test-drb

test-drb@ccmp.vtda.org

101090 discussions

by allisonp＠world.std.com

< Do you have to stop it before it goes through the dry cycle? On mine I can set it for a low energy dry so that varies. I'd suggest letting it start and after five minutes pull it out (warm board will dry faster). < I have a '64 I don't value especially that I'll try this on... anything < else I should know before this venerable machine gets opened up? Anything that can trap water like dip switches or adjustable coils will take a long time to dry. Baking in a 170-180F oven will accelerate drying with little risk. I've done this to PDP-11 and VAX boards, a TRS80 and many other boards that were real grungy. The process used at the factory is very similar to a dishwasher (sometimes is!). Allison

27 years, 11 months

EDSAC on your desk.

by SUPRDAVE＠aol.com

(wow, offline for 4 days, and well over 100 messages!) heh, i have that apple emulator program. i think someone gave it to me. it's pretty neat, but the apple // screen is rather small when you're running on a compact mac's screen! the program even included a comm program for a // so you could xfer files between the // and the mac. david In a message dated 98-09-22 16:34:01 EDT, you write: > Have you seen the Apple II emulator 'II in a Mac' for the 68000 Macs? It > placed the moitor, a keyboard, joystick, four floppy drives, printer, and > a clock on the screen. Then you could actually click on the keyboard's > keys or move the joystick on the screen with the mouse. A really neat > interface which, IMHO, did a half decent job at preserving the hardware's > feel. It's a shame more emulators don't do such a good job at portraying > the hardware. > > Tom Owad >

27 years, 11 months

Quantum Q540 as a RD52

by CLASSICCMP＠timaxp.trailing-edge.com

>>So what does it want for input? Don't know if this is a stupid question, >>but am asking since I've never actually used XXDP+ and I didn't get any >>documentation at all with the Packs, despite the fact that the rest had >>related Docs. >type 'STA'. It will prompt you for some information which will be >pretty intuitive... stuff like the hardware address to use, the unit >to format, whether you want bad blocks revectored, etc... If he couldn't figure out the answers to the VS2000 formatter, he's not going to have any easier time with ZRQC! Remember, he's formatting disks that have never been formatted on a VS2000 or RQDX3 before, so he needs all the numbers necessary to MSCP-qualify the disk. Here's the RD52 numbers, straight from the RQDX3 DEC-internal docs: Quantum Atasi ------- ----- Sector Interleave 1:1 1:1 Bytes/Sector 512 512 Sectors/LBN 1 1 LBNs/Track 17 17 Tracks/Group 8 7 Groups/Cylinder 1 1 Cylinders/Unit 512 645 Total LBN's/Unit 69632 76755 RBNs/Unit 168 168 RCT Size (Blocks) 4 4 RCT Copies 8 8 DBNs/Unit 8 8 XBNs/Unit 54 54 User LBNs/Unit 60480 60480 User Capacity (Bytes) 30965760 30965760 Step Pulsewidth (usec) 11.2 11.2 Step Rate (usec) 17.6 17.6 Write Precomp (nsec) 10 10 Precomp Cylinders 256-611 320-644 And, for completeness, the RD51 and RD53 numbers (though I suspect the DEC tables have typos for at least some of the RD51 quantities): RD51 RD53 ---- ---- Sector Interleave 1:1 1:1 Bytes/Sector 512 512 Sectors/LBN 1 1 LBNs/Track 18 17 Tracks/Group 1 8 Groups/Cylinder 4 1 Cylinders/Unit 306 1024 Total LBN's/Unit 22032 139264 RBNs/Unit 144 280 RCT Size (Blocks) 36 5 RCT Copies 4 8 DBNs/Unit 87 82 XBNs/Unit 57 54 User LBNs/Unit 21600 138672 User Capacity (Bytes) 11059200 71000064 Step Pulsewidth (usec) 11.2 11.2 Step Rate (usec) 17.6 17.6 Write Precomp (nsec) 10 (none) Precomp Cylinders 110-305 (none) -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology Voice: 301-767-5917 7328 Bradley Blvd Fax: 301-767-5927 Bethesda, MD, USA 20817

