Servo library for ATtiny84 programmed by Arduino

Hi all,

I'm struggling with servo library for servos: <Servo.h>, used in ATtiny84 programmed by Arduino.

I did program the ATtiny84 using Arduino Uno without problems and my current wiring looks as follows: testing_platform (in the attachment).

Then I tried the servo library only with Arduino and it also worked without problems.

But if I try to add the servo to the ATtiny84 wiring it is not working at all: testing_platform_servo (in the attachment).

As shown in the wiring, I'm using physical pin: 7, which should be addressed as pin number: 6.
I also tried many of other libraries but either not possible to compile or not working...
I think something is wrong with the servo library working on ATtiny84 because if I only add the library without even wiring the servo, the display starts blinking...

The code is as follows:

#include <Arduino.h>
#include <TM1637Display.h>
#include <Servo.h> // <= Servo
//#include <Servo8Bit.h>
//#include <TinyServo.h>
//#include <PWMServo.h>


// Module connection pins (Digital Pins)
#define CLK 7
#define DIO 8
#define STA 1
#define HRS 2
#define MIN 3
#define REFRESH 1000
#define BUTT_DELAY 200

//Global settings
int gBright = 1;


//Global variables
int gHrs = 0;
int gMin = 0;
int gSec = 0;
int gStart = 0;
int gShowDoubleDot = 0;
long gLastTime = 0;
int gLockButtons = 0;



int pos = 0;



//
Servo servo; // <= Servo
TM1637Display display(CLK, DIO);


//---------------------------------------------------
// Setup
//---------------------------------------------------
void setup()
{
  //Pin seetings
  pinMode(STA, INPUT);
  pinMode(HRS, INPUT);
  pinMode(MIN, INPUT);

  //Switch ON => 00:00
  uint8_t data[] = { 0xff, 0xff, 0xff, 0xff };
  display.setBrightness(gBright);
  display.setSegments(data);
  display.showNumberDec(0, true);

  //Servo
  servo.attach(6); // <= Servo
}


//--------------------------------------------------
// Main Loop
//--------------------------------------------------
void loop()
{

  //Start/Stop
  if (digitalRead(STA) == LOW
      && digitalRead(HRS) == LOW
      && digitalRead(MIN) == HIGH) {

    if (pos == 0) {
      pos = 90;
      
    } else {
      pos = 0;
    }
    
    servo.write(pos); // <= Servo
    display.showNumberDecEx(pos, (0x80 >> 0), true);

    delay(1000);
  }

}

Could you please advice?
Thank you.

@mcnarik,
Maybe too late, but I made the Servo lib work with attiny84 use the correspnding Dx numbers, e.g. physical pin 7 is D4.

In your example, replace

servo.attach(6);   //D6 is connected to pin 9

with 
servo.attach(4);  //D4 is connected to pin 7

No changes to the Servo lib.