Motorola Axiom CMD11E1 Guia do Utilizador descarregar pdf (Página 66)

66 CHAPTER 5. TABLES

fcc /Hit the reset button to quit/

fcb 10

fcc /=====================================/

fcb 10,10,10, 4

; setup the table of digits

digits fcc /0123456789/

ndigits equ 10

org $2100

ldx #preamble

jsr outstrg

mainloop

jsr rddigit

bra mainloop

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

; rddigit: Behaves like inchar, except ignores non-digits

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

rddigit jsr input *This does not wait for the user

tsta

beq rddigit *Looks like the user has not typed anything

;

; if we get here, the user typed something. Verify it first

;

ldx #digits

ldab #ndigits

jsr lookup

bcc rddigit *oops, not in the table. Go back for more

;

; if we get here, the input was ok

; echo it back as the user would like some feedback

;

jsr outa

rts

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Motorola Axiom CMD11E1 Guia do Utilizador Página 66