// LEDs on NumLock, CapsLock and ScrollLock(PB4, PB5, PB6)
DDRB |= (1<<4) | (1<<5) | (1<<6);
- PORTB |= (1<<4) | (1<<5) | (1<<6);
+ PORTB &= ~((1<<4) | (1<<5) | (1<<6));
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;