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turbo9_sys_io.asm
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turbo9_sys_io.asm
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; [TURBO9_HEADER_START]
; ////////////////////////////////////////////////////////////////////////////
; Turbo9 Microprocessor IP
; ////////////////////////////////////////////////////////////////////////////
; Website: www.turbo9.org
; Contact: team[at]turbo9[dot]org
; ////////////////////////////////////////////////////////////////////////////
; [TURBO9_LICENSE_START]
; BSD-1-Clause
;
; Copyright (c) 2020-2023
; Kevin Phillipson
; Michael Rywalt
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions are met:
;
; 1. Redistributions of source code must retain the above copyright notice,
; this list of conditions and the following disclaimer.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
; POSSIBILITY OF SUCH DAMAGE.
; [TURBO9_LICENSE_END]
; ////////////////////////////////////////////////////////////////////////////
; Engineer: Kevin Phillipson
; Description: Basic putchar and getchar system I/O using the bootloader SWI
; functions
;
; ////////////////////////////////////////////////////////////////////////////
; History:
; 07.14.2023 - Kevin Phillipson
; File header added
;
; ////////////////////////////////////////////////////////////////////////////
; [TURBO9_HEADER_END]
; ////////////////////////////////////////////////////////////////////////////
; System I/O Functions
; ////////////////////////////////////////////////////////////////////////////
putchar_a
pshs a,b
tfr a,b
lda #3
swi
puls a,b,pc
getchar_a
pshs x
lda #4
ldx #getchar_byte_buf
swi
lda >getchar_byte_buf
puls x,pc
getchar_byte_buf
fcb $00
terminate_prog
lda #0
swi
; ////////////////////////////////////////////////////////////////////////////