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Merge pull request #365 from FlorentFlament/master

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Add C support for Atari 2600 (VCS)
This commit is contained in:
Oliver Schmidt 2017-01-16 16:26:48 +01:00 committed by GitHub
commit 977bca922b
22 changed files with 714 additions and 0 deletions
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7
asminc/atari2600.inc Normal file
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; Atari 2600 TIA & RIOT read / write registers
;
; Florent Flament (contact@florentflament.com), 2017
; TIA & RIOT registers mapping
.include "atari2600_tia.inc"
.include "atari2600_riot.inc"

20
asminc/atari2600_riot.inc Normal file
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; Atari 2600 RIOT read / write registers
;
; Source: DASM - vcs.h
; Details available in: Stella Programmer's Guide by Steve Wright
;
; Florent Flament (contact@florentflament.com), 2017
; Read registers
SWCHA := $0280
SWACNT := $0281
SWCHB := $0282
SWBCNT := $0283
INTIM := $0284
TIMINT := $0285
; Write registers
TIM1T := $0294
TIM8T := $0295
TIM64T := $0296
T1024T := $0297

69
asminc/atari2600_tia.inc Normal file
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; Atari 2600 TIA read / write registers
;
; Source: DASM - vcs.h
; Details available in: Stella Programmer's Guide by Steve Wright
;
; Florent Flament (contact@florentflament.com), 2017
; Read registers
VSYNC := $00
VBLANK := $01
WSYNC := $02
RSYNC := $03
NUSIZ0 := $04
NUSIZ1 := $05
COLUP0 := $06
COLUP1 := $07
COLUPF := $08
COLUBK := $09
CTRLPF := $0A
REFP0 := $0B
REFP1 := $0C
PF0 := $0D
PF1 := $0E
PF2 := $0F
RESP0 := $10
RESP1 := $11
RESM0 := $12
RESM1 := $13
RESBL := $14
AUDC0 := $15
AUDC1 := $16
AUDF0 := $17
AUDF1 := $18
AUDV0 := $19
AUDV1 := $1A
GRP0 := $1B
GRP1 := $1C
ENAM0 := $1D
ENAM1 := $1E
ENABL := $1F
HMP0 := $20
HMP1 := $21
HMM0 := $22
HMM1 := $23
HMBL := $24
VDELP0 := $25
VDELP1 := $26
VDELBL := $27
RESMP0 := $28
RESMP1 := $29
HMOVE := $2A
HMCLR := $2B
CXCLR := $2C
; Write registers
CXM0P := $00
CXM1P := $01
CXP0FB := $02
CXP1FB := $03
CXM0FB := $04
CXM1FB := $05
CXBLPF := $06
CXPPMM := $07
INPT0 := $08
INPT1 := $09
INPT2 := $0A
INPT3 := $0B
INPT4 := $0C
INPT5 := $0D

22
cfg/atari2600.cfg Normal file
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# Atari VCS 2600 linker configuration file for cc65
#
# Florent Flament (contact@florentflament.com), 2017
SYMBOLS {
__STACKSIZE__: type = weak, value = $0010; # 16 Bytes system stack
}
MEMORY {
RAM: file = "", start = $0080, size = $0080 - __STACKSIZE__, define = yes;
ROM: file = %O, start = $F000, size = $1000, fill = yes, fillval = $FF;
}
SEGMENTS {
ZEROPAGE: load = RAM, type = zp;
STARTUP: load = ROM, type = ro;
CODE: load = ROM, type = ro;
RODATA: load = ROM, type = ro, optional = yes;
DATA: load = ROM, run = RAM, type = rw, optional = yes, define = yes;
BSS: load = RAM, type = bss, optional = yes;
VECTORS: load = ROM, type = ro, start = $FFFA;
}

