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

spencerCOre note his warning
When using a chip for the first time, or after changing the clock speed or BOD settings, you must do “burn bootloader” to set the fuses, even if you are not using the chip with a bootloader

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
}