PS/2 keyboard for MSX PC timing Trouble FIX

blink.cpp

void blink()
{
    if (PIND==8) { // If your machine has more one line change this to 9
      noInterrupts();
      delayMicroseconds(1);
      if (PIND==8) {  
        PORTC = keyboard.MSX_KB_Matrix(0);
      }else{
        PORTC = keyboard.MSX_KB_Matrix(PIND+1); // 8 bits of the Matrix on PORT C (PIN
      }
      interrupts();
    } else {
      noInterrupts(); // Deactivate interruptions to avoid keyboard matrix corruption
      PORTC = keyboard.MSX_KB_Matrix(PIND+1); // 8 bits of the Matrix on PORT C (PIN
      interrupts();   // Activate interruptions
    }  
}

PIND==8の処理で、割込み禁止後 もう一度PIND==8かとif文できくと違う場合があるという....
タイミングトラブルです