test-drb May 2006

test-drb@ccmp.vtda.org

195 participants
346 discussions

OT(ish): Using "Classic" CPU as power resistor...

by zmerch-cctalk＠30below.com

Rumor has it that Brian L. Stuart may have mentioned these words: > > From: Roger Merchberger <zmerch-cctalk at 30below.com> > > The problem is I need to use a PC power supply (AT-class with it's own > > power switch) as a 12V power source, and the only one I have access to > > needs a minimum load of 3Amp on the +5Volt line. > >How about a light bulb? I was thinking of that (and was also suggested by a cow-orker) but I was unsure about how to handle the function of variable resistance WRT heat dissipation; and also, if a bulb fails, it fails open-circuit which means there's no more voltage regulation. I suppose with enough bulbs, one could build enough redundancy into the system... I may hit an auto-parts store tomorrow anyway and see what I can scare up; but having ready access to several CPUs (2 each 80486SX's & a P75 Overdrive on a quick search) I figured that a 5V CPU would be a good way to dissipate power from a 5V source, and the 486 would prolly have the highest current draw of any easily available 5V processor. But again, I could very well be wrong... No, I'm *not* using any of my 6809s!!! ;-) Thanks! Roger "Merch" Merchberger -- Roger "Merch" Merchberger | "Bugs of a feather flock together." sysadmin, Iceberg Computers | Russell Nelson zmerch at 30below.com |

18 years, 2 months

Shure AMS8000 mixer.

by bryan＠museresearch.com

Actually, I don't think that it is suspicious at all. If you search for AMS8000 on Yahoo, you come up with this thread. There are a lot of these mixers out there and a lot of missing manuals! I too am looking for tech information on the AMS8000 as I just bought one at a flea market! B

18 years, 2 months

Stewpit Indy questions <:-/

by compoobah＠valleyimplants.com

> I do remember running across some a while back that were marked "IBM" and had >a pinout that was different enough from the usual kind that they would not >work in most equipment that they were tried in. Is that what those were? Possiby RS/6000 SIMMS? these are 72-pin (x40? bit) SIMMS with a not-quite-so-deep cut on the one side. I found one non-IBM that would tolerate them (had 1/2 of a bank of 16MB ones, a bank on a RS/6k POWER2 being 16 SIMMS)

18 years, 2 months

Stewpit Indy questions <:-/

by pete＠dunnington.plus.com

On May 12 2006, 19:07, Gerhard Lenerz wrote: > Friday, May 12, 2006, 9:27:39 AM, you wrote: > > > I have a FDDI board in my Indy to get nice and fast 100 MBit/s > > network... > > I've got one of these in my Challenge S and two more for my Indigo 2s. > But alas, I currently don't have the appropriate cabling on the > external side complete. I've got single-attached ones in two Indys and dual-attached in my Origin2000 and also a Newbridge ATM-FDDI bridge. You can also get dual-attached interfaces for Indys but I've never seen one :-( I do have the cables, though. > > As we are talking of Indys: What is the max. SIMM size for the Indy? > > 32MB. I think there won't be a trick as there is with R10K Indivo 2s. Yes, that's right. I have 256MB total (8 x 32MB) in two of mine, and I know of someone who bought 64MB SIMMs and was told by SGI that the reason his Indy wouldn't work was that it won't recognise anything that big. -- Pete Peter Turnbull Network Manager University of York

18 years, 2 months

OT(ish): Using "Classic" CPU as power resistor...

by zmerch-cctalk＠30below.com

I need some help from those who are a lot better than I in hardware design... The problem is I need to use a PC power supply (AT-class with it's own power switch) as a 12V power source, and the only one I have access to needs a minimum load of 3Amp on the +5Volt line. By my rough calculations and allowing for wiggle room, I'd need a 20-watt power resistor of 1.5 ohms to keep the critter happy. "Bare minimum" is 15W, and I could squeak by with that if I wire the fan to the 5V line instead of the 12V... but even when I'm expected to perform a "miracle" I like to have a little wiggle-room. ;-) Problems I have are: 1) I need this by Monday, and 2) I don't keep 20-watt power resistors in my back pocket. Had I a week, I'd just order the right tool for the job - I don't have that luxury. ;-) I was thinking I *might* be able to cobble up enough lower-end power resistors & figure out how to stuff 'em together to draw 15w+ of power, but then I thought: What if I took an older 5V CPU (say... an 80486) and wired 'er up to just Vcc & Ground - how much power would that use? [[ I've started some google searches & I will continue, but I was hoping others here would have better ideas than my lame-azz neurons & google so far ]] I could also wire-wrap all the address/data lines to Vcc if that would add a enough extra current draw to make 'er worth my while... For those who are in lust with the "older, but still plentiful" CPUs like that, then turn away now, you didn't see this, I was never here." ;-) Any ideas will be most appreciated! Thanks! Roger "Merch" Merchberger

18 years, 2 months

anyone have a terminal server?

