28 Jan
2016
28 Jan
'16
11:28 p.m.
Hello, all,
I was just gifted with an IBM 3101-12 ASCII terminal that happens to
be missing the fuse and fuse holder. Unlike a lot of 1960s and 1970s
gear, it's not round. It's square. Is this a standard IBM thing from
the 70s/80s? Anyone know where I could get one? It seems to snap in
and probably fell out at some point under its previous owner.
Also, I found only a little info on it from Googling. Later IBM ASCII
terminals emulated ANSI command or Wyse-50 or something. I couldn't
find anything on the 3101. Is it a glass TTY or does it respond to
any cursor positioning, etc. commands?
Thanks for any tips and info. Worst case, I can bodge in a fuse on
the inside, but if I can find a replacement holder, I'd like that
more.
Thanks,
-ethan
29 Jan
29 Jan
2:23 a.m.
On 01/28/2016 08:28 PM, Ethan Dicks wrote:
I was just gifted with an IBM 3101-12 ASCII terminal that happens to
be missing the fuse and fuse holder. Unlike a lot of 1960s and 1970s
gear, it's not round. It's square. Is this a standard IBM thing from
the 70s/80s? Anyone know where I could get one? It seems to snap in
and probably fell out at some point under its previous owner.
Something like this?
http://www.amazon.com/SEACHOICE-PANEL-MOUNT-FUSE-HOLDER/dp/B0006ZCDQ8
--Chuck
9:56 a.m.
On Fri, Jan 29, 2016 at 2:23 AM, Chuck Guzis <cclist at sydex.com> wrote:
On 01/28/2016 08:28 PM, Ethan Dicks wrote:
Not that one. That one has a square outside, yes, but a round body
and a nut. Based on a later message here, the 3101 looks to have
something from the Littlefuse 348 series (square hole, square body,
locking plastic tabs).
But thanks for the suggestion.
-ethan
I was just gifted with an IBM 3101-12 ASCII terminal that happens to
be missing the fuse and fuse holder. Unlike a lot of 1960s and 1970s
gear, it's not round. It's square.
Something like this?
http://www.amazon.com/SEACHOICE-PANEL-MOUNT-FUSE-HOLDER/dp/B0006ZCDQ8 
2:39 a.m.
On Thu, 28 Jan 2016, Ethan Dicks wrote:
I was just gifted with an IBM 3101-12 ASCII terminal
that happens to be
missing the fuse and fuse holder. Unlike a lot of 1960s and 1970s gear,
it's not round. It's square. Is this a standard IBM thing from the
70s/80s? Anyone know where I could get one? It seems to snap in and
probably fell out at some point under its previous owner.
Also, I found only a little info on it from Googling. Later IBM ASCII
terminals emulated ANSI command or Wyse-50 or something. I couldn't
find anything on the 3101. Is it a glass TTY or does it respond to any
cursor positioning, etc. commands?
Thanks for any tips and info. Worst case, I can bodge in a fuse on the
inside, but if I can find a replacement holder, I'd like that more.
There aren't too many US made square panel mount fuse holders. It sounds
like it might be a Littelfuse 348 series.
http://www.littelfuse.com/products/fuse-blocks-fuseholders-and-fuse-accesso…
Littelfuse 348007 (03480007) fuse holder cap, black
Littelfuse 348001 (03480001) fuse holder cap, red
9:57 a.m.
On Fri, Jan 29, 2016 at 2:39 AM, Tothwolf <tothwolf at concentric.net> wrote:
On Thu, 28 Jan 2016, Ethan Dicks wrote:
Indeed. I've seen them, but they aren't ordinary.
I was just gifted with an IBM 3101-12 ASCII
terminal that happens to be
missing the fuse and fuse holder. Unlike a lot of 1960s and 1970s gear,
it's not round. It's square...
There aren't too many US made square panel mount fuse holders. It sounds like it might be a Littelfuse 348 series.
http://www.littelfuse.com/products/fuse-blocks-fuseholders-and-fuse-accesso…
That looks like the thing. Thanks!
