27 Nov
1998
27 Nov
'98
5:53 p.m.
< be able to send/receive. This also means both computers must be in
< perfect sync so they catch the rising/falling edges of the signal.
< IHMO, it's not a very good idea!
Simple encode a one as one ful cycle of 4800hz and a zero as a half cycle
of 2400hz (FM encoding). Recieving that is simple wait for the bit to
change and then wait to see if there is a change at one half (or window
from 1/3 to 2/3) and then decide if that was a one or
zero. since there
is a once per bit change (minimum) you can sync the machines by
sending
a header of say 16 zeros.
The casette tape soctware does exactly that but at a slower rate as the
recorders are not so good as direct wires.
Allison