75 lines
2.0 KiB
ArmAsm
75 lines
2.0 KiB
ArmAsm
.export print_a
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.export print_a_inverse
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.export print_cr
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.export cls
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.export beep
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.exportzp screen_current_row
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.exportzp screen_current_col
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screen_current_col = $24 ; CH - Horizontal cursor-position (0-39)
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screen_current_row = $25 ; CV - Vertical cursor-position (0-23)
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.code
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; use Apple 2 monitor ROM function to display 1 char
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; inputs: A should be set to ASCII char to display
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; outputs: none
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print_a:
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ora #$80 ; turn ASCII into Apple 2 screen codes
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cmp #$e0 ; is it lower case?
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bcc @check_line_feed
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ldx $fbb3 ; check machine version
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cpx #$06 ; is it at least an //e?
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beq @check_line_feed
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and #$df ; convert to upper case
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@check_line_feed:
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cmp #$8a ; is it a line feed?
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bne @not_line_feed
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lda #$8d ; replace with a carriage return
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@not_line_feed:
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jmp $fded
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; use Apple 2 monitor ROM function to move to new line
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; inputs: none
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; outputs: none
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print_cr:
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jmp $fd8e
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; use Apple 2 monitor ROM function to clear the screen
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; inputs: none
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; outputs: none
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cls:
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jmp $fc58
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; use Apple 2 monitor ROM function to make a 'beep' noise
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; inputs: none
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; outputs: none
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beep:
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jmp $fbdd
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print_a_inverse:
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and #$7F ; turn off top bits
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jsr $fded
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; -- LICENSE FOR a2print.s --
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; The contents of this file are subject to the Mozilla Public License
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; Version 1.1 (the "License"); you may not use this file except in
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; compliance with the License. You may obtain a copy of the License at
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; http://www.mozilla.org/MPL/
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;
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; Software distributed under the License is distributed on an "AS IS"
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; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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; License for the specific language governing rights and limitations
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; under the License.
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;
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; The Original Code is ip65.
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;
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; The Initial Developer of the Original Code is Jonno Downes,
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; jonno@jamtronix.com.
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; Portions created by the Initial Developer are Copyright (C) 2009
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; Jonno Downes. All Rights Reserved.
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; -- LICENSE END --
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