test-drb June 2007

test-drb@ccmp.vtda.org

224 participants
486 discussions

by aek＠bitsavers.org

> Just wondering, do any of you guys know of something that'll remove epoxy > potting compounds? Hot air gun and a knife. Depending on how much clay is in the potting compound it may need to be hot enough to melt solder. It obviously will melt anything made of soft plastic that was potted, including the outside of electrolytics.

17 years

8" SCSI interface hard drives

by cheri-post＠web.de

Hello Ian, yes, 8 inch harddisk drives do exist with SCSI interface. Seagate produced the Sabre drives with SCSI interfaces with 360MB, 500MB, 1GB and 2GB. I suppose that they were made in the CDC/Imprimis facility, Seagate bought at the end of the 80's. These drives had sometimes a small console attached at the front, including an LCD-display! Apart from that, Fujitsu built interfaces in order to attach their ESMD drives to SCSI-interfaces. The drives then obtained the letters "KS" instead of "K" which stood for ESMD. I'm lucky to own such an interface, but I haven't had the time bring it back to life, as some electronic parts such as capacitors and resistors have been ripped off the PCB due to an excessive shock apparently. Does anybody knows, if other SCSI-drives with form factors greater than 5,25" had been built ? Regards, Pierre > > >From what I have heard, they did make 8" SCSI > interface hard drives (possibly a Seagate Sabre?), but > I was thinking about it the other day, and now I'm not > so sure. I have never seen one, nor have I heard of > one "in captivity". > > So - do they exist? > > -Ian > __________________________________________________________________________ Erweitern Sie FreeMail zu einem noch leistungsst?rkeren E-Mail-Postfach! Mehr Infos unter http://produkte.web.de/club/?mc=021131

17 years

8" SCSI interface hard drives

by ian_primus＠yahoo.com

>From what I have heard, they did make 8" SCSI interface hard drives (possibly a Seagate Sabre?), but I was thinking about it the other day, and now I'm not so sure. I have never seen one, nor have I heard of one "in captivity". So - do they exist? -Ian

17 years

Ancient HP resources

by wacarder＠earthlink.net

My classic computer interests primarily center around early-to-mid 1970s DEC Unibus systems and peripherals. In my computer center I have a couple 1970-72 vintage Hewlett Packard X-Y plotters, an HP7202A and an HP7210A. In college back in the 70s we had an HP7200A, which is pretty much identical to the HP7202A except that the 7202A will support 100, 150, and 300 baud, while the 7200A only supports 100 baud. I am going to hook up the 7202A plotter to my PDP-11/40. It appears to support both 20mA and EIA (RS232) connections. I'd like to connect it to my M7814 20mA DZ11. Currently the only device connected to my 20mA DZ11 is an ASR-33 teletype. All other terminals (DecScopes, DecWriters, VT05, VT100, etc) are connected to the M7819 EIA DZ11. Does anyone here know of anyone who has worked with these kinds of plotters, connecting them to either a PDP-11 or an HP minicomputer? They were made to work in-line with an ASR-33, or they could be used somewhat like a printer, where you could send simple ASCII commands like PLTL for "Plot Line" or PLTP for "Plot Points", and then you would send it X,Y coordinates like "0001,0500". Back in the old days, we used programs like HPPLOT.BAS to do the plotting, and we had a program called CHGEN.BAS to generate characters so we could label our plots. I have these programs loaded on my PDP-11/40. Are there forums for classic HP hardware such as this, where I could get in touch with others who may have experience connecting these devices to my ancient minicomputer? I have Googled and there is not much info out on the web that I can find. Some info is on http://www.hpmuseum.net, but not much elsewhere. I have the User Manual and the Service Manual, as well as several pieces of marketing material on these plotters. Pictures of the plotter can be found at: http://www.woffordwitch.com/HP7202.asp Thanks in advance for any info or advice that anyone might be able to offer. Ashley Carder http://www.woffordwitch.com

17 years

Q-Bus core memory

by aek＠bitsavers.org

> For the Q-bus, I don't even know if any core memories exist. There was a 4k quad board for the original 11/03, but that was long dead by the time the T11 came out.

17 years

What are the really unusual or weird computers?

by aek＠bitsavers.org

> I thought I had seen your name in the output of the > "kudos" word on my G5. I should be in the hidden credits (ie. the 'cat in the hat' picture) >from the first PCI PowerMacs until Apple abandoned PPC in 2005.

