test-drb September 2016

test-drb@ccmp.vtda.org

162 participants
227 discussions

by COURYHOUSE＠aol.com

In a message dated 9/6/2016 11:55:46 P.M. US Mountain Standard Time, pontus at Update.UU.SE writes: On Tue, Sep 06, 2016 at 06:16:23PM -0700, Al Kossow wrote: > > I walked out of the donations meeting with the other curators today > who thought it was a piece of s**t and didn't want to take it, calling > it a 'dumpster fire' > Wow, what an attitude.. I don't know much about Unicomps but should lesser know machines but unusual machines be preserved as well? /P Right on... All machines are part of the overall history, true, some more significant than others but... ALL have a place. Good thing about lists like this is someone can be found to adopt some of these systems. Ed#

7 years, 8 months

Why V.32bis modems are 14400 bps rather than 19200 bps (was Re: vt100 terminfo with padding for an actual vt100?)

by spacewar＠gmail.com

On Tue, Sep 6, 2016 at 5:18 PM, Eric Christopherson <echristopherson at gmail.com> wrote: > Is this why modems went to 14400 instead of 19200? No, that was because the V.32 modulation was easily extended to 12000 and 14400 bps by slightly expanding the QAM signal constellation, requiring a little better SNR on the line, but keeping other parameters the same and increasing the constellation size enough to get 19200 bps was not expected to work within available SNR on most POTS lines. That didn't stop some vendors from offering 19200 as a proprietary extension to V.32bis. It's known unofficially as V.32ter, but was never actually ratified as an ITU-T V-series recommendation. V.32 at 9600bps uses 1800Hz carrier, 2400 baud, and 32 carrier states (constellation points) using one trellis coding bit for 4 data bits, so effectively 4 data bits per baud, and 2400 * 4 = 9600 bps. V.32bis at 14400bps uses the same carrier and baud rate, and 128 carrier states (constellation points), with slightly more complex trellis coding, so effectively 6 data bits per baud, and 2400 * 6 = 14400 bps. (There's also a fallback to 12000 bps) V.32 and V.32bis are synchronous modulation, and when used with V.42 error control and a normal serial port configuration of 8N1, the modem effectively removes the start and stop bits (20% overhead on the serial port), though framing is added so that the throughput doesn't go up by that full amount. This is noticeable when running such a modem with a higher serial port baud rate (requiring flow control). For instance, a V.32 9600bps modem without V.42 would be able to transfer 960 characters per second, but with V.42 and a higher serial port rate with flow control, can exceed that. V.42bis compression can further improve the throughput provided that the data is compressible. To go beyond 14400 bps with conventional modulation and typical POTS line SNR requires more complex techniques, used in V.34 for up to 33600 bps. Abandoning conventional modulation and introducing a direct dependency on the PCM line code used within the PSTN allows up to 56000 bps PCM downstream and 33600 bps using V.34 modulation upstream (V.90), or 56000 bps PCM downstream and 48000 bps PCM upstream (V.92)

7 years, 8 months

Complete DisplayWriter on eBay

by cctalk＠ibm51xx.net

Well, looks like the seller cancelled the bids and suddenly item is no longer available. Would like to believe it is a mistake but we all know better... -Ali

7 years, 8 months

Components available

by COURYHOUSE＠aol.com

In a message dated 9/6/2016 10:13:30 P.M. US Mountain Standard Time, derschjo at gmail.com writes: On 9/6/16 9:09 PM, Jason Howe wrote: > On 09/06/2016 08:59 PM, Mark Linimon wrote: >> On Tue, Sep 06, 2016 at 06:16:23PM -0700, Al Kossow wrote: >>> There is also a Unicomp 18 bit minicomputer, paper tape reader, >>> and FFT processor circa 1972 in the garage (6ft rack) with full >>> documentation. >> I think it would be a damned shame if this went to recycling. I can't >> drive the 30 hours to come get it though. (tbh the '99 pickup truck >> does not have that kind of trip left in it anyways.) >> >> mcl > That sounds amazing. I'm in Seattle. My time is pretty tight these > days, but if someone up here was interested, I might be persuaded to > do a tag-team driving run over a weekend. My '81 Ford has plenty of > life left in her. > > I don't think I'm interested in it personally though, as I really have > no idea what an Unicomp minicomputer is in the grand scheme of things... > > --Jason > I'd join you on that trip, except I have no idea where I'd fit another 6' rack at the moment... ah, physical space is a harsh mistress... - Josh think of it this way... if you have an 8 something foot ceiling and you have a row of 6 foot tacks there is room for one more rack.... LAYING ACROSS THE TO SIDEWISE! Ed# <grin!>

