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86 lines
3.2 KiB
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><link rel="stylesheet" type="text/css" href="ca65-doc-style.css"/></head><body><a href="ref_index.html"><h1>ip65 technical reference</h1></a><h1>File : drivers/a2print.s</h1><h2 id="functions">functions</h2><table><tr><th>function</th><th>description</th></tr><tr><td id="beep">beep</td><td><pre>use Apple 2 monitor ROM function to move to make a 'beep' noise
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inputs: none
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outputs: none
</pre></td></tr><tr><td id="cls">cls</td><td><pre>use Apple 2 monitor ROM function to move to clear the screen
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inputs: none
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outputs: none
</pre></td></tr><tr><td id="print_a">print_a</td><td><pre>
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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
</pre></td></tr><tr><td id="print_a_inverse">print_a_inverse</td><td><pre/></td></tr><tr><td id="print_cr">print_cr</td><td><pre>use Apple 2 monitor ROM function to move to new line
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inputs: none
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outputs: none
</pre></td></tr></table><h2 id="constants">constants</h2><table><tr><th>constants</th><th>description</th><th>value</th></tr><tr><td id="screen_current_col">screen_current_col</td><td> CH - Horizontal cursor-position (0-39)
</td><td>$24 </td></tr><tr><td id="screen_current_row">screen_current_row</td><td> CV - Vertical cursor-position (0-23)
</td><td>$25 </td></tr></table><h2>implementation</h2><pre id="code">
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.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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.code
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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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;
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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 #$8A ;is it a line feed?
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bne @not_line_feed
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; jmp print_cr
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pha
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lda #$0
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sta screen_current_col
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pla
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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 move 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 move 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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</pre></body></html>
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