Earl(y|iest) recording of computer music

I believe, but I'm not positive, that the a small amplifier with a speaker were placed on one of the bits of a given register in the machine, and the music program simply toggled the bit at various rates to create different notes. I know that this method was used on very many older computers, until it was later realized (on machines that had higher clock rates) that similar results could be generated simply by placing an AM radio near the computer, and running different loops of various functions to cause an AM carrier to be created and modulated to make the radio play music. If anyone out there for sure knows how this particular music was created on the Ferranti Mark I, it'd be great to find out. Rick Bensene The Old Calculator Museum http://oldcalculatormuseum.com