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Merge pull request #1692 from karrika/atari7800

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#805 Atari7800 target
This commit is contained in:
Bob Andrews 2022-03-20 20:39:36 +01:00 • committed by GitHub
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1
README.md
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@ -27,6 +27,7 @@ including
- the Atari 8-bit machines.
- the Atari 2600 console.
- the Atari 5200 console.
- the Atari 7800 console.
- GEOS for the C64, C128 and Apple //e.
- the Bit Corporation Gamate console.
- the NEC PC-Engine (aka TurboGrafx-16) console.

8
asminc/atari7800.inc Normal file
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@ -0,0 +1,8 @@
; Atari 7800 TIA & RIOT read / write registers
;
; Karri Kaksonen (karri@sipo.fi), 2022
; TIA, RIOT & MARIA registers mapping
.include "atari7800_tia.inc"
.include "atari7800_riot.inc"
.include "atari7800_maria.inc"

39
asminc/atari7800_maria.inc Normal file
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@ -0,0 +1,39 @@
; Atari 7800 MARIA read / write registers
;
; Read registers
BKGRND := $20
P0C1 := $21
P0C2 := $22
P0C3 := $23
MWSYNC := $24
P1C1 := $25
P1C2 := $26
P1C3 := $27
MSTAT := $28
P2C1 := $29
P2C2 := $2A
P2C3 := $2B
DPPH := $2C
P3C1 := $2D
P3C2 := $2E
P3C3 := $2F
DPPL := $30
P4C1 := $31
P4C2 := $32
P4C3 := $33
CHBASE := $34
P5C1 := $35
P5C2 := $36
P5C3 := $37
OFFSET := $38
P6C1 := $39
P6C2 := $3A
P6C3 := $3B
CTRL := $3C
P7C1 := $3D
P7C2 := $3E
P7C3 := $3F
; Write registers

20
asminc/atari7800_riot.inc Normal file
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@ -0,0 +1,20 @@
; Atari 7800 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
CTLSWA := $0281
SWCHB := $0282
CTLSWB := $0283
INTIM := $0284
TIMINT := $0285
; Write registers
TIM1T := $0294
TIM8T := $0295
TIM64T := $0296
T1024T := $0297

69
asminc/atari7800_tia.inc Normal file
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@ -0,0 +1,69 @@
; Atari 7800 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

