24 Mar
2013
24 Mar
'13
3:38 a.m.
I've been working on an IBM Selectric typewriter which I bought earlier
in the year. It is the I/O Selectric type 735 which differs from a
normal Selectric in having the solenoids and switches on it to allow it
to be used as a printer and keyboard.
When I got it the motor wouldn't run, and the mechanism was jammed. The
motor problem was its thermal trip, which is meant to be the resettable
type, so I replaced that. I gave the whole thing a clean with
degreaser, which freed up the mechanicals, then oiled and greased it.
It then worked happily as a typewriter.
I have made a small interface, based on an Arduino Mega 2560, which
provides a serial port. Currently this only supports printing, but will
be extended to include the keyboard. It uses almost all the digital I/O
on the Mega (15 solenoids, 27 contacts.)
There are still some adjustments to be done, and I am awaiting a set of
Bristol Wrenches (Keys) so I can safely do these. I have tried using
Torx and Allen keys, and while they can be made to 'fit', it doesn't
seem like a good idea.
There are some pictures and videos of the typewriter here:
http://www.flickr.com/photos/ljw/sets/72157632841492802/
You can get the Arduino interface code here:
https://github.com/ibm2030/IOSelectric
I haven't yet documented the hardware I used for the solenoid drivers,
but if anyone is interested I can put some notes together (basically:
Arduino output to 2N7000 FET buffer to ITS4140N +48V high-side driver on
the output side, and a simple 250R pullup to +5V on the input side.)
Manuals here:
http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/typewriter/selectric/
(or other Bitsavers mirrors)
Info on the Mega2560 here: http://arduino.cc/en/Main/arduinoBoardMega2560
--
Lawrence Wilkinsonlawrence at ljw.me.uk
The IBM 360/30 pagehttp://www.ljw.me.uk/ibm360
24 Mar
24 Mar
5:40 a.m.
On 3/24/13 4:38 AM, Lawrence Wilkinson wrote:
I've been working on an IBM Selectric typewriter
which I bought earlier
in the year. It is the I/O Selectric type 735 which differs from a
normal Selectric in having the solenoids and switches on it to allow it
to be used as a printer and keyboard.
When I got it the motor wouldn't run, and the mechanism was jammed. The
motor problem was its thermal trip, which is meant to be the resettable
type, so I replaced that. I gave the whole thing a clean with
degreaser, which freed up the mechanicals, then oiled and greased it. It
then worked happily as a typewriter.
I have made a small interface, based on an Arduino Mega 2560, which
provides a serial port. Currently this only supports printing, but will
be extended to include the keyboard. It uses almost all the digital I/O
on the Mega (15 solenoids, 27 contacts.)
There are still some adjustments to be done, and I am awaiting a set of
Bristol Wrenches (Keys) so I can safely do these. I have tried using
Torx and Allen keys, and while they can be made to 'fit', it doesn't
seem like a good idea.
There are some pictures and videos of the typewriter here:
http://www.flickr.com/photos/ljw/sets/72157632841492802/
You can get the Arduino interface code here:
https://github.com/ibm2030/IOSelectric
I haven't yet documented the hardware I used for the solenoid drivers,
but if anyone is interested I can put some notes together (basically:
Arduino output to 2N7000 FET buffer to ITS4140N +48V high-side driver on
the output side, and a simple 250R pullup to +5V on the input side.)
Manuals here:
http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/typewriter/selectric/
(or other Bitsavers mirrors)
Info on the Mega2560 here: http://arduino.cc/en/Main/arduinoBoardMega2560
Wow! What a beast. It's no wonder they commanded such a high price back
in the day. Matter of fact, I think a good portion of the selectrics
were leased if I remember correctly. Very nice looking machine, even
without the cover. :)
--
Dave Land
Land Computer Service
Check out my site at http://www.landcomp.net
10:35 a.m.
On Mar 24, 2013, at 3:38 AM, Lawrence Wilkinson <lawrence at ljw.me.uk> wrote:
I've been working on an IBM Selectric typewriter
which I bought earlier in the year. It is the I/O Selectric type 735 which differs from a
normal Selectric in having the solenoids and switches on it to allow it to be used as a
printer and keyboard.
When I got it the motor wouldn't run, and the mechanism was jammed. The motor problem
was its thermal trip, which is meant to be the resettable type, so I replaced that. I
gave the whole thing a clean with degreaser, which freed up the mechanicals, then oiled
and greased it. It then worked happily as a typewriter.
