07 May 2008 18:17:14

Eric Smith

1K static shift registers wanted (2533V, Am2833, MM5058, TMS3133)

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.

08 May 2008 11:49:42

Michael A. Terrell

Re: 1K static shift registers wanted (2533V, Am2833, MM5058, TMS3133)

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? -- 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

08 May 2008 14:22:02

Michael Black

Re: 1K static shift registers wanted (2533V, Am2833, MM5058, TMS3133)

On Thu, 8 May 2008, Michael A. Terrell wrote: > 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

08 May 2008 12:19:55

Eric Smith

Re: 1K static shift registers wanted (2533V, Am2833, MM5058, TMS3133)

Michael A. Terrell wrote: > 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.