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[Aspectrum-devel] trocillos de codigo por aqui, trocillos de codigo por ahi...
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From: Jordi <jb...@ti...> - 2002-10-10 21:00:55
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bueno, abusando descaradamente de la mailing list ;) posteo aqui=
los
cambios mas o menos que tengo en la version de aspectrum de zxdeb=
para que funcionen los 128 y los +2
ah, y algunas cosillas mas ;)
primero de todo, solo una "apreciacion", y es que ExitEmulator=
(en
v_alleg.c) deberia llamarse gExitEmulator, pues depende de la
libreria que usemos
ahora las funciones para emular el 128: de momento usan tamanyo=
de
pagina fijo de 16 kas, pero pasarlo a 8, 4 o 2 o 1 no deberia ser=
dificil (meter un par de defines y ya esta).
tampoco esta implementado eso para escribir en ROM sin tener un=
if
o sea, que tal y como esta aqui funciona, pero se debe pulir:
priemro de todo, en z80.h, dentro de Z80regs:
byte *RAMbank[MAX_RAM_BANKS];
byte *ROMbank[MAX_ROM_BANKS];
byte *page[4];=09=09=09=09// for each page space, a pointer to its=
paged
bank
int pagenum[4];=09=09=09=09// the same as page, to keep the page number=
without comparing pointers
int paging_disabled;=09=09=09// outs at 7ffd & 1ffd have no effect
int shadow_screen;
despues , mi z80initialization queda asi: (basicamente reservo
espacio para las paginas de ram)
************************************
int Z80Initialization (void)
{
FILE *fp;
int i;
/* we get memory and load font, spectrum ROM and
possible snapshots selected by the command line */
printf ("ASpectrum GNU pure C Z80 / Spectrum Emulator V
"VERSION"\n"
=09=09 "(C) 2000-2001 Santiago Romero (NoP/Compiler).\n"
=09=09 "Powered by Allegro 4/3.x WIP -"
=09=09 " http://www.talula.demon.co.uk/allegro/\n"
=09=09 "Distributed under the terms of GNU Public License V2\n\n");
spectrumZ80.RAM =3D (byte *) malloc( 65536 );
if( spectrumZ80.RAM =3D=3D NULL )
{
=09 printf("\n Z80: Error allocating RAM memory,=
exiting...\n\n");
=09 return(0);
}
memset (spectrumZ80.RAM,0,16384*4);
// Get memory for RAM banks
for (i=3D0;i<MAX_RAM_BANKS;i++)
{
=09 spectrumZ80.RAMbank[i]=3D(byte *)malloc(16384);
=09 if (spectrumZ80.RAMbank[i]=3D=3DNULL)
=09 {
=09=09=09printf("\n Z80: Error allocating RAM memory,=
exiting...\n\n");
=09=09=09return(0);
=09 }
=09 memset (spectrumZ80.RAMbank[i],0,16384);
}
// Get memory for ROM banks
for (i=3D0;i<MAX_ROM_BANKS;i++)
{
=09 spectrumZ80.ROMbank[i]=3D(byte *)malloc(16384);
=09 if (spectrumZ80.ROMbank[i]=3D=3DNULL)
=09 {
=09=09=09printf("\n Z80: Error allocating ROM memory,=
exiting...\n\n");
=09=09=09return(0);
=09 }
=09 memset (spectrumZ80.ROMbank[i],0,16384);
}
init_wrapper();
// abrimos el fichero de letras
#ifdef DESTDAT
=09if ((fp=3Dfopen( DESTDAT"/font.fnt", "rb" ) )!=3D NULL)
=09=09printf("using "DESTDAT"/font.fnt\n");
=09else
#endif
=09if ((fp=3Dfopen( "font.fnt", "rb" )) !=3DNULL)
=09=09printf("using ./font.fnt\n");
=09else
=09{
=09=09printf("File font.fnt does not exist...\n");
=09=09return(0);
=09 };
=09fread( tfont, 4096, 1, fp );
=09fclose(fp);
=09i=3D0;
=09// abrimos el fichero de rom
=09if (emuopt.romfile[0]!=3D0)
=09{
=09=09if ((fp=3Dfopen(emuopt.romfile,"rb"))!=3DNULL )
=09=09=09printf("Using ROM file %s\n",emuopt.romfile);
=09=09else
=09=09{
=09=09=09printf("The ROM file does not exists.\n");
=09=09=09return(0);
=09=09}
=09}
#ifdef DESTDAT
=09else if ((fp=3Dfopen( DESTDAT"/spectrum.rom","rb") )!=3DNULL)
=09=09printf("using "DESTDAT"/spectrum.rom\n");
#endif
=09else if ((fp=3Dfopen( "spectrum.rom","rb"))!=3DNULL )
=09=09printf("using spectrum.rom\n");
=09else
=09{
=09=09 printf("File spectrum.rom does not exist ...\n");
=09=09 return(0);
=09};
while( !feof(fp) )
=09 spectrumZ80.RAM[i++]=3Dfgetc(fp);
fclose(fp);
// =BFNecesario? =BFPara que?
