#define DELAY 1000
#define disOFF 0x00
#define ddisnum0 0x3f//dd with dot
#define ddisnum1 0x06
#define ddisnum2 0x5b
#define ddisnum3 0x4f
#define ddisnum4 0x66
#define ddisnum5 0x4d
#define ddisnum6 0x7d
#define ddisnum7 0x07
#define ddisnum8 0x7f
#define ddisnum9 0x6f


#define disnum0 0xbf//d without dot
#define disnum1 0x86
#define disnum2 0xdb
#define disnum3 0xcf
#define disnum4 0xe6
#define disnum5 0xed
#define disnum6 0xfd
#define disnum7 0x87
#define disnum8 0xff
#define disnum9 0xef

volatile char disnum[11] = {disnum0, disnum1, disnum2, disnum3, disnum4, disnum5,
  disnum6, disnum7, disnum8, disnum9};

 volatile char ddisnum[11] = {ddisnum0, ddisnum1, ddisnum2, ddisnum3, ddisnum4, ddisnum5,
  ddisnum6, ddisnum7, ddisnum8, ddisnum9};



void zero_99();
volatile char numtovoltage(volatile long num);

void setup() {
volatile char *dirf,*dirk;
dirf =(volatile char*)0x30;
*dirf = 0xff;
dirk =(volatile char*)0x107;
*dirk = 0xff;
}




void loop() {
  //0 to 99 counter
 zero_99();
}


volatile char numtovoltage(volatile long num){
  switch(num){
    case 1:
    return 0x86;
    break;
    case 2:
    return 0xdb;
    break;
    case 3:
    return 0xcf;
    break;
    case 4:
    return 0xed;
    break;
    case 5:
    return 0xed;
    break;
    case 6:
    return 0xfd;
    break;
    case 7:
    return 0x87;
    break;
    case 8:
    return 0xff;
    break;
    case 9:
    return 0xef;
    break;
    default:
    return 0xbf;
    break;
  }

} 

void zero_99(){
  volatile char *outf,*outk,i,num;
  outf = (volatile char*)0x31;
  outk  =(volatile char*) 0x108;
  for( i =99; i>=0;i--){
     *outf = disnum[i/10];
    *outk = disnum[i%10];
    delay(DELAY);
  }
}