23 Apr
2005
23 Apr
'05
2:46 p.m.
So after I got my HP 2100 access system working, I noticed that the user
ports (on the 12920 mux) wouldn't work on my Televideo 950. No big deal, I
had a VT100 in the "computer room" and it worked fine. I made a mental note
to investigate the pinouts someday, assuming the VT100 provided a signal the
12920 mux ports were expecting.... something along those lines. Never got
around to it.
Reorganized my "computer room" one day... and hooked everything up to the
Televideo 950 via an ABCD switchbox. Then I brought up the 21MXE access
system, and it suddenly because rather irritating that the TV950 wouldn't
work on the 12920 mux ports, as during the re-org the VT100 was migrated to
a shelf because of the switchbox. Well, now it was a pain so I spent a good
while with a breakout box trying to figure out why an "ENTER" key on the
TV950 would never get a "PLEASE LOG IN" prompt, but on the VT100 it always
did. I spent hours screwing around with custom pinouts, looking at the
control signals and figuring out what when hi/lo and when, etc. I was
confused.
Then I noticed that big fat "LINE FEED" button on the TV950 keyboard. I hit
enter, then linefeed, and voila! PLEASE LOG IN. This immediately struck
home, as I know the Access 12920 mux uses an initial CR/LF to do an
autobaud. This clearly told me that the TV950 was sending a CR, rather than
CRLF when the enter key was pressed. Talk about egg on your face ;) I spent
hours looking in the wrong place - vaguely analogous to forgetting to check
that a device was plugged in. Ha. Ha.
So anyways... many terminals I've worked with support setting the
ENTER/RETURN key to generate a CR, or a CR/LF. I can't find any such setting
on the Televideo 950. Is it there and I'm just missing it?
Jay West
23 Apr
23 Apr
4:22 p.m.
Jay wrote about HP 2000/Access Time Shared BASIC:
Then I noticed that big fat "LINE FEED"
button on the TV950 keyboard. I
hit enter, then linefeed, and voila! PLEASE LOG IN. This immediately
struck home, as I know the Access 12920 mux uses an initial CR/LF to do
an autobaud. This clearly told me that the TV950 was sending a CR, rather
than CRLF when the enter key was pressed. Talk about egg on your face ;) I
spent hours looking in the wrong place - vaguely analogous to forgetting to
check that a device was plugged in. Ha. Ha.
So anyways... many terminals I've worked with support setting the
ENTER/RETURN key to generate a CR, or a CR/LF. I can't find any such
setting on the Televideo 950. Is it there and I'm just missing it?
I don't remember seeing that feature on any terminal, though perhaps
it does exist on some.
Certainly the Teletype ASR-33 that we always used with TSB didn't have
any feature to do that. You just had to hit the linefeed key when you
want a linefeed.
And once you're logged into TSB, I don't think you *want* linefeeds after
each CR.
Eric
7:59 p.m.
Eric wrote...
I don't remember seeing that feature on any
terminal, though perhaps
it does exist on some.
Actually, that feature (setting the enter key to cr OR crlf)
is present on
every terminal I've ever worked with, except about two of them. Most systems
I've worked on in my life required it.
Certainly the Teletype ASR-33 that we always used with
TSB didn't have
any feature to do that. You just had to hit the linefeed key when you
want a linefeed.
Agreed. But Teletypes were current loop, and thus they
wouldn't be hooked up
to the 12920 mux generally would they?
And once you're logged into TSB, I don't think
you *want* linefeeds after
each CR.
You are correct actually.... but here's what confused me.
I'm absolutely positive that the ACT I, IV, and V terminals we had hooked up
to our access system in high school, you simply pressed enter. I'm quite
sure you didn't have to hit linefeed to autobaud. Thus, they were either
generating CRLF, or the system was patched.
Jay West
8:20 p.m.
Jay wrote:
But Teletypes were current loop, and thus they
wouldn't be hooked
up to the 12920 mux generally would they?
Certainly, via either a current loop adapter, or a 103J modem.
AFAIK our school district had *only* Teletypes for user terminals
on the 2000/C' and 2000/Access systems.
Thus, they were either
generating CRLF, or the system was patched.
I remember only hitting one key, but it may have been LF.
Eric
7 p.m.
Then I noticed that big fat "LINE FEED"
button on the TV950 keyboard. I hit
enter, then linefeed, and voila! PLEASE LOG IN. This immediately struck
Worse than that : On a PERQ under PNX, the enter key in fact produces a LF
(which is the convention end-of-line under unix, of course). If you run
the PNX terminal emulator, the enter key sends an LF to the remote system
and the linefeed key sends a CR. Come again????
-tony
7104
days inactive
7105
days old
4 comments
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ard＠p850ug1.demon.co.uk -
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jwest＠classiccmp.org