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101090 discussions

Compact QBus Systems (Was re: Los Angeles: Commodore PET 8032's...)

by dburrows＠netpath.net

><The H780 supply is about 3 inches wide IIRC and mounts beside the card cage ><That would make it a couple inches wider than the TU58EX. ><Dan > >More like 5" when you add casing. I have a 780+backplane. > >The Rackmount BA11-M is 3.5h x 19w x 18.5d (the depth is possibly >inaccurate) The destop version is a little larger for prettyness. > >The BA11-VA 3.5h x 13w x 13.5d > >the H780 ps alone 5.5"W3.3hx14.625L > >The BA11M however will take a lot more cards though but is very noisy. I was going my memory of the ones I have had. The last one was 6 to 9 months ago. I will have to keep my eyes open for more. They a handy size. Dan

26 years, 1 month

PDP-11 Emulator Question

by ethan_dicks＠yahoo.com

--- Aaron Christopher Finney <af-list(a)wfi-inc.com> wrote: > I just took a look at the netpliance website for some details... > > If you buy an i-opener online, you have a choice of monthly or fixed-term > service. If you go through the purchase procedure for monthly service, > it's $99 plus $39.95 shipping, with no mention of a minimum required > service length. I'd assume that it's the same at CC; you probably buy the > box there for $99 + tax without the internet service. OK... here's the scoop... my local CC is backordered over a dozen units. I put down a $20 deposit on one and it is supposed to arrive in two weeks. The way the billing works is you pay $99 + tax for the unit and as soon as you connect it to a phone line and give it the go-ahead, the unit connects with the central office somewhere and you enter in credit card info and pick yout billing plan. If you never connect it to a phone line with the default QNX software, you never have to worry about signing up. I expect this policy to change when they see hundreds if not thousands of units sold with no service started on them. Until then, I've (almost) got mine. Now all I need is a DE-620. -ethan ===== Even though my old e-mail address is no longer going to vanish, please note my new public address: erd(a)iname.com The original webpage address is still going away. The permanent home is: http://penguincentral.com/ See http://ohio.voyager.net/ for details. __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com

26 years, 1 month

PDP-11 Emulator Question

by ethan_dicks＠yahoo.com

--- FBA <fauradon(a)mn.mediaone.net> wrote: > What about the USB port? It seems like they are not using it in the iopener > configuration but is it available to other OS's? Possibly, but Linux USB support isn't all it could be. It's probably OK under '98. > Now what is a good source of 2.5" HD's. I've been getting mine used from people that have been upgrading laptops to bigger disks. I have several in the <2Gb range (no... don't ask for one... three of them have Linux/Solaris/WinBlows for my regular laptop). > How about the SanDisk is that a port or is it soldered on board? The picture shows two 64Mb Flash chips soldered down - 128Mb/16MB total. There's a page from the guy who hacked his that shows the output of Linux "dmesg" shows the disks thusly... ide0: BM-DMA at 0xe000-0xe007, BIOS settings: hda:DMA, hdb:DMA hda: TOSHIBA MK2103MAV, ATA DISK drive hdb: SunDisk SDTB-128, ATA DISK drive ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 hda: TOSHIBA MK2103MAV, 2067MB w/128kB Cache, CHS=525/128/63 hdb: SunDisk SDTB-128, 15MB w/1kB Cache, CHS=490/2/32 -ethan ===== Even though my old e-mail address is no longer going to vanish, please note my new public address: erd(a)iname.com The original webpage address is still going away. The permanent home is: http://penguincentral.com/ See http://ohio.voyager.net/ for details. __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com

26 years, 1 month

PDP-11 Emulator Question

by fauradon＠mn.mediaone.net

What about the USB port? It seems like they are not using it in the iopener configuration but is it available to other OS's? If it is then eveything and more can be hooked up: scanner, CD Writer, floppy, mices, printers, joysticks etc... lokk pretty good for the bucks. I'm making a stop on the way home tonight. Now what is a good source of 2.5" HD's. How about the SanDisk is that a port or is it soldered on board?

26 years, 1 month

Red Erasors

by edick＠idcomm.com

The eraser I always saw recommended was a "pink pearl" which was in commonly available supply at any office supply store. I never bought into the notion that the substance I was removing was "corrosion" for the simple reason that the backplane connectors and the PCB's were gold-plated. Since the eraser always left a clean gold plated edge connector, I quickly concluded it was dirt and not corrosion that was accumulating at the interface between PCB and backplane. I found much less of this occurring in clean environments where dust didn't accumulate in the equipment cabinets, so I did what I thought necessary to exclude dust from all the cabinetry, and, guess what! ... There was much less "corrosion" in the cleaner boxes than in the dirty ones. Dust doesn't cause corrosion, does it? It could cause abrasion, but I doubt that's at the root of these problems. My question would have to be, "How do you clean the backplane connectors? Dick > -----Original Message----- From: John Wilson <wilson(a)dbit.dbit.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Monday, March 13, 2000 2:13 AM Subject: Re: Red Erasors >On Mon, Mar 13, 2000 at 12:31:02AM -0800, Marvin wrote: >> Gosh, I didn't realize gold oxidized :). Second, while I also use erasors to >> clean gold fingers, I would fully expect any abrasive material to remove >> some of the gold. How much? Darned if I know. > >Somewhere in the old DEC maintenance fiche there's a discussion about this. >They claimed the amount taken off by an eraser was pretty significant >(something like 1/10 of the plating each time you rub it down with the >eraser, but maybe they were a tad enthusiastic in their tests) and so it >was a really bad idea, they had some vile chemical that they wanted the FS >folks to use instead. > >John Wilson >D Bit

