[NTLK] DTR signal on serial slot vs interconnect port

[Bhavishya Goel]

I am trying to communicate with the serial channel 3 on Newton.  I have
referred to the N2 Newton Interconnect Designer's guide (n2-nidg) for the
interconnect port and N2 Internal Serial Slot Designer's guide (n2-issdg)
for the obvious. But I see some differences in signal description for serial
channel 3's DTR line in the two documents. In the n2-nidg, the channel 3 DTR
signal (ModemNotDTR) is labelled as input signal while in n2-issdg, it is
labelled as output signal. Now, from common sense, it should be output. But
is there a catch here? When I checked the interconnect signals on the CRO,
DTR line doesn't show any activity when I try to transmit/receive on serial
channel 3.