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cd0506d862
The actual ATARI-specific code is "inspired" by the IP65 variant published in http://atariage.com/forums/topic/211161-dragoncart-software/?p=2734494. The timer routines are modeled after the ones for the VIC20.
98 lines
2.2 KiB
ArmAsm
98 lines
2.2 KiB
ArmAsm
.include "../inc/common.i"
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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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screen_current_col = $55 ; 2-byte cursor column
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screen_current_row = $54 ; 1-byte cursor row
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.bss
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char: .res 1
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.code
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; use ATARI CIOV 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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cmp #10 ; is it a CR?
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bne @not_lf
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lda #155 ; CR/LF char
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@not_lf:
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cmp #13 ; is it a LF?
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bne @not_cr
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lda #155 ; CR/LF char
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@not_cr:
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sta char
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txa
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pha
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tya
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pha
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ldax #1
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stax $0348 ; 2-byte buffer length
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ldax #char
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stax $0344 ; 2-byte buffer address
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ldx #11 ; put character(s)
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stx $0342 ; COMMAND CODE
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ldx #0
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jsr $e456 ; vector to CIO
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pla
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tay
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pla
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tax
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rts
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; use ATARI CIOV 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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lda #155 ; CR/LF char
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jmp print_a
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; use ATARI CIOV 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 #125 ; clear screen
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jmp print_a
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; use ATARI CIOV 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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lda #253 ; beep char
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jmp print_a
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print_a_inverse:
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ora #$80 ; turn on top bit
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jmp print_a
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;-- LICENSE FOR atrprint.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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