> On the LSI-11/2, with the machine stopped, 'run' was off, and the
> output on AF1/AH1 was always high (i.e. not asserted).
> I don't have any guesses as to what the behaviour of yours is about.
Hah! Eureka! I had a brainwave, and decided to look at my machine with
the serial console board pulled out!
I then get the exact same behaviour on SRUN as you're seeing - a very brief
spike every so often (about every 25 usec, here).
So I'd be looking pretty hard at your DLV11-E; start by making sure it is
configured correctly.
Past that, you'll need prints; Manx claims there aren't any online, but there
are a set in the jumbo assemblage, ET-LSI-11 (MP00706); the DLV11-E prints are
on pp. 31-37.
All you have to do to get a nice 'scope loop is to power the machine on; the
CPU will dutifully try and read the RCSR, in a fairly tight loop.
Probably worth picking up a spare DLV11 of some type for fault localization
via board-swapping/etc; DLV11-J's can be found on eBait for not a large sum.
Noel
