emailler/drivers/c64input.s

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.export get_key
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.export check_for_abort_key
.export get_key_if_available
.export get_key_ip65
.import ip65_process
.code
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; use C64 Kernel ROM function to read a key
; inputs: none
; outputs: A contains ASCII value of key just pressed
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get_key:
jsr get_key_if_available
beq get_key
rts
; use C64 Kernel ROM function to read a key
; inputs: none
; outputs: A contains ASCII value of key just pressed (0 if no key pressed)
get_key_if_available = $f142 ; not officially documented - where F13E (GETIN) falls through to if device # is 0 (KEYBD)
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; process inbound ip packets while waiting for a keypress
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get_key_ip65:
jsr ip65_process
jsr get_key_if_available
beq get_key_ip65
rts
; check whether the RUN/STOP key is being pressed
; inputs: none
; outputs: sec if RUN/STOP pressed, clear otherwise
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check_for_abort_key:
lda $cb ; current key pressed
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cmp #$3F
bne @not_abort
@flush_loop:
jsr get_key_if_available
bne @flush_loop
lda $cb ; current key pressed
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cmp #$3F
beq @flush_loop
sec
rts
@not_abort:
clc
rts
; -- LICENSE FOR c64input.s --
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; 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/
;
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; 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.
;
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; The Original Code is ip65.
;
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; 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.
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; -- LICENSE END --