mirror of
https://github.com/bobbimanners/emailler.git
synced 2024-11-11 23:04:56 +00:00
96 lines
2.0 KiB
ArmAsm
96 lines
2.0 KiB
ArmAsm
|
|
.export print_a
|
|
.export print_cr
|
|
.export cls
|
|
.export beep
|
|
.export print_a_inverse
|
|
.import timer_read
|
|
.exportzp screen_current_row
|
|
.exportzp screen_current_col
|
|
|
|
screen_current_row=$d6
|
|
screen_current_col=$d3
|
|
|
|
;use VIC 20 Kernel ROM function to print a character to the screen
|
|
;inputs: A contains petscii value of character to print
|
|
;outputs: none
|
|
print_a = $ffd2
|
|
|
|
.bss
|
|
beep_timer: .res 1
|
|
|
|
.code
|
|
|
|
;use VIC 20 Kernel ROM function to move to a new line
|
|
;inputs: none
|
|
;outputs: none
|
|
print_cr:
|
|
lda #13
|
|
jmp print_a
|
|
|
|
;use VIC 20 Kernel ROM function to clear the screen
|
|
;inputs: none
|
|
;outputs: none
|
|
cls:
|
|
lda #147 ; 'CLR/HOME'
|
|
jmp print_a
|
|
|
|
;currently does nothing (should make a 'beep noise')
|
|
;inputs: none
|
|
;outputs: none
|
|
beep:
|
|
lda $900e
|
|
ora #15
|
|
sta $900e ;set volume
|
|
|
|
;turn on osc. 3
|
|
lda #$FF
|
|
sta $900c
|
|
|
|
; pause for qtr second
|
|
jsr timer_read
|
|
stx beep_timer
|
|
inc beep_timer
|
|
inc beep_timer
|
|
:
|
|
jsr timer_read
|
|
cpx beep_timer
|
|
bne :-
|
|
|
|
;turn off osc. 3
|
|
lda #$00
|
|
sta $900c
|
|
|
|
rts
|
|
|
|
|
|
;print a single char in inverse text:
|
|
print_a_inverse:
|
|
pha
|
|
lda #18 ;inverse mode on
|
|
jsr print_a
|
|
pla
|
|
jsr print_a
|
|
lda #146 ;inverse mode off
|
|
jmp print_a
|
|
|
|
|
|
|
|
; 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 --
|