test-drb August 2018

test-drb@ccmp.vtda.org

112 participants
131 discussions

by jnc＠mercury.lcs.mit.edu

> As to what _else_ it is doing, and why it has the cable to the main > card... I think that it must intercept MSYN from the processor and only > let it pass if there's no hit in the cache. > (To explain why it would need to do that... normally with the MS11, > there's a static partitioning between FastBus memory and UNIBUS A > memory. So when the CPU goes to do a memory cycle, it can put the > address out on both the UNIBUS and FastBus, with the certainty that it > will only get a reply on one. So, my guess was wrong there. I had _assumed_ that when doing a memory operation, the CPU started a cycle on both busses, to minimize the delay on the UNIBUS cycle if the MS11 on the FastBus didn't have that location. (I had previously checked, and there is an 'I have that location' signal which the MS11 sends back, making the concept of a cache possible.) Well, no. In the "KB11-A CPU Maintenance Manual" (DEC-11-HKBB-D), section 7.7.1 ("Bus Control Introduction"), it says: If the address applies to a Fastbus device, that device will respond in time to inhibit the UNIBUS MSYN signal (It turns out the KB11-A is very clever; it has to delay for a bit after asserting the address, etc, signals on the UNIBUS, for de-skew, before it can assert MSYN, and during that delay, in parallel, it checks to see if the MS11 has that location.) So my theory about what that double-card does (prevent an MSYN sent to main memory on a cache hit) is apparently wrong. Which leaves the question of what that card _does_ do... The cache _does_ need to have the A and B UNIBUS tied together, so that it can snoop UNIBUS memory cycles (which are on the A UNIBUS) via the B UNIBUS (which is what it has access to on the backplane), _but_ it doesn't need a special card, with i) active logic, and b) a cable back to the main board, to do that - a regular M9200 will do that. The cable back to the main card, and the logic on the two dual-width cards, mean it wants to interfere somehow in the connection between the A and B UNIBUS. But if not the MSYN thing, what else could it be? I have pondered that question, but I can't think of anything. It can't be doing anything with interrupts or DMA, I would think, so no grant interception. So what else could it be? Anyone have any ideas? Noel

8 years, 1 month

ACT Able, Datasouth

by useddec＠gmail.com

I have a bunch of Able items here If you have any questions, please contact me off list. If you have any info, please share it with us. several models of Quniverters 10028, 10028101, 10028102 some boards have 3 #s This is the mysterious PDP 11/45 board. RARE? 10033, 10033001, 10033002 PDP1134, 11/40 cache RARE? SN267 10003000, 10003001, 10003002 10049, 10049-0, 10049001,10049002 High speed link Datasouth board for LA36 I believe.

8 years, 1 month

IMS DYNATECH, UNISYS, EECO Paper tape, Datamyte

by useddec＠gmail.com

This is a very old rack mount disk controller (has format switch) with what looks like ims on the 15 or so small boards. The backplane has DYNATECH on the back. Two Unisys PCK105-SKB look unused, but one is yellowed. DATAMYTE 1000 Data Collector EECO model # TRS9200BBDED, paper tape reader, no reels. The TRS9200 is on Bitsavers.org

8 years, 1 month

Article on Gopher with Cam in it

by aek＠bitsavers.org

https://www.minnpost.com/business/2016/08/rise-and-fall-gopher-protocol They seem to have overlooked the fact that U-Minn never wanted to release control over Gopher.

8 years, 1 month

Looking for Targa 1.0 drivers

by schlae＠gmail.com

I have some old Targa 1.0 video boards (dating back to their AT&T days) but no driver diskettes. Does anyone happen to have some? I think they should work with Targa 16 drivers.

8 years, 1 month

NEC Multisync monitor manual

by Richard.Sheppard＠telus.com

> I am looking for a manual for the original NEC Multisync monitor. Mine is JC-1402 and the "User's Manual" I have is titled "MultiSync 3D". It mentions model JC-1404 but it all looks the same as mine. Is there anything in particular you need to know - or would you like a scan? Richard Sheppard

8 years, 1 month

VAX 4000 Memory?

by holm＠freibergnet.de

Hi, I have an working VAX4000/300 and I'm looking for additional memory for this machine. Has anyone left over MS-670 Memoryboards that he wants to get rid of for an symbolic price? (or compatibles, clearpoint etc...) I'm ocated in germany.. Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583 info at tsht.de Fax +49 3731 74200 Tel +49 3731 74222 Mobil: 0172 8790 741

8 years, 1 month

Microsoft DOS Fortran 5.1 graphics

by rdawson16＠hotmail.com

I am looking for a sort of 'hello world' example and/or samples to use the graphics library in this compiler, some sample code. My target is DOS and the Compaq luggable mono display. It looks like its all there, the library and include files for display adapters and modes, but I cant find an example on the netwebs to get me started. Anybody have a set of demo files or application source to study and to use this? I have TurboC running on this machine, and the graphics are great. Did Microsoft have a similar set of examples for Fortran? Randy

8 years, 1 month

IBM, Panasonic printers, Calcomp plotters, Versatec, SC08s

by useddec＠gmail.com

The following can be delivered to VCFMW or shipped: IBM 5152 personal computer graphics printer Panasonic MX-P1124 24 pin multi mode printer Several Calcomp table top plotters Versatec Unibus boards DEC SC08 Star Couplers Just looking for reasonable offers. Thanks, Paul

8 years, 1 month

Announcing VCF Pacific Northwest 2019!

by mbbrutman＠brutman.com

*VCF PNW 2019 will take place March 23-24, 2019 at Living Computers: Museum+Labs in Seattle, Washington. We had a great time last year and we are going to try to make it even better this year.Exhibitor registration is open. I am also looking for speakers and volunteers to help me run the event. It seems early but time tends to speed up at the end of the year. Getting an earlier start should also help people who need to make travel arrangements.Are you thinking about traveling from outside of the region? There is plenty to do in Seattle while you are here, including the Connections Museum, the Pacific Science Center, MoPOP, the Boeing factory tour, etc.Interested? Check out http://vcfed.org/wp/festivals/vintage-computer-festival-pacific-northwest/ <http://vcfed.org/wp/festivals/vintage-computer-festival-pacific-northwest/> for more details or send me an email.Thanks,Mike*

8 years, 1 month

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test-drb August 2018