67
cfg/atari7800.cfg Normal file
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@ -0,0 +1,67 @@
# Atari VCS 7800 linker configuration file for cc65
# In order to add the a78 header to the build you can add
# "--force-import __EXEHDR__" to the command line
SYMBOLS {
__STACKSIZE__: type = weak, value = $0600; # C stack
__CARTSIZE__: type = weak, value = $8000;
__VEC_BOTTOM__: value = $fffa, type = export;
__VEC_SIZE__: value = $6, type = export;
__ENCRYPT_BOTTOM__: value = $ff7a, type = export;
__ENCRYPT_SIZE__: value = $80, type = export;
__MEMORY_TOP__: value = __ENCRYPT_BOTTOM__, type = export;
__INIT_SIZE__: value = 69, type = export;
__MEMORY_INIT__: value = __MEMORY_TOP__ - __INIT_SIZE__, type = export;
__MEMORY_BOTTOM__: value = $10000 - __CARTSIZE__, type = weak;
__FREE_ROM_SIZE__: value = __MEMORY_INIT__ - __MEMORY_BOTTOM__, type = export;
}
MEMORY {
ZP: file = "", define = yes, start = $0040, size = $00C0, type = rw;
SP: file = "", define = yes, start = $0140, size = $00C0, type = rw;
RAM1: file = "", define = yes, start = $1800, size = $0840, type = rw;
RAM2: file = "", define = yes, start = $2100, size = $0040, type = rw;
RAM3: file = "", define = yes, start = $2200, size = $0600, type = rw;
# For emulators you also need a header file
HEADER: file = %O, start = $0000, size = 128;
# "Normal" cartridge rom. Multiple banks arent supported
# by this script. You may change the rom size, but keep
# two things in mind:
# - start must be a multiple of $1000
# - ROM must end at $ff79
ROM: file = %O, define = yes, start = __MEMORY_BOTTOM__, size = __FREE_ROM_SIZE__, type = ro, fill = yes, fillval = $ff;
ROMS: file = %O, define = yes, start = __MEMORY_INIT__, size = __INIT_SIZE__, type = ro, fill = yes, fillval = $ff;
# Encryption stuff
ROME: file = %O, start = __ENCRYPT_BOTTOM__, size = __ENCRYPT_SIZE__, type = ro, fill = yes, fillval = $ff;
# Interrupt vectors
ROMV: file = %O, start = __VEC_BOTTOM__, size = __VEC_SIZE__, type = ro, fill = yes, fillval = $ff;
}
SEGMENTS {
ZEROPAGE: load = ZP, type = zp;
EXEHDR: load = HEADER, type = ro, optional = yes;
STARTUP: load = ROMS, type = ro, define = yes;
ONCE: load = ROMS, type = ro, define = yes;
CODE: load = ROM, type = ro, define = yes;
RODATA: load = ROM, type = ro, define = yes, align = 256;
DATA: load = ROM, run = RAM1, type = rw, define = yes;
BSS: load = RAM1, type = bss, define = yes;
VECTORS: load = ROMV, type = ro, define = yes;
ENCRYPTION: load = ROME, type = ro define = yes;
}
FEATURES {
CONDES: type = constructor,
label = __CONSTRUCTOR_TABLE__,
count = __CONSTRUCTOR_COUNT__,
segment = ONCE;
CONDES: type = destructor,
label = __DESTRUCTOR_TABLE__,
count = __DESTRUCTOR_COUNT__,
segment = RODATA;
CONDES: type = interruptor,
label = __INTERRUPTOR_TABLE__,
count = __INTERRUPTOR_COUNT__,
segment = RODATA,
import = __CALLIRQ__;
}

157
doc/atari7800.sgml Normal file
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@ -0,0 +1,157 @@
<!doctype linuxdoc system>
<article>
<title>Atari 7800 specific information for cc65
<author>
<url url="mailto:karri@sipo.fi" name="Karri Kaksonen"><newline>
<abstract>
An overview over the Atari 7800 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 7800 runtime system as it
comes with the cc65 C compiler. It describes the memory layout, Atari
7800 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
7800 target is a 48K cartridge image.
<sect>A78 header<p>
There is lots of different cart hardware available for the atari7800.
Some carts have ROM, RAM, sound hardware, non-volatile high score chips.
In order to know what kind of hardware the cart build requires there is
a header file of 128 bytes in front of the binary.
The default build creates a cart file for a 48K rom cart without any
extra features like the pokey audio chip or extra RAM.
In order to make cc65 more user friendly the build will add the a78
header automatically. This allows you to run the binary on emulators
and flash carts on the real console.
<sect>Encryption<p>
In order to boot the game in a mode that supports atari7800 functions
the cart must be encrypted after the linking phase.
There is a program called sign7800 that can be used to sign the cart.
The encryption is not required for running the cart on emulators.
You can also run atari2600 games without encryption.
<sect>Memory layout<p>
cc65 generated programs with the default setup can use RAM from
from &dollar;1800 to &dollar;203f.
The 4k RAM is then mapped to zero page area.
&dollar;2040 to &dollar;20ff is visible as zero page.
After that we have a vero small RAM area that is unused.
&dollar;2100 to &dollar;213f.
Then we mirror a second block from the RAM to become the hardware stack.
This would be from &dollar;2140 to &dollar;21ff.
The C-stack starts at &dollar;2800 and it can grow down to &dollar;2200.
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;2800 -
__STACKSIZE__ and growing downwards.
<tag/Heap/ The C heap is located at &dollar;2200 and grows upwards.
</descrip><p>
<sect>Start-up condition<p>
When powered-up, the Atari 7800 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 7800 specific code may use the
<tt/atari7800.h/ header file.
The following pseudo variables declared in the <tt/atari7800.h/ header
file allow access to the Atari 7800 TIA, MARIA & RIOT chips registers.
<descrip>
<tag><tt/TIA/</tag> The <tt/TIA/ structure allows read/write access
to the Atari 7800 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 7800 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.
<tag><tt/MARIA/</tag> The <tt/MARIA/ structure allows read/write
access to the Atari 7800 MARIA chip registers. See the
<tt/_maria.h/ header file located in the include directory for the
declaration of the structure.
</descrip><p>
<sect>Loadable drivers<p>
There are no drivers for the Atari 7800.
<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/atari7800.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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@ -4763,6 +4763,7 @@ compiler, depending on the target system selected:
<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/__ATARI7800__/ - Target system is <tt/atari7800/
<item><tt/__ATARI__/ - Target system is <tt/atari/ or <tt/atarixl/
<item><tt/__ATARIXL__/ - Target system is <tt/atarixl/
<item><tt/__ATMOS__/ - Target system is <tt/atmos/