I have made a small interface, based on an Arduino Mega 2560, which provides a serial
port. Currently this only supports printing, but will be extended to include the
keyboard. It uses almost all the digital I/O on the Mega (15 solenoids, 27 contacts.)
There are still some adjustments to be done, and I am awaiting a set of Bristol Wrenches
(Keys) so I can safely do these. I have tried using Torx and Allen keys, and while they
can be made to 'fit', it doesn't seem like a good idea.
There are some pictures and videos of the typewriter here:
http://www.flickr.com/photos/ljw/sets/72157632841492802/
You can get the Arduino interface code here: https://github.com/ibm2030/IOSelectric
I haven't yet documented the hardware I used for the solenoid drivers, but if anyone
is interested I can put some notes together (basically: Arduino output to 2N7000 FET
buffer to ITS4140N +48V high-side driver on the output side, and a simple 250R pullup to
+5V on the input side.)
Manuals here: http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/typewriter/selectric/
(or other Bitsavers mirrors)
Info on the Mega2560 here: http://arduino.cc/en/Main/arduinoBoardMega2560
Very cool!
When I was in school (35 years ago) I had an IBM 1052 terminal that I interfaced to an
8080. The issue with the 1052 was that the relays were all 48v so finding drivers was
interesting. ;-)
It took me a bit of fiddling with the timing to get it to print properly (at 134.5 baud).
It sure beat the ASR/KSR-33s that most other folks were using for their terminals just for
the "cool" factor!
TTFN - Guy
12:27 p.m.
On 24/03/13 17:35, Guy Sotomayor wrote:
When I was in school (35 years ago) I had an IBM 1052
terminal that I
interfaced to an 8080. The issue with the 1052 was that the relays
were all 48v so finding drivers was interesting. ;-) It took me a bit
of fiddling with the timing to get it to print properly (at 134.5
baud). It sure beat the ASR/KSR-33s that most other folks were using
for their terminals just for the "cool" factor! TTFN - Guy
The mechanicals of the 735 and 1052 are basically the same. The 1052
has pin feed, extra switches and things to suit use as a computer
console, whereas the 73x are designed for word processing use. The one
I got came from such a WP system, though I've no idea where the rest of
that system got to. It was a "Kode" system (Calne, Wiltshire, UK) which
used paper tape.
--
Lawrence Wilkinson lawrence at ljw.me.uk
Ph 07841-048948 http://www.ljw.me.uk
3:15 p.m.
On Mar 24, 2013, at 12:27 PM, Lawrence Wilkinson <lawrence at ljw.me.uk> wrote:
On 24/03/13 17:35, Guy Sotomayor wrote:
Is that really true? The 1052 was *very* heavy duty. I think they were similar in the
way that the ASR33 and ASR35 were similar.
TTFN - Guy
When I was in school (35 years ago) I had an IBM
1052 terminal that I interfaced to an 8080. The issue with the 1052 was that the relays
were all 48v so finding drivers was interesting. ;-) It took me a bit of fiddling with the
timing to get it to print properly (at 134.5 baud). It sure beat the ASR/KSR-33s that most
other folks were using for their terminals just for the "cool" factor! TTFN -
Guy
The mechanicals of the 735 and 1052 are basically the same. The 1052 has pin feed, extra
switches and things to suit use as a computer console, whereas the 73x are designed for
word processing use. The one I got came from such a WP system, though I've no idea
where the rest of that system got to. It was a "Kode" system (Calne, Wiltshire,
UK) which used paper tape.
25 Mar
25 Mar
2:38 p.m.
On 24/03/13 22:15, Guy Sotomayor wrote:
On Mar 24, 2013, at 12:27 PM, Lawrence Wilkinson
<lawrence at ljw.me.uk> wrote:
AFAIK all the I/O Selectrics were much the same. The maintenance
intervals were dictated by how much they were used (one, two, three
shifts). I'm not 100% sure the desktop typewriters were designed for
the same duty, but I wouldn't be surprised if they were.
--
Lawrence Wilkinson lawrence at ljw.me.uk
Ph 07841-048948 http://www.ljw.me.uk
On 24/03/13 17:35, Guy Sotomayor wrote:
Is that really true? The 1052 was
*very* heavy duty. I think they were similar in the way that the ASR33 and ASR35 were
similar.
