Identifying TO-3 w/HP house numbering
Hey all -- Got an HP 2382A terminal I'm attempting to resurrect. I get no video, no heater, no high voltage. What I believe to be the horizontal output transistor appears to be bad, but I'm not sure if this thing contains internal diodes that might be throwing off my testing attempts. It's labeled "1854-0900." Anyone know what this actually is? (Anyone have a service manual for this terminal?) Thanks, Josh
Re: Wanted: tech docs on original Iomega 8-inch full height 10MB Bernoulli drive (Alpha-10)
I can confirm that the media is starting to degrade - at least, it does if it wasn't stored properly. I have a couple of cartridges here that are shedding badly. You can manually open the cartridge by tripping the catches and sliding the door open, and look at it. Here's a picture of such a shedding/unusable cartridge after an attempt to read it: https://i.imgur.com/Pb4AyQo.jpg The oxide clogs the heads up pretty good - it's vital to keep the heads clean and to inspect cartridges before using them so you don't gunk them up. Look for dull/chalky looking media. Obviously any mold spots are bad as well. And if you do get a bunch of read errors (clunking noise), be sure to check and clean the heads before using a good cartridge. I'm not sure if the oxide buildup will damage otherwise good media, but I can't help but think it might. I do have a fully working 10MB drive and controller, and the ability to image cartridges. I'd love to find more actual technical documentation on these drives as well, everything I know about them is from getting mine to run. I'm also always looking for more cartridges. -Ian On Sun, Oct 14, 2018 at 9:59 PM Michael Brutman via cctalk wrote: > > Hi Eric, > > I have working 10MB and 20MB units here being driven by a PC XT with the > Iomega specific card for them. > > I've had to puts lots of effort into cleaning the heads on them. I'm not > sure if there is an oxide shedding problem or just 30 years of dust that > I'm fighting, but they do seem to be very finicky at this stage. It also > could be a media formatting problem; I think they have servo tracks that > were laid down at manufacturing time, so if you have a read error on the > servo track there is no way to fix it. > > > Mike > > > On Fri, Oct 12, 2018 at 9:34 AM Eric Smith via cctalk > wrote: > > > Does anyone have the user, technical and/or service manual for the original > > 10MB Iomega Bernoulli drives? Bitsavers has the manuals for the later > > half-height 10.0/10.5 MB "Alpha-10H", but I'm looking for docs for the > > original model, which was full-height with a SASI (pre-SCSI) interface. > > > > I have the drives, about 20 cartridges that I want to image, and some > > additional scratch cartridges. > > > > I've never used Bernoulli drives before. These drives and cartridges were > > last used around 1986. I'll disconnect and test the power supply before > > powering up the actual drives, but is there anything else I should be > > concerned with? > > > > Does anyone have known-working 8-inch Bernoulli drives? > >
Re: [TUHS] Ultrix Tape: Block Size?
#$%^ - they >>weren't<< like DECtape from a reliability standpoint ... ᐧ On Mon, Oct 15, 2018 at 5:00 PM Clem Cole wrote: > Be careful, TK-50 is different than 9-track. It's a streamer tape like > QIC, 4mm and 8mm. The blocking is done under the covers by the HW and the > blovk size if just how a DMA is done. I recommend that you pre-fetch the > read with dd or double-dd setting ibs=64k, obs=20b and conv=sync and pipe > the output to the reader (tar/cpio or the like) [if that fails try > obs=1b]. This should work well as can (TK-50 overall suck - don't set > your hopes high on anything with them -- they were DECtape from a > realiabilty standpoint, they were different from the reset of the world, > the performance was poor and they were expensive). > > Anyway, by using dd or the like a front end, it will allow the read > streamer to read as fast as it can. The problem is that the way it works > under the cover does not shine with traditional UNIX I/O. BTW: ibs of > anything more than 64K on a VAX (or PDP-11) will not help because of the > dma size on the Unibus caps DMA read/writes at 64K. On a PMAX or (under > Tru64 on a Alpha), you can try using really large ibs sizes depending on > your physical memory size. > > BTW: What will help the most is actually finding a copy of the old > double-dd program (from the UUNET archives) which forks off two child > procees to perform the actual I/O and alternates between the two processes > via pipe between them and controller - so one dd process is reading when > the other dd process is writing. [It used to be called: ddd before the > Gnu guys grabbed that name for the debugger]. The command line might be > something like: ddd ibs=64k obs=20b | tar xvpf - > > FWIW: I wrote a version of a fast dd years ago that used pthreads and a > semaphore that I should still have kicking around. At one point when I > was dealing with streamer tapes for backup, I definitely ran it on Tru64 > and FreeBSD, but I've forgotten where Ultrix fell. > ᐧ > > On Mon, Oct 15, 2018 at 4:01 PM Warren Toomey wrote: > >> All, I received this request from Matthew who isn't subscribed to either >> the TUHS or cctalk lists. He knows how to read the lists archives. Many >> thanks for any help you can provide. >> Cheers, Warren >> >> - Forwarded message from Matthew Whitehead - >> >> Date: Mon, 15 Oct 2018 08:25:39 -0400 >> From: Matthew Whitehead >> Subject: Ultrix Tape Blocks >> >>Warren, >> I wonder if you can give me a referral. I want to install Ultrix-32 >>on my MicroVAX II using the ancient TK-50 tape drive. I know the tape >>files are on your archive, but I need to know the block size for each >>of the many files; it can vary a lot. >>Who might be able to help me with this? >>Matthew Whitehead >> >> - End forwarded message - >> >
Re: [TUHS] Ultrix Tape: Block Size?
