/* *****************************************************************
 *    File Name : 87C257.D
 *    Vpp	: 12.75		Vcc:6.25	Dur:100us
 *    Device 	: INTEL 68C257	87C257
 *		  SGS	87C257
 *    Pin num   : 28-pin	(A0..A14	D0..D7)
 *    Size	: 256K (CHMOS EPROM :7FFF)
 *    Last Modify Date : 91. 2. 25
 * ***************************************************************** */
declaration
   dataunit : byte;
   functions
      Program
      Read
      Verify
      Blank_Check
      Data_Compare
      Auto      
   ;
   Manufacturers
      INTEL
      SGS
   ;
   Devices
      D68C257
      D87C257
   ;
   chips = ALE:Vpp, A12, A7, A6, A5, A4, A3, A2, A1, A0, D0, D1, D2, GND,
	   D3, D4, D5, D6, D7, CE, A10, OE, A11, A9, A8, A13, A14, Vcc;
   $v2 = Vpp;
   $v3 = Vcc;
endd

/* -----------------------------------------------------------------------
 * Failf () ---> Fail address setting
 * ----------------------------------------------------------------------- */
int Failf (hwhb, hwlb, lwhb, lwlb, tmp)
int hwhb, hwlb, lwhb, lwlb, tmp;
{
int high, low;

   high = (hwhb << 8) | hwlb;
   low  = (lwhb << 8) | lwlb;

   @Fail high, low, tmp;
}

/* -----------------------------------------------------------------------
 * init () ---> Initial processing
 * ----------------------------------------------------------------------- */
int     init (vol2, vol3)
voltage vol2, vol3;
{
   @Vout 2, vol2;            /* Voltage Source #2 */
   @Vout 3, vol3;            /* Voltage Source #3 */
   @Out GND , @G;            /* Ground output */
   @Delay  10 , @ms;

   @Out D [0..7] , @W;       /* ------------------------ */
   @Out A [0..7] , @W;       /*                          */
   @Out A [8..14], @W;       /*   Initial Direction      */
   @Out CE       , @W;       /*         Of               */
   @Out OE       , @W;       /* ------------------------ */
   @Out ALE	 , @W;
   @Out Vcc	 , @W;
   @Out __GANG__[0..3], @W;

   @Out A [0..7], @L;
   @Out A [8..14],@L;
   @Out Vcc	, @L;
   @Out CE      , @H;       /* Chip enable  is High */
   @Out OE 	, @H;       /* Out  enable  is High */
   @Out ALE	, @H;
   @Out __GANG__[0..3], @H;   

   @Out Vcc     , @O;       /* Vcc Enable */
   @Delay 100	, @us;
}
/* -----------------------------------------------------------------------
 * InitProcess () ---> Initial Buffer | Voltage source
 * ----------------------------------------------------------------------- */
int InitProcess ()
{
   if (FUNCTION != Program) init ( 5.0 , 5.0 );
   else                     init (12.75, 6.25);
}
/* -----------------------------------------------------------------------
 * read () ---> read processing
 * ----------------------------------------------------------------------- */
int read (row)
int	row;
{
int  hwhb, hwlb, lwhb, lwlb;
int  sll, ell, slh, elh;
int  tmp, tmp2;

   lwlb = lwhb = hwhb = hwlb = 0;
   sll = ell = slh = elh = tmp = tmp2 = 0;
   
   @Set B_HADDR, B_LADDR;
   @Out D [0..7], @Z;	/* Data Input  */
   
   if (FUNCTION == Read ) 
   {
      @Display 26, row, "Reading...";
      @CheckSumON;
   }
   else if (FUNCTION == Verify)		@Display 26, row, "Verifying...";
   else if (FUNCTION == Blank_Check)	@Display 26, row, "Blank Checking...";
   else 			        @Display 26, row, "Data Comparing...";

   for ( hwhb=0 /* S_HWHB */ ; hwhb<=0 /* E_HWHB */; hwhb++ )
   {
      @Display 64, 9, hwhb;
      for ( hwlb=0 /* S_HWLB */; hwlb<=0 /* E_HWLB */; hwlb++ )
      {
         @Display 66, 9, hwlb;
         if (hwlb == S_HWLB) slh = S_LWHB;
         else		     slh = 0;
         if (hwlb == E_HWLB) elh = E_LWHB;
         else                elh = 0xFF;	 
         
	 for ( lwhb=slh; lwhb<=elh; lwhb++)
         {
            @Display 68, 9, lwhb;
	    @Out A [8..14], lwhb;   /* Output High word address */

            if (lwhb == S_LWHB) sll = S_LWLB;
            else                sll = 0;
            if (lwhb == E_LWHB) ell = E_LWLB;
            else                ell = 0xFF;

	    for ( lwlb=sll; lwlb<=ell; lwlb++)
	    {
	       if (DEVICE == 0) 
	       {
	       	   @Out OE	, @L;
	       	   if (GANG == 0)	@Out CE	  	   , @L;
	       	   else			@Out __GANG__[GANG], @L;
	       }