-ethan
3:59 p.m.
On Fri, 29 Jan 2016, Ethan Dicks wrote:
I couldn't tell from the grainy b/w photo I found online of the rear of
the terminal if it had a black or red fuse holder cap. They also made them
in a few other colors, but black and red were the most common.
One thing that will differ on the current production 348 series fuse
holder caps vs the vintage ones is they no longer have white paint for the
inset lettering (another victim of RoHS). You can simulate the original
effect with a white-out pen and just scratch off any excess outside the
recessed lettering with a fingernail.
On Fri, Jan 29, 2016 at 2:39 AM, Tothwolf <tothwolf
at concentric.net> wrote:
There was another square faced panel mount fuse holder that used to be
pretty common but I can't remember who made it. I want to say it was
Mountain Switch but I don't think it was them. Unlike the Littelfuse 348
series, it has a round, threaded body with a small hole in the outer edge
of the square frame where you push a small screwdriver to release the
cap's locking tab.
On Thu, 28 Jan 2016, Ethan Dicks wrote:
Indeed. I've seen them, but they aren't ordinary. I was just gifted with an IBM 3101-12 ASCII
terminal that happens to
be missing the fuse and fuse holder. Unlike a lot of 1960s and 1970s
gear, it's not round. It's square...
There aren't too many US made square panel mount fuse holders. It sounds like
it might be a Littelfuse 348 series.
http://www.littelfuse.com/products/fuse-blocks-fuseholders-and-fuse-accesso…
That looks like the thing. Thanks! 
12:56 p.m.
On 01/28/2016 10:28 PM, Ethan Dicks wrote:
Hello, all,
I was just gifted with an IBM 3101-12 ASCII terminal that happens to
be missing the fuse and fuse holder. Unlike a lot of 1960s and 1970s
gear, it's not round. It's square. Is this a standard IBM thing from
the 70s/80s? Anyone know where I could get one? It seems to snap in
and probably fell out at some point under its previous owner.
I'd open up the
case and see if you can find out who made
the whole fuse holder assembly. Lots of outfits made
"fancy" fuse holders that were different entirely for visual
appeal. Or, just browse through the Digi-Key or other
catalogs and try to find a fuse holder that fits the opening
in the case. I'm sure it was NOT a custom IBM part.
Also, I found only a little info on it from Googling.
Later IBM ASCII
terminals emulated ANSI command or Wyse-50 or something. I couldn't
find anything on the 3101. Is it a glass TTY or does it respond to
any cursor positioning, etc. commands?
It definitely has cursor positioning commands. I ran one on
a CP/M system, and added in the cursor and other commands on
a configurable editor and used it for some time.
Jon
1:27 p.m.
On Fri, Jan 29, 2016 at 12:56 PM, Jon Elson <elson at pico-systems.com> wrote:
After my initial post, I did find a mention of positionable cursor and
such in some docs on Bitsavers and Manx.
-ethan
On 01/28/2016 10:28 PM, Ethan Dicks wrote:
It's not a custom IBM part, but it is an uncommon one. As mentioned
earlier today, it appears to be a Littlefuse series 348. I've ordered
a replacement.
I was just gifted with an IBM 3101-12 ASCII
terminal...
I'd open up the case and see if you can find out who made the whole fuse
holder assembly. Lots of outfits made "fancy" fuse holders that were
different entirely for visual appeal. Or, just browse through the Digi-Key
or other catalogs and try to find a fuse holder that fits the opening in the
case. I'm sure it was NOT a custom IBM part. Also, I found
only a little info on it from Googling...
It definitely has cursor positioning commands. I ran one on a CP/M system,
and added in the cursor and other commands on a configurable editor and used
it for some time. 
1:19 p.m.
On 2016-01-29 12:28 AM, Ethan Dicks wrote:
Hello, all,
I was just gifted with an IBM 3101-12 ASCII terminal that happens to
be missing the fuse and fuse holder. Unlike a lot of 1960s and 1970s
gear, it's not round. It's square. Is this a standard IBM thing from
the 70s/80s? Anyone know where I could get one? It seems to snap in
and probably fell out at some point under its previous owner.
