MARKER    ADDRESS OPCODE           DECIMAL     HEX         ZX81 CHARS
======    ======= ======           =======     ===         ==========
          16514   defb 0           0           00          Space
          16515   defb 0           0           00          Space
          16516   defb 0           0           00          Space
          16517   defb 0           0           00          Space
          16518   defb 0           0           00          Space
          16519   ld hl,16514      33 130 64   21 82 40    5 GraphW RND
          16522   push hl          229         E5          FAST
          16523   ld (hl),0        54 0        36 00       Q Space
          16525   ld de,16515      17 131 64   11 83 40    ) Graph6 RND
          16528   ld bc,3          1 3 0       01 03 00    Graph1 Graph3 Space
          16531   ldir             237 176     ED B0       GOSUB InvK
          16533   pop hl           225         E1          LPRINT
          16534   push hl          229         E5          FAST
          16535   in a,(31)        219 31      DB 1F       <= 3
          16537   cp 255           254 255     FE FF       RETURN COPY
          16539   jr z,testright   40 8        28 08       C GraphA
          16541   ld b,4           6 4         06 04       GraphT Graph4
kemploop  16543   rrca             15          0F          ? (genuine question mark)
          16544   rl (hl)          203 22      CB 16       ACS -
          16546   inc hl           35          23          7
          16547   djnz kemploop    16 250      10 FA       ( IF
testright 16549   pop hl           225         E1          LPRINT
          16550   ld bc,57342      1 254 223   01 FE DF    Graph1 RETURN TO
          16553   in a,(c)         237 120     ED 78       GOSUB (unprintable)
          16555   bit 0,a          203 71      CB 47       ACS (unprintable)
          16557   jr nz,testleft   32 2        20 02       4 Graph2
          16559   set 0,(hl)       203 198     CB C6       ACS LEN
testleft  16661   inc hl           35          23          7
          16662   in a,(c)         237 120     ED 78       GOSUB (unprintable)
          16664   bit 2,a          203 87      CB 57       ACS (unprintable)
          16666   jr nz,testdown   32 2        20 02       4 Graph2
          16668   set 0,(hl)       203 198     CB C6       ACS LEN
testdown  16670   inc hl           35          23          7
          16671   ld b,254         6 254       06 FE       GraphT RETURN
          16673   in a,(c)         237 120     ED 78       GOSUB (unprintable)
          16675   bit 1,a          203 79      CB 4F       ACS (unprintable)
          16677   jr nz,testup     32 2        20 02       4 Graph2
          16679   set 0,(hl)       203 198     CB C6       ACS LEN
testup    16681   inc hl           35          23          7
          16682   ld b,251         6 251       06 FB       GraphT CLS
          16684   in a,(c)         237 120     ED 78       GOSUB (unprintable)
          16686   bit 0,a          203 71      CB 47       ACS (unprintable)
          16688   ret nz           192         C0          ""
          16689   set 0,(hl)       203 198     CB C6       ACS LEN
          16691   ret              201         C9          TAN
