aspectrum-devel Mailing List for ASpectrum Spectrum Emulator (Page 3)

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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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aspectrum-devel Mailing List for ASpectrum Spectrum Emulator (Page 3)

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