TTFN - Guy
When I was in school (35 years ago) I had an IBM
1052 terminal that I interfaced to an 8080. The issue with the 1052 was that the relays
were all 48v so finding drivers was interesting. ;-) It took me a bit of fiddling with the
timing to get it to print properly (at 134.5 baud). It sure beat the ASR/KSR-33s that most
other folks were using for their terminals just for the "cool" factor! TTFN -
Guy
The mechanicals of the 735 and 1052 are basically the same. The 1052 has pin
feed, extra switches and things to suit use as a computer console, whereas the 73x are
designed for word processing use. The one I got came from such a WP system, though
I've no idea where the rest of that system got to. It was a "Kode" system
(Calne, Wiltshire, UK) which used paper tape.
2:50 p.m.
On Mar 25, 2013, at 2:38 PM, Lawrence Wilkinson <lawrence at ljw.me.uk> wrote:
On 24/03/13 22:15, Guy Sotomayor wrote:
I can't remember the internals at all at this point but I do remember that the
castings for the frame were *heavy* on the 1052. Nothing like any of the other Selectric
frames I saw (like the 2741) and certainly nothing like the Selectric typewriters that I
had (or saw). The 1052 was build like a tank.
As I said, the pick relays on the 1052 were all 48v so given your description, the
electrical portions are different than what's on the 735.
TTFN - Guy
On Mar 24, 2013, at 12:27 PM, Lawrence Wilkinson
<lawrence at ljw.me.uk> wrote:
AFAIK all the I/O Selectrics were much the same. The maintenance intervals were
dictated by how much they were used (one, two, three shifts). I'm not 100% sure the
desktop typewriters were designed for the same duty, but I wouldn't be surprised if
they were. On 24/03/13 17:35, Guy Sotomayor wrote:
Is that really true? The 1052 was
*very* heavy duty. I think they were similar in the way that the ASR33 and ASR35 were
similar.
TTFN - Guy
When I was in school (35 years ago) I had an IBM
1052 terminal that I interfaced to an 8080. The issue with the 1052 was that the relays
were all 48v so finding drivers was interesting. ;-) It took me a bit of fiddling with the
timing to get it to print properly (at 134.5 baud). It sure beat the ASR/KSR-33s that most
other folks were using for their terminals just for the "cool" factor! TTFN -
Guy
The mechanicals of the 735 and 1052 are basically the same. The 1052 has pin
feed, extra switches and things to suit use as a computer console, whereas the 73x are
designed for word processing use. The one I got came from such a WP system, though
I've no idea where the rest of that system got to. It was a "Kode" system
(Calne, Wiltshire, UK) which used paper tape.
24 Mar
24 Mar
3:21 p.m.
On Mar 24, 2013, at 12:27 PM, Lawrence Wilkinson <lawrence at ljw.me.uk> wrote:
On 24/03/13 17:35, Guy Sotomayor wrote:
The other thing that was different between them was the keyboard. There was no
possibility of a direct linkage between the keyboard and the printer unit. The keyboard
required a "reset" signal to unlock it after each key was pressed (possibly with
the exception of shift...it's been too long...I can't remember that aspect of it
anymore).
TTFN - Guy
When I was in school (35 years ago) I had an IBM
1052 terminal that I interfaced to an 8080. The issue with the 1052 was that the relays
were all 48v so finding drivers was interesting. ;-) It took me a bit of fiddling with the
timing to get it to print properly (at 134.5 baud). It sure beat the ASR/KSR-33s that most
other folks were using for their terminals just for the "cool" factor! TTFN -
Guy
The mechanicals of the 735 and 1052 are basically the same. The 1052 has pin feed, extra
switches and things to suit use as a computer console, whereas the 73x are designed for
word processing use. The one I got came from such a WP system, though I've no idea
where the rest of that system got to. It was a "Kode" system (Calne, Wiltshire,
UK) which used paper tape. 
10 May
10 May
10:25 p.m.
New subject: HP 1820-1584 IC replacement?
I have an HP 9872 plotter that just died. According to the internal self
test (very nice!)
one of the bib (MOS to TTL) drivers has failed. A scope shows one data
line not moving also.
The HP part number is 1820-1584. I can't find a cross reference on the
web for it. Does anyone
know if there's an equivalent chip? It's a 20 pin dip.
+7 volts on pin 20, gnd on 10
MOS side is pins 1-8, TTL side is 12-19
A signal called TTL on pin 9 and another control signal, BD on pin 11
I would love to get this running again.
