diff --git a/asminc/atari2600.inc b/asminc/atari2600.inc new file mode 100644 index 000000000..a20926d08 --- /dev/null +++ b/asminc/atari2600.inc @@ -0,0 +1,7 @@ +; 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" diff --git a/asminc/atari2600_riot.inc b/asminc/atari2600_riot.inc new file mode 100644 index 000000000..a2c6ef633 --- /dev/null +++ b/asminc/atari2600_riot.inc @@ -0,0 +1,20 @@ +; 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 diff --git a/asminc/atari2600_tia.inc b/asminc/atari2600_tia.inc new file mode 100644 index 000000000..57c27adba --- /dev/null +++ b/asminc/atari2600_tia.inc @@ -0,0 +1,69 @@ +; 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 diff --git a/cfg/atari2600.cfg b/cfg/atari2600.cfg new file mode 100644 index 000000000..106edeb30 --- /dev/null +++ b/cfg/atari2600.cfg @@ -0,0 +1,22 @@ +# 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; +} diff --git a/doc/atari2600.sgml b/doc/atari2600.sgml new file mode 100644 index 000000000..ae1b6cb5c --- /dev/null +++ b/doc/atari2600.sgml @@ -0,0 +1,124 @@ + + +
+ +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 +$0080 to $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 $00FF - + __STACKSIZE__ and growing downwards. + + <tag/Heap/ The C heap is located at $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> diff --git a/doc/ca65.sgml b/doc/ca65.sgml index 2c43a9b50..da0233c62 100644 --- a/doc/ca65.sgml +++ b/doc/ca65.sgml @@ -4583,6 +4583,7 @@ compiler, depending on the target system selected: <itemize> <item><tt/__APPLE2__/ - Target system is <tt/apple2/ or <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/__ATARI__/ - Target system is <tt/atari/ or <tt/atarixl/ <item><tt/__ATARIXL__/ - Target system is <tt/atarixl/ diff --git a/doc/cc65.sgml b/doc/cc65.sgml index 3e59d4cf0..80dba89b8 100644 --- a/doc/cc65.sgml +++ b/doc/cc65.sgml @@ -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). + <tag><tt>__ATARI2600__</tt></tag> + + This macro is defined if the target is the Atari 2600 game console. + <tag><tt>__ATARI5200__</tt></tag> This macro is defined if the target is the Atari 5200 game console. diff --git a/doc/index.sgml b/doc/index.sgml index 44b58ef5e..9b7ab794e 100644 --- a/doc/index.sgml +++ b/doc/index.sgml @@ -116,6 +116,9 @@ <tag><htmlurl url="atari.html" name="atari.html"></tag> 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> Topics specific to the Atari 5200 Game Console. diff --git a/doc/intro.sgml b/doc/intro.sgml index d92fd1d20..bb8965c60 100644 --- a/doc/intro.sgml +++ b/doc/intro.sgml @@ -335,6 +335,35 @@ your harddrive directly. to the DOS menu. Your C program should wait for a keypress if you want to see 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 diff --git a/doc/ld65.sgml b/doc/ld65.sgml index 448157ce0..5687aa8ab 100644 --- a/doc/ld65.sgml +++ b/doc/ld65.sgml @@ -156,6 +156,7 @@ Here is a description of all of the command-line options: <item>module <item>apple2 <item>apple2enh + <item>atari2600 <item>atari <item>atarixl <item>atmos diff --git a/include/_riot.h b/include/_riot.h new file mode 100644 index 000000000..7c431127c --- /dev/null +++ b/include/_riot.h @@ -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; +}; diff --git a/include/_tia.h b/include/_tia.h new file mode 100644 index 000000000..c89c04d6c --- /dev/null +++ b/include/_tia.h @@ -0,0 +1,100 @@ +/*****************************************************************************/ +/* */ +/* 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; +}; diff --git a/include/atari2600.h b/include/atari2600.h new file mode 100644 index 000000000..1eb51a2dd --- /dev/null +++ b/include/atari2600.h @@ -0,0 +1,26 @@ +/*****************************************************************************/ +/* */ +/* 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 */ diff --git a/libsrc/Makefile b/libsrc/Makefile index 99f120f3a..6b6a8fce8 100644 --- a/libsrc/Makefile +++ b/libsrc/Makefile @@ -19,6 +19,7 @@ TARGETS = apple2 \ apple2enh \ atari \ atarixl \ + atari2600 \ atari5200 \ atmos \ $(CBMS) \ diff --git a/libsrc/atari2600/crt0.s b/libsrc/atari2600/crt0.s new file mode 100644 index 000000000..4f09a0a5a --- /dev/null +++ b/libsrc/atari2600/crt0.s @@ -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 diff --git a/libsrc/atari2600/ctype.s b/libsrc/atari2600/ctype.s new file mode 100644 index 000000000..1892554fd --- /dev/null +++ b/libsrc/atari2600/ctype.s @@ -0,0 +1,162 @@ +; +; 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 + + + diff --git a/samples/Makefile b/samples/Makefile index 3a60798da..abd304b14 100644 --- a/samples/Makefile +++ b/samples/Makefile @@ -147,6 +147,9 @@ EXELIST_atari = \ EXELIST_atarixl = $(EXELIST_atari) +EXELIST_atari2600 = \ + atari2600hello + # -------------------------------------------------------------------------- # Rules to make the binaries and the disk diff --git a/samples/atari2600hello.c b/samples/atari2600hello.c new file mode 100644 index 000000000..e4f7893b7 --- /dev/null +++ b/samples/atari2600hello.c @@ -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) {} + } +} diff --git a/src/ca65/main.c b/src/ca65/main.c index d6c364e4b..1317f26cc 100644 --- a/src/ca65/main.c +++ b/src/ca65/main.c @@ -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; diff --git a/src/cc65/main.c b/src/cc65/main.c index afbec43d7..2a82e5302 100644 --- a/src/cc65/main.c +++ b/src/cc65/main.c @@ -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; diff --git a/src/common/target.c b/src/common/target.c index 99a134c43..42db5dee3 100644 --- a/src/common/target.c +++ b/src/common/target.c @@ -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 }, diff --git a/src/common/target.h b/src/common/target.h index 4115ae21a..a5cb44b98 100644 --- a/src/common/target.h +++ b/src/common/target.h @@ -55,6 +55,7 @@ typedef enum { TGT_NONE, TGT_MODULE, TGT_ATARI, + TGT_ATARI2600, TGT_ATARI5200, TGT_ATARIXL, TGT_VIC20,