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3e8704fe77
Chris made me aware that ASCII code 0 actually is a valid character (usually entered as Ctrl-Space or Ctrl-@) and that it is actually used (i.e. by EMACS). The Apple II allows to natively enter the ASCII code 0 via Ctrl-@. However so far get_key_if_available returned 0 in accumulator to signal that no key was pressed. In order to allow the Apple II get_key_if_available to return the ASCII code 0 in the accumulator I changed it to use the carry flag to signal that no key was pressed. Because get_key_if_available needs of course to behave the same on all targets I changed the other implementations to use the carry flag too. Unfortunately I don't know enough about input capabilities of the C64 to decide on how to best get Telnet65 to send ASCII code 0 there.
98 lines
2.6 KiB
ArmAsm
98 lines
2.6 KiB
ArmAsm
.include "atari.inc"
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.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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.export abort_key
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.exportzp abort_key_default = 0
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.exportzp abort_key_disable = 0
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.import ip65_process
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.data
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abort_key: .byte 0 ; ???
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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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bcc get_key
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rts
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; inputs: none
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; outputs: sec if key pressed, clear otherwise
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; A contains ASCII value of key just pressed
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get_key_if_available:
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lda CH ; GLOBAL VARIABLE FOR KEYBOARD
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cmp #255
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beq no_key
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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 ICBAL,x ; 1-byte low buffer address
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lda #>kname
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sta ICBAH,x ; 1-byte high buffer address
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lda #OPEN ; open
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sta ICCOM,x ; COMMAND CODE
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lda #OPNIN ; open for input (all devices)
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sta ICAX1,x ; 1-byte first auxiliary information
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jsr CIOV ; vector to CIO
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@read:
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lda #0
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sta ICBLL,x ; 1-byte low buffer length
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sta ICBLH,x ; 1-byte high buffer length
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lda #GETCHR ; get character(s)
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sta ICCOM,x ; COMMAND CODE
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jsr CIOV ; vector to CIO
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ldx #255
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stx CH ; GLOBAL VARIABLE FOR KEYBOARD
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sec
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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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bcc get_key_ip65
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rts
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;check whether the abort key is being pressed
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;inputs: none
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;outputs: sec if abort key pressed, clear otherwise
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check_for_abort_key:
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; TODO: implement actual check
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no_key:
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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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