3
doc/index.sgml
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@ -124,6 +124,9 @@
<tag><htmlurl url="atari5200.html" name="atari5200.html"></tag>
Topics specific to the Atari 5200 Game Console.
<tag><htmlurl url="atari7800.html" name="atari7800.html"></tag>
Topics specific to the Atari 7800 Game Console.
<tag><htmlurl url="atmos.html" name="atmos.html"></tag>
Topics specific to the Oric Atmos.

1
doc/ld65.sgml
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@ -166,6 +166,7 @@ Here is a description of all of the command-line options:
<item>apple2
<item>apple2enh
<item>atari2600
<item>atari7800
<item>atari
<item>atarixl
<item>atmos

63
include/_maria.h Normal file
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@ -0,0 +1,63 @@
/*****************************************************************************/
/* */
/* _maria.h */
/* */
/* Atari 7800, Maria chip register hardware structures */
/* */
/* */
/* 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: */
/* */
/* 1. 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. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
/*
* MARIA registers
*/
struct __maria {
unsigned char bkgrnd;
unsigned char p0c1;
unsigned char p0c2;
unsigned char p0c3;
unsigned char wsync;
unsigned char p1c1;
unsigned char p1c2;
unsigned char p1c3;
unsigned char mstat;
unsigned char p2c1;
unsigned char p2c2;
unsigned char p2c3;
unsigned char dpph;
unsigned char p3c1;
unsigned char p3c2;
unsigned char p3c3;
unsigned char dppl;
unsigned char p4c1;
unsigned char p4c2;
unsigned char p4c3;
unsigned char chbase;
unsigned char p5c1;
unsigned char p5c2;
unsigned char p5c3;
unsigned char offset;
unsigned char p6c1;
unsigned char p6c2;
unsigned char p6c3;
unsigned char ctrl;
unsigned char p7c1;
unsigned char p7c2;
unsigned char p7c3;
};

65
include/atari7800.h Normal file
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@ -0,0 +1,65 @@
/*****************************************************************************/
/* */
/* Atari VCS 7800 TIA & RIOT registers addresses */
/* */
/* Karri Kaksonen (karri@sipo.fi), 2022 */
/* */
/* */
/*****************************************************************************/
#ifndef _ATARI7800_H
#define _ATARI7800_H
/* Check for errors */
#if !defined(__ATARI7800__)
# error This module may only be used when compiling for the Atari 7800!
#endif
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/* Color defines */
#define COLOR_BLACK 0x00
#define COLOR_GREY 0x01
#define COLOR_LIGHTGREY 0x02
#define COLOR_WHITE 0x03
/* TGI color defines (default palette) */
#define TGI_COLOR_BLACK COLOR_BLACK
#define TGI_COLOR_GREY COLOR_GREY
#define TGI_COLOR_LIGHTGREY COLOR_LIGHTGREY
#define TGI_COLOR_WHITE COLOR_WHITE
/* Masks for joy_read */
#define JOY_RIGHT_MASK 0x80
#define JOY_LEFT_MASK 0x40
#define JOY_DOWN_MASK 0x20
#define JOY_UP_MASK 0x10
#define JOY_BTN_1_MASK 0x01
#define JOY_BTN_2_MASK 0x02
#define JOY_BTN_A_MASK JOY_BTN_1_MASK
#define JOY_BTN_B_MASK JOY_BTN_2_MASK
#define JOY_BTN_A(v) ((v) & JOY_BTN_A_MASK)
#define JOY_BTN_B(v) ((v) & JOY_BTN_B_MASK)
/* No support for dynamically loadable drivers */
#define DYN_DRV 0
#include <_tia.h>
#define TIA (*(struct __tia*)0x0000)
#include <_riot.h>
#define RIOT (*(struct __riot*)0x0280)
#include <_maria.h>
#define MARIA (*(struct __maria*)0x0020)
/* End of atari7800.h */
#endif

