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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Peter Todd has released source and sample projects for his artwork, including his 3d wireframe cube renderer for the PIC 18f6520 This includes examples of hardware developed with free software tools such as gEDA/gschem/PCB, SDCC, gputils and picp all on Linux. http://petertodd.ca/art/source-code/ |
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