> --- Fred Quimby <c9r@xxxxxxxxxxx> wrote:
>
>>As for a cable, I would think that you'd just need
>>to connect two wires:
Glenn Saunders wrote:
> Wouldn't something like these would be necessary for
> the TTL level conversion:
>
> http://www.awce.com/rs1.htm
> http://www.piclist.com/techref/io/serial/RCL1.htm
Correct. RS232 serial ports (the standard variety) signal with +/-12V
logic(I think it is inverted so -12V corresponds to a 1)
+/-10V has been more common for quite a while, and almost all RS232
chips inputs can take anything from +/-5V to +/-15V. Common RS232 chips
use a charge pump to generate the +/-10V from the system voltage,
typically 5 or 3.3V.
Thus, TTL logic with +5 to 0V signaling will not work.(reliabily. You
may get it to work a little, but not reliably.)
Either of those products would be exactly what you need. Just connect
the tty level signal to the I/Os of the joystick port, and the power and
grounds togather to power the chip.
Mark
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