> I intend to put the circuit inside the PC (its not that
> big, just 4 DTMF generating circuits) and it doesn't create a mess
> outside the PC :o).

Have you investigated using the I2C interface built onto the motherboard?
I remember running into some projects that used it for general purpose
use, back when I was doing something with the onboard temperature/fan
monitoring.

Google for I2C and lmsensors.

Cheers,

Bob

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