Mark Godwin has updated the antenna control software to hopefully remove the “bounce” we are observing when attempting to detect the ONSOURCE state. While the symptoms appear to have changed slightly, the bounce is still present:

2010.180.03:43:44.26;source=slkdjf,030000.0,-600000.0,1950.0
2010.180.03:43:44.27#antcn#Commanding to a new source
2010.180.03:43:44.49#antcn#Status done.
2010.180.03:43:45.54#antcn#Drives on.
2010.180.03:43:45.55#antcn#Antenna Stopped.
2010.180.03:43:45.55#antcn#Converted 0.791662:45.358902, -1.042958:-59.757115 → 453589, -597569
2010.180.03:43:46.07#flagr#flagr/antenna,new-source
2010.180.03:43:59.85#antcn#Source Aquired.
2010.180.03:43:59.85#flagr#flagr/antenna,acquired
2010.180.03:44:02.10#antcn#Slew in progress.
2010.180.03:44:02.10#flagr#flagr/antenna,off-source
2010.180.03:44:04.34#antcn#Source Aquired.
2010.180.03:44:04.34#flagr#flagr/antenna,re-acquired
2010.180.03:44:06.58#antcn#Slew in progress.
2010.180.03:44:06.58#flagr#flagr/antenna,off-source
2010.180.03:44:17.88#antcn#Source Aquired.
2010.180.03:44:17.88#flagr#flagr/antenna,re-acquired
2010.180.03:44:22.37#antcn#Slew in progress.
.
.
.
etc

Booting the DBBC with the 8GB CF Linux.
Attempts to do this continued this afternoon. After some fiddling the actual error message was obtained: “ata2.00 exception emask…“
Studies will continue.