test-drb June 2016

test-drb@ccmp.vtda.org

196 participants
290 discussions

by curiousmarc3＠gmail.com

Can anyone identify this HP board (see link to pictures)? https://goo.gl/photos/BBuAV1oozWNSqeUTA It was at under the main board of a newly acquired HP 1000-E, next to the firmware board. It says HP 54427-60050 Booster Microcode. It has 5 bitslice SN 74S181 chips at the back. So I surmise maybe it's a late ALU booster upgrade? Marc

8 years, 2 months

Monitor refresh rate query

by jnc＠mercury.lcs.mit.edu

> From: Peter Corlett Hi, thanks for helping me out here! > Both are correct. There are 44 (rounded) frames per second, and 87 > (rounded) fields per second. "fields per second" refers to interlaced displays, right? So the vertical retrace frequence there is the 87 Hz number (since you get a vertical retrace after only 768/2 lines are displayed). Or am I confused? Although if I'm right so far, I'm puzzled as to how one could drive both interlaced and non-interlaced monitors off the same video signal - wouldn't the interlaced one need a video signal which has 'odd lines, then a vertical retrace, then even lines, then a vertical retrace'? Anyway, so which one is the one which is the number to look at when considering if the refresh rate is so high it might be dangerous to an old CRT monitor? I would assume it's the 'fields per second', since that's the frequency of the vertical retrace? E.g. my HP M50 manual says "Setting the screen resolution/refresh rate combination higher than 1024x768 at 60 Hz can damage the display." Even though the same document lists the vertical frequency range as "50-100 Hz"! Noel

8 years, 2 months

Searching an IBM Model B typewriter for IBM 1620

by johannesthelen＠hotmail.com

I got just another jewel to my collection, IBM 1620 Model I (G level). Machine has all internals intact, but table top and the typewriter are missing (probably doorway was too narrow back then, parts removed and forgotten somewhere on the journey... ) That table top can be made again, but I would need that right model typewriter. Anyone have a spare..? Also I have another problem with it, memory is suffering wire corrosion (like these all does). So this can be a looooong shot, but if someone have a functional memory or just core array, I'm interested to buy or swap it to something. Photos can be found my blog, link below. Thaaaaanks! - Johannes ThelenFinland Before microcomputers blog (Finnish) http://ennenmikrotietokoneita.blogspot.fi/

8 years, 2 months

Quadra 660AV what's with the "PowerPC" label?

by blstuart＠bellsouth.net

On Thu, 6/16/16, Sean Conner <spc at conman.org> wrote: > It was thus said that the Great Liam Proven once stated: > > And Plan 9 went one better, and (mostly) eliminated that nasty old > > unsafe mess, C, and it eliminated native binaries and brought > > platform-neutral binaries to the game. > >? Um ... what?? Plan 9 is written in C.? And they still use binaries, just > fat binaries (that is, the binary contains multiple code and data segments > for each supported architecture0). I suspect he was referring to Inferno when talking about the byte code executables. But Plan 9 doesn't use fat binaries. It keeps each architecture's binaries in a directory named for the architecture. Then one uses the union mounts to build a /bin that has the appropriate mix of binaries and shell scripts for the machine hosting that process. BLS

8 years, 2 months

DL11 M7800

by jnc＠mercury.lcs.mit.edu

> William Degnan > Update: I now have .. a working .. DL11 (M7800) What did the problem turn out to be (or is this a different one)? If the latter, do you have any use for a 5-instruction 'scope loop program which sends characters continuously, which you can toggle in, to help debug the broken one? If so, let me know, and I'll verify that it works (I hand- assembled it in my head :-), and send it along. And Ethan, thanks for the tip about that old message! (I'd forgotten about that one!) I will upload the content to the CHW (and add the DB9 pinouts, too). Noel

