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Add C support for Atari 2600 (VCS)
This commit is contained in:
Florent Flament
parent
1fc2dfb64f
commit
c1aac0de0e
22
cfg/atari2600.cfg
Normal file
22
cfg/atari2600.cfg
Normal file
@ -0,0 +1,22 @@
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# Atari VCS 2600 linker configuration file for cc65
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#
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# Florent Flament (contact@florentflament.com), 2017
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SYMBOLS {
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__STACKSIZE__: type = weak, value = $0010; # 16 Bytes system stack
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}
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MEMORY {
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RAM: file = "", start = $0080, size = $0080 - __STACKSIZE__, define = yes;
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ROM: file = %O, start = $F000, size = $1000, fill = yes, fillval = $FF;
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}
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SEGMENTS {
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ZEROPAGE: load = RAM, type = zp;
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STARTUP: load = ROM, type = ro;
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CODE: load = ROM, type = ro;
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RODATA: load = ROM, type = ro, optional = yes;
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DATA: load = ROM, run = RAM, type = rw, optional = yes, define = yes;
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BSS: load = RAM, type = bss, optional = yes;
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VECTORS: load = ROM, type = ro, start = $FFFA;
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}
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26
include/_riot.h
Normal file
26
include/_riot.h
Normal file
@ -0,0 +1,26 @@
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/*****************************************************************************/
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/* */
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/* Atari VCS 2600 RIOT registers addresses */
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/* */
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/* Source: DASM - vcs.h */
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/* */
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/* Florent Flament (contact@florentflament.com), 2017 */
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/* */
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/*****************************************************************************/
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/* RIOT registers */
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struct __riot {
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unsigned char swcha;
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unsigned char swacnt;
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unsigned char swchb;
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unsigned char swbcnt;
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unsigned char intim;
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unsigned char timint;
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unsigned char unused[14];
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unsigned char tim1t;
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unsigned char tim8t;
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unsigned char tim64t;
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unsigned char t1024t;
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};
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100
include/_tia.h
Normal file
100
include/_tia.h
Normal file
@ -0,0 +1,100 @@
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/*****************************************************************************/
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/* */
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/* Atari VCS 2600 TIA registers addresses */
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/* */
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/* Source: DASM - vcs.h */
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/* */
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/* Florent Flament (contact@florentflament.com), 2017 */
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/* */
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/*****************************************************************************/
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/* TIA write / read registers */
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struct __tia {
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union {
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unsigned char vsync;
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unsigned char cxm0p;
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};
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union {
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unsigned char vblank;
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unsigned char cxm1p;
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};
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union {
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unsigned char wsync;
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unsigned char cxp0fb;
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};
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union {
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unsigned char rsync;
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unsigned char cxp1fb;
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};
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union {
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unsigned char nusiz0;
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unsigned char cxm0fb;
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};
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union {
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unsigned char nusiz1;
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unsigned char cxm1fb;
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};
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union {
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unsigned char colup0;
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unsigned char cxblpf;
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};
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union {
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unsigned char colup1;
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unsigned char cxppmm;
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};
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union {
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unsigned char colupf;
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unsigned char inpt0;
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};
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union {
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unsigned char colubk;
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unsigned char inpt1;
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};
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union {
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unsigned char ctrlpf;
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unsigned char inpt2;
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};
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union {
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unsigned char refp0;
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unsigned char inpt3;
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};
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union {
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unsigned char refp1;
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unsigned char inpt4;
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};
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union {
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unsigned char pf0;
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unsigned char inpt5;
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};
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unsigned char pf1;
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unsigned char pf2;
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unsigned char resp0;
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unsigned char resp1;
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unsigned char resm0;
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unsigned char resm1;
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unsigned char resbl;
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unsigned char audc0;
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unsigned char audc1;
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unsigned char audf0;
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unsigned char audf1;
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unsigned char audv0;
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unsigned char audv1;
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unsigned char grp0;
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unsigned char grp1;
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unsigned char enam0;
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unsigned char enam1;
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unsigned char enabl;
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unsigned char hmp0;
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unsigned char hmp1;
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unsigned char hmm0;
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unsigned char hmm1;
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unsigned char hmbl;
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unsigned char vdelp0;
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unsigned char vdelp1;
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unsigned char vdelbl;
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unsigned char resmp0;
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unsigned char resmp1;
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unsigned char hmove;
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unsigned char hmclr;
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unsigned char cxclr;
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};
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26
include/atari2600.h
Normal file
26
include/atari2600.h
Normal file
@ -0,0 +1,26 @@
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/*****************************************************************************/
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/* */
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/* Atari VCS 2600 TIA & RIOT registers addresses */
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/* */
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/* Source: DASM Version 1.05 - vcs.h */
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/* */
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/* Florent Flament (contact@florentflament.com), 2017 */
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/* */
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/*****************************************************************************/
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#ifndef _ATARI2600_H
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#define _ATARI2600_H
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/* Check for errors */
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#if !defined(__ATARI2600__)
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# error This module may only be used when compiling for the Atari 2600!
