[pups] Problems booting PDP11/40 using vtserver

Johnny Billquist bqt at update.uu.se
Tue Jan 29 08:53:42 AEST 2002

On Sat, 26 Jan 2002, Michael Werner wrote:

> Hi there,
> I have my PDP11/40 connected to a MicroVAX 2 (running NetBSD/vax
> 1.5.2) via serial line and want to boot a 2.9BSD or 2.11BSD using the
> vtserver software.
> When I toggle in vtserver's boot code, the first file is being loaded
> correctly by the PDP. Then, following the instructions in vtserver
> documentation, the serial line should be used as a serial console - and
> some text should appear! And this is the problem: I don't get any output.
> When manually sending characters from the PDP, there is no problem.

Okay. If it isn't a problem when you do it by hand it shouldn't be a
problem in the program either.

> I've set the serial line characteristics to:
> Speed 2400, Character Size 8, Modem Control enabled, and RTS/CTS flow
> control disabled. (I've changed these characteristics in many ways with
> stty, but still no success...)
> Using a break-out-box, I switched RTS/CTS and DTR/CTS flow control on and
> off, forced the CTS line to be on, etc., but it still didn't work.
> After successfully loading the bootloader via vtserver, the PDP's CPU goes
> into an endless loop.
> So, my question: Does anybody know what's going wrong here?

Got the source code for that bootstrap?


Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt at update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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