This is an old revision of the document!

attinyX5 Family in all their gory details 

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

ATtiny25-ATtiny45-ATtiny85_Datasheet

System Clock Prescaler

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
                  ------
*/