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#endif
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#include <_tia.h>
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#define TIA (*(struct __tia*)0x0000)
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#include <_riot.h>
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#define RIOT (*(struct __riot*)0x0280)
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/* End of atari2600.h */
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#endif /* #ifndef _ATARI2600_H */
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@ -19,6 +19,7 @@ TARGETS = apple2 \
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apple2enh \
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atari \
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atarixl \
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atari2600 \
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atari5200 \
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atmos \
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$(CBMS) \
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49
libsrc/atari2600/crt0.s
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49
libsrc/atari2600/crt0.s
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; Atari VCS 2600 startup code for cc65
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;
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; Florent Flament (contact@florentflament.com), 2017
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.export _exit
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.export __STARTUP__ : absolute = 1
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.import __RAM_START__, __RAM_SIZE__
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.import copydata
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.import _main
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.include "zeropage.inc"
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.segment "STARTUP"
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start:
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; Clear decimal mode
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cld
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; Initialization Loop:
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; * Clears Atari 2600 whole memory (128 bytes) including BSS segment
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; * Clears TIA registers
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; * Sets system stack pointer to $ff (i.e top of zero-page)
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ldx #0
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txa
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clearLoop:
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dex
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txs
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pha
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bne clearLoop
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; Initialize data
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jsr copydata
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; Initialize C stack pointer
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lda #<(__RAM_START__ + __RAM_SIZE__)
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ldx #>(__RAM_START__ + __RAM_SIZE__)
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sta sp
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stx sp+1
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; Call main
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jsr _main
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_exit: jmp _exit
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.segment "VECTORS"
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.word start ; NMI
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.word start ; Reset
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.word start ; IRQ
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162
libsrc/atari2600/ctype.s
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162
libsrc/atari2600/ctype.s
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;
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; Ullrich von Bassewitz, 2003-10-10
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;
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; Character specification table.
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;
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.include "ctype.inc"
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; The tables are readonly, put them into the rodata segment
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.rodata
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; The following 256 byte wide table specifies attributes for the isxxx type
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; of functions. Doing it by a table means some overhead in space, but it
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; has major advantages:
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;
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; * It is fast. If it weren't for the slow parameter passing of cc65, one
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; could even define macros for the isxxx functions (this is usually
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; done on other platforms).
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;
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; * It is highly portable. The only unportable part is the table itself,
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; all real code goes into the common library.
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;
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; * We save some code in the isxxx functions.
