The Connection window lets you choose how PDP11GUI should connect to a target machine. After the connection is established, you should see the target machine’s console prompt in the Terminal window.



At the moment, you can connect to one of these target machines:

  • A primitive simulation of a 11/44 console. It is built right into PDP1GUI. Only main memory and Examine/Deposit commands are implemented. This can be used as selftest for PDP11GUI, or to get familiar with the tool windows.
    A baudrate can be set to simulate the timing between PDP11GUI and the target machine.
  • Primitive simulations of ODT machines with different address widths.
  • A PDP-11/44 attached directly to one of the COM-ports of the PC on wich PDP11GUI is running. This is the most straight-forward configuration. You need an null-modem cable.
  • A PDP-11/44 attached to “serial-to-telnet-server”. The serial line of the PDP-11/44 goes into the COM port of a networked PC, who is running a Telnet server and routes the COM port to the TCP/IP world. The PC PDP11GUI is running on connects to the telnet server. “Serial to telnet-server” converters are also available as dedicated hardware, mostly for industrial applications.
    I use this configuration, because my PDP-11/44 runs in the basement side-by-side with my fileserver. My office is on the 2nd floor, so a serial connection is difficult, but a network connection already exists.
  • 16-Bit ODT machines like11/03, over serial connection or over telnet.
  • 18-Bit ODT machines like11/23, over serial connection or over telnet.
  • 22-Bit ODT machines like11/53, over serial connection or over telnet.
  • SimH over telnet.
    You need a special version of SimH (see here). SimH has a command window which implements “Deposit/Examine/Run/Stop/Single Step” in a manner somewhat similar to the PDP-11/44. To connect PDP11GUI to the SimH command I/O window in telnet mode, do this:
    1. in SimH, issue “set stdio telnet=
    SimH is waiting 10 seconds for an incoming connection.
    2. in PDP11GUI, call the connection settings window (see above).
    Then you can control SimH over the terminal window
    3. to release the connection to SimH, type in the terminalw indow:
    “set stdio notelnet”
    After this, SimH accepts command input over its own console window again.

Needless to say: Use the highest possible baudrate!

The current connection settings are shown in the Terminal window’s title.