> From: Paul Birkel
> Note that 1170mP_Jul77_text.pdf also includes some additional MKA11
> information, and improved diagrams.
Umm, where is that? I just looked, couldn't find it online? (Clearly my
Google-fu is pretty weak... :-)
Noel
I have an older (dark grey) HP rack that has a front door on it. The top
2/3rds of the door is closed off metal (dark cream color). The bottom 1/3rd
is a dark brown/grey plastic vent. In the area that is vented, I'm missing
one of the vent/slotted panels to fully close it off. I used to have a 7900A
drive sticking through this opening, but no more (not in the current
configuration being built).
I'm building a machine to (hopefully) take to a VCF show, and would like to
obtain another one of those vent panels to properly fill up the opening.
Ideally, I'd like to buy/trade for one of those panels and keep it. But if
you have one that you don't want to let go of, I'd at least like to borrow
it for a few months for the show and then could return it.
Does anyone have one of these plastic vent panels?
Best,
J
I made an inventory of the defective TTL?s I have, other than I initially though there is a reasonable spread over types and brands.
Other than the NS DM7400 there are no types with an extensive failure rate.
The list talks for itself.
-Rik
Type
HP Number 1820-
Quantity
Brand
CER
Date
7495AN
1
Siemens
7417
8H08/74H08
1
??
PCF7427
93L00PC
1
7302
9N03/7403
1
Fairchild
7328
DM7400N
14
National Semiconductor
352,422,424,401,351,435,315,215
DM7403N
4
National Semiconductor
315
DM7404N
5
National Semiconductor
317,315
DM7408N
2
National Semiconductor
307
DM7410N
2
National Semiconductor
308,217
DM74121N
6
National Semiconductor
313,315,314
DM74195N
1
National Semiconductor
241
DM7420N
1
National Semiconductor
211
DM7432N
2
National Semiconductor
314,413
DM7474N
5
National Semiconductor
435,349
DM7493N
1
Texas Instruments
7252
DM7495N
2
National Semiconductor
242,241
DM74H00N
1
National Semiconductor
334
DM74H08N
1
National Semiconductor
229
DM74L00N
1
National Semiconductor
337
DM74L04N
3
National Semiconductor
313,351
DM74L10N
1
National Semiconductor
423
DM74L74N
1
National Semiconductor
316
DM74L86N
1
National Semiconductor
317
DM74LS373N
1
National Semiconductor
8005
N8885A
1
Signetics
7402
N8T20N
1048
1
Signetics
7915
SN7400J
1
Texas Instruments
7313
SN7400N
2
Texas Instruments
7405,7335
SN7402N
1
Texas Instruments
AS7419
SN7404N
3
Texas Instruments
7344,7402,AS7406
SN7406N
0471
1
Texas Instruments
8044S
SN7407N
0668
2
Texas Instruments
H7845,AS7414
SN74107N
2
Texas Instruments
7945B,7414
SN74121J
1
Texas Instruments
X
7326
SN74123N
0579
4
Texas Instruments
7406,8014
SN74155N
2
Texas Instruments
7222
SN7416N
1
Texas Instruments
AHA741
SN74191N
1
Texas Instruments
M7628
SN74193N
3
Texas Instruments
FF7606,FF7536
SN74193N
1
Texas Instruments
7516
SN7451N
1
Texas Instruments
7427
SN7474N
1
Texas Instruments
7339
SN7475N
1
Texas Instruments
7349
SN7493AN
1
Texas Instruments
7235
SN7493AN
1
Texas Instruments
AS7344
SN7495AN
4
Texas Instruments
BS7402,7227,7244
SN7495N
1
Texas Instruments
7401
SN7496N
1
Texas Instruments
M7331
SN74H00N
1
Texas Instruments
7135
SN74H01N
1
Texas Instruments
BS7423
SN74H01N
1
Texas Instruments
7252
SN74H04N
2
Texas Instruments
7527,AS7406
SN74H101N
2
Texas Instruments
7217,7336
SN74H108N
1
Texas Instruments
7205
SN74H40N
1
Texas Instruments
7510
SN74H74N
0512
1
Texas Instruments
7419
SN74L04N
2
National Semiconductor
218,313
SN74L42N
1
Texas Instruments
7312A
SN74LS00N
1
Texas Instruments
M7523
SN74LS03N
3
Texas Instruments
7945
SN74LS08N
1201
1
Texas Instruments
7801
SN74LS244N
1
Texas Instruments
8432B
SN74LS257AN
1438
1
Texas Instruments
7927B
SN74S04N
1
Texas Instruments
UK7949
SN74S374N
2
Texas Instruments
M7919X,F9022X
7400
0054
1
Motorola
7315
7410
0068
2
Motorola
7245,7443
7473
0075
1
National Semiconductor
217
7474
0077
2
National Semiconductor
212
74H08
0141
6
National Semiconductor
228,217,604,229,228
MC3001
0141
1
Motorola
7326
7404
0174
1
National Semiconductor
543
7405
0175
1
National Semiconductor
037M
7405
0175
1
National Semiconductor
947
MC3003 / 74H32
0205
1
Motorola
7513
74121
0261
1
Texas Instruments
7410
74121
0261
1
National Semiconductor
425
7403
0269
4
National Semiconductor
345,428
CA3028A
0306
1
National Semiconductor
413
7402
0328
2
National Semiconductor
527,532
7402
0328
1
Motorola
7248
74H00
0370
1
Motorola
7413
74H00
0370
1
Fairchild
7237
74H40
0376
1
Motorola
7334
74H04
0424
1
National Semiconductor
231
7408
0511
6
Fairchild
F7421,F7407,F7409,F7428
7413
0537
1
National Semiconductor
533
74L00
0583
1
National Semiconductor
521
74L02
0584
3
National Semiconductor
222,231
74L10
0587
1
National Semiconductor
514
74L30
0589
1
National Semiconductor
232
74L54
0591
1
National Semiconductor
521
74L74
0596
1
Fairchild
X
SL3459
74L86
0598
3
National Semiconductor
405
9322PC
0616
1
Fairchild
352
9322PC
0616
1
Fairchild
X
7221
9324PC
0706
1
Fairchild
7735
9328PC
0741
2
Fairchild
X
7240,7309
74C175
1562
2
Signetics
L147,B104
74C175
1562
1
National Semiconductor
011
-----Oorspronkelijk bericht-----
Van: "Kyle Owen" < <mailto:kylevowen at gmail.com> kylevowen at gmail.com>
Verzonden: ?11-?2-?2015 23:57
Aan: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
Onderwerp: Failed ICs and components
I am writing my master's thesis on accelerated life testing and would like
to get a collection of parts to decap and experiment on. What prompted my
study is a failed 7474 dual flip-flop in a PDP-8/E. As I later read (on
here, I believe) was that the 7474s seem to fail in higher number than
other 7400-series ICs. Is this because of a design flaw? I'm not sure
(yet), but would like to find out.