17 years

House cleaning -- (mostly) free hardware available in the Seattle area...

by derschjo＠msu.edu

Moved into a new house and in the process realized I have a ton of computer stuff that I haven?t so much as looked at in the past several years. Figured you guys might get more use out of it than I have been. This stuff is free unless otherwise noted. Local pickup in the Seattle area ONLY. Anything leftover will be put on Craigslist in a week or so. Computers: - IBM POWERServer 560. Large MCA-based RS/6000 machine. From memory, it?s got a 50Mhz POWER Cpu, 128mb of RAM. No hard drive. I have an IBM-branded internal SCSI CD-ROM to go with it but no mounting rails. 10/100 ethernet, thicknet ethernet and some sort of FDDI card. Runs AIX 5.1 better than I thought it would. - IBM POWERServer 350. Small (ha) MCA-based RS/6000 machine, desktop sized. 64MB ram, no drive. Thicknet ethernet. - AT&T 3B2 1000/60. 16mb ram, 60MB tape, 350MB SCSI drive. Works, but has been scavenged for parts (missing most EPORTS cards, no dummy plates to replace them). - TRS-80 Data Terminal. Have not tested. A dumb terminal that looks like a Model III :). - HP 9000/236 w/Monitor. Missing ?S? key. Works but reports a floppy controller error on startup. I?d like $25 for this. - Sparcstation 10, dual 40Mhz SuperSparc, 64mb ram. - SGI Personal Iris 4D/35, for parts only ? has no ram or drives, I have no idea if what's in there works. A little bit of rust on the chassis. Ugh. - PowerMac 6100/60 and PowerMac 6100/66. Work, but ugly and probably the worst PowerMacs ever made. What a ringing endorsement! - Commodore Pet 8032. I?d like to get $50 for this, or an interesting trade. Someone did a nasty job replacing a RAM chip which involved seriously burning the PCB and replacing several traces with bits of wire. Amazingly it seems to work fine. Obviously no guarantees :). Laptops: - Tandy 1400HD and Tandy1400LT. No idea if they work, no AC adapter. - ?Leadman? 386, I seem to recall this had 4mb ram and an 80mb drive. AC adapter. - 2x Toshiba Tecra 750CDT, parts only ? both have odd keyboard failures, may be repairable. - 2x AST Ascentia 800n. 50Mhz 486, 8mb ram. Only 1 AC adapter. - 2x Zenith Data Systems SuperSport. 8088, 640k ram, 20mb hard disk, 720k floppy. These worked the last time I used them but I can?t for the life of me find the AC adapters. Monitors: - Apple III monochrome monitor (green phosphor). Decent shape, but has ?GRJC? spraypainted on the top (it was from Grand Rapids Junior College). Small scratch in the glare-proof coating. Works. - Commodore 1702 monitor. Works great, missing fold-out cover over the adjustment knobs in front. - Moniterm Viking 22? B&W monitor, with Mac NuBus adapter to drive it. If I recall it does 1280x1024 at 60Hz. It may be possible to hook a Sun mono framebuffer to it if it?ll do the right refresh rate. Worked last time I used it, but the picture was a bit jumpy from time to time. If you need more details on any of these, don?t hesitate to contact me. Thanks! - Josh

17 years

flexowriter patent

by aek＠bitsavers.org

stumbled upon this looking for something else at uspto.gov http://bitsavers.org/frieden/flexowriter/Patent_2700446_Jan55.pdf

17 years

Multithreaded hardware (LispMs)

by aijones2＠bsu.edu

> > Message: 29 > Date: Sun, 24 Jun 2007 07:38:46 -0400 > From: Brad Parker <brad at heeltoe.com> > Subject: Re: Multithreaded hardware > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> > Message-ID: <200706241138.l5OBckR7029888 at mwave.heeltoe.com> > > I believe the Symbolics 3600 has support for multiple tasks in hardware > at the microcode level. Unfortunately internals of the 3600 are hard to > come by, but I keep digging. > > (I found someone the other day who worked on a "lisp risc machine" FPGA at > Symbolics. He says he may have some tapes... :-) > > -brad > Symbolics last hardware products used a sort of lisp-machine-on-a-chip developed for use inside ATM networking gear (AT&T, maybe?). I think that may be what the "Zora" was. Google's not being very helpful on this one. My memory's not that good, and whatever I originally read was apocryphal at best. I could be wrong, but I think the NXP1000 (the final, headless workstation) used a similar chipset after the other project fizzled. The only relevant link I can find is http://www.sts.tu-harburg.de/~r.f.moeller/symbolics-info/zora/zora.html If you find out anything interesting from your acquaintance with the tapes, you had better post it.

17 years

Massbus simulation

by aek＠bitsavers.org

> Something tells me a MASSBUS-interfaced peripheral would be of > somewhat limited appeal. ;) Every DEC10 owner I know would want one. Guy started on a design, but I think he got tied up with other projects. Mike Ross bought bits of a commercial unit, but I don't think he ever found the software.

17 years

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test-drb June 2007