    6144        001800
85      1029    ALPHA       RESW    2048
90      2829    BETA        RESW    2048
95      4029    GAMMA       RESW    2048
100     5829                END     FIRST