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Science Forum Index » Electronics - Components Forum » 1K static shift registers wanted (2533V, Am2833,...
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| Eric Smith... |
 Posted: Wed May 07, 2008 8:17 pm |
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I'd like to buy at least 7 pieces, and preferrably 30 or more, of any of the
old PMOS 1K static shift registers:
Signetics 2533V
AMD Am2533 or Am2833
National MM5058
TI TMS3133
There are probably other equivalents as well. DIP is preferred, but I
suppose I could deal with metal can parts.
Google turns up the usual parts brokers, but the brokers don't even
bother replying to requests for quotes.
I'd rather not have to design a daughter board to replace these parts,
though if I did I think a PIC in an MLF package, a surface mount voltage
regulator, and a few ceramic caps would do the job. |
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| Michael A. Terrell... |
| Posted: Thu May 08, 2008 10:49 am |
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Eric Smith wrote:
Quote:
I'd like to buy at least 7 pieces, and preferrably 30 or more, of any of the
old PMOS 1K static shift registers:
Signetics 2533V
AMD Am2533 or Am2833
National MM5058
TI TMS3133
There are probably other equivalents as well. DIP is preferred, but I
suppose I could deal with metal can parts.
Google turns up the usual parts brokers, but the brokers don't even
bother replying to requests for quotes.
I'd rather not have to design a daughter board to replace these parts,
though if I did I think a PIC in an MLF package, a surface mount voltage
regulator, and a few ceramic caps would do the job.
Weren't all of those obsolete in the early '70s?
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| Michael Black... |
| Posted: Thu May 08, 2008 1:22 pm |
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On Thu, 8 May 2008, Michael A. Terrell wrote:
Quote:
Eric Smith wrote:
I'd like to buy at least 7 pieces, and preferrably 30 or more, of any of the
old PMOS 1K static shift registers:
Signetics 2533V
AMD Am2533 or Am2833
National MM5058
TI TMS3133
There are probably other equivalents as well. DIP is preferred, but I
suppose I could deal with metal can parts.
Google turns up the usual parts brokers, but the brokers don't even
bother replying to requests for quotes.
I'd rather not have to design a daughter board to replace these parts,
though if I did I think a PIC in an MLF package, a surface mount voltage
regulator, and a few ceramic caps would do the job.
Weren't all of those obsolete in the early '70s?
They certainly were a temporary thing, "the best thing" until static
ram (as in Random Access Memory) as we know it came along.
I have no idea how common they were in commercial equipment, but I
know that it was a period when hobbyists were ready to build digital
things and the available memory was limited.
I seem to recall Don Lancaster's original TV Typewriter used shift
register memory, and then there was promptly a second model that used
normal RAM.
THere was also a wave of converters for slow scan television, and the
issue of availability was always there at the time. "Oh, there's a
supply. Wait, it's gone.".
So they definitely seemed hard to get a the time, though that may
be skewed by hobby access to such things.
But yes, they were obsoleted at least 30 years ago (and that
gives a big gap for transistion), very few applications actually
benefitted from a serial format. They were also pretty low density
memory.
Given that the function has easily been replaced, I suspect there
are few stashes of shift register memory lying around. Comparatively
little to start with, easily discarded when better stuff came along,
and little in the hands of individuals to sit on the shelf for decades.
Michael |
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| Eric Smith... |
| Posted: Thu May 08, 2008 2:19 pm |
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Michael A. Terrell wrote:
Quote: Weren't all of those obsolete in the early '70s?
They were still being made in the mid-1980s, but no one with any
sense was choosing them for new designs. |
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| Jim Backus... |
| Posted: Sun May 11, 2008 5:26 am |
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On Thu, 8 May 2008 01:17:14 UTC, Eric Smith <eric at (no spam) brouhaha.com> wrote:
Quote: I'd like to buy at least 7 pieces, and preferrably 30 or more, of any of the
old PMOS 1K static shift registers:
Signetics 2533V
AMD Am2533 or Am2833
National MM5058
TI TMS3133
I gave away a tube of something like that about 18 months ago to
someone who was restoring an old eletronic organ. Might be able to
find email correspondence and suggest he contacts you.
--
Jim Backus running OS/2 Warp 3 & 4, Debian Linux and Win98SE
bona fide replies to j <dot> backus <the circle thingy> jita <dot>
demon <dot> co <dot> uk |
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| Michael A. Terrell... |
| Posted: Sun May 11, 2008 5:19 pm |
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Jim Backus wrote:
Quote:
On Thu, 8 May 2008 01:17:14 UTC, Eric Smith <eric at (no spam) brouhaha.com> wrote:
I'd like to buy at least 7 pieces, and preferrably 30 or more, of any of the
old PMOS 1K static shift registers:
Signetics 2533V
AMD Am2533 or Am2833
National MM5058
TI TMS3133
I gave away a tube of something like that about 18 months ago to
someone who was restoring an old eletronic organ. Might be able to
find email correspondence and suggest he contacts you.
Those were bucket brigade analog shift registers, not digital. Wrong
species, and way too slow. :(
--
http://improve-usenet.org/index.html
Use any search engine other than Google till they stop polluting USENET
with porn and junk commercial SPAM
If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm |
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| Eric Smith... |
| Posted: Mon May 12, 2008 12:16 am |
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I wrote about needing a source for 1K static shift registers, and
Jim Backus replied:
Quote: I gave away a tube of something like that about 18 months ago to
someone who was restoring an old eletronic organ. Might be able to
find email correspondence and suggest he contacts you.
Thanks for the offer. As it happens, a friend saw my posting and
offered me a tube of National MM5058 parts, so I've got more than
enough for my project.
Eric |
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| Jim Backus... |
| Posted: Thu May 15, 2008 10:43 am |
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On Sun, 11 May 2008 22:19:52 UTC, "Michael A. Terrell"
<mike.terrell at (no spam) earthlink.net> wrote:
Quote: I gave away a tube of something like that about 18 months ago to
someone who was restoring an old eletronic organ. Might be able to
find email correspondence and suggest he contacts you.
Those were bucket brigade analog shift registers, not digital. Wrong
species, and way too slow. :(
Check my posting to this NG on 9th December 2006. The request was
specifically for static shift registers.
IIRC bucket brigade devices didn't appear until several years later
than the "early '70s".
--
Jim Backus running OS/2 Warp 3 & 4, Debian Linux and Win98SE
bona fide replies to j <dot> backus <the circle thingy> jita <dot>
demon <dot> co <dot> uk |
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| Michael A. Terrell... |
| Posted: Thu May 15, 2008 9:58 pm |
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Jim Backus wrote:
Quote:
On Sun, 11 May 2008 22:19:52 UTC, "Michael A. Terrell"
mike.terrell at (no spam) earthlink.net> wrote:
I gave away a tube of something like that about 18 months ago to
someone who was restoring an old eletronic organ. Might be able to
find email correspondence and suggest he contacts you.
Those were bucket brigade analog shift registers, not digital. Wrong
species, and way too slow. :(
Check my posting to this NG on 9th December 2006. The request was
specifically for static shift registers.
IIRC bucket brigade devices didn't appear until several years later
than the "early '70s".
And static shift registers weren't used in electric organs.
--
http://improve-usenet.org/index.html
Use any search engine other than Google till they stop polluting USENET
with porn and junk commercial SPAM
If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm |
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