Be careful, TK-50 is different than 9-track. It's a streamer tape like QIC, 4mm and 8mm. The blocking is done under the covers by the HW and the blovk size if just how a DMA is done. I recommend that you pre-fetch the read with dd or double-dd setting ibs=64k, obs=20b and conv=sync and pipe the output to the reader (tar/cpio or the like) [if that fails try obs=1b]. This should work well as can (TK-50 overall suck - don't set your hopes high on anything with them -- they were DECtape from a realiabilty standpoint, they were different from the reset of the world, the performance was poor and they were expensive). Anyway, by using dd or the like a front end, it will allow the read streamer to read as fast as it can. The problem is that the way it works under the cover does not shine with traditional UNIX I/O. BTW: ibs of anything more than 64K on a VAX (or PDP-11) will not help because of the dma size on the Unibus caps DMA read/writes at 64K. On a PMAX or (under Tru64 on a Alpha), you can try using really large ibs sizes depending on your physical memory size. BTW: What will help the most is actually finding a copy of the old double-dd program (from the UUNET archives) which forks off two child procees to perform the actual I/O and alternates between the two processes via pipe between them and controller - so one dd process is reading when the other dd process is writing. [It used to be called: ddd before the Gnu guys grabbed that name for the debugger]. The command line might be something like: ddd ibs=64k obs=20b | tar xvpf - FWIW: I wrote a version of a fast dd years ago that used pthreads and a semaphore that I should still have kicking around. At one point when I was dealing with streamer tapes for backup, I definitely ran it on Tru64 and FreeBSD, but I've forgotten where Ultrix fell. ᐧ On Mon, Oct 15, 2018 at 4:01 PM Warren Toomey wrote: > All, I received this request from Matthew who isn't subscribed to either > the TUHS or cctalk lists. He knows how to read the lists archives. Many > thanks for any help you can provide. > Cheers, Warren > > - Forwarded message from Matthew Whitehead - > > Date: Mon, 15 Oct 2018 08:25:39 -0400 > From: Matthew Whitehead > Subject: Ultrix Tape Blocks > >Warren, > I wonder if you can give me a referral. I want to install Ultrix-32 >on my MicroVAX II using the ancient TK-50 tape drive. I know the tape >files are on your archive, but I need to know the block size for each >of the many files; it can vary a lot. >Who might be able to help me with this? >Matthew Whitehead > > - End forwarded message - >
RE: Paul Allen
And an important figure in the preservation of computer history to boot. A very sad day. Sent from my Windows 10 device From: Murray McCullough via cctalk Sent: 15 October 2018 23:53 To: cctalk Subject: Paul Allen One of the founders of MicroSoft has passed on. The world has lost a true early computer pioneer. Murray--
Paul Allen
One of the founders of MicroSoft has passed on. The world has lost a true early computer pioneer. Murray--
Re: Paul Allen - RIP
https://www.king5.com/article/news/local/microsoft-co-founder-paul-allen-dies-at-65/281-604572895 Paul Allen just died. Zane Bummer! -- : Ethan O'Toole
Paul Allen - RIP
https://www.king5.com/article/news/local/microsoft-co-founder-paul-allen-dies-at-65/281-604572895 Paul Allen just died. Zane
Re: Ultrix Tape: Block Size?
If it is anything like installing NetBSD, which I have done on a VAXstation with a DLT4 drive, it should be 512 byte. So, while I do not know for sure for Ultrix and MicroVAX, 512 is probably a good starting point? Hopefully someone else will *actually* know. Aaron Warren Toomey via cctalk writes: > All, I received this request from Matthew who isn't subscribed to either > the TUHS or cctalk lists. He knows how to read the lists archives. Many > thanks for any help you can provide. > Cheers, Warren > > - Forwarded message from Matthew Whitehead - > > Date: Mon, 15 Oct 2018 08:25:39 -0400 > From: Matthew Whitehead > Subject: Ultrix Tape Blocks > >Warren, > I wonder if you can give me a referral. I want to install Ultrix-32 >on my MicroVAX II using the ancient TK-50 tape drive. I know the tape >files are on your archive, but I need to know the block size for each >of the many files; it can vary a lot. >Who might be able to help me with this? >Matthew Whitehead > > - End forwarded message - -- Aaron Jackson - M6PIU http://aaronsplace.co.uk/
Re: [TUHS] Ultrix Tape: Block Size?