124
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<!doctype linuxdoc system>
<article>
<title>Atari 2600 specific information for cc65
<author>
<url url="mailto:contact@florentflament.com" name="Florent Flament"><newline>
<date>2017-01-11
<abstract>
An overview over the Atari 2600 runtime system as it is implemented
for the cc65 C compiler.
</abstract>
<!-- Table of contents -->
<toc>
<!-- Begin the document -->
<sect>Overview<p>
This file contains an overview of the Atari 2600 runtime system as it
comes with the cc65 C compiler. It describes the memory layout, Atari
2600 specific header files and any pitfalls specific to that platform.
<sect>Binary format<p>
The default binary output format generated by the linker for the Atari
2600 target is a 4K cartridge image.
<sect>Memory layout<p>
cc65 generated programs with the default setup can use RAM from
&dollar;0080 to &dollar;00FF - __STACKSIZE__, where __STACKSIZE__ is
the size of the system stack with a default value of 16 bytes. The
size of the system stack can be customized by defining the
__STACKSIZE__ linker variable.
Special locations:
<descrip>
<tag/Stack/ The C runtime stack is located at &dollar;00FF -
__STACKSIZE__ and growing downwards.
<tag/Heap/ The C heap is located at &dollar;0080 and grows upwards.
</descrip><p>
<sect>Start-up condition<p>
When powered-up, the Atari 2600 TIA registers contain random
values. During the initialization phase, the start-up code needs to
initialize the TIA registers to sound values (or else the console has
an unpredictable behavior). In this implementation, zeros are written
to all of TIA registers during the start-up phase.
Note that RIOT registers (mostly timers) are left uninitialized, as
they don't have any consequence on the console behavior.
<sect>Platform specific header files<p>
Programs containing Atari 2600 specific code may use the
<tt/atari2600.h/ header file.
The following pseudo variables declared in the <tt/atari2600.h/ header
file allow access to the Atari 2600 TIA & RIOT chips registers.
<descrip>
<tag><tt/TIA/</tag> The <tt/TIA/ structure allows read/write access
to the Atari 2600 TIA chip registers. See the <tt/_tia.h/ header
file located in the include directory for the declaration of the
structure. Also refer to the Stella Programmer's Guide by Steve
Wright for a detailed description of the chip and its registers.
<tag><tt/RIOT/</tag> The <tt/RIOT/ structure allows read/write
access to the Atari 2600 RIOT chip registers. See the
<tt/_riot.h/ header file located in the include directory for the
declaration of the structure. Also refer to the Stella Programmer's
Guide by Steve Wright for a detailed description of the chip and its
registers.
</descrip><p>
<sect>Loadable drivers<p>
There are no drivers for the Atari 2600.
<sect>Limitations<p>
TBD
<sect>Other hints<p>
One may write a custom linker configuration file to tune the memory
layout of a program. See the <tt/atari2600.cfg/ file in the cfg
directory as a starting point.
<sect>License<p>
This software is provided 'as-is', without any expressed or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
<enum>
<item> The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
<item> Altered source versions must be plainly marked as such, and must not
be misrepresented as being the original software.
<item> This notice may not be removed or altered from any source
distribution.
</enum>
</article>

1
doc/ca65.sgml
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@ -4583,6 +4583,7 @@ compiler, depending on the target system selected:
<itemize> <itemize>
<item><tt/__APPLE2__/ - Target system is <tt/apple2/ or <tt/apple2enh/ <item><tt/__APPLE2__/ - Target system is <tt/apple2/ or <tt/apple2enh/
<item><tt/__APPLE2ENH__/ - Target system is <tt/apple2enh/ <item><tt/__APPLE2ENH__/ - Target system is <tt/apple2enh/
<item><tt/__ATARI2600__/ - Target system is <tt/atari2600/
<item><tt/__ATARI5200__/ - Target system is <tt/atari5200/ <item><tt/__ATARI5200__/ - Target system is <tt/atari5200/
<item><tt/__ATARI__/ - Target system is <tt/atari/ or <tt/atarixl/ <item><tt/__ATARI__/ - Target system is <tt/atari/ or <tt/atarixl/
<item><tt/__ATARIXL__/ - Target system is <tt/atarixl/ <item><tt/__ATARIXL__/ - Target system is <tt/atarixl/

4
doc/cc65.sgml
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@ -752,6 +752,10 @@ The compiler defines several macros at startup:
This macro is defined if the target is the enhanced Apple //e (-t apple2enh). This macro is defined if the target is the enhanced Apple //e (-t apple2enh).
<tag><tt>__ATARI2600__</tt></tag>
This macro is defined if the target is the Atari 2600 game console.
<tag><tt>__ATARI5200__</tt></tag> <tag><tt>__ATARI5200__</tt></tag>
This macro is defined if the target is the Atari 5200 game console. This macro is defined if the target is the Atari 5200 game console.