Also, I found only a little info on it from Googling. Later IBM ASCII
terminals emulated ANSI command or Wyse-50 or something. I couldn't
find anything on the 3101. Is it a glass TTY or does it respond to
any cursor positioning, etc. commands?
Thanks for any tips and info. Worst case, I can bodge in a fuse on
the inside, but if I can find a replacement holder, I'd like that
more.
Thanks,
-ethan
I did a quick google search for 'ibm 3101' and among the hits was a
manual on archive.org, www.bitsavers.org/pdf/ibm/31xx/ there are two
manuals one of which is the "Terminal Description" that seems to have
plenty of information about the data stream.
The protocol is unusual at least the mod 12 is one of the character mode
terminals supports RS/232 and current loop. The weak point is the
keyboard, the key modules have a leaf spring in them that flexes every
time you press a key and they break. The good news is almost every IBM
keyboard from that time uses exactly the same key module so spares may
not be hard to come by. When I was servicing machine with this type of
keyboard more than 30 years ago, I carried a dozen spare key modules in
my trunk all the time.
Paul.
<www.bitsavers.org/pdf/ibm/31xx/>
1:40 p.m.
On Fri, Jan 29, 2016 at 1:19 PM, Paul Berger <phb.hfx at gmail.com> wrote:
On 2016-01-29 12:28 AM, Ethan Dicks wrote:
I quickly found GA18-2015-3 ("An Introduction to the IBM 3101 Display
Terminal") last
night. The more useful one is GA18-2033-2 ("IBM 3101 Display Terminal
Description").
Figure 2-12 on pages 2-20 through 2-23 have the full command set. It
appears to be
nominally VT52 compatible (ESC-A through ESC-D for cursor movement, ESC-H and
ESC-Y for 'home' and 'set cursor address'...) The 3101 command set
has plenty of
additional commands, and does not implement a few of the full VT52
command set, but
as soon as I get the terminal all cleaned and checked out, I can
probably tell the
host I have a VT52 and get some useful results from it.
I was just gifted with an IBM 3101-12 ASCII
terminal...
I did a quick google search for 'ibm 3101' and among the hits was a manual
on archive.org, www.bitsavers.org/pdf/ibm/31xx/ there are two manuals one
of which is the "Terminal Description" that seems to have plenty of
information about the data stream. The protocol is unusual at least the mod 12 is one of
the character mode
terminals supports RS/232 and current loop.
Yep. Saw that. I might use the current loop (I have a few devices
that support it), but
at first, RS-232 is quite handy.
The weak point is the keyboard,
the key modules have a leaf spring in them that flexes every time you press
a key and they break.
Good to know.
The good news is almost every IBM keyboard from that
time uses exactly the same key module so spares may not be hard to come by.
When I was servicing machine with this type of keyboard more than 30 years
ago, I carried a dozen spare key modules in my trunk all the time.
Very good to know.
Thanks for the tips on the keyboard!
Unfortunately for me, my friend who dropped it off couldn't find the
keyboard ("it's
in the basement...") so I won't be able to make much progress until I get that.
-ethan
5:50 p.m.
On Thu, Jan 28, 2016 at 8:28 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
Hello, all,
Also, I found only a little info on it from Googling. Later IBM ASCII
terminals emulated ANSI command or Wyse-50 or something. I couldn't
find anything on the 3101. Is it a glass TTY or does it respond to
any cursor positioning, etc. commands?
