I'm trying to get some assembly code to run on my 11/23 by entering it in at the ODT, and it seems like I'm having trouble with device I/O addresses. All I've got in the machine right now is the CPU card, an M8044 with 32kW at address 0, and the DLV-11J, set up so that port 3 works with ODT as a console port. I've got a DLV11-J set up so that port 3 is the console, and I can interact with ODT just fine. However, when I try entering something that should read or write to the console, nothing happens. Below is a listing of the assembled code I'm trying - I got the I/O address out of a PDP-11 assembly programming book I got from the library. Most likely the book was written with a UNIBUS -11 in mind, not a QBUS one... is that a problem? 1 000000 LC=. 2 001000 .=LC+1000 3 4 177564 XSR=177564 5 177566 XBUF=177566 6 7 001000 012767 000110 177566' MOV #110,XBUF 8 001006 105767 177564' L1: TSTB XSR 9 001012 100375 BPL L1 10 001014 012767 000064 177566' MOV #64,XBUF 11 001022 105767 177564' L2: TSTB XSR 12 001026 100375 BPL L2 13 001030 012767 000130 177566' MOV #130,XBUF 14 001036 105767 177564' L3: TSTB XSR 15 001042 100375 BPL L3 16 001044 012767 000060 177566' MOV #60,XBUF 17 001052 105767 177564' L4: TSTB XSR 18 001056 100375 BPL L4 19 001060 012767 000122 177566' MOV #122,XBUF 20 001066 105767 177564' L5: TSTB XSR 21 001072 100375 BPL L5 22 001074 000005 RESET 23 001076 000000 HALT -- Pat