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Merge pull request #365 from FlorentFlament/master
Add C support for Atari 2600 (VCS)
This commit is contained in:
Oliver Schmidt
GitHub
commit
977bca922b
7
asminc/atari2600.inc
Normal file
7
asminc/atari2600.inc
Normal file
@ -0,0 +1,7 @@
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; Atari 2600 TIA & RIOT read / write registers
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;
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; Florent Flament (contact@florentflament.com), 2017
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; TIA & RIOT registers mapping
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.include "atari2600_tia.inc"
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.include "atari2600_riot.inc"
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20
asminc/atari2600_riot.inc
Normal file
20
asminc/atari2600_riot.inc
Normal file
@ -0,0 +1,20 @@
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; Atari 2600 RIOT read / write registers
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;
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; Source: DASM - vcs.h
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; Details available in: Stella Programmer's Guide by Steve Wright
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;
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; Florent Flament (contact@florentflament.com), 2017
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; Read registers
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SWCHA := $0280
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SWACNT := $0281
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SWCHB := $0282
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SWBCNT := $0283
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INTIM := $0284
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TIMINT := $0285
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; Write registers
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TIM1T := $0294
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TIM8T := $0295
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TIM64T := $0296
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T1024T := $0297
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69
asminc/atari2600_tia.inc
Normal file
69
asminc/atari2600_tia.inc
Normal file
@ -0,0 +1,69 @@
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; Atari 2600 TIA read / write registers
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;
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; Source: DASM - vcs.h
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; Details available in: Stella Programmer's Guide by Steve Wright
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;
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; Florent Flament (contact@florentflament.com), 2017
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; Read registers
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VSYNC := $00
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VBLANK := $01
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WSYNC := $02
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RSYNC := $03
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NUSIZ0 := $04
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NUSIZ1 := $05
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COLUP0 := $06
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COLUP1 := $07
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COLUPF := $08
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COLUBK := $09
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CTRLPF := $0A
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REFP0 := $0B
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REFP1 := $0C
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PF0 := $0D
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PF1 := $0E
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PF2 := $0F
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RESP0 := $10
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RESP1 := $11
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RESM0 := $12
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RESM1 := $13
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RESBL := $14
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AUDC0 := $15
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AUDC1 := $16
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AUDF0 := $17
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AUDF1 := $18
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AUDV0 := $19
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AUDV1 := $1A
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GRP0 := $1B
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GRP1 := $1C
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ENAM0 := $1D
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ENAM1 := $1E
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ENABL := $1F
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HMP0 := $20
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HMP1 := $21
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HMM0 := $22
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HMM1 := $23
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HMBL := $24
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VDELP0 := $25
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VDELP1 := $26
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VDELBL := $27
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RESMP0 := $28
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RESMP1 := $29
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HMOVE := $2A
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HMCLR := $2B
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CXCLR := $2C
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; Write registers
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CXM0P := $00
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CXM1P := $01
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CXP0FB := $02
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CXP1FB := $03
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CXM0FB := $04
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CXM1FB := $05
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CXBLPF := $06
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CXPPMM := $07
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INPT0 := $08
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INPT1 := $09
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INPT2 := $0A
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INPT3 := $0B
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INPT4 := $0C
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INPT5 := $0D
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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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124
doc/atari2600.sgml
Normal file
124
doc/atari2600.sgml
Normal file
@ -0,0 +1,124 @@
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<!doctype linuxdoc system>
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<article>
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<title>Atari 2600 specific information for cc65
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<author>
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<url url="mailto:contact@florentflament.com" name="Florent Flament"><newline>
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<date>2017-01-11
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<abstract>
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An overview over the Atari 2600 runtime system as it is implemented
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for the cc65 C compiler.
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</abstract>
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<!-- Table of contents -->
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<toc>
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<!-- Begin the document -->
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<sect>Overview<p>
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This file contains an overview of the Atari 2600 runtime system as it
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comes with the cc65 C compiler. It describes the memory layout, Atari
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2600 specific header files and any pitfalls specific to that platform.
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<sect>Binary format<p>
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The default binary output format generated by the linker for the Atari
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2600 target is a 4K cartridge image.
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<sect>Memory layout<p>
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cc65 generated programs with the default setup can use RAM from
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$0080 to $00FF - __STACKSIZE__, where __STACKSIZE__ is
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the size of the system stack with a default value of 16 bytes. The
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size of the system stack can be customized by defining the
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__STACKSIZE__ linker variable.
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Special locations:
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<descrip>
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<tag/Stack/ The C runtime stack is located at $00FF -
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__STACKSIZE__ and growing downwards.
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<tag/Heap/ The C heap is located at $0080 and grows upwards.
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</descrip><p>
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<sect>Start-up condition<p>
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When powered-up, the Atari 2600 TIA registers contain random
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values. During the initialization phase, the start-up code needs to
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initialize the TIA registers to sound values (or else the console has
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an unpredictable behavior). In this implementation, zeros are written
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to all of TIA registers during the start-up phase.
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Note that RIOT registers (mostly timers) are left uninitialized, as
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they don't have any consequence on the console behavior.
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<sect>Platform specific header files<p>
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Programs containing Atari 2600 specific code may use the
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<tt/atari2600.h/ header file.
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The following pseudo variables declared in the <tt/atari2600.h/ header
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file allow access to the Atari 2600 TIA & RIOT chips registers.
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<descrip>
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<tag><tt/TIA/</tag> The <tt/TIA/ structure allows read/write access
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to the Atari 2600 TIA chip registers. See the <tt/_tia.h/ header
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file located in the include directory for the declaration of the
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structure. Also refer to the Stella Programmer's Guide by Steve
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Wright for a detailed description of the chip and its registers.
