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original-bsd spans 1979..4.4BSD-Lite2 and carries the same if_ether.c string as the ROM. Its pmax (DECstation) if_le.c clears IDON before STRT, Linux does too, but NetBSD's lance.c does not -- and neither does the VT1200 firmware itself (0x3FDDCBE0 writes CSR1/2/3 then 0x7F41 and the live path goes INIT -> poll IDON -> 0x0042 with no IDON clear). Since the firmware works on the real machine, the IDON hypothesis is dead and the descriptor length encoding (section 50) is the remaining explanation.