forked from arti/vt1200
arti
ed185279ca
Loading the COFF over rdebug pokes thousands of words one at a time, so how
long the payload takes to appear varies by tens of seconds -- a fixed sleep is
either wasteful or too short. The payload now broadcasts three frames the
moment its ring is armed: ethertype 0x88B6, 'K' 'S', opcode 0xFF, magic
"LANC". `vtcmd.py wait` listens for it; measured at 8.7 s in MAME.
Two details found by measurement:
* The announce must use TX slot 0, because the chip transmits only from its
ring position -- arming slot 7 while the position is 0 never sends
anything (the first attempt did exactly that and was silently lost).
* After the announce the reply cursor advances to slot 1 to match the chip's
new position, so replies do not collide with the announce descriptor.
txfull then stays 0 across consecutive replies; before this it read 1.
test-osboot.sh ties the hand-back together with no sleep: listen, load, wait
for the announce, stats, osboot, wait for :771. Report sections 73.3/73.4.