8 years, 2 months

Eckert - Faster, Faster; books in general

by jnc＠mercury.lcs.mit.edu

> From: Brian Walenz > My (ex-library) copy is missing all of chapter 11, "What is there to > calculate?. (And the last page of the previous chapter). The pages > weren't ripped out, they were missing when it was bound. Very odd. My copy is complete, so if you can't otherwise locate the missing content, I could scan those page for you. They cover: i) multiple simultanous linear equations with unknowns (the problem the ABC was created for), ii) ordinary differential equations such as ballistics calculations (ditto, the ENIAC), iii) partial differential equations, such as fluid dynamics, although the example he uses is from quantum mechanics. > Two, also ex-library, copies are listed on Amazon, and I hesitate to > get another copy with the same problem. You could contact the seller and ask them to check, specifically. > There are others, of course, at outrageous prices. Or maybe I don't > realize the significance of '1st edition, not ex-library'. Well, it say what it means: it's a first edition - some collectors prefer them; and it doesn't have all the stickers, glued-in paperwork, internal markings etc that one finds in a library copy. Collectors often find that annoying - I tend to stay away from ex-library copies unless there's a huge price difference. > Just to make any discussion a bit more interesting, what would you > suggest along similar lines? Oh, goodness, there's a long list. I'll put up an annotated bibliography on the Computer History wiki. > From: Pontus Pihlgren > What are the titles of the IBM books that of which you speak? They are: Charles J. Bashe, Lyle R. Johnson, John H. Palmer, Emerson W. Pugh, "IBM's Early Computers", MIT Press, Cambridge, 1986 Emerson W. Pugh, Lyle R. Johnson, John H. Palmer, "IBM's 360 and Early 370 Systems", MIT Press, Cambridge, 1991 Both are excellent, as are: Emerson W. Pugh, "Memories That Shaped an Industry: Decisions Leading to IBM System/360", MIT Press, Cambridge, 1984 Maurice V. Wilkes, "Memoirs of a Computer Pioneer", MIT Press, Cambridge, 1985 >from the same series (the former covers the development of core memory from the perspectiv of IBM). Noel

8 years, 2 months

DL11 M7800

by billdegnan＠gmail.com

OK. I must be missing something here Does anyone have a M7800 (DL11) set for 9600 b N71 or N81 jumper'd with the default address for use as a serial terminal interface? I understand the other jumpers on the card, but the address and vector jumpers confuse me. I can't seem to find a table or a "here is the default for console" or I don't get it. I have the manual, I want I believe 777560, but I cannot find "table 5-2" referred to in my copy of the manual. Can someone give me a couple of examples "if you have Ax Ay Az connected then that represents address ------- . I am looking at the manual and web sites on the subject and I think for use as a simple serial terminal interface I need to jumper "in" *A9, A7, A5, A4, A3* ... correct? Vector jumpers *V6, V7 "*in" . Just curious if anyone can help me specifically not indirectly what I need, super thanks in advance. Thanks Bill -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>

8 years, 2 months

Want to trade: Complete MacIvory 2 system for standalone Symbolics XL machine

by ian.finder＠gmail.com

If anyone has standalone Symbolics hardware, and wants to trade for something more managable that can do an LCD display and uses more standard parts, I have the following system for trade for any Merlin / XL machine. I'm going all-in on wacky hardware, because I have multiple machines and already require lots of unweildly consoles. In particular, with one running XL, I want to double down for spare parts. Going by the last few eBay auctions, the value is identical, or even slightly skewed in favor of the MacIvory. Here's what it's kitted out with: > Mac IIfx host > Original Symbolics Keyboard / Mouse adapter > MacIvory II CPU with Floating Point Accellerator > NS 8/16 NuBus Memory > CF card for booting the Mac side > 36gb internal SCA drive for the FEP filesystems > NuVista color card (this can be used directly by S-PAINT, and S-GRAPHICS as a color render head) > Radius ThunderGX accellerated NuBus main graphics > Asante 10 megabit ethernet > Compatible CD-ROM drive > Genera 8.3 & Animation systems loaded Anyone interested in a smaller, friendlier Symbolics experience? Will also consider funding any cross-shipping myself. Cheers, - Ian -- Ian Finder (206) 395-MIPS ian.finder at gmail.com

8 years, 2 months

Hazeltine 2000 Manuals

by dfnr2＠yahoo.com

Hi all, These Hazeltine 2000 were just on Ebay and were quickly snatched up.=C2=A0 = Did anybody here happen to snag them? http://www.ebay.com/itm/272275536298 http://www.ebay.com/itm/282069468875 I've been looking for these manuals for some time.=C2=A0 If someone won the= m (or has a set), I wonder if you'd be willing to create some nice high-qua= lity scans.=C2=A0 I'd be willing to pitch in to cover the costs of scanning= large pages, etc. with high resolution.=C2=A0 Alternatively, if anyone has= similar manuals and would be willing to sell them, I'd be interested. Thanks for any info! Dave

8 years, 2 months

DLI/Dolch C-100D Manuals?

by holm＠freibergnet.de

Hi, I've shoot an DLI / Dolch Logic Instrumnets Logic Analyzer Type C-100D on ebay today. It seems that I get some pos too, unfortunately no Z80 personality ..but a lot standard Pods. Since there are no Manuals for it included in the auction I'm asking nicely here if someone has the paperwork for this LA preferable in machine readable form ..? Has someone a z80 Personality to sell? TIA, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583 www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741

8 years, 2 months

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test-drb June 2016