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__ctype:
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.byte CT_CTRL ; 0/00 ___ctrl_@___
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.byte CT_CTRL ; 1/01 ___ctrl_A___
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.byte CT_CTRL ; 2/02 ___ctrl_B___
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.byte CT_CTRL ; 3/03 ___ctrl_C___
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.byte CT_CTRL ; 4/04 ___ctrl_D___
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.byte CT_CTRL ; 5/05 ___ctrl_E___
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.byte CT_CTRL ; 6/06 ___ctrl_F___
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.byte CT_CTRL ; 7/07 ___ctrl_G___
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.byte CT_CTRL ; 8/08 ___ctrl_H___
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.byte CT_CTRL | CT_OTHER_WS | CT_SPACE_TAB
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; 9/09 ___ctrl_I___
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.byte CT_CTRL | CT_OTHER_WS ; 10/0a ___ctrl_J___
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.byte CT_CTRL | CT_OTHER_WS ; 11/0b ___ctrl_K___
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.byte CT_CTRL | CT_OTHER_WS ; 12/0c ___ctrl_L___
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.byte CT_CTRL | CT_OTHER_WS ; 13/0d ___ctrl_M___
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.byte CT_CTRL ; 14/0e ___ctrl_N___
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.byte CT_CTRL ; 15/0f ___ctrl_O___
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.byte CT_CTRL ; 16/10 ___ctrl_P___
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.byte CT_CTRL ; 17/11 ___ctrl_Q___
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.byte CT_CTRL ; 18/12 ___ctrl_R___
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.byte CT_CTRL ; 19/13 ___ctrl_S___
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.byte CT_CTRL ; 20/14 ___ctrl_T___
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.byte CT_CTRL ; 21/15 ___ctrl_U___
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.byte CT_CTRL ; 22/16 ___ctrl_V___
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.byte CT_CTRL ; 23/17 ___ctrl_W___
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.byte CT_CTRL ; 24/18 ___ctrl_X___
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.byte CT_CTRL ; 25/19 ___ctrl_Y___
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.byte CT_CTRL ; 26/1a ___ctrl_Z___
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.byte CT_CTRL ; 27/1b ___ctrl_[___
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.byte CT_CTRL ; 28/1c ___ctrl_\___
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.byte CT_CTRL ; 29/1d ___ctrl_]___
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.byte CT_CTRL ; 30/1e ___ctrl_^___
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.byte CT_CTRL ; 31/1f ___ctrl_____
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.byte CT_SPACE | CT_SPACE_TAB ; 32/20 ___SPACE___
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.byte CT_NONE ; 33/21 _____!_____
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.byte CT_NONE ; 34/22 _____"_____
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.byte CT_NONE ; 35/23 _____#_____
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.byte CT_NONE ; 36/24 _____$_____
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.byte CT_NONE ; 37/25 _____%_____
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.byte CT_NONE ; 38/26 _____&_____
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.byte CT_NONE ; 39/27 _____'_____
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.byte CT_NONE ; 40/28 _____(_____
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.byte CT_NONE ; 41/29 _____)_____
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.byte CT_NONE ; 42/2a _____*_____
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.byte CT_NONE ; 43/2b _____+_____
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.byte CT_NONE ; 44/2c _____,_____
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.byte CT_NONE ; 45/2d _____-_____
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.byte CT_NONE ; 46/2e _____._____
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.byte CT_NONE ; 47/2f _____/_____
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.byte CT_DIGIT | CT_XDIGIT ; 48/30 _____0_____
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.byte CT_DIGIT | CT_XDIGIT ; 49/31 _____1_____
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.byte CT_DIGIT | CT_XDIGIT ; 50/32 _____2_____
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.byte CT_DIGIT | CT_XDIGIT ; 51/33 _____3_____
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.byte CT_DIGIT | CT_XDIGIT ; 52/34 _____4_____
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.byte CT_DIGIT | CT_XDIGIT ; 53/35 _____5_____
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.byte CT_DIGIT | CT_XDIGIT ; 54/36 _____6_____
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.byte CT_DIGIT | CT_XDIGIT ; 55/37 _____7_____
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.byte CT_DIGIT | CT_XDIGIT ; 56/38 _____8_____
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.byte CT_DIGIT | CT_XDIGIT ; 57/39 _____9_____
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.byte CT_NONE ; 58/3a _____:_____
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.byte CT_NONE ; 59/3b _____;_____
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.byte CT_NONE ; 60/3c _____<_____
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.byte CT_NONE ; 61/3d _____=_____
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.byte CT_NONE ; 62/3e _____>_____
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.byte CT_NONE ; 63/3f _____?_____
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.byte CT_NONE ; 64/40 _____@_____
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.byte CT_UPPER | CT_XDIGIT ; 65/41 _____A_____
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.byte CT_UPPER | CT_XDIGIT ; 66/42 _____B_____
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.byte CT_UPPER | CT_XDIGIT ; 67/43 _____C_____
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.byte CT_UPPER | CT_XDIGIT ; 68/44 _____D_____
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.byte CT_UPPER | CT_XDIGIT ; 69/45 _____E_____
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.byte CT_UPPER | CT_XDIGIT ; 70/46 _____F_____
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.byte CT_UPPER ; 71/47 _____G_____
