test-drb

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101090 discussions

by ajp166＠verizon.net

<<I happen to have a Atlantic Research Inc, serial datascope. It contains <<several boards [std bus z80, rom/ram card, CRT5027 based crt controller Card] <<however no manual. Someday I'll track down at least a schematic and fix <<the CRT. The boards say T-Bar on them so the instrument may even be from <<another company with the ACI label. It would be fun to get it operational. I repaired the CRT and foudn it generally less than useful and repurposed the CRT, Power supply and case for a Embedded ELF system... with disk. So now I have the three STD boards and 4 slot backplane... THey do have T-BAR on them and I can do one of two things with them strip them for the CPU, SIO, RAM, EPROM, SMC5027E CRTC. As is without manuals or other useful info they are junk to be reused. Ideally with far more detailed info like schematics make a dedicated z80 system. So I post it again... Allison

8 years, 11 months

FOR SALE: Commodore PET 8032 like new in original box

by sellam.ismail＠gmail.com

I have put up for sale on the Vintage Computer Marketplace a near pristine Commodore PET 8032 in its original box. http://www.vcfed.org/forum/showthread.php?55679-Commodore-PET-8032-Brand-Ne… If interested, please inquire on the VCM or direct to me through e-mail. Thanks! Sellam

8 years, 11 months

Apple //c Prototype, Sphere 1, UniCom 141p for sale (and more)

by sellam.ismail＠gmail.com

Hello All, I have put up for sale on the Vintage Computer Marketplace the following items: Apple //c Prototype http://www.vcfed.org/forum/showthread.php?55676-Apple-c-Prototype-for-sale Sphere 1 http://www.vcfed.org/forum/showthread.php?55677-Sphere-1-early-Personal-Com… UniCom 141p http://www.vcfed.org/forum/showthread.php?55678-Unicom-141p-First-commercia… I also have a lot more machines of all kinds remaining in my collection that I am selling. Most of the machines in this post are still available (though the prices listed are obsolete as this is an old post): http://www.vcfed.org/forum/showthread.php?51781-Mulitple-and-divers-compute… All prices are negotiable. The intent is to sell these items. Thanks! Sellam

8 years, 11 months

Introduction to DECSYSTEM-20 PDF?

by lists+cctalk＠loomcom.com

I'm looking for a PDF of "Introduction to DECSYSTEM-20 Assembly Language Programming" by Ralph E. Gorin. It used to be hosted on PDPPlanet (xkleten.paulallen.com), but that's been down for a while. Does anyone else have a copy they could send me? Best Wishes, -Seth -- Seth Morabito seth at loomcom.com

8 years, 11 months

LGP-30 Memory Drum Update

by blstuart＠bellsouth.net

On Tue, 1/3/17, Cory Heisterkamp <coryheisterkamp at gmail.com> wrote: > What I?m wondering is if anyone is familiar with the setup/adjustment > procedure for getting the heads set correctly. There *might* be a couple of > unused tracks I can relocate heads to, but my thought is that if half a > dozen heads were already in contact, then the rest may be perilously close > as well (swelled drum?). My odds of setting 71 heads perfectly on a 50 year > old worn drum is?well?not great. A while back I read a procedure (probably in reference to the G-15). Quite frankly, it scared me a little, but I'll pass it on. The idea is to use sound. The tech would use a screwdriver as a sounding bar between the casing and his ear. Then the head was tightened down until you could just hear it start to brush. I don't remember for sure, but I'd have to think that you would then back off just enough for the brushing sound to stop. I don't recall whether the article said that this was done with the motor running or the drum was being turned by hand, but if it were my machine, I'd set the heads turning the drum slowly by hand and then check for any brushing sound when the motor comes up. Whether or not the drum is restorable, I'd still plan on building a drum simulator. That way you can get the rest of the machine up and running without stressing or depending on the drum too much. Plus if the drum does turn out to be unrestorable, you'll still be able to run the rest of the machine. As to how to approach the simulator, I would have to think a C.H.I.P. or a Pi would have plenty of horsepower, especially if you drop Linux and either run on the bare metal or as an in-kernel driver in something lighter weight. BLS

