Converting 9600 Baud to 4800 Baud on ATtiny85

setup () {
   Serial1.begin (9600);
   Serial2.begin (4800);
}

loop () {
   if (Serial1.available())
       Serial2.write(Serial1.read());
}

I have TTL digital signal that is supposed to be sent through a transmitter which operates at 4800 baud. (hopefully this program will work.)

is the ATtiny85 capable of handling this serial conversion ? which pins would the serial connections be connected to? how would i go about uploading the program onto it?

jeff77789: is the ATtiny85 capable of handling this serial conversion ?

Not very well. It can receive or it can transmit but it cannot do both simultaneously. If a byte is being transmitted at the same time a byte arrives, the arriving byte is lost.