I tried to add the TU58 emulation (of Will Kranz) to my 11/34, but it does not work. Here is what I have done so far. I added an SLU/RTC (M7856) in the 11/34, and while I worked that out, I added a M7856 page to my website. The intention is to use the added DL11-W for a connection to the TU58 emulation on a (DOS) PC. I configured the DL11-W to CSR 776500 and the vector to 300, for DD:. LTC is disabled, as this is the second DL11-W in the system. The first DL11-W is the system console port. The serial TX and RX channel are set to 9600,N,8,1. When I boot RT11 and enter .SH DEV the output shows that the DD driver is installed and sitting at 776500, with vectors 300 and 304. When the DL11-W is not installed in the system, RT11 reports DD not installed. Next, I made a cable to connect the DL11-W to the serial port of the PC. To check the cable between the PC and the M7856, I started Win98 and used a terminal program. When I enter a character in the terminal app, I can read that character in the RBUF (776502). When I deposit a value in XBUF (776506), I see that character in the receive window of the terminal application. So, the cable is fine. BTW, I use only 3 wires: RxD, TxD, and Gnd ... I boot the PC to DOS, actually Win98 command prompt, not to Win98 itself and then starting a DOS box. Then I run TU58.EXE, for example "TU58 -cTST58.TAP". TU58 seems happy, it takes a second (to format the new "tape") and then reports to be "waiting for a BREAK, or enter Escape to continue". So, I enter ESC. Now the TU58 emulation says that it is waiting for packets ... I have RT11 running on the /34. Then I enter on the PDP-11 console .DIR DD0: Nothing happens, no output appears on the TU58 emulation on the PC. RT11 seems to hang, at least when I enter text on the PDP-11 console, that text is echoed on the VT102, but that's all! Entering control-C prints ^C, but does not return me to the . prompt. BTW, the TU58.INI file has these lines: port 0 baud 9600,N,8,1 That means that I am not using interrupts (on the PC), but polling. I assume that when you enter .DIR DD0: on the PDP-11 console, the TU58 emulation should at least print a "received packets", but nothing is happening. BTW, I also tried with an "irq 4" line in the tu58.ini file, but that gives the same results. I have the feeling that I am overlooking something obvious, or doing something stupid. Should there be some data (receiving packets from the PDP-11) appearing in the TU58 emulation screen? thanks, - Henk, PA8PDP. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.