8 years, 11 months

LC8-P (M8365) PDP8 printer interface schematics

by djg＠pdp8online.com

I would also be interested in schematics. I have just started looking at this board to try to use it with a ODEC/Data 100 chain printer. > Looking at the LA180 manual's description of the LC8-P interface, it > is pretty close to Centronics. I expect it is more than just a cable, > though, because there is also an OMNIBUS Centronics printer interface > board (LS8-E). That schematic is on bitsavers. > It looked to me the LA180 protocol is demand and busy high when ok to send character then the data is strobed in with data strobe pulse. Centronics is handshaked with strobe and busy so a little different. The board is simple enough that tracing it out is feasible if needed. Haven't plugged in the board yet to see how the signals behave. Still working on the printer.

8 years, 11 months

Docs needed: DEC MXV11-B multi function module

by j_hoppe＠t-online.de

Hi, I've an DEC QBUS multifunction module here. Type is MXV11-B M7195. It does not boot into its ROM menu, despite I compared all the jumpers multiple time against documentation and a reference boards. So it seems something in the ROM address logic is burnt. Somebody has the FPMs schematics? I even can scan micro fiches. Thanks, Joerg

8 years, 11 months

LGP-30 Memory Drum Update

by coryheisterkamp＠gmail.com

While waiting for the machine, I decided to investigate the stuck drum. This unit has 71 read/write heads plus what appears to be an inductive pickup for the system clock. Upon closer examination I discovered multiple heads in contact with the drum surface preventing rotation. And in the process of removing the mounting bars that secure the heads only then did damage become visible on a couple of tracks (scored oxide under the heads). What I?m wondering is if anyone is familiar with the setup/adjustment procedure for getting the heads set correctly. There *might* be a couple of unused tracks I can relocate heads to, but my thought is that if half a dozen heads were already in contact, then the rest may be perilously close as well (swelled drum?). My odds of setting 71 heads perfectly on a 50 year old worn drum is?well?not great. For kicks, I tried to use a piece of cheap (=thin) (0.004?) notebook paper as a feeler gage to see if I could identify the offending heads prior to support removal. This was a no-go as clearance was too tight. So, is it true these ride 0.001? off the surface? I suspect with temp and humidity changes, and given the age, I would be better off building a solid state drum emulator for the 4KW mem, but retaining the drum for the clock and possibly the 3 fast registers..if I can get those (7) heads set correctly. Any input is welcome. -C

8 years, 11 months

ISO small quantity of 3M 3418 40 pin pcb to ribbon male connectors

by aek＠bitsavers.org

I need some of these for making Diablo disk drive cables. Mouser/Digikey, etc. have a minimum buy of 500 (at $9 ea). Picture at http://multimedia.3m.com/mws/media/140452P/ts0005-pcb-connector.jpg Anyone see any at any surplus places? Online searches are pretty much useless because of the extremely common 40 pin male IDC plug, and my searches in the valley have come up empty.

8 years, 11 months

Where are the cctech archives before November 2014 ?

by w.f.j.mueller＠retro11.de

Hi, after I remarked in November last year that the cctech archives have been `lost` Jay West responded > Walter.... > > I think you need to ask a few questions before you toss that kind of nonsense out. > > For your info - this is a hobby. It is done in spare time. The time period you > peak of - the archives have NOT been lost. Because unlike what you intone - we > do care. Those archives are safe and sound, just not in a publicly accessible > format. One of our kind list members has been working for eons to reconstruct > the publicly viewable content from them. > > I will tell him that you are going to volunteer to help him. Well, it is certainly true that the archives visible under http://www.classiccmp.org/pipermail/cctech/ only go back to November 2014. Thanks to the Internet Archive there is a full backup of the older archive sections readily available online. Simply open http://web.archive.org/web/20141025062159/http://www.classiccmp.org/piperma… and one gets all archives from October 2014 back to February 2005. There I found the postings I was looking for, and updated my links to use http://web.archive.org/. That's all. So in a wider sense nothing is lost, one has to search in the right place. With best regards, Walter

8 years, 11 months

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