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<tag><tt/RIOT/</tag> The <tt/RIOT/ structure allows read/write
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access to the Atari 2600 RIOT chip registers. See the
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<tt/_riot.h/ header file located in the include directory for the
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declaration of the structure. Also refer to the Stella Programmer's
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Guide by Steve Wright for a detailed description of the chip and its
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registers.
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</descrip><p>
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<sect>Loadable drivers<p>
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There are no drivers for the Atari 2600.
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<sect>Limitations<p>
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TBD
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<sect>Other hints<p>
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One may write a custom linker configuration file to tune the memory
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layout of a program. See the <tt/atari2600.cfg/ file in the cfg
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directory as a starting point.
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<sect>License<p>
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This software is provided 'as-is', without any expressed or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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<enum>
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<item> The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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<item> Altered source versions must be plainly marked as such, and must not
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be misrepresented as being the original software.
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<item> This notice may not be removed or altered from any source
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distribution.
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</enum>
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</article>
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@ -4583,6 +4583,7 @@ compiler, depending on the target system selected:
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<itemize>
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<item><tt/__APPLE2__/ - Target system is <tt/apple2/ or <tt/apple2enh/
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<item><tt/__APPLE2ENH__/ - Target system is <tt/apple2enh/
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<item><tt/__ATARI2600__/ - Target system is <tt/atari2600/
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<item><tt/__ATARI5200__/ - Target system is <tt/atari5200/
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<item><tt/__ATARI__/ - Target system is <tt/atari/ or <tt/atarixl/
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<item><tt/__ATARIXL__/ - Target system is <tt/atarixl/
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@ -752,6 +752,10 @@ The compiler defines several macros at startup:
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This macro is defined if the target is the enhanced Apple //e (-t apple2enh).
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<tag><tt>__ATARI2600__</tt></tag>
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This macro is defined if the target is the Atari 2600 game console.
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<tag><tt>__ATARI5200__</tt></tag>
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This macro is defined if the target is the Atari 5200 game console.
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@ -116,6 +116,9 @@
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<tag><htmlurl url="atari.html" name="atari.html"></tag>
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Topics specific to the Atari 8-bit machines.
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<tag><htmlurl url="atari2600.html" name="atari2600.html"></tag>
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Topics specific to the Atari 2600 Game Console.
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<tag><htmlurl url="atari5200.html" name="atari5200.html"></tag>
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Topics specific to the Atari 5200 Game Console.
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@ -335,6 +335,35 @@ your harddrive directly.
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to the DOS menu. Your C program should wait for a keypress if you want to see
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any output.
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<sect2>Stella<p>
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Available at <url
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url="http://stella.sourceforge.net">:
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Stella is a multi-platform Atari 2600 VCS emulator. The latest version
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is available on the emulator's website. It is also available through
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the package manager of most Linux distributions (Fedora, Ubuntu, ..).
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Compile the Atari 2600 sample with
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<tscreen><verb>
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make SYS=atari2600 samples
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</verb></tscreen>
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Then execute it with
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<tscreen><verb>
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stella samples/atari2600hello
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</verb></tscreen>
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<sect2>Harmony Cartridge<p>
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Available at <url
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url="http://harmony.atariage.com/Site/Harmony.html">:
|
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|
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The Harmony Cartridge allows running any Atari 2600 binary on real
|
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hardware. The binary must be copied on an SD card, to be inserted in
|
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the Harmony Cartridge. It can then be inserted on an Atari 2600
|
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console, and run any binary on the SD card.
|
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|
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|
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<sect1>Atmos
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|
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@ -156,6 +156,7 @@ Here is a description of all of the command-line options:
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<item>module
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<item>apple2
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<item>apple2enh
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<item>atari2600
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<item>atari
|
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<item>atarixl
|
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<item>atmos
|
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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 */
|
||||
/* */
|
||||
/* 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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|
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unsigned char unused[14];
|
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|
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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 */
|
||||
/* */
|
||||
/* Source: DASM - vcs.h */
|
||||
/* */
|
||||
/* Florent Flament (contact@florentflament.com), 2017 */
|
||||
/* */
|
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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;
|
||||
};
|
||||
union {
|
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unsigned char rsync;
|
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unsigned char cxp1fb;
|
||||
};
|
||||
union {
|
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unsigned char nusiz0;
|
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unsigned char cxm0fb;
|
||||
};
|
||||
union {
|
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unsigned char nusiz1;
|
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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
26
include/atari2600.h
Normal file
@ -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 */
|
||||
@ -19,6 +19,7 @@ TARGETS = apple2 \
|
||||
apple2enh \
|
||||
atari \
|
||||
atarixl \
|
||||
atari2600 \
|
||||
atari5200 \
|
||||
atmos \
|
||||
$(CBMS) \
|
||||
|
||||
49
libsrc/atari2600/crt0.s
Normal file
49
libsrc/atari2600/crt0.s
Normal file
@ -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
|
||||
162
libsrc/atari2600/ctype.s
Normal file
162
libsrc/atari2600/ctype.s
Normal file
@ -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
|
||||
|
||||
|
||||
|
||||
@ -147,6 +147,9 @@ EXELIST_atari = \
|
||||
|
||||
EXELIST_atarixl = $(EXELIST_atari)
|
||||
|
||||
EXELIST_atari2600 = \
|
||||
atari2600hello
|
||||
|
||||
# --------------------------------------------------------------------------
|
||||
# Rules to make the binaries and the disk
|
||||
|
||||
|
||||
56
samples/atari2600hello.c
Normal file
56
samples/atari2600hello.c
Normal file
@ -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) {}
|
||||
}
|
||||
}
|
||||
@ -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