27 years, 11 months

Quantum Q540 as a RD52

by mbg＠world.std.com

>If he couldn't figure out the answers to the VS2000 formatter, he's >not going to have any easier time with ZRQC! Remember, he's formatting >disks that have never been formatted on a VS2000 or RQDX3 before, so >he needs all the numbers necessary to MSCP-qualify the disk. The version of ZRQC I've used doesn't ask any of the stuff you supplied in the rest of your post... as I said, what it asks is pretty intuitively answered (at least it has been for me, and I've not had to enter any of the values). Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

27 years, 11 months

Linux on S/370? Was: Re: printer socket (Off topic)

by cfandt＠servtech.com

At 11:13 21-09-98 -0400, William Donzelli wrote: >> Less S/370s out there? I would think, since they are more recent vintage, >> there would be more. Any reason why? I'll keep my eyes peeled for you though. > >I think is simply the prestige of the S/360s. After all, they are probably >the single most influential computer family of the 1960s. The S/370s just >do not have the same magic in their name. I can agree with that about their influence. IBM had the marketing horsepower and exposure to put them in many banks, insurance companies, factories, etc. more so than say, Buroughs, CDC and any of the other big names of the day. Computers back then were a BIG and Important Investment to a company. IBM made sure everyone got that feeling through their marketing. Ever hear much of an IBM 1130? Any info on the web, etc. on that machine? > >> Yeah, even my beige box 9370 is boring as heck to look at :-( (It's a CMOS >> version of the S/370 from 1987/88.) No interesting front panels, can't >> tinker with hardware much at all, etc. Pah! > >Even the last of the machines tagged "System/370" started to lose their >panels. By the time the 3033 and 4331 came out (mid to late 1970s), the >panels were gone. IBM used the same cabinets until recently switching over >to the black and red (very sharp looking) S/390s. > >S/370 panels are amazing. Unlike the S/360 panels, they are black with all >sorts of color coding, and liberal use of the hexadecimal knobs for >setting the registers. > >I would like to find a picture of any old S/370 on the Web, but I have not >come accross one yet. Interesting that there is no pics to be found so far. I recall seeing the S/370 console at the Deutsches Museum in Munich several years ago. It was amazing indeed at least for that model, to see such a neat operating panel. Wish I had taken some detailed photos of it then I could have someone scan and post them for everyone to see. Anyone have any sales/marketing brochures out there who could scan some good example photos of S/370's? > >> Christian Fandt, Electronic/Electrical Historian > >Lets give Chris a big hand for being an Auction helper at the Antique >Wireless Association meet in Rochester, NY just a few weeks ago. He did >not drop too many things. Thanks! I do worry about handling those $750-$1k DeForest Audions that come through. We've done the auction for many, many years as you may know (how long have you been an AWA member?). I've helped for at least 18 years I think. Usually it's myself, Lauren Peckham and his son, David, who are up there every year and several other old stand-bys in the "sold" area to the right. Thank God we usually have light weight equipment compared to classic computers!! However, a few Radiola 60's and the like come through occasionally and they can get real heavy _real_fast_! The three '30's and early 40's console radios and the early TV were auctioned while just setting in place as you saw. I was kinda sick for most of the day from total exhaustion or more likely burn-out while working at the conference. I wasn't my usual wise-cracking self with Lauren and Dave. I had to sit behind the platform for about 15 minutes around 2 PM as I was about to literally drop. That recharged my batteries, so to speak, and was able to perk me up enough to continue helping. We had, IIRC, 620 individual lots with a huge number of vacuum tube lots this year. Quite a few paper lots too. IIRC, $62,400 or so was sold during the 8 hour duration. New record amounts both in lot quantity and money. I got a few rather nice items for my collection including a Crosley 50A Two-step Amplifier with brass-base tipped '01A's for only $150 and a real early version of the Crosley ACE Type V (wooden book condensor, ceramic tube socket, cylindrical tickler coil) for $130. Somebody was sleeping on those rather rare items :-) I like Crosleys since they're quite interesting and SMALL doggone it! It was great to just relax on Saturday AM and listen to the technical talks. If any of us get involved with a computer collecting club or association like the AWA is to Electronic Communications and that club or assoc. begins to have an equipment auction, and I get involved with helping run the auction, please haul me away to get my head examined! I'm staying HOME!!! :-) Imagine lugging around Cromemco, CompuPro or other loaded S100 systems, or DEC RL02 drives, or IBM DASD units during an auction. Those are truly comparative boatanchors like an RAL-7 or R-390 (old military radios for the unwashed out there) but we sure love 'em, don't we! ;) I did not see you. Should have come up to me and introduced yourself. > >William Donzelli >william(a)ans.net > Christian Fandt, Electronic/Electrical Historian Jamestown, NY USA Member of Antique Wireless Association URL: http://www.ggw.org/freenet/a/awa/

