test-drb

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101090 discussions

by aek＠bitsavers.org

> Out of curiousity wouldn't 'dd' on UNIX, or a the following on VMS work? A hybrid disk has multiple sessions recorded on it. On the DEC disk, the first session is a music track, and the second is a 9660 file system with Windows gunk on it. The tarball has everything from the second session. I tried making an ISO image, and it only saves the first session. The content is fairly lame. Some blocky AVI's, and the DEC timeline with low resolution images from the DEC archives, pretty much identical to the timeline that was on the DEC website. The whole thing is about 90mb.

17 years, 8 months

Problems with 2114s

by fjkraan＠xs4all.nl

Henk Gooijen wrote: > Hi Fred Jan, > > are you sure those are 2114's? > Not that I am 100% sure, but to me those are 2111 RAMs, 400 ns types. > > Thanks for pointing out my camera optics are better than the internals ;-). The chips are clearly 2111s, even the schematics agree with this. Making it an even weirder design; 256 bytes of stack RAM. Fred Jan

17 years, 8 months

Fwd: Re: Fwd: HP 9000/300 computers available

by rtellason＠verizon.net

I contacted a friend of mine who lives in Kentucky, and forwarded that post to him. He's not interested in the machines, but might be willing to help out a bit: ---------- Forwarded Message ---------- Subject: Re: Fwd: HP 9000/300 computers available Date: Monday 06 October 2008 18:45 To: "Roy J. Tellason" <rtellason at verizon.net> > > I work in Lexington, so it's not far at all. But, like you, > > I don't have room for those systems. I could assist someone > > in having them shipped somewhere if anyone wanted them > Ok, since you didn't respond to my earlier post and since I have the > feeling from earlier comments that you're not into putting your info out > there the way I do, how about I just take the above and forward _that_ bit > to the list? Then I can take what replies I get and forward 'em to you. > > Will that work for ya? Ok, that'll work. It's been a hectic day at work. I may be a bit slow about getting things shipped out, too. It's beginning to look like I may end up working lots of OT in the next few weeks. Dave ------------------------------------------------------- So, if someone wants those machines, email _me_. I'll batch up the replies and pass 'em along to Dave, to work out whatever he's able and willing to handle with the parties involved. How's that? -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin

17 years, 8 months

DEC 40th anniversary CD

by aek＠bitsavers.org

The disc is a hybrid audio/isofs, so I wasn't able to figure out how to make an image. A tarball of the isofs part is up now under http://bitsavers.org/bits/DEC/cd

17 years, 8 months

Evolution of Memory Protection and Virtual Memory

by ploopster＠gmail.com

Hi. I'm looking for reference materials regarding very early implementations of virtual memory and/or memory protection. I'm really most interested in exploring the evolution of these features in operating systems. Anyone have any pointers for me as to where to look for this information? Thanks. Peace... Sridhar

17 years, 8 months

lying on customs forms

by james＠jdfogg.com

> I'm a bit annoyed at the latest request that I falsely put > a value of $25 on a customs form. At least he's asking > before he bids. Would someone in Europe please comment on > customs duties and lying on forms? I've had $giantUScorp expect me to lie to Customs officials about my purpose to enter Canada. They wanted to avoid paying a $200 work visa. I told them they can pay it or they can get someone else to do the job. I doubt $giantUScorp was going to bail me out of a foreign jail, hire a lawyer to get me undone and pay me for all my wages during that time.

17 years, 8 months

Closed vs. open source timeline.

by andy＠smokebelch.org

So whilst the GNU project was announced in 1983 I've heard many examples being cited of the source to software being shared prior to this, E.g. IBM's VM up to vN.N. And indeed recall reading somewhere that up until a certain point in time the source to most if not all software was available. As vendors made their money from hardware sales and you were unlikely to be able to buy a clone or build a machine yourself, and so safe-guarding source code was not a major concern. Does anyone know if the history of closed/unavailable vs. open/available source is documented anywhere? Ideally in a book or journal that can be properly referenced. Regards, Andrew ---------------- Andrew Back a at smokebelch.org