This is the Multics Release 12 Terminal Type File (TTF.ttf) entry:
/***** IBM 3101 ASCII CRT terminal series *****/
terminal_type: IBM3101 like ASCII_CRT;
modes:
default,ll80,pl23,can_type=replace,hndlquit,scroll,fulldpx,echoplex,crecho,lfecho,tabs,^tabecho;
initial_string: ESC L (7) <(10) <SP> ESC 0> CR;
This is the Multics Release 12 C compiler terminfo entry for the 3101:
# @(#)ibm.ti 1.3 (1.10 2/22/83)
ibm|ibm3101|3101|i3101|IBM 3101-10,
cr=^M, cud1=^J, ind=^J, bel=^G, tbc=\EH, hts=\E0, am, cub1=^H,
clear=\EK, lines#24, cols#80, cuf1=\EC, cuu1=\EA, ed=\EJ, el=\EI,
kcud1=\EB, kcub1=\ED, kcuf1=\EC, kcuu1=\EA,
home=\EH, cup=\EY%p1%' '%+%c%p2%' '%+%c, ht=^I,
Attached is ibm3101.ctl.lisp, the 3101 bindings for the LISP interpreter.
-- Charles
30 Jan
30 Jan
12:46 a.m.
On Fri, Jan 29, 2016 at 5:50 PM, Charles Anthony
<charles.unix.pro at gmail.com> wrote:
This is the Multics Release 12 C compiler terminfo
entry for the 3101:
# @(#)ibm.ti 1.3 (1.10 2/22/83)
ibm|ibm3101|3101|i3101|IBM 3101-10,
cr=^M, cud1=^J, ind=^J, bel=^G, tbc=\EH, hts=\E0, am, cub1=^H,
clear=\EK, lines#24, cols#80, cuf1=\EC, cuu1=\EA, ed=\EJ, el=\EI,
kcud1=\EB, kcub1=\ED, kcuf1=\EC, kcuu1=\EA,
home=\EH, cup=\EY%p1%' '%+%c%p2%' '%+%c, ht=^I,
Thanks for that. Based on that as a start, I found this in an old
USENET post...
ftp://ftp.u-aizu.ac.jp/pub/misc/device/terminal/ibm_3161.termcap.txt
I4|ibm|ibm3101|3101|i3101|IBM 3101-10:\
:do=^J:ct=\EH:st=\E0:\
:if=/usr/lib/tabset/ibm3101:\
:am:le=^H:bs:cl=\EK:li#24:co#80:nd=\EC:up=\EA:cd=\EJ:ce=\EI:\
:kd=\EB:kl=\ED:kr=\EC:ku=\EA:ho=\EH:cm=\EY%+\40%+\40:pt:
Attached is ibm3101.ctl.lisp, the 3101 bindings for
the LISP interpreter.
Don't happen to need that, but I should probably mention that this
list strips attachments.
Thanks!
-ethan
18 Feb
18 Feb
9:47 p.m.
On Fri, Jan 29, 2016 at 5:50 PM, Charles Anthony
<charles.unix.pro at gmail.com> wrote:
This is the Multics Release 12 C compiler terminfo
entry for the 3101:
# @(#)ibm.ti 1.3 (1.10 2/22/83)
ibm|ibm3101|3101|i3101|IBM 3101-10,
cr=^M, cud1=^J, ind=^J, bel=^G, tbc=\EH, hts=\E0, am, cub1=^H,
clear=\EK, lines#24, cols#80, cuf1=\EC, cuu1=\EA, ed=\EJ, el=\EI,
kcud1=\EB, kcub1=\ED, kcuf1=\EC, kcuu1=\EA,
home=\EH, cup=\EY%p1%' '%+%c%p2%' '%+%c, ht=^I,
Charles, this was exactly what I needed. I got tired of waiting for
my Littlefuse cap to arrive, so I installed a 3A panel-mount circuit
breaker (recycled from a small UPS) and fired up the terminal tonight.
I fed that terminfo entry into tic and it works like a champ... vi
works, even hack works.
Thanks for the help!
-ethan
P.S. for anyone that runs across this thread later, using this
terminal on a Linux box, my DIP switches are:
10111111 11100000 00110001 10011001
3148
days inactive
3169
days old
12 comments
6 participants
participants (6)
-
cclist＠sydex.com -
charles.unix.pro＠gmail.com -
elson＠pico-systems.com -
ethan.dicks＠gmail.com -
phb.hfx＠gmail.com -
tothwolf＠concentric.net