all repos — xyw @ 7080189bfbe1142ee142ec78c35df1b34184a68a

A minimal virtual machine and assembler for terminals.

examples/lib/lowcase.xyw

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; Convert a string to lowercase 
; a16 ->
.label lowcase
  ; store index
  POPxw
  .label lowcase.loop
    LDBxw $00 EQU lowcase.end JCNw
    ; check if an uppercase letter
    LDBxw $40 GTH
    LDBxw $5B LTH
    AND lowcase.change JCNw
    ; continue
    INCxw lowcase.loop JMPw
    .label lowcase.change
      ; convert to lowercase  
      LDBxw $20 ADD STBxw
      ; continue 
      INCxw lowcase.loop JMPw
    .label lowcase.end
      RTS