test-drb November 2007

test-drb@ccmp.vtda.org

229 participants
508 discussions

by mikelee＠tdh.com

I just received an old-ish (1990) Toshiba T1000LE laptop and it wouldn't boot, so I took a look at the hard drive and there seems to be some type of goo oozing out of it. It's a Conner hard drive, nothing too abnormal. I didn't think a hard drive contained anything that could ooze out. Any idea what it could be and does that mean the drive is pretty much toast? Let the magic goo out?

16 years, 4 months

these RTL or what?

by ajp166＠bellatlantic.net

> >Subject: Re: these RTL or what? > From: "Roy J. Tellason" <rtellason at verizon.net> > Date: Thu, 04 Oct 2007 01:38:08 -0400 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On Tuesday 02 October 2007 09:56, Allison wrote: >> >Subject: these RTL or what? >> > From: "Roy J. Tellason" <rtellason at verizon.net> >> > Date: Tue, 02 Oct 2007 02:01:29 -0400 >> > To: "General Discussion: On-Topic and Off-Topic Posts" >> > <cctalk at classiccmp.org> >> > >> >I ran across some data in the pile of what I've been collecting, and >> > there's some stuff there apparently by Signetics (?) referring to what >> > they're calling "Utilogic II" -- is this stuff RTL or what? It doesn't >> > say. Dates are in the late 1960s, and it looks like it, but I figured >> > I'd ask in here... >> >> There are many early families of saturated logic RTL is the oldest, > >Which explains why I was seeing it first, and hobby-type projects based on it >back when. The big thing of DTL was to add diodes to the input of the basic RTL structure for increased (noise immunity) input thresholds for better noise immunity. Both families were easily wired OR and systems built around it usually exploited that feature. >> DTL and it's kin "utilogic" where the intermediate sorta TTL like >> and later TTL( H,LS,S,F,AS,C,HC,HCT flavors). > >My first TTL book (which I still have) was a TI book that covered the >standard, H, and L varieties. LS and S I can understand, F and AS still >confuse me a bit, I'm not quite sure where they fit in. Then there are all >those CMOS variants. C parts are pretty uncommon these days, and I'm not >real clear on the distinction between HC and AC (I know about the ones with T >in there, just shifted thresholds on the inputs and I have a pile of 'em.) > >> In the middle of all that was ECL (also about three or four generations) a >> fast non saturating logic. > >I've read some ECL data, but have never done a darn thing with it, nor even >seen much of anything that used it. From what I understand it had some weird >packaging sometimes, very tight board layout requirements (I was mostly >thinking of wire-wrapping stuff), and was very power-hungry. I guess if I >ever want a prescaler for a counter to get *way* up there or maybe one or two >other apps I can think of I might eventually have to go there, depending on >what parts I can find. But I'm in no hurry. :-) VAX9000 built of ECL100K, fastest of the fast. The second most common use of TTL was in very high speed instrumentation and specifically frequency counters and UHF PLLs. >> What amazing is when people say "60s" you must do so with care as >> 1960 was basically germainium transistors but by 1964 silicon >> transistors are about and ICs were already appearing. Most >> integrated circuit logic was post '65 and even then from that >> point speeds went from about 3mhz to 30mhz and RTL was replaced >> by TTL by 1970. > >I did say "late 1960s" up there. :-) Even then.. ;) It's hard to imagine the rate of change. An example, Apollo Guidance Computer. The AGC was designed too be built of RTL, by time it actually flew to the moon is was actually a generation behind as TTL existed by then. Of course that really was becase of development time being so long and space systems having to be man rated (reliability assured). It was a case then of if it was out the door likely a whole new generation and technology was already in design. Where commercial computers went from transistors (1965ish PDP-5) to DTL and early TTL (1967ish PDP-8) in that same time window. Computer design and packaging underwent significant change and not all of it was grossly obvious. >> The evoloutionary scale was very steep from the mid 50s to the mid 70s. >> That 20 years window we went from computers with tubes to microprocessors, >> delays lines or other serial storage to semiconductor RAM. > >I remember seeing some of the boards from the tube stuff for sale in various >electronic junk places around. I may have even got one or two for parts, >though there was nothing to be done with those backplane connectors. I >remember one set of 9-pin sockets for which it was apparent to me that they >were using something like a 12AU7, because of the center-tapped heater >connections. :-) Yep, back then those were good sources of parts for building radios. Most however were noncomputer pulled from things like old instruments and the like. Allison