3
doc/index.sgml
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@ -116,6 +116,9 @@
<tag><htmlurl url="atari.html" name="atari.html"></tag> <tag><htmlurl url="atari.html" name="atari.html"></tag>
Topics specific to the Atari 8-bit machines. Topics specific to the Atari 8-bit machines.
<tag><htmlurl url="atari2600.html" name="atari2600.html"></tag>
Topics specific to the Atari 2600 Game Console.
<tag><htmlurl url="atari5200.html" name="atari5200.html"></tag> <tag><htmlurl url="atari5200.html" name="atari5200.html"></tag>
Topics specific to the Atari 5200 Game Console. Topics specific to the Atari 5200 Game Console.

29
doc/intro.sgml
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@ -335,6 +335,35 @@ your harddrive directly.
to the DOS menu. Your C program should wait for a keypress if you want to see to the DOS menu. Your C program should wait for a keypress if you want to see
any output. any output.
<sect2>Stella<p>
Available at <url
url="http://stella.sourceforge.net">:
Stella is a multi-platform Atari 2600 VCS emulator. The latest version
is available on the emulator's website. It is also available through
the package manager of most Linux distributions (Fedora, Ubuntu, ..).
Compile the Atari 2600 sample with
<tscreen><verb>
make SYS=atari2600 samples
</verb></tscreen>
Then execute it with
<tscreen><verb>
stella samples/atari2600hello
</verb></tscreen>
<sect2>Harmony Cartridge<p>
Available at <url
url="http://harmony.atariage.com/Site/Harmony.html">:
The Harmony Cartridge allows running any Atari 2600 binary on real
hardware. The binary must be copied on an SD card, to be inserted in
the Harmony Cartridge. It can then be inserted on an Atari 2600
console, and run any binary on the SD card.
<sect1>Atmos <sect1>Atmos

1
doc/ld65.sgml
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@ -156,6 +156,7 @@ Here is a description of all of the command-line options:
<item>module <item>module
<item>apple2 <item>apple2
<item>apple2enh <item>apple2enh
<item>atari2600
<item>atari <item>atari
<item>atarixl <item>atarixl
<item>atmos <item>atmos

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include/_riot.h Normal file
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@ -0,0 +1,26 @@
/*****************************************************************************/
/* */
/* Atari VCS 2600 RIOT registers addresses */
/* */
/* Source: DASM - vcs.h */
/* */
/* Florent Flament (contact@florentflament.com), 2017 */
/* */
/*****************************************************************************/
/* RIOT registers */
struct __riot {
unsigned char swcha;
unsigned char swacnt;
unsigned char swchb;
unsigned char swbcnt;
unsigned char intim;
unsigned char timint;
unsigned char unused[14];
unsigned char tim1t;
unsigned char tim8t;
unsigned char tim64t;
unsigned char t1024t;
};

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include/_tia.h Normal file
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/*****************************************************************************/
/* */
/* Atari VCS 2600 TIA registers addresses */
/* */
/* Source: DASM - vcs.h */
/* */
/* Florent Flament (contact@florentflament.com), 2017 */
/* */
/*****************************************************************************/
/* TIA write / read registers */
struct __tia {
union {
unsigned char vsync;
unsigned char cxm0p;
};
union {
unsigned char vblank;
unsigned char cxm1p;
};
union {
unsigned char wsync;
unsigned char cxp0fb;
};
union {
unsigned char rsync;
unsigned char cxp1fb;
};
union {
unsigned char nusiz0;
unsigned char cxm0fb;
};
union {
unsigned char nusiz1;
unsigned char cxm1fb;
};
union {
unsigned char colup0;
unsigned char cxblpf;
};
union {
unsigned char colup1;
unsigned char cxppmm;
};
union {
unsigned char colupf;
unsigned char inpt0;
};
union {
unsigned char colubk;
unsigned char inpt1;
};
union {
unsigned char ctrlpf;
unsigned char inpt2;
};
union {
unsigned char refp0;
unsigned char inpt3;
};
union {
unsigned char refp1;
unsigned char inpt4;
};
union {
unsigned char pf0;
unsigned char inpt5;
};
unsigned char pf1;
unsigned char pf2;
unsigned char resp0;
unsigned char resp1;
unsigned char resm0;
unsigned char resm1;
unsigned char resbl;
unsigned char audc0;
unsigned char audc1;
unsigned char audf0;
unsigned char audf1;
unsigned char audv0;
unsigned char audv1;
unsigned char grp0;
unsigned char grp1;
unsigned char enam0;
unsigned char enam1;
unsigned char enabl;
unsigned char hmp0;
unsigned char hmp1;
unsigned char hmm0;
unsigned char hmm1;
unsigned char hmbl;
unsigned char vdelp0;
unsigned char vdelp1;
unsigned char vdelbl;
unsigned char resmp0;
unsigned char resmp1;
unsigned char hmove;
unsigned char hmclr;
unsigned char cxclr;
};