Thanks,
Bob
11 May
11 May
2:14 p.m.
New subject: HP 1820-1584 IC replacement?
I have an HP 9872 plotter that just died. According to the internal self
test (very nice!)
one of the bib (MOS to TTL) drivers has failed. A scope shows one data
line not moving also.
The HP part number is 1820-1584. I can't find a cross reference on the
web for it. Does anyone
know if there's an equivalent chip? It's a 20 pin dip.
I know the chip well, it turns up in a lot of HP devices of that date. I
am pretty sure there are qite a few i nthe HP9825 and 9845 machines, for
example.
I know of no replacement. It was never corss-referenced in Bench Briefs
to my knowledge. Evey one I ahev see had had an HP logo on the package.
And the MOS side is somewhat odd votlage levels.
Your best bet, I think, is to try to find soemthing else that uses them
(look at HP9825, HP9845, boards and soem of the peripehral modules for
said machines) and see if you can get a dead board to strip the ICs from.
-tony
24 Mar
24 Mar
8:26 p.m.
On 3/24/2013 5:38 AM, Lawrence Wilkinson wrote:
I've been working on an IBM Selectric typewriter
which I bought earlier
in the year. It is the I/O Selectric type 735 which differs from a
normal Selectric in having the solenoids and switches on it to allow it
to be used as a printer and keyboard.
Thanks for that; it really brings back some fond memories. I'm not sure
it was exactly that model, but we had one very similar as the "console
interface" attached to an SDS-910 back in the late 1960's. It might
have been the pin feed model someone else mentioned. The ones we
shipped to the field held up fine, but the few that we kept in the test
department really got beat up because we printed so much of what we read
from the attached OCR system. Seems like we had to
have the IBM repair
guy out to fix one of them every week or so.
--
Later,
Charlie C.
In God We Trust!!!
11:11 p.m.
On 03/24/2013 08:26 PM, Charlie Carothers wrote:
Thanks for that; it really brings back some fond
memories. I'm not sure
it was exactly that model, but we had one very similar as the "console
interface" attached to an SDS-910 back in the late 1960's. It might
have been the pin feed model someone else mentioned. The ones we
shipped to the field held up fine, but the few that we kept in the test
department really got beat up because we printed so much of what we read
from the attached OCR system. Seems like we had to have the IBM repair
guy out to fix one of them every week or so.
Also used on various S/360 models. The keyboard stayed locked as long
as the multiplexor channel was busy---but then, I've mentioned the fun
of chaining CCWs to make sure that the uppity operator will never be
able to type anything... :)
--Chuck
9 p.m.
Very, VERY nice work!
-Dave
On 03/24/2013 06:38 AM, Lawrence Wilkinson wrote:
I've been working on an IBM Selectric typewriter
which I bought earlier in
the year. It is the I/O Selectric type 735 which differs from a normal
Selectric in having the solenoids and switches on it to allow it to be used
as a printer and keyboard.
When I got it the motor wouldn't run, and the mechanism was jammed. The motor
problem was its thermal trip, which is meant to be the resettable type, so I
replaced that. I gave the whole thing a clean with degreaser, which freed up
the mechanicals, then oiled and greased it. It then worked happily as a
typewriter.
I have made a small interface, based on an Arduino Mega 2560, which provides
a serial port. Currently this only supports printing, but will be extended
to include the keyboard. It uses almost all the digital I/O on the Mega (15
solenoids, 27 contacts.)
There are still some adjustments to be done, and I am awaiting a set of
Bristol Wrenches (Keys) so I can safely do these. I have tried using Torx
and Allen keys, and while they can be made to 'fit', it doesn't seem like a
good idea.
There are some pictures and videos of the typewriter here:
http://www.flickr.com/photos/ljw/sets/72157632841492802/
You can get the Arduino interface code here:
https://github.com/ibm2030/IOSelectric
I haven't yet documented the hardware I used for the solenoid drivers, but if
anyone is interested I can put some notes together (basically: Arduino output
to 2N7000 FET buffer to ITS4140N +48V high-side driver on the output side,
and a simple 250R pullup to +5V on the input side.)
Manuals here:
http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/typewriter/selectric/
(or other Bitsavers mirrors)
Info on the Mega2560 here: http://arduino.cc/en/Main/arduinoBoardMega2560
--
Dave McGuire, AK4HZ
New Kensington, PA
4012
days inactive
4060
days old
12 comments
8 participants
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