ATTiny pinout
                         +-\/-+
                  Reset 1|    |8  VCC
    (pin3) in 0 A3  PB3 2|    |7  PB2 (pin2) out mixed / SCK
    (pin4) in 1 A2  PB4 3|    |6  PB1 (pin1) out 1 / MISO
                    GND 4|    |5  PB0 (pin0) out 0 / MOSI
                         ------

ATtiny25-ATtiny45-ATtiny85_Datasheet

found here

drivers, linux “just works”:, windows is a mess

goal:to control prescaler

in mindfuckHS code original author has this to say about his clock configuration

/*
Timer 1 is used in this case.
   the prescaler is ck1  /2 and the ocr1 is 60
   see   // see http://www.atmel.com/Images/atmel-2586-avr-8-bit-microcontroller-attiny25-attiny45-attiny85_datasheet.pdf
   See table 13-5
   CS13, CS12, CS11, CS10 = [ 0, 0, 1, 0] is prescaler/2
                  ------
*/

and

// the setup function runs once when you press reset or power the board
void setup() {
 
  DDRB = B00000111;  //could use this
 
  // initialize timer1
  noInterrupts();           // disable all interrupts
 
  TCCR1 = 0;                  //stop the timer
  TCNT1 = 0;                  //zero the timer
 
  OCR1A = 200;     //50           //set the compare value
  OCR1C = 200;       //50         //set the compare value  ??? needed
 
  TIMSK = _BV(OCIE1A);        //interrupt on Compare Match A
 
  TCCR1 = _BV(CTC1) | _BV(CS11); // Start timer, ctc mode, prescaler clk/2
 
  interrupts();             // enable all interrupts
}