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  1. LAB1 START 1000
  2. LDX #0
  3. LDA #0
  4. LDT #0
  5. LDS #0
  6. OUTLOOP LDCH STR,X
  7.     STCH CHAR1
  8.     RMO X,T
  9.     LDX #1
  10. INERLOOP LDCH STR,X
  11.     COMP    CHAR1
  12.     JLT     SWAP
  13. J NOSWAP
  14. SWAP STCH CHAR2
  15. LDCH CHAR1
  16. STCH STR,X
  17. RMO X,S
  18. RMO X,A
  19. SUB #1
  20. RMO A,X
  21. LDCH CHAR2
  22. STCH STR,X
  23. LDA #1
  24. STA BOOLEAN
  25. RMO S,X
  26. NOSWAP TIX #4
  27. JLT INERLOOP
  28. LDX #0
  29. LDA #0
  30. COMP BOOLEAN
  31. JLT OUTLOOP
  32. LDX #0
  33. WHILE LDCH STR,X
  34. TIX #4
  35. JLT WHILE
  36. J ENP
  37. STR BYTE C’DCBA'
  38. CHAR1 RESB 1
  39. CHAR2 RESB 1
  40. BOOLEAN WORD 1
  41. ENP END LAB1
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