test-drb

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101090 discussions

by jnc＠mercury.lcs.mit.edu

> From: Bill Gunshannon >> From: Jerry Weiss >> Note: Apparently the RY emulation won't load if more than 256K memory >> is specified ... I'm entirely not sure why SIMH has to enforce this >> as its possible to work around .. Anyone know how to override and load >> in SIMH? > If it didn't it wouldn't be emulating real PDP-11 hardware. ... > RX02 systems and they do not work with more than 256K. Right, the hardware only has 18 bits of 'buffer address' (in both UNIBUS and QBUS versions). But one can still plug one into a QBUS system with more than 256KB, and use it - you just can't use memory above 256KB for transfers to/from the RX02, since it cannot physically create those addresses. If sounds from Jerry's description as if SIMH refuses to emulate an RX02 if the emulated system is configured with more than 256KB - which would be a bug, if so. Noel

7 years, 10 months

Identifying TO-3 w/HP house numbering

by w9gb＠icloud.com

Josh - You may want to contact Denis Kohlhagen, at Butler Winding. IF this is for the preservation of an HP terminal in the museum, they may wish to assist in rebuild/rewinding that flyback. There are US firms that can perform this work, and publicity of preserving history is desired by some corporate marketing dept. Butler Winding 7426A Tanner Parkway; Arcade, NY 14009 USA http://www.butlerwinding.com/ Phone: 1-716-532-2234 Fax: 1-716-523-2702 == ?I poked around a bit more this morning and it's looking like part of the flyback is shorted out -- we have a 2382 at the museum and I popped it open just now and I verified that it measures differently (i.e "not shorted" :)) at the same points. So that's likely my problem. Drat. - Josh? Sent from iPad Air

7 years, 10 months

OTsorta : Old phone system(s) avail

by jwest＠classiccmp.org

I know some of our members are into phones... I am tossing the following in a skip to go to a recycler. I'd rather not ship the units, but am willing to pull any boards if someone needs them. Toshiba Strata DX Toshiba CIX200 Toshiba CIX40 The will be sent off to recycler Monday or Tuesday. J

7 years, 10 months

Documation TM200 card reader - pinch roller restoration

by jnc＠mercury.lcs.mit.edu

> From: Guy Dunphy > The mechanics has no adjustment or spring tension on the pinch roller > positions. ... all the spring is in the rubber of the rollers. > But how much squish? > ... > I'm hoping someone might have some knowledge of how much punch card > reader pinch rollers should press against capstans. Does 0.2mm squish > seem right To produce a given force on the card, the dimensional amount of squish needed would depend on the rigidity of the material, no? A stiff material would need/want less than something soft, I would think. Noel

7 years, 10 months

Wanted: tech docs on original Iomega 8-inch full height 10MB Bernoulli drive (Alpha-10)

by spacewar＠gmail.com

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?

7 years, 10 months

Wanted: tech docs on original Iomega 8-inch full height 10MB Bernoulli drive (Alpha-10)

by david4602＠gmail.com

On 10/15/18 1:00 PM, cctech-request at classiccmp.org wrote: > From: Michael Brutman <mbbrutman at brutman.com> > > 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 I've got a collection of 1/2 height 8" drives, and one among them (a 20 MB unit) is able to come online with a cartridge inserted. Maybe head cleaning is what is troubling the others - but I have no idea how I'd jam a cotton swab in there and find the heads to attempt a cleaning. I have a Bernoulli card in a PC that will lift the bits from DOS-formatted cartridges, and I hook the drive up to an old Mac with a SCSI card in it to image other arbitrary types (I've seen them used as audio recording devices as well as external storage for HP equipment). - David

7 years, 10 months

Paul Allen

by c.murray.mccullough＠gmail.com

One of the founders of MicroSoft has passed on. The world has lost a true early computer pioneer. Murray--

7 years, 10 months

Paul Allen - RIP

by healyzh＠avanthar.com

https://www.king5.com/article/news/local/microsoft-co-founder-paul-allen-di… Paul Allen just died. Zane

7 years, 10 months

Apple IIe addendum

by drlegendre＠gmail.com

Folks, Yay, I was wrong! The IC seems to be OK, the issue was a stuck-on kb switch. A quirk of the Apple design causes the last-pressed key to repeat continuously if any key is being held 'on'. That leaves me needing two kb switches and possibly one 'tilde' key. This is the beige IIe kb with small black print. Thanks for the space, Bill

7 years, 10 months

TeleVideo Systems stuff

by pat＠vax11.net

After VCFMW this year, I've been looking at old projects I have and was wondering if anyone has any leads on TeleVideo systems. I'm looking for TS-800 terminals/systems, and interested in probably any 1980s Televideo terminals, depending on price, especially the 950, and 965s... and keyboards for them. I'd also like to find a TPC-II (the 8088-based portable computer). I used to have one growing up, and there's a bit of nostalgia there. It seems like there's more Televideo stuff lately than I remember being on eBay before, but it's all fairly expensive, especially the computers. I have picked up a few affordable things (970 & 965 terminals missing some keyboards and a TS-803 that I'm still waiting on). I have a couple of TS-801's, TS-806C and a TS-816 that are in various states of repair, that I've been poking at. I also have various Qbus era DEC stuff that I could probably trade for it. Any leads would be appreciated! Thanks, Pat

7 years, 10 months

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