9 Oct
2001
9 Oct
'01
11:23 a.m.
Tony Duell skrev:
> from the terminal. So I tested it with my
DECstation. No response there
> either. So I hooked it up to my Amiga. Typing at the keyboard, there was
> output in NComm, but doing the opposite didn't work at all.
I reat this as you can send from the terminal to the
amiga, but not the
reverse.
I'm sorry, I sent that message off before I'd finished it. But your
interpretation is correct.
I've also tested the cables.
With the nullmodem I'm using right now, I get a whole line of reverse question
marks when the HP does its double-beep to signal that it's entered the self-
test sequence. It works fine when the Amiga's acting as a terminal, both ways.
The VT seems to sense that there is communication going on, though, since
whenever I press return, and the HP generates a new prompt, additional
question marks are printed.
> So we have only one-way communication. What could
be the problem?
Well, most setup faults (like enabling handshake lines)
stop the terminal
from sending, not receiving, so we can discount those.
Most likely it's a hardware problem in the
terminal. My first suspect
would be the RS232 receiver chip, which may have been damaged due to a
spike on the comms line. Open up the terminal and trace the receiver input
from the RS232 connector (pin 3 if it's a DB25 connector) to the chip. It
may be a 1489, it may be something more exotic (I don't have the prints).
Change it and see how you get on.
Will do, as soon as it discharges.
BTW, the VT420 service manual has recently been uploaded to
http://www.vt100.net/, though it's a bunch of multi-page TIFFs, so I'm unsure
what programs will support those.
--
En ligne avec Thor 2.6a.
Schont die Sockel, wenn ihr die Denkm?ler st?rzt. Sie k?nnten noch gebraucht
werden.
--- Stanislaw Jerzy Lec