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The unit contains 2 PCBs. This one contains the microprocessor (an 80C49, the internal ROM is not used), EPROM (32K) RAM (8K), a CCITT 300 baud modem and a DAC used to send a digitised speech message
One of the first shots with my new EX-25 extension tube... It's the bottom of a P4 CPU I had sitting around...
Back side, different shades of brown from internal copper planes
Full description and reverse-engineering analysis here: www.eevblog.com/forum/projects/avionics-teardown-looking-...
Back side, labeling
Full description and reverse-engineering analysis here: www.eevblog.com/forum/projects/avionics-teardown-looking-...