2
include/target.h
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@ -43,6 +43,8 @@
# include <atari2600.h>
#elif defined(__ATARI5200__)
# include <atari5200.h>
#elif defined(__ATARI7800__)
# include <atari7800.h>
#elif defined(__ATMOS__)
# include <atmos.h>
#elif defined(__CBM__)

1
libsrc/Makefile
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@ -21,6 +21,7 @@ TARGETS = apple2 \
atarixl \
atari2600 \
atari5200 \
atari7800 \
atmos \
creativision \
$(CBMS) \

71
libsrc/atari7800/crt0.s Normal file
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@ -0,0 +1,71 @@
.export _zonecounter
.export __STARTUP__ : absolute = 1
.export _exit
.import __ROM_START__
.import __RAM3_START__, __RAM3_SIZE__
.import initlib, donelib
.import zerobss, copydata
.import push0, _main
.include "zeropage.inc"
INPTCTRL = $01
OFFSET = $38
CTRL = $3c
.segment "STARTUP"
start:
; Startup sequence recommended by Atari.
; See the 7800 standards document.
sei ; Initialize 6502
cld
lda #$07 ; Lock machine in 7800 mode
sta INPTCTRL
lda #$7f ; DMA off
sta CTRL
ldx #0 ; OFFSET must always be 0
stx OFFSET
stx INPTCTRL ; Make sure joysticks don't freeze
dex ; Stack pointer = $ff
txs
; Set up parameter stack
lda #<(__RAM3_START__ + __RAM3_SIZE__)
sta sp
lda #>(__RAM3_START__ + __RAM3_SIZE__)
sta sp+1
jsr copydata
jsr zerobss
jsr initlib
; Call main program (pass empty command line)
jsr push0 ; argc
jsr push0 ; argv
ldy #4 ; Argument size
jsr _main
_exit:
jsr donelib
jmp start
NMIHandler:
inc _zonecounter
rti
IRQHandler:
rti
.segment "DATA"
_zonecounter:
.byte 0
.segment "ENCRYPTION"
.res 126, $ff ; Reserved for encryption
Lfff8: .byte $ff ; Region verification (always $ff)
Lfff9: .byte $f7 ; Use last 4096 bytes only for encryption
;;;Lfff9: .byte <(((__ROM_START__/4096)<<4) | 7)
.segment "VECTORS"
.word NMIHandler
.word start
.word IRQHandler

5
libsrc/atari7800/ctype.s Normal file
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@ -0,0 +1,5 @@
; Character specification table.
;
; uses the "common" definition
.include "ctype_common.inc"