7 years, 8 months

Components available

by COURYHOUSE＠aol.com

I just do not do the long drive well any more I remember I would drive straight from AZ to San Jose non stop.... Now I think I would have to break it into a 4 day trip to be comfortable. When it comes to large trucks I just do not do them any more. The cost of shipping has gotten so high ( or maybe it is just the money is just worth less now) Ed# (wishing he was 40 years younger sometimes!) _www.smecc.org_ (http://www.smecc.org) In a message dated 9/6/2016 8:59:10 P.M. US Mountain Standard Time, linimon at lonesome.com writes: On Tue, Sep 06, 2016 at 06:16:23PM -0700, Al Kossow wrote: > There is also a Unicomp 18 bit minicomputer, paper tape reader, > and FFT processor circa 1972 in the garage (6ft rack) with full > documentation. I think it would be a damned shame if this went to recycling. I can't drive the 30 hours to come get it though. (tbh the '99 pickup truck does not have that kind of trip left in it anyways.) mcl

7 years, 8 months

Apple IIGS on epay - local pickup in Seattle

by echristopherson＠gmail.com

Anyone want this? Less than 4 his remaining. Actually I'd love to have someone win it for me and sell it to me at VCFMW, but I've never arranged such a thing so I don't know what to estimate the cost to me would be. (Plus it probably won't stay at $49 for long.) I'd bid on it myself and then worry about getting it to me, but they explicitly day they don't accept third-party shippers.

7 years, 8 months

The huge lot that had the NIB 8" floppies is now on ebay

by jnc＠mercury.lcs.mit.edu

> From: js > That would be my preference as well. A "ccebay at classiccmp.org" list. I think we all know that wouldn't work, for a number of reasons. > Or at least in an indication in the subject line "ebay: [topic]" so > they can get filtered out. This, however, I can definitely see as a good move. I will add such a tag to any eBay notification posts I make, and I encourage everyone else who posts such to do the same. > From: Peter Coghlan >> It's a tiny bit more work to use them > Any given posting to a mailing list is sent by one person and read by > many. If there is a small effort to be made, it makes more sense for > the sender to make it once than all the interested recipients to have > to duplicate the effort. Excellent point. And the "eBay:" tag idea follow this principle too, I will note... So let's remember to add that tag, everyone! Noel

7 years, 8 months

Components available

by COURYHOUSE＠aol.com

Yes it needs to be saved... and yet with all the extra and duplicate stuff CHM has I bet they do not have one of these yet shun it... curious. kick their shins for me Al ok? Unfortunately not close for me to pickup. all this stuff is all part of the history.... Ed# In a message dated 9/6/2016 6:11:35 P.M. US Mountain Standard Time, aek at bitsavers.org writes: On 9/6/16 4:18 PM, Tom Gardner wrote: > A friend of mine died recently; he was amongst many things an electronics tinkerer and has a closet full of small parts in bin cabinets (resistors, capacitors, ICs, transistors, hardware, etc.). There is also a Unicomp 18 bit minicomputer, paper tape reader, and FFT processor circa 1972 in the garage (6ft rack) with full documentation. I walked out of the donations meeting with the other curators today who thought it was a piece of s**t and didn't want to take it, calling it a 'dumpster fire' Art was a friend of mine. Hopefully it can go someplace where it can be appreciated. Talk to Tom about it, unfortunately, time is short.