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.byte CT_UPPER ; 72/48 _____H_____
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.byte CT_UPPER ; 73/49 _____I_____
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.byte CT_UPPER ; 74/4a _____J_____
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.byte CT_UPPER ; 75/4b _____K_____
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.byte CT_UPPER ; 76/4c _____L_____
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.byte CT_UPPER ; 77/4d _____M_____
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.byte CT_UPPER ; 78/4e _____N_____
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.byte CT_UPPER ; 79/4f _____O_____
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.byte CT_UPPER ; 80/50 _____P_____
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.byte CT_UPPER ; 81/51 _____Q_____
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.byte CT_UPPER ; 82/52 _____R_____
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.byte CT_UPPER ; 83/53 _____S_____
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.byte CT_UPPER ; 84/54 _____T_____
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.byte CT_UPPER ; 85/55 _____U_____
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.byte CT_UPPER ; 86/56 _____V_____
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.byte CT_UPPER ; 87/57 _____W_____
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.byte CT_UPPER ; 88/58 _____X_____
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.byte CT_UPPER ; 89/59 _____Y_____
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.byte CT_UPPER ; 90/5a _____Z_____
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.byte CT_NONE ; 91/5b _____[_____
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.byte CT_NONE ; 92/5c _____\_____
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.byte CT_NONE ; 93/5d _____]_____
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.byte CT_NONE ; 94/5e _____^_____
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.byte CT_NONE ; 95/5f _UNDERLINE_
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.byte CT_NONE ; 96/60 ___grave___
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.byte CT_LOWER | CT_XDIGIT ; 97/61 _____a_____
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.byte CT_LOWER | CT_XDIGIT ; 98/62 _____b_____
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.byte CT_LOWER | CT_XDIGIT ; 99/63 _____c_____
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.byte CT_LOWER | CT_XDIGIT ; 100/64 _____d_____
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.byte CT_LOWER | CT_XDIGIT ; 101/65 _____e_____
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.byte CT_LOWER | CT_XDIGIT ; 102/66 _____f_____
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.byte CT_LOWER ; 103/67 _____g_____
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.byte CT_LOWER ; 104/68 _____h_____
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.byte CT_LOWER ; 105/69 _____i_____
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.byte CT_LOWER ; 106/6a _____j_____
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.byte CT_LOWER ; 107/6b _____k_____
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.byte CT_LOWER ; 108/6c _____l_____
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.byte CT_LOWER ; 109/6d _____m_____
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.byte CT_LOWER ; 110/6e _____n_____
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.byte CT_LOWER ; 111/6f _____o_____
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.byte CT_LOWER ; 112/70 _____p_____
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.byte CT_LOWER ; 113/71 _____q_____
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.byte CT_LOWER ; 114/72 _____r_____
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.byte CT_LOWER ; 115/73 _____s_____
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.byte CT_LOWER ; 116/74 _____t_____
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.byte CT_LOWER ; 117/75 _____u_____
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.byte CT_LOWER ; 118/76 _____v_____
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.byte CT_LOWER ; 119/77 _____w_____
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.byte CT_LOWER ; 120/78 _____x_____
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.byte CT_LOWER ; 121/79 _____y_____
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.byte CT_LOWER ; 122/7a _____z_____
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.byte CT_NONE ; 123/7b _____{_____
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.byte CT_NONE ; 124/7c _____|_____
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.byte CT_NONE ; 125/7d _____}_____
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.byte CT_NONE ; 126/7e _____~_____
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.byte CT_OTHER_WS ; 127/7f ____DEL____
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.res 128, CT_NONE ; 128-255
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@ -147,6 +147,9 @@ EXELIST_atari = \
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EXELIST_atarixl = $(EXELIST_atari)
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EXELIST_atari2600 = \
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atari2600hello
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# --------------------------------------------------------------------------
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# Rules to make the binaries and the disk
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56
samples/atari2600hello.c
Normal file
56
samples/atari2600hello.c
Normal file
@ -0,0 +1,56 @@
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/*****************************************************************************/
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/* */
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/* Atari VCS 2600 sample C program */
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/* */
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/* Florent Flament (contact@florentflament.com), 2017 */
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/* */
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/*****************************************************************************/
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#include <atari2600.h>
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// PAL Timings
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// Roughly computed based on Stella Programmer's guide (Steve Wright)
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// scanlines count per section.
