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- Wai Sun
Wai Sun Chia
Owner at Squid Consulting & Integration
Malaysia
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LinkedIn
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General,
I'd like to add you to my professional network on LinkedIn.
- Wai Sun
Wai Sun Chia
Owner at Squid Consulting & Integration
Malaysia
Confirm that you know Wai Sun Chia
https://www.linkedin.com/e/djnwms-giuxf0hz-71/isd/2134541438/V55UmQ-z/
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(c) 2010, LinkedIn Corporation
LinkedIn
------------
I'd like to add you to my professional network on LinkedIn.
- Wai Sun
Wai Sun Chia
Owner at Squid Consulting & Integration
Malaysia
Confirm that you know Wai Sun Chia
https://www.linkedin.com/e/rs1ho6-giuxeoqh-2m/isd/2134540464/iiwlQPzs/
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(c) 2010, LinkedIn Corporation
Hi
I have an ASR33 that is similar. I've just not had time
to tinker with it.
When I got it, it seemed to be missing the power board
for the reader. I finally made one with a piece of
vector board.
I had the machine and stand shipped in two packages.
I'd not opened the stand because I had't finished
fiddling with the unit.
I needed to make a little more space and guess
what I found in the box for the stand. you guessed
it, the supply board for the tape reader.
The H plate is easy to do, jammed on the end of
a screw driver blade.
Dwight
> I still didn't have the guts to try and disassemble the typing unit
> or the keyboard, but with access to their undersides, I was able to
Puty, becaue it really isn't that hard. If i could do it without the
manuals and without this list while still at school, then you can do it
now :-)
> problems remained, no line feed and no bell. I took the typing unit
> back out and looked carefully at the area of the line feed mechanism.
> It was substantially different from the illustrations in the documents.
Do you have the partsbook? I find it to be one of the most useful manuals
for the Model 33 becuase of all the exploded diagrams. Anyway, the
partsbook I have shows 2 different versions of the friction-feed platten
mechanism. The older one has ratchet teeth at both ends of the platten,
the later one only at the left side.
[..]
> The punch seemed like it would be almost trivial. It was, _almost_. The
> punch essentially just bolts onto the side of the typing unit. There are
> eight small levers that control which holes are punched and there is a
> large lever that provides the "power". The small levers simply drop into
> place, connecting with push rods in the typing unit. The large lever
> connects to a rotating shaft in the typing unit. Here's where the trick is.
> The lever connects to the shaft via a sleeve. The shaft has holes all the
> way through it, the sleeve has holes on both sides and screws go all the
> way through the sleeve and the shaft. There is almost no play in the
> connection... almost. I took out the KSR typing unit and transferred the
> punch mechanism to it.
>
> I put the KSR typing unit back in, threaded in some tape and tried it.
> Shredded
> tape. What??? Everything sure looked OK. The "bit" levers looked like
> they were all moving correctly, the large lever seemed to be going through
> its motions. I spent a long time watching it. Finally, I tried putting it
> back on the ASR typing unit. Shredded tape. WHAT!!! What could possibly
> have changed? Maybe I attached the sleeve for the large lever to the wrong
> holes? No, those are the only holes in the shaft. That's when I noticed
> that little bit of play. Just three or four degrees. That couldn't
> possibly make any difference, could it? I held the play all the way
> clockwise
> and tightened the sleeve screws. Shredded tape. I loosened up the sleeve,
> held the play all the way counter-clockwise and retightened. Perfect! I
> moved the punch back to the KSR typing unit and, with my new knowledge, got
> it attached and working.
That link is actually in 2 parts -- the sleeve that clamps to the shaft
and the crank plate that carries the link to the punch. They re held
together by a screw. Loosening that gives you quite a bit of adjustment
(10's of degrees)(, and that's waht you should be using.
>
> After the punch experience, I spent a very long taking exact measurements of
> the reader control mechanism that needed to be moved to the KSR typing unit.
> It is a complicated little assembly, consisting of a cam controlled lever
> that moves based on whether a solenoid is energized and in turn opens and
> closes a switch as the cam rotates. It looked like the location tolerances
> of the whole thing would be about a sixteenth of an inch. There is a spring
> that attaches to the lever and keeps it pressed tight against the cam. I
> transferred the mechanism. Attaching the spring turned out to be the
> hardest
> part of the whole job. The lever end of the spring is "permanently"
It's a lot easier if you remove the transmitter shaft first. Take the
distributoir unit apart, then unto the clamps over the bearings and
essentailly the shaft justlifts out.
> attached,
> but the other end has to thread through a tight space and hook over a small
> pin that is part of the typing unit frame. I fooled with it for more than
> an
> hour. What finally worked was to tie some plastic fishing line to the end
> of
> the spring, guide the line to the pin and use the line to stretch the spring
> over to the pin. I used a piece of "coat hanger" wire to coax the loop at
> the
> end of the spring over the pin and then finally reached in with a long thin
> scalpel to cut the line and pull it out.
Many years ago I bought a set of speing hooks spedifically for doing
things like this. They weren't cheap, but they've saved a lot of bad
lanugage over the years :-)
>
> "There's the easy part done," I said to myself. I figured I would spend the
> rest of the day getting the lever, solenoid and switch lined up correctly.
> I put the KSR... well, now it was really the ASR, typing unit back in and
> fired it up. The bit gods, or maybe Rube Goldberg himself, smiled upon me.
> It worked the first time.
Actually, I've never hand any problems getting that part to work first
time...
-tony
> I should point out here that, while I'm not bothered by the complexity
> of electronic circuits, I find mechanical complexity (lots of levers,
> gears, cogs and the like) a bit intimidating.
I guess I had a mis-spent childhood. I grew up taking mechanicla things
apart, and more importantly putting them together again. When I got my
first ASR33 (back in 1985 I think), I didn't have the maniuals, there
were no mailing lists like this (at least not in the UK), but I still,
very carefully, took it apart, right down to the last nut and bolt. And
then put it together again.
I would like to say it worked first time, but that would be a lie. No,
I'd mis-assembled the feed-supression linkage so that it moved the
carriage on control codes. But it didn't take me too long to figure htat
out too.
-tony
Thanks to Pete Turnbull's FindCSR (entering it once by hand was
enough) :) and reading another manufacturer's DHV11/16 documentation
dug up on Bitsavers, I now know my CSR.
Actually, two of them, 160140 and 160160, since I have learned that a
DHV11/16 appears to the 11/23+ as two DHV11 8-line cards with
consecutive address spaces modulo 20 octal.
Then I could run the various DHV11 diagnostics from my XXDP pack, and
the first time through on VDHAE0, it found the card but stopped on an
ILL INT 430 error. So I took the hint and entered 430 instead of the
default 300 for the vector interrupt address. Then Unit 1 passed the
tests, but Unit 2 had an ILL INT 440 error. Another clue :) With 440
for the 2nd vector it passed all tests.
Now to make sure it's not conflicting with my RLV12 controller, make a
cable for the user terminal, and start fumbling with TSGEN.MAC and
other TSX-Plus files!
All I need is a few VT100's and this will be 100% identical to the
system I used at my first EE job (in 1981) :)
-Charles
dwight elvey wrote:
> I needed to make a little more space and guess
> what I found in the box for the stand. you guessed
> it, the supply board for the tape reader.
That is the same way mine is configured. I think it
is using the whole stand as a heat sink.
> The H plate is easy to do, jammed on the end of
> a screw driver blade.
Like I said, "once you get the knack".
Bill