More recently, I saw a 680k 2W carbon resistor that read 1.3 meg out of
circuit. As it turns out, it was in a high voltage portion of the circuit,
and I suspect that electromigration caused its failure over time. Many of
you are probably already aware that carbon resistors tend to increase in
value as they age, though there are a few explanations too for that
behavior, as I understand it.
I would like to tie all of this together by researching older accelerated
life testing schemes, examine how those parts actually fared, and see how
current day models might be improved.
If anyone has a collection of dead ICs (preferably those that have died
inexplicably, and not by extreme overvoltage, for instance), I would like
to talk to you about getting a few. If they are 7474s from Texas
Instruments, ca. early 1970s, even better!
Thanks in advance,
Kyle
I have an LA12 that's mising the "DATA/TALK" key. Does anyone have or know of
a junked LA12 keyboard from which I can take that key? Failing that, would a
VT100 key physically fit? How about 3D-printing the key?
--
David Griffith
dave at 661.org
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
I have an LA12 that's mising the "DATA/TALK" key. Does anyone have or
know of a junked LA12 keyboard from which I can take that key? Failing
that, would a VT100 key physically fit? How about 3D-printing the key?
--
David Griffith
dave at 661.org
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
> From: Glen Slick
>> "jwsmobile" <jws at jwsss.com> wrote:
>> Mr. 544 feedback is being trolled by 0 and 1 feedback idiots.
> Ended at just under $23K USD
Interestingly, although the winning bidder was pushed up an extra 1K by one of
those feedback-1 trolls, there were a couple of real bidders right underneath
them. So that price is _basically_ real; three people all felt it was worth
roughly that.
It's so bizarre, the way some stuff is in such demand, and other stuff is
basically totally unwanted.
I told this guy:
http://www.ebay.com/itm/221685737714
there was no way he'd get that much for that set of cards, and he was like
'but some of this old computers stuff is going for a ton of money'. I was
like, 'For things which are in short supply, and in demand, yes; neither of
those is true of M8044/M8045's....' (Although for them, it's understandable;
there are plenty of higher-density QBUS memory cards going for not much.)
Noel
> Message: 27
> Date: Sun, 15 Feb 2015 15:24:13 +0000
> From: tony duell <ard at p850ug1.demon.co.uk>
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk at classiccmp.org>
> Subject: RE: proper chemical / glue for 11/45 switch repair?
> Message-ID:
> <A8192EF71C5C4946A240D25EDC8F9448027B4533 at EXMBX16.thus.corp>
> Content-Type: text/plain; charset="us-ascii"
>
>
>> An -11 owner would be able to say for certain, but the old model
>> airplane solvent glue was methyl chloride. It's also in a lot paint
>> stripper as well. "Tenax" model glue is a name that comes to mind.
>
> In the UK, dichloromethane (same stuff) is sold under the brand name
> 'Plastic Weld', It is _by far_ the best way of mending plastics that it
> will
> disolve. And I think DEC front panel toggles fit into that category.
>
> That said, trying to glue the pivot pins back on to the toggle is going
> to be (IMHO) a waste of time. The area is just so small. Personally, I
> would
> drill through the toggle (make sure it's in the exact right direction) and
> put
> a metal pin through.
>
> -tony
It has been done! I did it on my switches on the old 8/L.
http://www.abc80.net/zz/pdp8/DSC_9858.JPGhttp://www.abc80.net/zz/pdp8/DSC_9864.JPGhttp://www.abc80.net/zz/pdp8/DSC_9865.JPG
I used the core from a copper wire 1,5mm2 since the diameter turned out to
be perfect.
/Anders
On Feb 13, 2015 9:58 AM, "jwsmobile" <jws at jwsss.com> wrote:
>
>
> On 2/13/2015 8:01 AM, Geoffrey Oltmans wrote:
>>
>> I presume I can't be the only one watching this eBay auction in
disbelief.
>> I'm wondering if this is a museum or not. Presumably a private collector
>> would not have such deep pockets, but you never know!
>>
>> Over $13k USD and still a little less than 2 days to go!
>>
> Ultra-rare-Commodore-65-C65-DX64-prototype-working-serial-22
>
> http://www.ebay.com/itm//171673209321
>
> Mr. 544 feedback is being trolled by 0 and 1 feedback idiots. One has to
wonder.
>
> I wouldn't use this auction as a reference in an appraisal.
>
> Jim
Ended at just under $23K USD (?20,050)
