Bit Banger was Analog modem emulator?
ard at p850ug1.demon.co.uk
Tue Aug 16 17:51:04 CDT 2005
> That reminds me or another little machine from Motorola. They
> called it the Educator II (and was the first computer I ever
> owned). Their cassette interface worked pretty much the same
> way. They toggled a pin on the PIA in software for a simple
> FM encoding at 110 baud. Even the receive side was software.
Many microcomputer cassette interfaces are bit-banged. It works quite
well for that application, because you know when data could be coming
from the cassette (the user has executed a LOAD command or whatever it's
called), so you can put the microprocesosr into a loop looking for
transitions on the input pin.
It works less well for linking to a terminal, because you have know idea
when the user is going to press a key :-)
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