46
libsrc/atari7800/exehdr.s Normal file
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@ -0,0 +1,46 @@
;
; Karri Kaksonen, 2022
;
; This header contains data for emulators
;
.export __EXEHDR__: absolute = 1
.import __CARTSIZE__
; ------------------------------------------------------------------------
; EXE header
.segment "EXEHDR"
.byte 3 ; version
.byte 'A','T','A','R','I','7','8','0','0',' ',' ',' ',' ',' ',' ',' '
.byte 'G','a','m','e',' ','n','a','m','e',0,0,0,0,0,0,0
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.byte 0,0,>__CARTSIZE__,0 ; Set the cart size in the cfg file
; bit 0 - pokey at 4000
; bit 1 - supergame bank switched
; bit 2 - supergame ram at $4000
; bit 3 - rom at $4000
; bit 4 - bank 6 at $4000
; bit 5 - supergame banked ram
; bit 6 - pokey at $450
; bit 7 - mirror ram at $4000
; bit 8 - activision banking
; bit 9 - absolute banking
; bit 10 - pokey at $440
; bit 11 - ym2151 at $461/462
; bit 12 - souper
; bit 13-15 - Special
; 0 = Normal cart
.byte 0,0 ; 0 = Normal cart
.byte 1 ; 1 = Joystick, 2 = lightgun
.byte 0 ; No joystick 2
.byte 0 ; bit0 = 0:NTSC,1:PAL bit1 = 0:component,1:composite
.byte 0 ; Save data peripheral - 1 byte (version 2)
; 0 = None / unknown (default)
; 1 = High Score Cart (HSC)
; 2 = SaveKey
.byte 0 ; 63 Expansion module
; 0 = No expansion module (default on all currently released games)
; 1 = Expansion module required
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.byte 0,0,0,0,0,0,0,0
.byte 'A','C','T','U','A','L',' ','C','A','R','T',' ','D','A','T','A',' ','S','T','A','R','T','S',' ','H','E','R','E'

4
src/ca65/main.c
View file

@ -212,6 +212,10 @@ static void SetSys (const char* Sys)
NewSymbol ("__ATARI5200__", 1);
break;
case TGT_ATARI7800:
NewSymbol ("__ATARI7800__", 1);
break;
case TGT_ATARI:
NewSymbol ("__ATARI__", 1);
break;

4
src/cc65/main.c
View file

@ -173,6 +173,10 @@ static void SetSys (const char* Sys)
DefineNumericMacro ("__ATARI5200__", 1);
break;
case TGT_ATARI7800:
DefineNumericMacro ("__ATARI7800__", 1);
break;
case TGT_ATARI:
DefineNumericMacro ("__ATARI__", 1);
break;

2
src/common/target.c
View file

@ -147,6 +147,7 @@ static const TargetEntry TargetMap[] = {
{ "atari", TGT_ATARI },
{ "atari2600", TGT_ATARI2600 },
{ "atari5200", TGT_ATARI5200 },
{ "atari7800", TGT_ATARI7800 },
{ "atarixl", TGT_ATARIXL },
{ "atmos", TGT_ATMOS },
{ "bbc", TGT_BBC },
@ -188,6 +189,7 @@ static const TargetProperties PropertyTable[TGT_COUNT] = {
{ "atari", CPU_6502, BINFMT_BINARY, CTAtari },
{ "atari2600", CPU_6502, BINFMT_BINARY, CTNone },
{ "atari5200", CPU_6502, BINFMT_BINARY, CTAtari },
{ "atari7800", CPU_6502, BINFMT_BINARY, CTNone },
{ "atarixl", CPU_6502, BINFMT_BINARY, CTAtari },
{ "vic20", CPU_6502, BINFMT_BINARY, CTPET },
{ "c16", CPU_6502, BINFMT_BINARY, CTPET },

1
src/common/target.h
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@ -57,6 +57,7 @@ typedef enum {
TGT_ATARI,
TGT_ATARI2600,
TGT_ATARI5200,
TGT_ATARI7800,
TGT_ATARIXL,
TGT_VIC20,
TGT_C16,

4
targettest/Makefile
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@ -673,6 +673,9 @@ EXELIST_atari2600 = \
EXELIST_atari5200 = \
minimal
EXELIST_atari7800 = \
minimal
EXELIST_gamate = \
minimal
@ -728,6 +731,7 @@ TARGETS := \
atarixl \
atari2600 \
atari5200 \
atari7800 \
atmos \
bbc \
c128 \