26
include/atari2600.h Normal file
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/*****************************************************************************/
/* */
/* Atari VCS 2600 TIA & RIOT registers addresses */
/* */
/* Source: DASM Version 1.05 - vcs.h */
/* */
/* Florent Flament (contact@florentflament.com), 2017 */
/* */
/*****************************************************************************/
#ifndef _ATARI2600_H
#define _ATARI2600_H
/* Check for errors */
#if !defined(__ATARI2600__)
# error This module may only be used when compiling for the Atari 2600!
#endif
#include <_tia.h>
#define TIA (*(struct __tia*)0x0000)
#include <_riot.h>
#define RIOT (*(struct __riot*)0x0280)
/* End of atari2600.h */
#endif /* #ifndef _ATARI2600_H */

1
libsrc/Makefile
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@ -19,6 +19,7 @@ TARGETS = apple2 \
apple2enh \ apple2enh \
atari \ atari \
atarixl \ atarixl \
atari2600 \
atari5200 \ atari5200 \
atmos \ atmos \
$(CBMS) \ $(CBMS) \

49
libsrc/atari2600/crt0.s Normal file
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@ -0,0 +1,49 @@
; Atari VCS 2600 startup code for cc65
;
; Florent Flament (contact@florentflament.com), 2017
.export _exit
.export __STARTUP__ : absolute = 1
.import __RAM_START__, __RAM_SIZE__
.import copydata
.import _main
.include "zeropage.inc"
.segment "STARTUP"
start:
; Clear decimal mode
cld
; Initialization Loop:
; * Clears Atari 2600 whole memory (128 bytes) including BSS segment
; * Clears TIA registers
; * Sets system stack pointer to $ff (i.e top of zero-page)
ldx #0
txa
clearLoop:
dex
txs
pha
bne clearLoop
; Initialize data
jsr copydata
; Initialize C stack pointer
lda #<(__RAM_START__ + __RAM_SIZE__)
ldx #>(__RAM_START__ + __RAM_SIZE__)
sta sp
stx sp+1
; Call main
jsr _main
_exit: jmp _exit
.segment "VECTORS"
.word start ; NMI
.word start ; Reset
.word start ; IRQ