16 years, 4 months

VAX 11/750 power supply fault

by technobug＠comcast.net

On Thu, 29 Nov 2007 12:02:05 -0700, J Blaser <oldcpu2 at rogerwilco.org>wrote: > In fact, a > couple of the PS PCBs went through the dishwasher to clean up the > remains to 'rodent residue'. On the whole, it seems that I got them > back together properly! ;) If there are any potentiometers on the boards that you washed, you might want to ensure that the wipers are making contact. Generally, pots are installed after a board wash unless they are sealed. An open wiper will cause many of the symptoms you are describing. An easy method is to measure the resistance across the pot and then the resistance from each leg to the wiper. The sum of the wiper to legs should equal the resistance across the pot. If the wiper appears to be disconnected, mark its position and then rotate the wiper through its travel and then back to the mark. If this fails to restore contact or the wiper contact is intermittent, replace the pot - it's not worth the effort trying to save a failing potentiometer. CRC

16 years, 4 months

VT100 Character ROM image

by derschjo＠msu.edu

Anyone out there have a dump of the VT100 character ROM? (This is the ROM located at E4 on the VT100 PCB, labeled as 23-018E2-00) Over the upcoming holiday break I'm planning to work on my VT100 emulator (that is, an emulation of the VT100 hardware) when I'm not spending time with the folks; I have all the other ROM images but I'm missing this one. Thanks! Josh

16 years, 4 months

Bought a 4GB USB stick today, and guess what...

by jos.mar＠bluewin.ch

.. the ( single) flash chip in it is a "HY27UV08" Either someone at Hynix has a sense of humour, or they have run right out of IC codes and have come full circle to 2708 again. Jos

16 years, 5 months

Amiga 1000

by chrism3667＠yahoo.com

does anyone operate one of these? That is does anyone favor this machine over any of the later models? Commercially ISTR it being a flop, so that might seem like a strange question, but there is no lack of strange birds on this list. If you know what I mean LOL LOL! Hey maybe I'm stranger then the rest of you birds LOL LOL LOL! anyhow interested in the thoughts that find this unit particularly enjoyable. ____________________________________________________________________________________ Be a better sports nut! Let your teams follow you with Yahoo Mobile. Try it now. http://mobile.yahoo.com/sports;_ylt=At9_qDKvtAbMuh1G1SQtBI7ntAcJ

16 years, 5 months

How easy is it to damage an IBM CGA display?

by mbbrutman-cctalk＠brutman.com

I'm having a bad day here .. I mistook an IBM Industrial CGA display for a monochrome display, and plugged it into a monochrome display adapter port. There was no smoke or funny noises, but it definitely did not work. I've heard stories about the IBM monochrome displays being fragile when mishandled like this. Were the IBM CGA displays also this fragile? (I won't be able to test it until I dig out a CGA card. And now of course I'm just paranoid and hoping that I didn't hurt it.) Mike

16 years, 5 months

DoveBid Phoenix, AZ (4x) PDP 11/04 $1700, Ends Thursday 11/29/07 10:36 AM PST

by glen.slick＠gmail.com

http://www.dovebid.com/assets/display.asp?ItemID=swp1466 DEC MODEL PDP11/04 COMPUTER 4 EACH Ends Thursday 11/29/07 10:36 AM PST Phoenix, AZ Opening Bid: US$ 1,700.00 BIN: $ 2,700.00 More than I would want to pay, but someone might want these....

16 years, 5 months

New thread - Unwanted / Available parts

by mike＠brickfieldspark.org

I'd recently come across a few Ic's that I have spare and rather than bin them would prefer to pass them on. Next idea was what about a central point for members/people to look and see who has what. So I came up with this -> www.soemtron.org/partsavailable/index.html <- its an idea, would it be usefull ?, or not. There are possibly better ways. Comments please, I'd be happy to run it, but am also prepared to be shot down in flames if it already exists or is not wanted. The emails on those pages are live. Many thanks, Mike

16 years, 5 months

Does anyone have an EagleCAD library with the TIL-311 hex display?

by ethan.dicks＠usap.gov

Hi, all, I am starting a new project and was disappointed to find that the default EagleCAD libraries don't have the TIL-311 hex display already entered (or at least not that I can find). If anyone happens to have that part in a library already, it would save me entering it in. Also... if you've read this far, does anyone know off the top of their head what the TIL part number is for the *decimal* version of the TIL-311 as well as any version with an embedded counter (TIL-307? TIL-309?) I remember these parts were discussed on the list sometime back, but the specific part numbers escape me at the moment. I know I can get TIL-311s new for about $15 each, and NOS and pulls for $2-$3 each. I'm curious about the other versions in the hopes that with lower demand comes lower prices on the used market. I have enough TIL-311s on hand to do what I want, but that doesn't leave me many spares. Thanks, -ethan -- Ethan Dicks, A-333-S Current South Pole Weather at 25-Nov-2007 at 03:00 Z South Pole Station PSC 468 Box 400 Temp -32.6 F (-35.9 C) Windchill -32.6 F (-35.9 C) APO AP 96598 Wind 0.0 kts Grid 171 Barometer 678.8 mb (10674 ft) Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html

16 years, 5 months

← Newer
1
2
3
4
5
6
7
8
...
51
Older →

Jump to page:

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb November 2007