test-drb December 2008

test-drb@ccmp.vtda.org

209 participants
286 discussions

Any interest in a build-it-yourself votrax synthesizer kit?

by jzg22＠drexel.edu

If offered for $300 would anyone be interested in a kit to build a discrete resistor/capacitor/analog implementation of a Votrax synthesizer/vocal tract? Most of the digital parts would be done using a PIC. Would be mostly SC-01 compatible with possible RS-232 phoneme entry and optional text to speech. Please respond off-list if you're interested, if enough people show interest we may offer it. The price is not final. -- Jonathan Gevaryahu jgevaryahu(@t)hotmail(d0t)com jzg22(@t)drexel(d0t)edu

15 years, 4 months

Ebay: "new" 029 Keypunch

by silent700＠gmail.com

Either new or very new-looking. Not mine, don't know the seller, etc: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280297753368 \

15 years, 4 months

RSTS/E question and media.

by andrew＠smokebelch.org

So I finally got the Micro PDP11/53 hooked-up to a terminal. When back at the folks at over Christmas I found an old MMJ cable and DB25F adapter, which work when the latter is plugged into the VT. I need to try the MMJ cable I bought recently with this adapter, but suspect it is something about using an MMJ direct between the PDP and VT. ISTR having this problem before trying to direct cable a MicroVAX to a VT's MMJ port. In any case, I'd like to join this machine into Hecnet, hope to run RSTS/E and have a couple of questions: - Looks like only v7 of RSTS/E is available, would this suffice? - Would anyone be willing to help me out with media (happy to cover cost for media and postage, of course)? Regards, Andrew -- Andrew Back a at smokebelch.org

15 years, 4 months

Free for Shipping: SyQuest EZFlyer, EZDrive

by martinm＠allwest.net

The items are claimed. Thank you, Martin Marshall > -----Original Message----- > From: Martin Marshall [mailto:martinm at allwest.net] > Sent: Tuesday, December 30, 2008 9:56 PM > To: General Discussion: On-Topic and Off-Topic Posts; The Rescue List > Subject: Free for Shipping: SyQuest EZFlyer, EZDrive > > > More from the cleanup: > > One = SyQuest EZFlyer 230 MB Drive - Parallel Port - Original > box - complete > > One = SyQuest EZDrive 135 MB Drive - SCSI External - Shrink-wrapped > > Free for shipping from 82930. Reply off-list to "martinm" at > the domain "allwest.net". > > Thank you, > Martin Marshall >

15 years, 4 months

What kind of IC is this

by technobug＠comcast.net

On 1 Dec 2008 10:54:43 -0200, Alexandre Souza wrote: > Of course, you can always use a 2716 or like EPROM on the place > of PROMs > :o) Actually not... A fast 2716 has an access time of 200 nsec whereas TTL PROMs have sub 100 nsec access times (e.g. 82S115 = 60nsec max). At the time, TTL PROMs were used where access speed was necessary. To replace them with an EPROM or EEPROM you have to go to something much more current. CRC

15 years, 4 months

Ebay: "new" 029 Keypunch

by jrkeys＠jrkeys.cnc.net

---- General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> wrote: > > > Really? Reaction on this list to the original govliq lot seemed to > > indicate otherwise. I don't know how often they come up on ebay > > because I don't have an active search looking for them. > > Most I see are not on Ebay. In the past couple of years, I have come > across maybe six 029 and 129 machines _off_ Ebay, then there are the > ones that we see _on_ Ebay. 029s and 129s seem to be neck and neck as > far as availability. Other keystations, like the 024 and 026 are not. > Then there are some weird variants, generally part of data comm sets, > that really are rare. But then, often the difference is only a hair > more than a new tag. > > > Still, considering that someone snatched that one up with a buy-it-now > > option instead of waiting out the auction tells me that they aren't > > common on ebay either. > > Lots of people, including some of the mainframe collectors (big guns), > still think that the 029s and 129s are really rare. I suspect they are > not looking past their screens. For those of us that are actually > doing the legwork, the things just come around. > > > While rare is a relative and not an absolute term, I don't think this > > sort of item (particularly in this condition) would qualify as common. > > Yes, the condition matters greatly in this example. I will admit that. > > -- > Will > I have found none here in Texas but have found several outside of Texas both in CO & GA. Picked up some 024's and other loder devices. John K

15 years, 4 months

Why it is sometimes necessary to re-seat a board or chip

by sellam＠vintagetech.com

I was perusing some topics on Wikipedia and came across this enlightening tidbit of information in the article on "Gold plating": "With direct gold-on-copper plating, the copper atoms tend to diffuse through the gold layer, causing tarnishing of its surface and formation of an oxide and/or sulfide layer. "A layer of a suitable barrier metal, usually nickel, is usually deposited on the copper substrate before the gold plating. The layer of nickel provides mechanical backing for the gold layer, improving its wear resistance. It also reduces the impact of pores present in the gold layer." http://en.wikipedia.org/wiki/Gold_plating So this is why a re-seating of certain cards, connectors and ICs oftentimes cures a fidgety system. Just thought I'd share this. It was novel to me at least. P.S. I'm assuming this information is accurate :) -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

15 years, 4 months

Free items, West Yorkshire.

by austin＠ozpass.co.uk

Hello! Having a New-Years clearout before my son/daughter arrives. Free for collection: SGI 20" Monitor (including little slide-out remote control) Digital (DEC) 17" Monitor (originally used with a VAXstation) Generic (beige) 19" Monitor with BNC inputs (used for my SGI Crimson) Sun PowerMac G4 (sawtooth) X 2 Sun SparcStation 4 Sun SparcStation 5 (bad cosmetic condition - missing front "feet") Sun SparcStation 2 Sun ULTRA 1 Sun ULTRA Enterprise 2 Xemplar Power Macintosh ONE/225 HP Deskjet 1220C Ideally I'd like to get rid of it all in one go, but I appreciate this is somewhat optimistic! I can provide further information on any of the kit, upon request. All replies directly to myself, please. I'm based in Holmfirth. Happy New Year! -Austin.

15 years, 4 months

What kind of IC is this

by technobug＠comcast.net

On 30 Dec 2008 13:59:20 -0800, Chuck Guzis wrote: > Do fusible-link PROMs go bad? At least do they go bad any more often > than some of the LSI on that board? [...] Indeed they do. Six months ago I was given a DOA Rockland-Wavetek 5820B spectrum analyzer that had a disconnected power supply lead. Fixing that brought up the unit sans random pixels on the displayed alpha-numerics. I finally traced the problem to a 8S115 PROM that was feeding a 8X300 (two other CPUs in the beast - Z80s). After decoding the ROM I began editing the data to restore the missing 1-bits and reprogrammed the very same chip. After the first half of the alphabet, the remainder of the letters magically appeared. Once the bit "heals" it is possible to reblow it. How long this fix is going to last is anyones guess - probably another 20 years... CRC

15 years, 4 months

Free for Shipping: SyQuest EZFlyer, EZDrive

by martinm＠allwest.net

More from the cleanup: One = SyQuest EZFlyer 230 MB Drive - Parallel Port - Original box - complete One = SyQuest EZDrive 135 MB Drive - SCSI External - Shrink-wrapped Free for shipping from 82930. Reply off-list to "martinm" at the domain "allwest.net". Thank you, Martin Marshall

15 years, 4 months

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test-drb December 2008