test-drb March 2005

test-drb@ccmp.vtda.org

291 participants
840 discussions

program to print out ASCII renderings of punch cards and/or papertape?

by ethan.dicks＠gmail.com

I've been wracking my brains and googling for most of an hour... ISTR there _used_ to be a program that shipped with UNIX (at least BSD-flavors, if nothing else) that could take a string as a command line arg, and print either a punch card image or papertape renderings to stdout. Does anyone remember the _name_ of this program? Thanks, -ethan

19 years

OT: new info on fuse

by fernande＠internet1.net

Just got back from Radio Shack. I bought a fast blowing 250v 2 amp fuse and installed on in the laserdisc player. Unfortunetly, it blows just as fast as the .75amp fuse. So.... that means I have a dead short somewhere, right? How do I go about checking that? Chad Fernandez Michigan, USA

19 years

Xerox 820-II

by aserlanger＠earthlink.net

Looking around desperately for cp/m disks for the Xerox 820-II. If anyone has these to share or for sale I'd be very grateful. Thanks, Andy Erlanger

19 years

10base5 (Thick) Terminator ?

by birs23＠zeelandnet.nl

This is probably gonna be a really easy question for you guys; is this http://www.mansier.net/10base5terminator.jpg a 10base5 (thick ethernet) terminator ? Thanks! Stefan. ------------------------------------------------------- http://www.mansier.net

19 years

10base5 (Thick) Terminator ?

by pete＠dunnington.u-net.com

On Apr 1 2005, 0:11, Jochen Kunz wrote: > On Thu, 31 Mar 2005 14:38:07 -0600 > AFAIK thick Ethernet cable is more or less RG213. Typical values are 8 > dB / 100 m attenuation at 150 MHz and 15 dB / 100 m at 450 MHz and a > velocity factor of 0.66. Too slow. The velocity factor for thick Ethernet is supposed to be around 0.78. You can use RG213 or even RG8 but the maximum size of your network would be slightly shorter, to allow for slightly longer round-trip delays. > Ahh, and keep in mind that these cables usually are not UV resistent, so > sun light will destroy the outer jacket! Cover the cable if used > outside to avoid direct sun light. I believe you can (could) get plenum-rated cable that has a Teflon outer instead of PVC. Teflon is resistant to UV. -- Pete Peter Turnbull Network Manager University of York

19 years

10base5 (Thick) Terminator ?

by James＠jdfogg.com

> Subject: 10base5 (Thick) Terminator ? > > This is probably gonna be a really easy question for you > guys; is this http://www.mansier.net/10base5terminator.jpg a > 10base5 (thick ethernet) terminator ? This is an "N" type connector. I thought 10base5 used PL259's (single unshielded pin in the center, screw shell).

19 years

10base5 (Thick) Terminator ?

by pete＠dunnington.u-net.com

On Mar 31 2005, 14:38, Tom Peters wrote: > It was (is-- I still have a spool of it!) 50 ohm coax with N connectors, > and paint marks at every meter boundary. You had to terminate each run of > thicknet end each end (that's two ends, for those who are counting). > > You had to tap it with a vampire tap ONLY ON THE 1 METER MARKS using a tap > drill tool that would core into the shield and expose the center conductor. Actually, every 2.5m, not every meter. > I'm still looking for specs on thicknet cable-- I know the characteristic > impedance is 50 ohms, but if I knew the velocity factor and losses at VHF > (144 - 148 mhz) and UHF (430 - 450 MHz) I could use the stuff for my > amateur radio hobby. As it is, it's gathering dust. It varies very slightly from maker to maker and even batch to batch, so if it's that critical you'll need to measure it. Indirectly, the 802.3 standard says 0.78; my tables show Belden 9880 VF is 0.78-0.82, attn 1.3dB/ft @ 100MHz, 2.8dB/ft @ 400Mz, 4.5dB/ft @ 1GHz. Sometimes people use RG-8, though, which has VF 0.66, and higher losses. Surely 144-148 millihertz is VLF, not VHF? -- Pete Peter Turnbull Network Manager University of York

19 years

10base5 (Thick) Terminator ?

by pete＠dunnington.u-net.com

On Mar 31 2005, 12:01, David H. Barr wrote: > On Thu, 31 Mar 2005 19:47:04 +0200, Stefan <birs23 at zeelandnet.nl> wrote: > > This is probably gonna be a really easy question for you guys; is this > > http://www.mansier.net/10base5terminator.jpg a 10base5 (thick ethernet) > > terminator ? > > Err, wasn't thicknet (DIX) the one with DB-15 / AUI transcievers, > vampire clamps, and so forth? To be picky, DIX != thick Ethernet, or more exactly DIX != 10base5. 10base5 uses thick coax but it works slightly differently to DIX. Yes, they use AUI cables and transceivers with a DA15 connector with that horrible slidelock, and they use vampire clamps on some of the taps (last time I fitted one was for a demo two weeks ago), but the "Ethernet" cable is the thick coax, with N connectors. > PS: That connector looks odd to me. My coax net has BNC T's on it and > a reflector on the end. Maybe we're not talking about the same > things? You mean a terminator. And the BNCs are thinnet, aka cheapernet, 10base2. Same speed as 10base5, but shorter (185m per segment instead of 500m), and with fewer allowed active connections per segment, and different rules about spacing the taps, which are BNC T-pieces. If Stefan's N connector has a 50-ohm resistor in it, it's a 10base5 terminator. -- Pete Peter Turnbull Network Manager University of York

19 years

AS/400 P03 Questions

by phirkel＠sympatico.ca

Hi folks. I recently acquired an AS/400 P03 "Advanced Portable." This is my first real piece of IBM Midrange hardware, and I have not a clue how to interface with it. I know the OS is a PITA on its own to deal with, but I figure I'll solve one problem at a time. So, I was just wondering, does anybody have any manuals for this sucker (preferably in PDF form!) or know where I can grab them from? There is not a sign of the English manuals for this machine on IBM's website at all. Also, I was wondering if anybody knew how I would go about interfacing with this machine. The DE9 ports on the back of it are definitely not serial ports, and the only other port on it is a SCSI port. Am I missing some cards for this machine? It would almost appear as though the original owner pulled some interface cards for it, but I could be mistaken. Any help would be appreciated! Phil.

19 years

Century Data Systems T-50 disks

by pat＠computer-refuge.org

So, I picked up a bunch (5) of Century Data T-50s, (also labelled as "Diva" disk systems), which seem to be multi-platter 54.7MB removable 14" disk-pack drives. Of course, I didn't get any of the disk packs to go with them. My questions are: 1) Does anyone have any available disk packs, or know if they're interchangable with something else that is availble? 2) Does anyone want (some of) them? I don't want to give them up for nothing, but I'm not looking to get too much out of them, and I'd rather give them to someone who finds them useful than let them sit around, especially since I don't have any disk packs (yet). The drives are 150-200lbs each, and are rated at 4A at 208-240V (60Hz IIRC). There's a detailed manual on bitsavers about them: http://computer-refuge.org/bitsavers/centuryData/76205-902_tridentSpec_Nov8… I also have the T2000 disk excerciser and T2001 head alignment boxes for the drives. I have no idea if any of this works; it was probably in storage for 10+ years, and the drives date back to about 1980. Pat -- Purdue University Research Computing --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org

19 years

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test-drb March 2005