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80C32 computer application notes:

DTMF decoder

80C32 computer application notes:
The DTMF (dual-tone multi-frequency) decoder is plugged into the sockets for lC2 and lC3 on the 80C32 extension board. The ICs originally fitted at these positions are moved to the DTMF decoder board. All functions of the extension board are retained after this modification, that is. If the DTMF decoder is not selected (via software).
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