26 years, 1 month

Red Erasors

by edick＠idcomm.com

Please see embedded comments below. Dick -----Original Message----- From: allisonp(a)world.std.com <allisonp(a)world.std.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Monday, March 13, 2000 11:12 AM Subject: Re: Red Erasors >> PCB's were gold-plated. Since the eraser always left a clean gold plated >> edge connector, I quickly concluded it was dirt and not corrosion that was >> accumulating at the interface between PCB and backplane. I found much less >> of this occurring in clean environments where dust didn't accumulate in the > >Actually it can be corrosion. Good gold plated fingers are gold over >nickel over copper and have excellent resistance to wear, corrosion and >metal migration. Many however cheap out and do gold over copper, very >bad. This gold over copper tends to have problems with the copper ions >migrating to the gold surface and turning a bluish-green. Being "chromatically challenged" (can't tell either blue or green from grey or pink) to such extent that the corrosion or dirt was just a dark smudge, I never considered that it might result form low quality boards. Thanks for explaining this. >Attacking that >with abrasives or solvents are temprorary solutions at best ans the >copper ions will continue to migrate. This is why the layer of nickel is >needed to keep the gold clean. This also depends on the connector being >gold/nickle/copper as well or the metal migration happens from the >otherside (connector). Adding to that boards with tin(solder) plated >connectors and you can effectively posion the connector system. My altair >and later replacement WAMCO backplanes suffered this fate from the mixed >plated connectors and boards. It showed up after about two years in the >slightly salty humid LongIsland air, symptoms were boards must be pulled >and plugged back in before the system would run if powered off for more >than a few days. I would have to use goldwipes and M50 solvent every >few weeks to make it only somewhat stable. Even a film of silicone oil >only helped somewhat. > >Oh, add oil vapor (machine shops), tobacco smoke or other pollutants and >the reliability and surface accumulations can be far worse. > > >Allison > >

26 years, 1 month

Red Erasors

by edick＠idcomm.com

Well, leave it to Tony to suggest a practical way to handle an awkward job . . . This one's GOT to work! Dick -----Original Message----- From: Aaron Christopher Finney <af-list(a)wfi-inc.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Monday, March 13, 2000 11:32 AM Subject: Re: Red Erasors > > >On Mon, 13 Mar 2000, Richard Erlacher wrote: > >> My question would have to be, "How do you clean the backplane connectors? > >I think it was Tony who brought up a punch card soaked in alcohol to >clean the backplane connectors. Mildly abrasive, doesn't leave anything >behind. >

26 years, 1 month

The C programming language

by Glenatacme＠aol.com

In a message dated 03/09/2000 3:19:11 PM Eastern Standard Time, Hans.Franke(a)mch20.sbs.de writes: > I wouldn't consider C as anything 'grown'. maybe evolved in the > sense of degeneration. Hey, Hans, I don't get this. C is the most versatile, flexible, and portable language ever devised. It permits complete control of hardware while at the same time allowing elegance in program design and structure. Can ADA match that? Glen Goodwin 0/0

26 years, 1 month

Dayton Computerfest finds

by ethan_dicks＠yahoo.com

--- Pete Turnbull <pete(a)dunnington.u-net.com> wrote: > For a Mac-to-Newton cable, the interconnections are: > > Ground (4) -> Ground (4) (also connect to connectors' shrouds) > Transmit+ (6) -> Receive+ (8) > Transmit- (3) -> Receive- (5) > Receive+ (8) -> Transmit+ (6) > Receive- (5) -> Transmit- (3) > Data Term Ready (1) -> Clear To Send (2) > Clear To Send (2) -> Data Term Ready (1) Bingo! Thanks. -ethan ===== Even though my old e-mail address is no longer going to vanish, please note my new public address: erd(a)iname.com The original webpage address is still going away. The permanent home is: http://penguincentral.com/ See http://ohio.voyager.net/ for details. __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com

26 years, 1 month

Why etc.

by allisonp＠world.std.com

<> 5) Red pencil erasors are excellent for cleaning card edge connectors. < <I was told that red pencil erasers should never be used as they sulfur <compounds, and to use instead a natural gum rubber or white plastic <eraser. None should be used unless extreme measures are required. The gold plating is only 100u and can be rubbed right off. If you wear through the connector gold life will be painful as the connector is now susceptable to green corrosion (copper) and that will be a mess to prevent. Allison

26 years, 1 month

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