I'm glad you corrected because when they worked, they were awesome. When they didn't, life had a lot of swearing in it... And when I was sysadmin for the MicroVAX II that had them, I swore like a sailor Warner On Mon, Oct 15, 2018 at 3:04 PM Clem Cole wrote: > #$%^ - they >>weren't<< like DECtape from a reliability standpoint ... > ᐧ > > On Mon, Oct 15, 2018 at 5:00 PM Clem Cole wrote: > >> Be careful, TK-50 is different than 9-track. It's a streamer tape like >> QIC, 4mm and 8mm. The blocking is done under the covers by the HW and the >> blovk size if just how a DMA is done. I recommend that you pre-fetch the >> read with dd or double-dd setting ibs=64k, obs=20b and conv=sync and pipe >> the output to the reader (tar/cpio or the like) [if that fails try >> obs=1b]. This should work well as can (TK-50 overall suck - don't set >> your hopes high on anything with them -- they were DECtape from a >> realiabilty standpoint, they were different from the reset of the world, >> the performance was poor and they were expensive). >> >> Anyway, by using dd or the like a front end, it will allow the read >> streamer to read as fast as it can. The problem is that the way it works >> under the cover does not shine with traditional UNIX I/O. BTW: ibs of >> anything more than 64K on a VAX (or PDP-11) will not help because of the >> dma size on the Unibus caps DMA read/writes at 64K. On a PMAX or (under >> Tru64 on a Alpha), you can try using really large ibs sizes depending on >> your physical memory size. >> >> BTW: What will help the most is actually finding a copy of the old >> double-dd program (from the UUNET archives) which forks off two child >> procees to perform the actual I/O and alternates between the two processes >> via pipe between them and controller - so one dd process is reading when >> the other dd process is writing. [It used to be called: ddd before the >> Gnu guys grabbed that name for the debugger]. The command line might be >> something like: ddd ibs=64k obs=20b | tar xvpf - >> >> FWIW: I wrote a version of a fast dd years ago that used pthreads and a >> semaphore that I should still have kicking around. At one point when I >> was dealing with streamer tapes for backup, I definitely ran it on Tru64 >> and FreeBSD, but I've forgotten where Ultrix fell. >> ᐧ >> >> On Mon, Oct 15, 2018 at 4:01 PM Warren Toomey wrote: >> >>> All, I received this request from Matthew who isn't subscribed to either >>> the TUHS or cctalk lists. He knows how to read the lists archives. Many >>> thanks for any help you can provide. >>> Cheers, Warren >>> >>> - Forwarded message from Matthew Whitehead - >>> >>> Date: Mon, 15 Oct 2018 08:25:39 -0400 >>> From: Matthew Whitehead >>> Subject: Ultrix Tape Blocks >>> >>>Warren, >>> I wonder if you can give me a referral. I want to install Ultrix-32 >>>on my MicroVAX II using the ancient TK-50 tape drive. I know the tape >>>files are on your archive, but I need to know the block size for each >>>of the many files; it can vary a lot. >>>Who might be able to help me with this? >>>Matthew Whitehead >>> >>> - End forwarded message - >>> >>
Re: Wanted: tech docs on original Iomega 8-inch full height 10MB Bernoulli drive (Alpha-10)
Hi Mike, The Bernoulli disks definitely do use servo, so as you say, if the servo patterns are damaged the data is toast. Do you have any advice on head cleaning? The docs on the second-generation drive (Alpha-10H) just say to use a cleaning cartridge, and I don't have one. I've cleaned floppy drive heads with isopropyl and a lint-free swab, but I'm reluctant to do this to the Alpha-10 without advice from someone who's done it. Best regards, Eric
Ultrix Tape: Block Size?
All, I received this request from Matthew who isn't subscribed to either the TUHS or cctalk lists. He knows how to read the lists archives. Many thanks for any help you can provide. Cheers, Warren - Forwarded message from Matthew Whitehead - Date: Mon, 15 Oct 2018 08:25:39 -0400 From: Matthew Whitehead Subject: Ultrix Tape Blocks Warren, I wonder if you can give me a referral. I want to install Ultrix-32 on my MicroVAX II using the ancient TK-50 tape drive. I know the tape files are on your archive, but I need to know the block size for each of the many files; it can vary a lot. Who might be able to help me with this? Matthew Whitehead - End forwarded message -