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libsrc/atari2600/ctype.s Normal file
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;
; Ullrich von Bassewitz, 2003-10-10
;
; Character specification table.
;
.include "ctype.inc"
; The tables are readonly, put them into the rodata segment
.rodata
; The following 256 byte wide table specifies attributes for the isxxx type
; of functions. Doing it by a table means some overhead in space, but it
; has major advantages:
;
; * It is fast. If it weren't for the slow parameter passing of cc65, one
; could even define macros for the isxxx functions (this is usually
; done on other platforms).
;
; * It is highly portable. The only unportable part is the table itself,
; all real code goes into the common library.
;
; * We save some code in the isxxx functions.
__ctype:
.byte CT_CTRL ; 0/00 ___ctrl_@___
.byte CT_CTRL ; 1/01 ___ctrl_A___
.byte CT_CTRL ; 2/02 ___ctrl_B___
.byte CT_CTRL ; 3/03 ___ctrl_C___
.byte CT_CTRL ; 4/04 ___ctrl_D___
.byte CT_CTRL ; 5/05 ___ctrl_E___
.byte CT_CTRL ; 6/06 ___ctrl_F___
.byte CT_CTRL ; 7/07 ___ctrl_G___
.byte CT_CTRL ; 8/08 ___ctrl_H___
.byte CT_CTRL | CT_OTHER_WS | CT_SPACE_TAB
; 9/09 ___ctrl_I___
.byte CT_CTRL | CT_OTHER_WS ; 10/0a ___ctrl_J___
.byte CT_CTRL | CT_OTHER_WS ; 11/0b ___ctrl_K___
.byte CT_CTRL | CT_OTHER_WS ; 12/0c ___ctrl_L___
.byte CT_CTRL | CT_OTHER_WS ; 13/0d ___ctrl_M___
.byte CT_CTRL ; 14/0e ___ctrl_N___
.byte CT_CTRL ; 15/0f ___ctrl_O___
.byte CT_CTRL ; 16/10 ___ctrl_P___
.byte CT_CTRL ; 17/11 ___ctrl_Q___
.byte CT_CTRL ; 18/12 ___ctrl_R___
.byte CT_CTRL ; 19/13 ___ctrl_S___
.byte CT_CTRL ; 20/14 ___ctrl_T___
.byte CT_CTRL ; 21/15 ___ctrl_U___
.byte CT_CTRL ; 22/16 ___ctrl_V___
.byte CT_CTRL ; 23/17 ___ctrl_W___
.byte CT_CTRL ; 24/18 ___ctrl_X___
.byte CT_CTRL ; 25/19 ___ctrl_Y___
.byte CT_CTRL ; 26/1a ___ctrl_Z___
.byte CT_CTRL ; 27/1b ___ctrl_[___
.byte CT_CTRL ; 28/1c ___ctrl_\___
.byte CT_CTRL ; 29/1d ___ctrl_]___
.byte CT_CTRL ; 30/1e ___ctrl_^___
.byte CT_CTRL ; 31/1f ___ctrl_____
.byte CT_SPACE | CT_SPACE_TAB ; 32/20 ___SPACE___
.byte CT_NONE ; 33/21 _____!_____
.byte CT_NONE ; 34/22 _____"_____
.byte CT_NONE ; 35/23 _____#_____
.byte CT_NONE ; 36/24 _____$_____
.byte CT_NONE ; 37/25 _____%_____
.byte CT_NONE ; 38/26 _____&_____
.byte CT_NONE ; 39/27 _____'_____
.byte CT_NONE ; 40/28 _____(_____
.byte CT_NONE ; 41/29 _____)_____
.byte CT_NONE ; 42/2a _____*_____
.byte CT_NONE ; 43/2b _____+_____
.byte CT_NONE ; 44/2c _____,_____
.byte CT_NONE ; 45/2d _____-_____
.byte CT_NONE ; 46/2e _____._____
.byte CT_NONE ; 47/2f _____/_____
.byte CT_DIGIT | CT_XDIGIT ; 48/30 _____0_____
.byte CT_DIGIT | CT_XDIGIT ; 49/31 _____1_____
.byte CT_DIGIT | CT_XDIGIT ; 50/32 _____2_____
.byte CT_DIGIT | CT_XDIGIT ; 51/33 _____3_____
.byte CT_DIGIT | CT_XDIGIT ; 52/34 _____4_____
.byte CT_DIGIT | CT_XDIGIT ; 53/35 _____5_____
