2009-01-22 01:27:03 +00:00
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.export print_a
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.export print_cr
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2009-03-08 10:18:59 +00:00
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.export cls
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.export beep
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2009-07-31 14:50:02 +00:00
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.export print_a_inverse
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.exportzp screen_current_row
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.exportzp screen_current_col
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screen_current_row=$d6
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screen_current_col=$d3
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2009-01-22 01:27:03 +00:00
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.data
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2009-03-21 06:40:53 +00:00
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;use C64 Kernel ROM function to print a character to the screen
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;inputs: A contains petscii value of character to print
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;outputs: none
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2009-01-22 01:27:03 +00:00
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print_a = $ffd2
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.code
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2009-03-21 06:40:53 +00:00
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;use C64 Kernel ROM function to move to a new line
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;inputs: none
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;outputs: none
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2009-01-22 01:27:03 +00:00
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print_cr:
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lda #13
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2009-03-08 10:18:59 +00:00
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jmp print_a
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2009-01-22 01:27:03 +00:00
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2009-03-21 06:40:53 +00:00
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;use C64 Kernel ROM function to clear the screen
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;inputs: none
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;outputs: none
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2009-03-08 10:18:59 +00:00
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cls:
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lda #147 ; 'CLR/HOME'
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jmp print_a
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2009-03-21 06:40:53 +00:00
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;currently does nothing (should make a 'beep noise')
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;inputs: none
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;outputs: none
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2009-03-08 10:18:59 +00:00
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beep:
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2009-07-31 14:50:02 +00:00
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rts
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;print a single char in inverse text:
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print_a_inverse:
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pha
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lda #18 ;inverse mode on
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jsr print_a
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pla
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jsr print_a
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lda #146 ;inverse mode off
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jmp print_a
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