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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.
92 lines
2.5 KiB
ArmAsm
92 lines
2.5 KiB
ArmAsm
.export get_key
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.export check_for_abort_key
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.export get_key_if_available
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.export get_key_ip65
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.import ip65_process
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.data
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iocb: .byte 0
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kname: .byte "K:",155
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.code
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; inputs: none
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; outputs: A contains ASCII value of key just pressed
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get_key:
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jsr get_key_if_available
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beq get_key
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rts
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; inputs: none
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; outputs: A contains ASCII value of key just pressed (0 if no key pressed)
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get_key_if_available:
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lda $02fc ; GLOBAL VARIABLE FOR KEYBOARD
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cmp #255
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beq @nokey
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ldx iocb ; K: already open?
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bne @read
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ldx #$40 ; IOCB to use for keyboard input
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stx iocb ; mark K: as open
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lda #<kname
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sta $344,x ; 1-byte low buffer address
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lda #>kname
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sta $345,x ; 1-byte high buffer address
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lda #3 ; open
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sta $342,x ; COMMAND CODE
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lda #4 ; open for input (all devices)
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sta $34a,x ; 1-byte first auxiliary information
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jsr $e456 ; vector to CIO
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@read:
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lda #0
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sta $348,x ; 1-byte low buffer length
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sta $349,x ; 1-byte high buffer length
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lda #7 ; get character(s)
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sta $342,x ; COMMAND CODE
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jsr $e456 ; vector to CIO
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ldx #255
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stx $02fc ; GLOBAL VARIABLE FOR KEYBOARD
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rts
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@nokey:
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lda #0
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rts
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; process inbound ip packets while waiting for a keypress
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get_key_ip65:
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jsr ip65_process
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jsr get_key_if_available
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beq get_key_ip65
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rts
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;check whether the ??? key is being pressed
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;inputs: none
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;outputs: sec if ??? pressed, clear otherwise
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check_for_abort_key:
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; TODO: implement actual check
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clc
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rts
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;-- LICENSE FOR atrinputs.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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