	       @Out A [0..7], lwlb;    /* Low  byte address output */
	       @Out ALE	    , @L;
	       
	       if (DEVICE == 0) /*  68C257  */
	       { 
	       	   if (GANG == 0)	@Out CE	    	   , @H;
	       	   else			@Out __GANG__[GANG], @H;
	       	   
	       	   @Out OE	    , @H;
	       }
	       else		/*  87C257  */
	       {
	           if (GANG == 0)	@Out CE	    	   , @L;
	           else			@Out __GANG__[GANG], @L;
	       	   @Out OE	    , @L;
	       }
	       @In  D [0..7], tmp;
	       @Out ALE	    , @H;

	       if (FUNCTION == Read)		@Load tmp;

	       else if (FUNCTION == Blank_Check)
	       {
		  if (tmp != 0xFF) Failf (hwhb, hwlb, lwhb, lwlb, tmp);
	       }
	       else if (FUNCTION == Verify)
	       {
                  @Store tmp2;
                  if (tmp != tmp2) Failf (hwhb, hwlb, lwhb, lwlb, tmp);
               }
               else if (FUNCTION == Data_Compare)	
               {
               	    @Store	tmp2;
               	    @Compare	tmp, tmp2;
               }
	       @Inc SPLIT;
            }
	 }
      }
   }
   if 	   (FUNCTION == Read)		@Display 26, row, "Read OK!   ";
   else if (FUNCTION == Verify)		@Display 26, row, "Verification OK!";
   else if (FUNCTION == Blank_Check)	@Display 26, row, "Blank Check OK!  ";
   else 			        @Display 26, row, "Data Comparison OK!";   
}
/* -----------------------------------------------------------------------
 * program () ---> Control main
 * ----------------------------------------------------------------------- */
int program (row, kind)
int	row, kind;
{
int  hwhb, hwlb, lwhb, lwlb;
int  sll, ell, slh, elh;
int  tmp , tmp2, failcnt;

   lwhb = lwlb = hwhb = hwlb = failcnt = 0;
   sll = ell =slh = elh = tmp =tmp2 = 0;

   @Set B_HADDR, B_LADDR;   
   @Inc	__B_START__;
   @Display 26, row, "Programming...";   
   
   @Out Vpp,	@O;

   for ( hwhb=0 /* S_HWHB */; hwhb<=0 /* E_HWHB */; hwhb++ )
   {
	@Display 64, 9, hwhb;
	for ( hwlb=0 /* S_HWLB */; hwlb<=0 /* E_HWLB */; hwlb++ )
	{
	    @Display 66, 9, hwlb;
            if (hwlb == S_HWLB) slh = S_LWHB;
            else		     slh = 0;
            if (hwlb == E_HWLB) elh = E_LWHB;
            else                elh = 0xFF;	 
            
	    for ( lwhb=slh; lwhb<=elh; lwhb++)
            {
               @Display 68, 9, lwhb;
	       @Out A [8..14], lwhb;   /* Output High word address */

               if (lwhb == S_LWHB) sll = S_LWLB;
               else                sll = 0;
               if (lwhb == E_LWHB) ell = E_LWLB;
               else                ell = 0xFF;
               
	       for ( lwlb=sll; lwlb<=ell; lwlb++)
	       {
		  @Store tmp;
 		                                 	
	          @Out A [0..7], lwlb;
		  @Out D [0..7], tmp;

		  if (GANG == 0)	@Out CE		   , @L;
		  else			@Out __GANG__[GANG], @L;
		  
		  @Delay 100	, @us;
		  
		  if (GANG == 0)	@Out CE		   , @H;
		  else			@Out __GANG__[GANG], @H;
		  
		  @Out D [0..7], @Z;
		  @Out OE      , @L;

		  @In  D [0..7], tmp2;

		  @Out OE      , @H;
		  @Out D [0..7], @W;

		  if (tmp != tmp2)
                  {
		     if (failcnt > 25) Failf (hwhb, hwlb, lwhb, lwlb, tmp2);
		     else
		     {
			++ failcnt;
			lwlb--;
		     }
                  }
                  else
                  {
                     failcnt = 0;
                     @Inc SPLIT;
                  }
               }
            }
	}
   }	
   @Out	Vpp	, @F;
   @Display  26, row, "Program OK!  ";
   FUNCTION = Verify;
   if (kind == 0)	row = 7;
   else			row = 8;
   @Vout 2, 5.0;
   @Vout 3, 5.0;
   read (row);		/*  Verify  */
}
/* -----------------------------------------------------------------------
 * main () ---> Control main
 * ----------------------------------------------------------------------- */
int main ()
{
   InitProcess();

   if ( FUNCTION == Auto )
   {
	FUNCTION = Blank_Check;
	read (6);

	FUNCTION = Program;
	InitProcess ();
	program(7, 1);
   }
   else if ( FUNCTION == Program ) program(6, 0);
   else if ( FUNCTION == Read )
   {
   	if 	(GANG >= 1 && __B_START__ == 0);
   	else if (GANG == 3 && __B_START__ == 1);
   	else read (6);
   } 
   else 			   read (6);
}
/* ---------------------------- End of program --------------------------- */