19 Oct
2020
19 Oct
'20
3:10 p.m.
From: Chris Zach
still nothing coming out of the serial port. Figured I
would document
the settings and see if anyone with an 11/24 can cross-check my settings.
Time to stop trying random things and drop the (metaphorical) Big Hammer.
Look at the bus, and see if it's trying to talk to the console (i.e. ODT is
running).
Alas, I looked at the -11/24 Tech Manual - latest rev here:
http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/dload/EK-11024-TM-003.pdf
and it sez (pg. 4-25):
"Internal addresses; i.e. serial line unit registers .. There is no external
bus cycle performed for an internal address."
So you can't look on the UNIBUS. At least we have a set of prints for it:
http://bitsavers.org/pdf/dec/pdp11/1124/MP01018_1124schem_Aug80.pdf
CPU prints start on pg. 145; the TM will tell you what signals to look for.
Noel