emailler/docs/drivers_a2print_s.html

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