The SPKR line is driven by TIOCB1/TCLCKC, pin 4 of the HD6472246 (the H8S main processor). UB is the unregulated battery supply so there should be a 2.4 volt swing before the 18 Ohm R23.
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<A HREF="http://techref.massmind.org/techref/cybiko/speaker.htm"> Cybiko Speaker</A>
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