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#define VBLANK_TIM64 51 // 45 lines * 76 cycles/line / 64 cycles/tick
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#define KERNAL_T1024 17 // 228 lines * 76 cycles/line / 1024 cycles/tick
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#define OVERSCAN_TIM64 42 // 36 lines * 76 cycles/line / 64 cycles/tick
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// Testing memory zones
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const unsigned char rodata_v[] = "Hello!";
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unsigned char data_v = 0x77;
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unsigned char bss_v;
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void main(void) {
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unsigned char color = 0x79; // Stack variable
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bss_v = 0x88; // Testing BSS variable
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for/*ever*/(;;) {
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// Vertical Sync signal
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TIA.vsync = 0x02;
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TIA.wsync = 0x00;
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TIA.wsync = 0x00;
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TIA.wsync = 0x00;
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TIA.vsync = 0x00;
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// Vertical Blank timer setting
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RIOT.tim64t = VBLANK_TIM64;
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// Doing frame computation during blank
|
||||
TIA.colubk = color++; // Update color
|
||||
|
||||
// Wait for end of Vertical Blank
|
||||
while (RIOT.timint == 0) {}
|
||||
TIA.wsync = 0x00;
|
||||
TIA.vblank = 0x00; // Turn on beam
|
||||
|
||||
// Display frame
|
||||
RIOT.t1024t = KERNAL_T1024;
|
||||
while (RIOT.timint == 0) {}
|
||||
TIA.wsync = 0x00;
|
||||
TIA.vblank = 0x02; // Turn off beam
|
||||
|
||||
// Overscan
|
||||
RIOT.tim64t = OVERSCAN_TIM64;
|
||||
while (RIOT.timint == 0) {}
|
||||
}
|
||||
}
|
||||
@ -205,6 +205,10 @@ static void SetSys (const char* Sys)
|
||||
AbEnd ("Cannot use `module' as a target for the assembler");
|
||||
break;
|
||||
|
||||
case TGT_ATARI2600:
|
||||
NewSymbol ("__ATARI2600__", 1);
|
||||
break;
|
||||
|
||||
case TGT_ATARI5200:
|
||||
NewSymbol ("__ATARI5200__", 1);
|
||||
break;
|
||||
|
||||
@ -161,6 +161,10 @@ static void SetSys (const char* Sys)
|
||||
AbEnd ("Cannot use `module' as a target for the compiler");
|
||||
break;
|
||||
|
||||
case TGT_ATARI2600:
|
||||
DefineNumericMacro ("__ATARI2600__", 1);
|
||||
break;
|
||||
|
||||
case TGT_ATARI5200:
|
||||
DefineNumericMacro ("__ATARI5200__", 1);
|
||||
break;
|
||||
|
||||
@ -145,6 +145,7 @@ static const TargetEntry TargetMap[] = {
|
||||
{ "apple2", TGT_APPLE2 },
|
||||
{ "apple2enh", TGT_APPLE2ENH },
|
||||
{ "atari", TGT_ATARI },
|
||||
{ "atari2600", TGT_ATARI2600 },
|
||||
{ "atari5200", TGT_ATARI5200 },
|
||||
{ "atarixl", TGT_ATARIXL },
|
||||
{ "atmos", TGT_ATMOS },
|
||||
@ -181,6 +182,7 @@ static const TargetProperties PropertyTable[TGT_COUNT] = {
|
||||
{ "none", CPU_6502, BINFMT_BINARY, CTNone },
|
||||
{ "module", CPU_6502, BINFMT_O65, CTNone },
|
||||
{ "atari", CPU_6502, BINFMT_BINARY, CTAtari },
|
||||
{ "atari2600", CPU_6502, BINFMT_BINARY, CTNone },
|
||||
{ "atari5200", CPU_6502, BINFMT_BINARY, CTAtari },
|
||||
{ "atarixl", CPU_6502, BINFMT_BINARY, CTAtari },
|
||||
{ "vic20", CPU_6502, BINFMT_BINARY, CTPET },
|
||||
|
||||
@ -55,6 +55,7 @@ typedef enum {
|
||||
TGT_NONE,
|
||||
TGT_MODULE,
|
||||
TGT_ATARI,
|
||||
TGT_ATARI2600,
|
||||
TGT_ATARI5200,
|
||||
TGT_ATARIXL,
|
||||
TGT_VIC20,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user