.byte CT_DIGIT | CT_XDIGIT ; 54/36 _____6_____
.byte CT_DIGIT | CT_XDIGIT ; 55/37 _____7_____
.byte CT_DIGIT | CT_XDIGIT ; 56/38 _____8_____
.byte CT_DIGIT | CT_XDIGIT ; 57/39 _____9_____
.byte CT_NONE ; 58/3a _____:_____
.byte CT_NONE ; 59/3b _____;_____
.byte CT_NONE ; 60/3c _____<_____
.byte CT_NONE ; 61/3d _____=_____
.byte CT_NONE ; 62/3e _____>_____
.byte CT_NONE ; 63/3f _____?_____
.byte CT_NONE ; 64/40 _____@_____
.byte CT_UPPER | CT_XDIGIT ; 65/41 _____A_____
.byte CT_UPPER | CT_XDIGIT ; 66/42 _____B_____
.byte CT_UPPER | CT_XDIGIT ; 67/43 _____C_____
.byte CT_UPPER | CT_XDIGIT ; 68/44 _____D_____
.byte CT_UPPER | CT_XDIGIT ; 69/45 _____E_____
.byte CT_UPPER | CT_XDIGIT ; 70/46 _____F_____
.byte CT_UPPER ; 71/47 _____G_____
.byte CT_UPPER ; 72/48 _____H_____
.byte CT_UPPER ; 73/49 _____I_____
.byte CT_UPPER ; 74/4a _____J_____
.byte CT_UPPER ; 75/4b _____K_____
.byte CT_UPPER ; 76/4c _____L_____
.byte CT_UPPER ; 77/4d _____M_____
.byte CT_UPPER ; 78/4e _____N_____
.byte CT_UPPER ; 79/4f _____O_____
.byte CT_UPPER ; 80/50 _____P_____
.byte CT_UPPER ; 81/51 _____Q_____
.byte CT_UPPER ; 82/52 _____R_____
.byte CT_UPPER ; 83/53 _____S_____
.byte CT_UPPER ; 84/54 _____T_____
.byte CT_UPPER ; 85/55 _____U_____
.byte CT_UPPER ; 86/56 _____V_____
.byte CT_UPPER ; 87/57 _____W_____
.byte CT_UPPER ; 88/58 _____X_____
.byte CT_UPPER ; 89/59 _____Y_____
.byte CT_UPPER ; 90/5a _____Z_____
.byte CT_NONE ; 91/5b _____[_____
.byte CT_NONE ; 92/5c _____\_____
.byte CT_NONE ; 93/5d _____]_____
.byte CT_NONE ; 94/5e _____^_____
.byte CT_NONE ; 95/5f _UNDERLINE_
.byte CT_NONE ; 96/60 ___grave___
.byte CT_LOWER | CT_XDIGIT ; 97/61 _____a_____
.byte CT_LOWER | CT_XDIGIT ; 98/62 _____b_____
.byte CT_LOWER | CT_XDIGIT ; 99/63 _____c_____
.byte CT_LOWER | CT_XDIGIT ; 100/64 _____d_____
.byte CT_LOWER | CT_XDIGIT ; 101/65 _____e_____
.byte CT_LOWER | CT_XDIGIT ; 102/66 _____f_____
.byte CT_LOWER ; 103/67 _____g_____
.byte CT_LOWER ; 104/68 _____h_____
.byte CT_LOWER ; 105/69 _____i_____
.byte CT_LOWER ; 106/6a _____j_____
.byte CT_LOWER ; 107/6b _____k_____
.byte CT_LOWER ; 108/6c _____l_____
.byte CT_LOWER ; 109/6d _____m_____
.byte CT_LOWER ; 110/6e _____n_____
.byte CT_LOWER ; 111/6f _____o_____
.byte CT_LOWER ; 112/70 _____p_____
.byte CT_LOWER ; 113/71 _____q_____
.byte CT_LOWER ; 114/72 _____r_____
.byte CT_LOWER ; 115/73 _____s_____
.byte CT_LOWER ; 116/74 _____t_____
.byte CT_LOWER ; 117/75 _____u_____
.byte CT_LOWER ; 118/76 _____v_____
.byte CT_LOWER ; 119/77 _____w_____
.byte CT_LOWER ; 120/78 _____x_____
.byte CT_LOWER ; 121/79 _____y_____
.byte CT_LOWER ; 122/7a _____z_____
.byte CT_NONE ; 123/7b _____{_____
.byte CT_NONE ; 124/7c _____|_____
.byte CT_NONE ; 125/7d _____}_____
.byte CT_NONE ; 126/7e _____~_____
.byte CT_OTHER_WS ; 127/7f ____DEL____
.res 128, CT_NONE ; 128-255