27 years, 11 months

Transformer

by maxeskin＠hotmail.com

In short, if the 128D uses 60W, I need a transformer with a VA of 60 or higher, your recommendation around 100? >> >> >> I visited Radio Shack yesterday, and look for a step-up transformer >> for my European C-128D. They had everything neatly labelled, but >> how do I find out how many watts it's rated for? It has a measurement >> called 'V/A Cap' which goes from about 70 to over a thousand. The >> prices goes up with it. > >OK... VA (not V/A...) is Volt-amps. It's called the 'apparent power' >rating of the load. > >Remember that in a DC circuit you calculate the power by multiplying the >voltage (in volts) by the current in amps. So the VA unit does have the >right dimensions to be power. > >In an AC circuit, things are not so simple. I'm going to stick to >sinusoidal waveforms here, BTW and let someone else handle the nasty >cases. It turns out that if the voltage and current are not in phase with >each other (and they won't be unless the load is perfectly resistive), >then the useful power you can get out of the load - the so-called true >power - is given by V*I*cos(phi) where phi is the phase angle between the >voltage (V) and current (I) waveforms. V and I are the rms values of the >voltage and current, as usual. > >cos(phi) is called the 'power factor' of the system. > >But, the size of the transformer you need is really determined by the rms >values of V and I, no matter what the phase shift is. So that, for >example, if you have a load giving out a true power of 50W, with a power >factor of 0.5, then you need to use a 100W transformer to supply it. > >What does this mean to you? > >I think it's fair to say that 0.5 is an excessively low power factor for >any micro. 0.66 would be pretty low as well. So if you (say) see that >your machine takes 100W, then a 150W or 200W transformer would be ample. >A 100W transformer _might_ be OK, but it might be marginal. Practically, >I'd probably pick smalllest transformer with a VA rating in excess of the >wattage of the computer, and if it doesn't get excessively hot in use, >it'll be fine. > >-tony > > ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

27 years, 11 months

Here comes the Hurricane

by allisonp＠world.std.com

< Well, true, but I was more concerned with the more likely outcome of < flooding. It seems that homes normally stay intact in hurricanes unles < you get the full force, or unless a tornado gets whipped up. Maybe I'm Being from LI NY I'm used to hurricanes. I suggested CLEAN NEW garbage pails to store in as they can be taped closed and tied down. Also they are less likely to be sold out. We'd get one extra 10gal for water! Allison

27 years, 11 months

Transformer

by maxeskin＠hotmail.com

I visited Radio Shack yesterday, and look for a step-up transformer for my European C-128D. They had everything neatly labelled, but how do I find out how many watts it's rated for? It has a measurement called 'V/A Cap' which goes from about 70 to over a thousand. The prices goes up with it. ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

27 years, 11 months

Trying to reach a list member

by museum＠techniche.com

Hi folks, I've been trying to reach Paxton Hoag (WHoaglll(a)aol.com). I've send several e-mail message but apparently I can't reach him. Maybe his ISP is blocking mine or something. I have seen recent posting from him our our list so I know that he's been out there. If anyone is in touch with him could you forward this to him? Perhaps he can contact me on an alternate address, techniche(a)mediaone.net Thanks, Jon

27 years, 11 months

Cleaning a rusty transformer

by CLASSICCMP＠timaxp.trailing-edge.com

>Remember you are working with mains on exposed metalwork (including the >transformer core), so don't do this unless you have experience of such >things. Hasn't every IMSAI owner experienced 120VAC when they touched the traces running to the front panel power switch[*] and got a nasty jolt? :-). I've done it many times, and I'm sure I'll do it again! [*] Yes, I know it's not necessarily a power switch, but it is on all of mine (never had write-protectable RAM). -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology Voice: 301-767-5917 7328 Bradley Blvd Fax: 301-767-5927 Bethesda, MD, USA 20817

27 years, 11 months

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