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> do you think it would draw to much current to drive an old speaker ?

Ohm's Law again I'm afraid ;-)

If it's an 8 ohm speaker, that's pretty much shorting the output

V = I * R
5 = I * 8
I = 0.625A (625mA)

Any port pin can supply only 25mA, the whole port perhaps 100mA
but that's really pushing the specs. Work backwards to find the minimum
speaker resistance which will (possibly) not munt the pin

R = V / I
R = 5 / 0.025
R = 200 ohms (that is the DC resistance, not Z, the impedance)

If you want to use a speaker you should use a transistor as a current
amplifier or an audio amp IC. A piezo element will be OK as a sound
producer too (see attached). They have been discussed here often

Google for

microcontroller speaker
microcontroller piezo


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