7 years, 8 months

More mystery recycler boards - DEC, Fujitsu(??), Cipher, Emulex

by jules.richardson99＠gmail.com

Hi All, My local recycler contacted me to say he'd had some more old boards come in. They're scheduled to be sent for processing next Wednesday, but in a couple of hours I'm heading out of town for a few days - it's possible I can rescue some of it next Tuesday when I'm back, so in the meantime comments as to whether anything is useful/important/etc. would be appreciated! Apologies for photo quality, in a hurry and the only vacant spot was the floor of the employee bathroom :-( __Digital boards:__ M8014 M8012 M8061 (x2) M8013 - I think the 8012 is a boot/terminator board, so that sounds handy. The 8061's and M8013 are disk, I think - do modern emulators of the drives exist? If they do, maybe I should snag the controllers? Not sure about M8014. http://www.classiccmp.org/acornia/ub/d1.jpg - terminal board? DB25F and BNC on one edge. There was another similar board with two BNCs and a DB25F which was marked "VT100 basic video" on the underside, so I'm assuming this is related. http://www.classiccmp.org/acornia/ub/d2.jpg - 8085 CPU, ROM, RAM etc. Rows of transistors which perhaps suggests motor control, i.e. printer? http://www.classiccmp.org/acornia/ub/d3.jpg - related to d2.jpg?? __Fujitsu boards:__ At least, the main ICs are Fujitsu; there's no indication who the boards belong to. These are standalone boards, not ones that plug into a backplane. My hunch is that they're logic board pulls from old hard disks or tape drives - i.e. they're just garbage now. http://www.classiccmp.org/acornia/ub/f1.jpg - 2x 50-way connectors, switch in corner. PCB marked "KGKM B16B-934C-003" http://www.classiccmp.org/acornia/ub/f2.jpg - 2x 50-way connectors. PCB marked "CZGM B16B-9240-001" http://www.classiccmp.org/acornia/ub/f3.jpg - 2 x 50-way connectors, 1x 60W, 1x 26W. PCB marked "CZFM B16B-9230-0010A" http://www.classiccmp.org/acornia/ub/f4.jpg - 2 x 50-way connectors, 1x 60W, 1x 26W. PCB marked "KGFMU B16B-9830-0010A" __Cipher boards:__ There are two of these: http://www.classiccmp.org/acornia/ub/c1.jpg I suspect they're from some form of terminal (or maybe printer?), and now that they're separated from the rest of the system they're just junk. Note that someone seems to have scavenged a bunch of power transistors (or something) from them. __Emulex boards:__ I don't think any of these are the exact same models as the ones I rescued a little while ago, so I've included them here - but gut feeling is that they're still just tape (i.e. not SCSI) and so they're not worth the trouble. http://www.classiccmp.org/acornia/ub/e1.jpg - 2x50W, 1x?? (I forgot to make a note). CU0210402 on the PCB, CS0110202 on the "main" IC. http://www.classiccmp.org/acornia/ub/e2.jpg - 2x50W. TC0210201 on the "main" IC. There were a couple of others too each with a 60-way and pair of 26-way connectors; I suspect those are SMD. Chances are good I'll end up rescuing the DEC Mxxxx boards on Tuesday "just in case", but if anything else stands out then please shout; gut feeling is that they're PCBs from things that would have been quite wonderful once when complete but are now completely useless to anyone. cheers Jules

7 years, 8 months

Components available

by vintagecomputer＠bettercomputing.net

I'm all over stuff like that.. especially with my TVT project. ?It has been a real slog finding correct looking vintage caps in particular. ?I wish I lived nearby! Sent from my Samsung device -------- Original message -------- From: Tom Gardner <t.gardner at computer.org> Date: 2016-09-06 4:18 PM (GMT-08:00) To: cctalk at classiccmp.org Subject: Components available Hi A friend of mine died recently; he was amongst many things an electronics tinkerer and has a closet full of small parts in bin cabinets (resistors, capacitors, ICs, transistors, hardware, etc.).? The ICs look mostly old. His wife and kids have no interest and would like to find a good home for these parts rather than recycle the lot. They are in Palo Alto CA Anyone interested in using them could just pick them up in the next week or so. Any other ideas?? Really hate to see these go to recycle. Tom (650) 941-5324 <tel:%28650%29%20941-5324>

7 years, 8 months

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test-drb September 2016