"Matt Crawford" <[EMAIL PROTECTED]> writes:
>>A while back someone on cypherpunks posted a program that would let you
>>hear FSK modulation on a normal radio when the program was run, by
>>modulating PCI traffic.
>Shoot, I remember the operators of the CDC 3150 at the local state college
>doing this around 1973 -- they set a radio on top of the console and ran a
>program that fiddled accumulator bits to play tunes.
Steve Dompier did this in 1975 using the first generally-available
microcomputer (an Altair), he demonstrated it by playing "Bicycle for Two"
over the radio. At that time it was the only way to get sound out of it,
although this type of output capability was later a noted (mis-)feature of
the early TRS-80's.
Someone who worked on big iron in the UK once told me that there was so much
RFI coming from one of their test facilities that aircraft had to be prevented
from flying overhead.
Peter.
