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harness/mame/NETWORK_REPORT.md: how the VT1200 firmware drives the LANCE, from ROM disassembly and MAME traces. 50 sections, each claim tied to a bit address, a trace count or a quoted source line. Covers the driver device struct (0x23CBF0), init (0x3F9D4BC0), descriptor/DMA encoding, the live handler (0x3F9D5B40) with per-status-bit dispatch, the RX poll (0x3F9D62B0), ring arming (0x3F9D36C0), TX completion (0x3F9D8AF0) and the single transmit path every protocol uses (0x3F6084E0 -> 0x3F9DC890 -> 0x3F9D4BC0), plus the IP protocol dispatch (0x3F6270F0), ICMP (343-count chain), TCP state tables and live TIME_WAIT, the ARP responder (0x3F6119A0) and the socket 4-tuple demux confirmed by a memory dump. It also records what was withdrawn: five successive explanations for the real-silicon CSR0=0x1BB / TMD1=0x8338 result, and the descriptor-length encoding bug found by comparing Linux 7990.c and NetBSD am7990.c (length must be 0xF000 | -len; MAME masks the difference in get_buf_length). harness/udpstream: the LANCE loopback/takeover payload and the variants used to test the init/kick orderings in MAME (bare TDMD, STOP before INIT, double INIT, long wait with CSR0 sampling, IDON clear, corrected descriptor length). build-lance.sh takes LANCE_SRC/LANCE_OUT so the variants build from one script.