//CreateVideoTables();
=09initAYarrays ();
=09Z80MachineInitialization();
=09Z80Reset( &spectrumZ80,
TSTATES_PER_LINE*(TOP_BORDER_LINES+BOTTOM_BORDER_LINES+SCANLINES)=
);
Z80FlagTables();
=09aspectrumInited=3D1;
return 1;
}
************************************
en macros.cpp tengo esto cambiado:
#define Z80ReadMem(A) Z80MemRead (A,regs)
#define Z80WriteMem(a,b,c) Z80MemWrite(a,b,c)
y z80.c tengo estas funciones cambiadas: (el #ifdef es para=
cambiar
entre paginacion(128) y no paginacion (48), para debugar, pero=
con el
metodo de paginacion el modo 48 funciona igualmente (ya digo,=
solo
debug))
************************************
#ifdef INLINE_MEMORY
inline
#endif
byte Z80MemRead( register word address, Z80Regs *regs )
{
u8 *ptr;
int v1,v2;
#ifdef NO_PAGING
=09return regs->RAM[address];
#else
=09ptr=3Dregs->page[(address>>14)&3];
=09v1=3Dptr[address&16383];
//=09v2=3Dregs->RAM[address];
=09return v1;
#endif
}
/*=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D
void Z80MemWrite( register word address, register byte value )
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D*/
#ifdef INLINE_MEMORY
inline
#endif
void Z80MemWrite( register word address, register byte value,=
Z80Regs
*regs )
{
u8 *ptr;
if( address >=3D 16384 )
{
#ifdef NO_PAGING
=09regs->RAM[address]=3Dvalue;
#else
=09ptr=3Dregs->page[(address>>14)&3];
=09ptr[address&16383]=3Dvalue;
//=09regs->RAM[address]=3Dvalue;
#endif
}
}
en z80outport:
=09if (port=3D=3D0x7ffd)
=09{
=09=09port_7ffd(regs,value);
=09}
=09if (port=3D=3D0xfffd)
=09{
=09=09outport_fffd(regs,value);
=09}
=09if (port=3D=3D0xbffd)
=09{
=09=09outport_bffd(regs,value);
=09}
y entonces tengo un machines.cpp del que hago attach, que es el=
que
se encarga de configurar cada una de las futuras maquinas y=
emular el
port 0x7ffd. los ficheros de rom estan hardcoded y todo eso , se=
tiene que hacer mejor para configurar eso
por eso en la proxima entrega, intentare adjuntar el sistema de
configuracion por fichero ;)
venga, ESPERO que este todo (aunque seguro que algo me he=
dejado)
todo este codigo es criticable y modificable, pero tal y como=
esta de
momento funciona perfectamente :)_ (lo mejor para probarlo son=
los
taps, ya que se tendran que modificar las rutinas de sna y z80
bye :)
Kak
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