23 Mar
2016
23 Mar
'16
10:03 a.m.
I'm trying to troubleshoot a TI silent 743/745. When you press the
"rubout" key should it print anything like an underscore? Besides sending the
rubout character, what does the actual print head do? Backup? Print an underscore?
Thanks,
Corey
corey cohen
u??o? ???o?
Mobile: +1 917 747 1408<tel:+1%20917%20747%201408>
23 Mar
23 Mar
10:25 a.m.
On Wednesday (03/23/2016 at 02:03PM +0000), Cohen, Corey A wrote:
I'm trying to troubleshoot a TI silent 743/745.
When you press the "rubout" key should it print anything like an underscore?
Besides sending the rubout character, what does the actual print head do? Backup? Print
an underscore?
I get nothing printed when pressing RUBOUT.
With the unit in off-line mode and in half- or full-duplex, characters
typed are printed. RUBOUT prints nothing.
With the unit in on-line mode and half-duplex, chraracters typed are
printed and RUBOUT prints nothing. In full-duplex, nothing prints unless
the far end echos it back.
Chris
--
Chris Elmquist
10:37 a.m.
On Wednesday (03/23/2016 at 09:25AM -0500), Chris Elmquist wrote:
On Wednesday (03/23/2016 at 02:03PM +0000), Cohen,
Corey A wrote:
I should have elaborated a little on what you might be seeing.
If something does print when you hit RUBOUT and you are on-line and in
half- or full-duplex, it is possible that the far end, whatever host
you are connected to, is echoing something back in response to the RUBOUT.
The terminal sends ASCII 0x7F when you press RUBOUT. This is a non-printing
character locally but the remote system can send back whatever it likes
in response to receiving that 0x7F.
Chris
--
Chris Elmquist
I'm trying to troubleshoot a TI silent
743/745. When you press the "rubout" key should it print anything like an
underscore? Besides sending the rubout character, what does the actual print head do?
Backup? Print an underscore?
I get nothing printed when pressing RUBOUT.
With the unit in off-line mode and in half- or full-duplex, characters
typed are printed. RUBOUT prints nothing.
With the unit in on-line mode and half-duplex, chraracters typed are
printed and RUBOUT prints nothing. In full-duplex, nothing prints unless
the far end echos it back. 
12:57 p.m.
On Wed, Mar 23, 2016 at 10:37 AM, Chris Elmquist <chrise at pobox.com> wrote:
On Wednesday (03/23/2016 at 09:25AM -0500), Chris
Elmquist wrote:
What happens when you're in 20 mA mode? That's what it's for, not
serial
comms unless it's mapped specially. i.e. it's for emulating a teletype.
right?
--
@ BillDeg:
Web: vintagecomputer.net
Twitter: @billdeg <https://twitter.com/billdeg>
Youtube: @billdeg <https://www.youtube.com/user/billdeg>
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On Wednesday (03/23/2016 at 02:03PM +0000),
Cohen, Corey A wrote:
> I'm trying to troubleshoot a TI silent 743/745. When you press the
"rubout" key should it print anything like an underscore? Besides sending
the rubout character, what does the actual print head do? Backup? Print an
underscore?
I get nothing printed when pressing RUBOUT.
With the unit in off-line mode and in half- or full-duplex, characters
typed are printed. RUBOUT prints nothing.
With the unit in on-line mode and half-duplex, chraracters typed are
printed and RUBOUT prints nothing. In full-duplex, nothing prints unless
the far end echos it back.
I should have elaborated a little on what you might be seeing.
If something does print when you hit RUBOUT and you are on-line and in
half- or full-duplex, it is possible that the far end, whatever host
you are connected to, is echoing something back in response to the RUBOUT.
The terminal sends ASCII 0x7F when you press RUBOUT. This is a
non-printing
character locally but the remote system can send back whatever it likes
in response to receiving that 0x7F.
Chris
--
Chris Elmquist
4:51 p.m.
On Wednesday (03/23/2016 at 12:57PM -0400), william degnan wrote:
Both of my units are 745 with EIA interface, internal acoustic coupler
and no 20mA. But checking the manual, I don't see any way that you choose
"20mA mode". It's not a switch or input to the processor that might
change the firmware behavior. So I don't think what gets sent on 20mA
would be different than what gets sent on EIA when you press RUBOUT...
A lot of systems in that era used RUBOUT like a backspace operator.
If the terminal sent RUBOUT, the host/OS would interpret that as a
delete character operation and then echo back a backspace, maybe an X,
then accept the new input character.
https://en.wikipedia.org/wiki/Delete_character
Chris
--
Chris Elmquist
The terminal sends ASCII 0x7F when you press RUBOUT. This is a
non-printing
character locally but the remote system can send back whatever it likes
in response to receiving that 0x7F.
What happens when you're in 20 mA mode? That's what it's for, not
serial
comms unless it's mapped specially. i.e. it's for emulating a teletype.
right?
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4 comments
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billdegnan＠gmail.com -
chrise＠pobox.com -
Corey.Cohen＠ca.com