by adamg＠pobox.com

A somewhat belated reply to this thread, as I read the list irregularly... DECserver series: Some models are LAT only (such as 100, 200, 90), some also talk TCP/IP. Note there is also a TCP capable version of the 90 called the 90TL. I believe there's an open source LAT daemon now. The 90 is a compact 8 port module that plugs into the DEChub-90 or DEChub-1. Some of these will need a MOP server to boot. Any of these should be OK to attach terminals to. IIRC, I wasn't able to associate DECserver-100 ports with services for attaching it to a console port ("reverse LAT"), only some models support that. DS550 is a big box with a PDP inside, 90 and 900 are little, 100/200/300 are in between. Lantronix: ETS series terminal servers are compact boxes with varying numbers of ports, with a DECserver-like interface. They can be used as terminal servers as well as console servers. EPS series devices are intended as print servers -- IIRC you can use as console servers, but not as terminal servers, because the commands for outgoing connections are gone. There's also the LRS series, which were intended as small RAS boxes, but will also be OK as console or terminal servers -- but the LRS2 hardware seems to have problems. The LRS1 is OK. They also have a few other product lines such as MPS. Many of their products talk both TCP and LAT, some of them are TCP-only unless you purchase a LAT license. Some of them can be used as TCP/LAT gateways. Shiva LanRover: Intended as a RAS, can also be used as a console server. 1U rackmount box with up to 8 ports. Probably not useful as a terminal server, unless you have a machine that can talk the Shiva Hose protocol and take over the ports. (It's been a while but I don't believe it wanted to give a login prompt to an attached device that doesn't act like a modem.) They also made an OEM version for IBM. TCP. Xylogics Annex: A few different products, usable as console or terminal servers. Annex 3 squeezes dozens of ports onto one box, with Centronics connectors. Livingston Portmaster: This series was popular with ISPs as a RAS, can also be used as a terminal or console server IIRC. TCP. Bridge Communications CS/100, 3Com CS/2100: Not sure what exactly these will do, but without the boot floppy or TFTP image, they won't do much useful! The software was available in several versions including one that only talked OSI. A dozen or so ports. Xyplex, Emulex, others: Various DECserver workalikes. LAN Access LANAserver: Dunno much about this except it was available with 4 and maybe 8 ports, it's 1U and it has an LCD on the front. Company was sold to Digi in '95, they sold the product to NNTI, NNTI went out of business. I think Digi might have also had their own product. Cyclades: They make some sort of nifty little box with L*n*x inside, I think it's intended as a console server. Cisco: They made a box with a bunch of serial ports, I think it was intended as a RAS but could be used as a console server and maybe a terminal server. Hmm, I know I'm forgetting something here... -- Adam

18 years, 2 months

IBM Token Ring Gear Available in Ontario

by devonstopps＠gmail.com

I've got the following token ring gear available, removed from a working environment a couple of years ago. All is 16/4, and also have some cabling and adapter dongles. Located between Toronto and Kingston, Ontario, Canada. 7x IBM 8228 MAU's # FRU Desc. 1x 92F6959 MCA Token ring adapter 1x 74F9415 MCA Token ring adapter 5x 92F4555 8bit ISA Token ring adapter 1x HV ? ARCNET ver2.0 1989

18 years, 2 months

Stewpit Indy questions <:-/

by compoobah＠valleyimplants.com

Jochen wrote: > As we are talking of Indys: What is the max. SIMM size for the Indy? >I had 8 x 32 MB in mine. I got some 64 MB SIMMs so I threw them into the >Indy to get even more RAM. But the Indy saw only 4 x 16 MB instead of 4 >x 64 MB. The SIMMs worked well in a Indigo2 R10k but showed the same >problem in a Indigo2 R4k. The IP24 (Indy) uses the IP22 (R4K Indigo2) logic set, and carries with it the memory limitations. On an Indigo2, this is 384 MB, but Indy is one bank short. Max is 256. IP28 uses different logic in the memory. It'll take 1GB

18 years, 2 months

Looking for MSJ article

by cclist＠sydex.com

Does anyone have a copy of the September 1984 Microsystems handy? I'm interested in the article about replacing the 8085 on a Compupro dual-CPU board with an NSC800. I'm doing a similar project, but am having some real problems. I can read and execute instructions from EPROM just fine; reads and writes to I/O devices are just ducky, but DRAM access is unpredictable at best. Logic analyzer waveforms look textbook, so I'm wondering what I'm missing. The board does use the Intel 8202 DRAM controller and I know it's a twitchy part, so I'm wondering if there might be a marginal timing issue. Cheers, Chuck

18 years, 2 months

HP 264x terminal deal

by gginben＠cebridge.net

Just wanted you to know that I am the one on ebay with all the old vintage terminals, and keyboards thermal printers, Misc Keyboards, etc. I seen that you were asking about the update so I was just letting you know personally that I am probably fixing to list them for cheaper on ebay, and not go through all the checking and testing. Its just taking up to much of my time, and storage space. Maybe I need to have a garage sale....lol. Now In the auction if it says that its been checked its been checked on what it says. If your interested or have any questions please, just send me an email or offer. Thanks, Greg (Gessman Business Services) *Friday, May 12, 2006, 2:20:43 PM*

18 years, 2 months

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test-drb May 2006