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123 lines
3.5 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/c64print.s</h1><h2 id="functions">functions</h2><table><tr><th>function</th><th>description</th></tr><tr><td id="beep">beep</td><td><pre>currently does nothing (should 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 C64 Kernel ROM function 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>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
</pre></td></tr><tr><td id="print_a_inverse">print_a_inverse</td><td><pre>print a single char in inverse text:
</pre></td></tr><tr><td id="print_cr">print_cr</td><td><pre>use C64 Kernel ROM function to move to a 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></td><td>$d3
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</td></tr><tr><td id="screen_current_row">screen_current_row</td><td></td><td>$d6
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</td></tr></table><h2>implementation</h2><pre id="code">
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.export print_a
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.export print_cr
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.export cls
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.export beep
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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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;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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print_a = $ffd2
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.bss
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beep_timer: .res 1
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.code
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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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print_cr:
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lda #13
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jmp print_a
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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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cls:
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lda #147 ; 'CLR/HOME'
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jmp print_a
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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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beep:
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lda #15
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sta $d418 ;set volume
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lda #0
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sta $d405
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lda #240
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sta $d406
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lda #8
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sta $d403
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;tone values for voice 1
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lda #48
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sta $d400
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lda #28
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sta $d401
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;enable tone register
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lda #65
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sta $d404
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; pause for qtr second
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lda $dd06 ;
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sta beep_timer
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inc beep_timer ;time counts backwards
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:
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lda $dd06 ;
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cmp beep_timer
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bne :-
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;disable tone register
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lda #65
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sta $d404
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lda #0
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sta $d418 ;set volume
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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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;-- LICENSE FOR c64print.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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