On un, 20 Feb 2011 17:13:54 -0800, Eric Smith <eric at brouhaha.com> wrote:
[...]
> Digikey has a $25 minimum order.
Digikey killed their minimum some time ago. To quote from their "Digi-Key Web Site Terms of Use and Conditions of Order" <http://dkc1.digikey.com/us/en/mkt/Terms.html?WT.z_ref_page_id=sitemap_quant…> " 7. Handling Charge. There is no minimum order or handling fee."
However, where something like the socket could be shipped US Mail for under a dollar, they stick the item in a box and UPS it for over US$ 6...
CRC
This may seem off-topic at first, but I realize that folks here do
SMPSU repair a lot. My thought was that it might be applicable,
since they're basically the same thing--the ballast runs the lamps
with a 30-40KHz AC voltage.
I've been going over a small stack of failed T8 bulb solid-state
fluorescent lamp ballasts from about the mid 90's. They all have the
same failure and it suprised me.
There's a 2W 0.33 ohm carbon film resistor used as a current sensing
element. In all failure cases, the resistor has failed open, with no
signs of burning, but rather the outer paint flaking off.
To me, this is a puzzle. At 120v, the current through an 0.33 ohm
resistance in series with a 64W load is about half an amp. I2R gives
less than a tenth of a watt power dissipation across the resistor.
(There's also a 2A fuse in series with the whole circuit).
I replaced the failed resistors with 5W composition ones of the same
value, and they seem to work okay.
But the original failure has left me scratching my head. Does anyone
have an insight on this type of failure?
--Chuck
I don't know if this is totally off base for this list. If so I apologise.
Anyway, it is "related to classic computers" (just) somehow.
I have the following books available for the cost of postage:
Oracle8i DBA Bible, with CD. IDG Books 2000, 1115 pages
Oracle8.0.4 for Windows NT: Getting started
Oracle7.3.4 Server for Windows NT: Getting started
Oracle Designer/2000 Rel. 2.1 installation guide
Oracle Network Products 2.3.4/Windows installation guide
Oracle Net8 rel 8 for Windows NT, 95: Getting started
They are in decent condition. The last one has some coffee stains.
I live in Sweden/Gothenburg.
Jonas
Working on my 701c Thinkpad I destroyed an 18 pin DIP socket (surface mount) that connects the modem card to the main motherboard. Anybody have something like this or know where to get one (checked ebay)? All the pads are still intact so soldering in another one will not be a problem.
it doesn't have to work even. Just in good shape. Keyboard and monitor not needed either. Heck even an empty case would work. The expansion box would too in fact!
I have an ASR 43 teletype machine (though you could arguably call it a
"classic" teletype as it uses a dot matrix print head and lacks that classic
teletype sound) and I'm looking for the matching paper tape punch/reader
that was made for it. There isn't much information about it online but the
model for it is M42, M43, M4350, or something similar. It looks like a
sophisticated Dust Buster.
http://www.baudot.net/teletype/pics/M43-Paper-Tape-Unit-1.jpg
What are the chances anyone might happen to have one squirreled away? I want
to try a couple programs on my PDP and print out some test tapes for a
reader built for a TRS-80 model 1.
John
Anyone familiar w/this unit? The power switch in the back won't stay engaged (you press, and it clicks, and power comes on, but it pops back out, and monitor shuts off). I imagine there's probably a part # on the switch, but I forgot to look this afternoon. Asked in case anyone's familiar w/it.
Hi guys,
Does anyone have a HP 16500B logic analyser with a 16500L LAN card
installed?
The EEPROM on my card seems to have been hosed, and now the analyser is
refusing to boot, instead opting to display the message "Corrupted LAN
Board! LAN not functional".
The chip is a Samsung KM28C16, PLCC packaged, sitting next to the I/O
connector on the LAN card.
If anyone has an EPROM programmer kicking around, I could really use a
dump of a known-good EEPROM, or alternatively a replacement 16500H or
16500L LAN card if someone has one in a parts-mule 16500A or 16500B
mainframe.
Thanks,
--
Phil.
classiccmp at philpem.me.uk
http://www.philpem.me.uk/
A few of you might have noticed some recent problems with the classiccmp server ;)
The machine has six 300gb hard drives. Two are PATA, and set up as a mirror that contains just the OS and mailing list. The remaining four are sata and set up as a zfs raidz pool.
One of the two drives in the OS mirror failed. That did not cause downtime of course, but I noticed it when the other failure occured.
One of the drives in the raidz set (websites, user data, etc.) also failed. Because it's raidz, that shouldn't have caused a problem. However, it marked the raidz set as failed and wouldn't mount it, saying there was not enough drives left in the set. I can only guess this was a bug in zfs on that system.
Thanks to hard work from Ryan, the machine is back up. Basically he pulled dd images of the remaining drives in the zfs set, imported them into zfs on one of his machines and the data re-appeared. A two drive mirror was set up on the remaining working drives and then all the data copied back. This took a few days due to the volume of data and network links. I thought that was the end of the problems. But no......
Once the machine was back up, someone said websites were up but no mailing list (I had verified that it was back up after the data re-import). Checking again, now the last drive in the OS mirror is having read errors and is probably going to fail soon. No other systems in our datacenter are having issues like this, so I suspect it's not power related.
Long story short, the machine is back up, all website/user data is restored, and there's no loss of data. However, I can't be sure it will stay up with an OS hard drive mirror set where one drive is dead and the remaining drive is having lots of read errors.
My plan is to go buy six new sata drives for the server, probably 1tb's, plus a 4 port sata controller. I'd prefer to buy the drives new rather than take drives as donations just due to the above issues and time constraints. I found some seagate sata3 1tb 32mb cache drives for $60 each plus tax. Adaptec 1420sa controller is about $90, so the total is about $450. If anyone cares to donate to help cover the purchase, paypal jwest at classiccmp.org
Now I just have to find another machine to move the list & web content off to, rebuild the classiccmp server, and move everything back :)
Jay
