Thanks, Dave. The terminal is connected to a Linux box and set up as a serial console. The flow control setting on the Linux serial console *and* the terminal is XON/XOFF. As long as I stay on Linux, everything is fine.
The problem begins when, from the Linux serial console session which is running fine at 38400 baud with no flow control issues whatsoever, I telnet to SimH/VAX OpenVMS. At this point, the flow control problem manifests itself. As long as the telnet session lasts, the problem remains. When I $ LOGOUT and return to the Linux serial console session, the problem disappears. Thanks to Jason's suggestion, I discovered that the VAX is somehow hardwired to expect the telnet session to run at 9600 baud. When I set the Linux serial console and terminal to 9600 baud, 8N1, XON/XOFF, everything works fine, both on Linux *and* when I telnet to the VAX. Nathan On Tue, Oct 19, 2010 at 9:15 PM, Hittner, David T (IS) <[email protected]> wrote: > You have a flow control problem. > > > > Check your terminal and terminal line to see what the flow control is. > > It can be hardware (DTR/DSR) flow control between the real hardware, but > probably also needs to support software (XON/XOFF) between the simulated VAX > and terminal. > > > > Dave > > > > From: [email protected] [mailto:[email protected]] > On Behalf Of Nathan Cutler > Sent: Tuesday, October 19, 2010 11:58 AM > To: [email protected] > Subject: EXTERNAL:[Simh] SimH + real terminal > > > > I just got my hands on a "real" text terminal (the kind with the amber CRT > display). It's a CADO Systems C332 (emulates various VT models). > > I connected the terminal to my Linux box's serial port and started a Linux > serial console on it. I have the terminal working flawlessly with Linux. (I > can use "vi" etc. on the Linux box.) > > However, when I take this a step further, and telnet into the SimH/VAX, a > problem appears. When the VAX sends just a few characters of output, > everything is fine. But when it sends a bunch of characters at once (e.g. > when I do $ DIR, or $ TYPE <long file>), I get the first couple lines OK but > then it just breaks up into nonsense. > > Changing the terminal speed and parity settings makes no difference. (But > these have no meaning for a telnet session anyway, right?) > > Thanks in advance for any help in getting to the bottom of this. > > Please note: telnet sessions to the VAX originating from the Linux console > or X session work just fine. This problem *only* occurs when I (1) log on to > the Linux box from the serial terminal and then (2) telnet to the VAX. > > Any ideas will be greatly appreciated. > > Nathan _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
