test-drb April 2015

test-drb@ccmp.vtda.org

182 participants
220 discussions

by dj.taylor4＠verizon.net

There is a PDP11/70 for sale on ebay, item number 331537471267 Sure is nice looking and expensive... It seems to have a lot of boards and such, but no disk drive, what gives? Disclaimer: I am not the seller, nor do I have connection. Just a gawker.

9 years, 7 months

IBM 14 inch HDA at goodwill link.

by innfoclassics＠gmail.com

Spotted on the goodwill site, a IBM 14 inch hard drive. Pretty unusual. Someone here might be interested. http://www.shopgoodwill.com/auctions/IBM-165600-Module-10SR-Mod-1-14-HDA-19… Paxton -- Paxton Hoag Astoria, OR USA

9 years, 7 months

PDP11/70 on ebay

by jnc＠mercury.lcs.mit.edu

Wow. Someone really, _really_, ***REALLY*** wanted that machine. Noel

9 years, 7 months

PDP-8/I replica kit

by oscar.vermeulen＠hotmail.com

Hi, I just completed the design of my PiDP-8, a kit replica of the venerable PDP-8/I, after exhibiting the prototypes at the VCFeX. Now, I'm gearing up to produce a batch of kits, and I'd like to collect expressions of interest in the coming two weeks.In other words, see how much interest there is, so I can determine parts volume and exact cost. -> Kit will cost no more than $135, hopefully a bit less (depends on volume!)-> Shipping will be $30 worldwide, as registered parcel with tracking -> Expected shipping date is mid-July, payment required only when kits are done-> Expression of interest means you're not committing to buy now, just indicate you're very likely to buy in early July. For details, here is a short Youtube demonstration:https://www.youtube.com/watch?v=5hyUActgT2E If you are (seriously) planning to buy the kit, please add your name to the mailing list via the box on this page and I'll update you on progress:http://obsolescence.wix.com/obsolescence#!pidp-8-get-one/ctny If you already got an email from me today (or you registered your interest just today), then you're already on the list - in which case please ignore this message. Regards, Oscar.

9 years, 7 months

Resolved: Re: 11/34 sanity check

by jnc＠mercury.lcs.mit.edu

> From: Josh Dersch > it never occurred to me to just try flipping it around since usually > that's a pretty good way to let the magic smoke out of things. Exactly. Except for cases where I _know_ the connector was designed to be able to withstand being plugged in backwards (e.g. IDE), I would _never_ try reversing a cable 'on spec'. The chances are just too big one will kill something. (Amusing factoid: QBUS cards have the same thing, they are designed so that you can plug them in backwards, and not kill things. I am somewhat ashamed to admit that one one occasion, I actually did this! Luckily the engineer who did the QBUS saved my behind.) > From: Johnny Billquist > On 2015-04-27 00:50, Mike Ross wrote: >> One does not casually reverse the installation of cables just to see >> if maybe it will work! > Actually.... I often have done so, just because of this. And how many times have you melted something down, doing that? :-) Noel

9 years, 7 months

IBM 370 Mainframe Operator Control Panel on eBay

by jnc＠mercury.lcs.mit.edu

Here: www.ebay.com/itm/181726343378 Alas, it's 'Local pick-up only', in Portland, Oregon, but there may be someone here out there who's up for it. Noel

9 years, 7 months

VK170 M7142 Serial Video Board

by jws＠jwsss.com

I have a friend preparing to bring one of these up in a small system (2 wide) backplane with an M7676 standalone pdp 11 card. Anyone have any experience with configuring these? Looks like the monitor is going to be a 9" Ball brothers monitor, not sure what else. Documentation is plentiful, but options are also complex, so someone who has one working, or any experience would be welcome to comment. thanks Jim

9 years, 7 months

M9301-YB Bootstrap/Terminator ROM dumps / listings?

by jnc＠mercury.lcs.mit.edu

> From: Jorg Hoppe > I also have a spare DL11-W to offer Josh, if you want a second serial line, it's best to use a regular DL11 (M7800), not a DL11-W. (M7800s are available on eBay, for pretty modest amounts.) The reason is that each DL11-W presents a load on the line clock signal (from the power supply), even if the line clock on the second board is disabled; several Dl11-W's, and the line clock signal may get overloaded. > From: Josh Dersch > I need to scare up a second SLU so I can get an emulated TU-58 hooked > up to try booting XXDP I'm not sure any M9301 variant supports the TU-58? Some are set up to boot over the console serial line, though. (I haven't yet checked the code, so I don't know whether you need to feed it the absolute loader first, or if it will just take .LDA files directly.) And I just realized you're working with a -YB, and I've been dis-assembling the -YA! Fat lot of use that would have been! Oh well, I assume the code is fairly similar, I'll do the -YB next. (Anyone have a dump, to start me off?) > comparing the diagnostic/console PROM listings to what I have Where were those from? Thanks in advance... > From: Henk Gooijen > I could be wrong, but ISTR that in the first few words of a ROM are the > two capitals of the boot device that the PROM supports. Not in the M9301-YA, in either bank. Noel

9 years, 7 months

ACT and CMI Unibus boards

by shadoooo＠gmail.com

Hello, just received some Unibus boards, some are from ACT, one from CMI. I would identify these boards. The first is a big hex board, marked ACT 10046: on front side has two 50pin connectors, plus two female edge connectors on the left side (some sort of narrow bus extender?). There are some resistive terminators onboard near one of the 50pin connectors. Very strange board... The second is a quad board marked ACT 10039: it has four 40pin connectors, two on front and two on a side. The last is for sure a RAM board, as it includes an array of 16x9 HM4716 ICs, with a total of 128KW. It's from CMI ON 207-010-300 and it has a lot of wire-wrap jumpers for configuration. Anybody has some knowledge over these boards? Thanks Andrea

9 years, 7 months

PDP11/70 on ebay

by jnc＠mercury.lcs.mit.edu

> From: Mark J. Blair > I may be able to do that if A) it's still there in a couple weeks It won't. There are already two bids on it. Noel

9 years, 7 months

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test-drb April 2015