17 years, 8 months

Otrona Attache: The adventure continues

by derschjo＠msu.edu

Thanks to TonyM, I have a replacement power supply that works and I now have the Otrona mostly running. (I do intend to repair the original power supply -- I found what looks to be a bad transistor and I've ordered a replacement (can't find it at the local shop.)). The Otrona almost works properly, it just won't boot from floppy. I need a bit of help debugging the floppy controller. Thus far I've verified that the following are good: - The drives themselves and the disks I'm trying to boot from (hooked the drives up to my PC and used ImageDisk to dump the disk contents successfully) - The drive cable - The NEC 765 controller (was originally bad! replaced with a known-good 765 from an old PC floppy controller and this improved things somewhat.) Symptoms are: Drive spins up, seeks to track 0 but won't boot; running the ROM diagnostics (thanks to Bob for a scan of the service manual!) helps narrow down things a bit: - The "Format" diagnostic runs, which means the heads load, the drive seeks, and enough is working so that the Otrona thinks it's formatting. I've tried reading the resultant diskette using ImageDisk and it chokes on it, so I'm not sure it's formatting correctly. - Reading or Writing a sector on a known good, CP/M formatted floppy fails. The error code returned (4004) indicates a missing Sector ID. There aren't a lot of chips involved in the floppy controller (about 12 or 13) so I'm hoping this shouldn't be too hard to track down. Any suggestions on where to start? (Schematic at http://oldcomputers.net/Attache_Schematics.pdf on page 6). Would it make sense to start investigating the chips leading back from the /RD DATA pin? Thanks as always, Josh

17 years, 8 months

desirous of acquiring a Tektronix TC-2000

by jmartins＠escrapusa.com

We have one unit available If any interest email us Thanks 45martins at comcast.net

17 years, 8 months

(fwd) VT220 keyboard (cont'd)

by ard＠p850ug1.demon.co.uk

> > >Thanks for the replies, all, especially Tony Duell who had it > >spot-on: Alas I've seen it dar too many times... > > > >>This normally means there's a short in the keyboard matrix, as if one = > key=20 > >>is stuck down. > >> > >>What I would do is open up the keyboard casing (there are 2 screws = > under=20 > >>the plastic posts/feet) and remove the internals.=20 > >(snip) > >>Connect the PCB to the terminal with the normal cable and power up. = > Most=20 > >>likely the LEDs will go through the normal sequence and there'll be no=20 > >>error message, which shows the fault is in the keyboard itself. > > > >The LED's do indeed cycle when the isolated PCB is hooked up, and > >eventually "VT220 OK" appears on the screen. So now I either have So the electronics is almsot certainly working. > >to find the shorted key (it's pretty dirty in there so blowing > >with compressed air might help) or just get another keyboard. I If uou are really keen, you could try to find the shorted key. I have a pinout of the keyboard tails, it's a 17*8 matrix : J1 : N/C Row 5 Row 7 N/C LockLED/ Col 2 Col 3 N/C Col 4 Col 1 Col 5 N/C J2 N/C Col 6 COl 7 Col 8 Col 0 Col 9 HoldLED/ Row 4 Col 10 Col 11 Con 12 LED+ J3 WaitLED/ Col 13 Row 0 Col 14 Col 15 Col 16 Row 1 Row 2 Col 17 Row 3 Row 6 ComposeLED/ If you're not sure what end the pins are numbered from, the 'Row' lines go, in order to port 0 of the 8051 microcontroller, the column lines come >from the outputs of the '145 chips E2 (cols 0-9( and E3 (10-17) What you need to do is check each Row connection to each Column connection with an ohhmeter. See if you van find one that's low resistance. When you do, let me know the row and column and I can tell you which key that is. You might then be lucky in that removing the key and lifting the leaf spring away from the membrant might cure it. But alas it rarely does. > >won't try and wash it after reading the warnings here. > > > >BTW I see one on ebag right now (190254818657) but it's a > >"VT220-Style" unit, made by another manufacturer. Think it'd work > >with a real VT220? I doubt it. Many manufactuered copied the keyboard layout and design but not the interface. I thought LK201s were not that hard to find. -tony

17 years, 8 months

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