>It works like the NRZ (non return to zero): Logical 0
>is a voltage change and 1 is no change.
>Time for 1 bit is 104 microseconds.
>Can anybody recommend any program for a similar bus
>from which I can start and modify it?

When RCA first brought out the CD4046 PLL chip, they had an application note
that used the CD4046 to recover the clock from the data stream. While this
is a hardware solution, it would give you an idea of what you need to do in
your program. At 104 uS per bit it should be do-able. Had a browse around,
but cannot find an electronic copy on the web. Looks like everyone is
obsoleteing it.

>Also, I have no feeling for the size of such program, so
>would anyone dare to propose which PIC I should start with?

Well I would suggest one of the 18F family, as these have a reasonable
amount of RAM and heaps of Flash. I would have thought an 18F252 or 18F452,
or one of the later versions of these two, as they are considered "mature
products". They also have an internal clock rate multiplier to get extra
speed out of the chip if needed.

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