hello.z80

#include "ti83plus.inc"
; ^Includes a file. In this case the ti-83+ header file
#define    ProgStart    $9D95
; ^Replaces all ProgStarts in the code wirh $9D95
.org    ProgStart - 2
; ^Tells where in memory the program is
    .db    t2ByteTok, tAsmCmp
; ^Specifies some data
    b_call(_ClrLCDFull)
; ^Calls to a rom prgm in the calculator
; ^^ This one clears the screen
    ld    hl, 0
    ld    (PenCol), hl
    ld    hl, msg
    b_call(_PutS)            ; Display the text
    b_call(_NewLine)
    ret

msg:
    .db "Hello world!", 0
.end
.end