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== Operation == There is a single serial data line that runs into the light bar. It is demultiplexed via a motorola 145029 and a pair of 4099 addressable latches. The format of serial packets is a sequence of 9 bits: 0: always 0 (used for addressing) 1: always 0 (used for addressing) 2: always 0 (used for addressing) 3: always 0 (used for addressing) 4: when 1, address IC609 (PTT, RADIO, MANUAL, AIR HORN, TAKEDOWN, STROBE, LEFT ALLEY, TAP II) when 0, address IC608 (switched power(?), SECONDARY, PRIMARY, WAIL, YELP, HI-LO, FLOOD, RIGHT ALLEY) 5, 6, 7: address output within IC609/IC608 8: when 1, enable function when 0, disable function The serial bytes are sent in a format documented in the 145026 datasheet. (The trinary/high impedence capabilities of the 145026 are unused.) The 145026 multiplexer has the following hooked up to the timing pins: RTC(13) 10 kohm CTC(12) 470 picofarad RS(11) 22 kohm According to that, the multiplexer should run at a clock speed of 1/(2.3 * 10 kohm * 470 picofarad) = about 92.506938 Khz. The 14029 demultiplexer has the following hooked up to the timing pins: RI(6) = 12 kohm -> CI(7) -> 1500 picofarad -> ground R2/C2(10) = 110 kohm, 3300 picofarad But the datasheet does not give us good timing information for that, but it looks close to the table given in the 145026 datasheet so I believe we're good.
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