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lance_bcast.c drives the chip entirely on its own -- init block, PADR/LADRF, eight TX and eight RX descriptors, INIT/IDON/STRT, TDMD, completion polling -- and test-bcast.sh runs it in MAME and reports: TXD=6 RXF=5 ET=0x88B5 source MAC 0xC6FC ok=1 PASS The tap capture separates the directions: six 60-byte 0x88b5 broadcasts from 08:00:2b:16:4b:5a (our payload) and 49 from the host. RXF counts host frames (early stop at five) and the recorded source MAC is the host's. Fixes behind it: per-frame TX descriptor (the chip advances its own ring position), cfg-net needed for a tap to exist at all, pkill -x instead of -f, and two bit-vs-byte addressing bugs.