3
samples/Makefile
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@ -147,6 +147,9 @@ EXELIST_atari = \
EXELIST_atarixl = $(EXELIST_atari) EXELIST_atarixl = $(EXELIST_atari)
EXELIST_atari2600 = \
atari2600hello
# -------------------------------------------------------------------------- # --------------------------------------------------------------------------
# Rules to make the binaries and the disk # Rules to make the binaries and the disk

56
samples/atari2600hello.c Normal file
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@ -0,0 +1,56 @@
/*****************************************************************************/
/* */
/* Atari VCS 2600 sample C program */
/* */
/* Florent Flament (contact@florentflament.com), 2017 */
/* */
/*****************************************************************************/
#include <atari2600.h>
// PAL Timings
// Roughly computed based on Stella Programmer's guide (Steve Wright)
// scanlines count per section.
#define VBLANK_TIM64 51 // 45 lines * 76 cycles/line / 64 cycles/tick
#define KERNAL_T1024 17 // 228 lines * 76 cycles/line / 1024 cycles/tick
#define OVERSCAN_TIM64 42 // 36 lines * 76 cycles/line / 64 cycles/tick
// Testing memory zones
const unsigned char rodata_v[] = "Hello!";
unsigned char data_v = 0x77;
unsigned char bss_v;
void main(void) {
unsigned char color = 0x79; // Stack variable
bss_v = 0x88; // Testing BSS variable
for/*ever*/(;;) {
// Vertical Sync signal
TIA.vsync = 0x02;
TIA.wsync = 0x00;
TIA.wsync = 0x00;
TIA.wsync = 0x00;
TIA.vsync = 0x00;
// Vertical Blank timer setting
RIOT.tim64t = VBLANK_TIM64;
// 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) {}
}
}

4
src/ca65/main.c
View File

@ -205,6 +205,10 @@ static void SetSys (const char* Sys)
AbEnd ("Cannot use `module' as a target for the assembler"); AbEnd ("Cannot use `module' as a target for the assembler");
break; break;
case TGT_ATARI2600:
NewSymbol ("__ATARI2600__", 1);
break;
case TGT_ATARI5200: case TGT_ATARI5200:
NewSymbol ("__ATARI5200__", 1); NewSymbol ("__ATARI5200__", 1);
break; break;

4
src/cc65/main.c
View File

@ -161,6 +161,10 @@ static void SetSys (const char* Sys)
AbEnd ("Cannot use `module' as a target for the compiler"); AbEnd ("Cannot use `module' as a target for the compiler");
break; break;
case TGT_ATARI2600:
DefineNumericMacro ("__ATARI2600__", 1);
break;
case TGT_ATARI5200: case TGT_ATARI5200:
DefineNumericMacro ("__ATARI5200__", 1); DefineNumericMacro ("__ATARI5200__", 1);
break; break;

2
src/common/target.c
View File

@ -145,6 +145,7 @@ static const TargetEntry TargetMap[] = {
{ "apple2", TGT_APPLE2 }, { "apple2", TGT_APPLE2 },
{ "apple2enh", TGT_APPLE2ENH }, { "apple2enh", TGT_APPLE2ENH },
{ "atari", TGT_ATARI }, { "atari", TGT_ATARI },
{ "atari2600", TGT_ATARI2600 },
{ "atari5200", TGT_ATARI5200 }, { "atari5200", TGT_ATARI5200 },
{ "atarixl", TGT_ATARIXL }, { "atarixl", TGT_ATARIXL },
{ "atmos", TGT_ATMOS }, { "atmos", TGT_ATMOS },
@ -181,6 +182,7 @@ static const TargetProperties PropertyTable[TGT_COUNT] = {
{ "none", CPU_6502, BINFMT_BINARY, CTNone }, { "none", CPU_6502, BINFMT_BINARY, CTNone },
{ "module", CPU_6502, BINFMT_O65, CTNone }, { "module", CPU_6502, BINFMT_O65, CTNone },
{ "atari", CPU_6502, BINFMT_BINARY, CTAtari }, { "atari", CPU_6502, BINFMT_BINARY, CTAtari },
{ "atari2600", CPU_6502, BINFMT_BINARY, CTNone },
{ "atari5200", CPU_6502, BINFMT_BINARY, CTAtari }, { "atari5200", CPU_6502, BINFMT_BINARY, CTAtari },
{ "atarixl", CPU_6502, BINFMT_BINARY, CTAtari }, { "atarixl", CPU_6502, BINFMT_BINARY, CTAtari },
{ "vic20", CPU_6502, BINFMT_BINARY, CTPET }, { "vic20", CPU_6502, BINFMT_BINARY, CTPET },

1
src/common/target.h
View File

@ -55,6 +55,7 @@ typedef enum {
TGT_NONE, TGT_NONE,
TGT_MODULE, TGT_MODULE,
TGT_ATARI, TGT_ATARI,
TGT_ATARI2600,
TGT_ATARI5200, TGT_ATARI5200,
TGT_ATARIXL, TGT_ATARIXL,
TGT_VIC20, TGT_VIC20,