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Reading HP 16500 Logic analyzer firmware disks

by shadoooo＠gmail.com

hello, I have a 1662a, any chance to get the suitable floppy images? Many thanks for the help. Andrea

11 years, 11 months

Reading HP 16500 Logic analyzer firmware disks

by marc.verdiell＠gmail.com

Thanks so much Glen. Indeed, I found the INVASM.ZIP in the HP16500 folder https://groups.yahoo.com/neo/groups/hp_agilent_equipment/files/HP16500%20Ser ies/ Will this work also for the 1670G? No HP-IB inverse assembler in there, so your diskette copy would still be very valuable. Is the 1670G still using LIF or does it read DOS format? Marc >There is INVASM.ZIP in the files section of the HP/Agilent Test >Equipment group. >https://groups.yahoo.com/neo/groups/hp_agilent_equipment/info

11 years, 11 months

Problematic spade lug in power supply

by jnc＠mercury.lcs.mit.edu

OK, next! As I mentioned, I have two systems I'm working on, and I'm starting with the 11/23. It uses a Sigma BA11NL-1 chassis - very similar to the DEC chassis of the similar id. (Speaking of which... the chassis was in a box with a DEC "11L03-HA" label on it - I can't work out if whoever owned it upgraded it with the Sigma [which is Q22] or if DEC supplied the unit with the Sigma. I can't work out why DEC would have used an outside supplier for that - unless either i) Sigma could build a chassis much cheaper than DEC could, or ii) DEC was having supply issues, and turned to Sigma to fill the gap.) Anyway, so I've had it apart, and it's generally in very good condition... with this exception in the power supply: http://ana-3.lcs.mit.edu/~jnc/jpg/PDP11s/SigmaBurnedConnector.jpg This spade lug appears to be the +5V common, although I'm too lazy to check the prints to absolutely confirm that (there are two other similar wires coming out of the transformer, but without the white stripe of this one, and they both go to a honking great full-wave rectifier, the output of which goes to a heat sink (!) which appears to be doing double duty as a bus bar). Clearly, there was probably excessive resistance there somewhere, although it's not clear if it was across the spade connector itself, or in the wire-connector junction (note the brown spot on the insulating shield - I first thought that indicated that the wire-connector joint was the problem, but iff the spade connector got hot enough, the heat could have gotten into the wire, and caused that spot). So here's my question: what do I do? Do I: - Pull the spade connector off, clean everything well (e.g. with a Dremel wire brush), and put it back together, and hope? - Replace the connector on the wire side only (slightly tricky, as there's not much spare length in the harness, so I can't clip it off, I'd have to cut the old one off with a Dremel wheel)? - Try and replace the lug on the board too? (It looks like it got hot enough to melt the solder - the solder has the surface crazing to it.) That might be tricky... - Do nothing and hope (on the basis that it didn't melt down yet :-)? Whatever I do, of course, I should monitor it, and I'd like to avoid a lot of grief replacing things unless I really need to, but I'm genuinely uncertain what the best course is here. Thoughts? Noel

11 years, 11 months

National Semiconductor IMP-8A Instruction Set

by bkotaska＠charter.net

Have a board here with subject chip on it. Also has 2 IMP-00A's. I assume what I have is the 8 bit version of the IMP-16. Haven't been able to locate instruction set for this 8 bit version. All the data sheet says is "CROM's which implement 8-bit instruction sets are available as standard products." Seems to be lots of info out there for IMP-16 but anyone heard of this IMP-8A/521D? Thanks, Bill

11 years, 11 months

fuse madness

by jules.richardson99＠gmail.com

Well, they do say that the device is there to protect the fuse... http://www.classiccmp.org/acornia/tmp/fuse.jpg Found in the chassis of an old 'scope. There's actually originally no provision for a fuse in the 'scope itself - just a circuit breaker - but quite why someone would take the trouble to cut a wire and then solder both ends of the same fuse to it, I have no idea. cheers Jules

11 years, 11 months

Source for 2.54mm 40-pin connector shells

by jnc＠mercury.lcs.mit.edu

> From: Chuck Guzis <cclist at sydex.com> > Do you mean something like the 2.54mm dual-row "Dupont" connector > shells taking crimp pins? > e.g. eBay 330875532644 Yes, that's it! How on earth did you find that? I looked on eBay (and then Googling) for several hours, and couldn't!! :-) > Paul Anderson <useddec at gmail.com> > Do you need ones like used on the M7800 (DL11) and KL8? > I have 20ma cables for these Thanks; those are indeed the kind/size I'm looking for (quite a few DEC boards use them), but I think I'm set now (above). > John Wilson <wilson at dbit.com> > the housing is technically 44 positions because it goes all the way to > the edges, but the DEC connectors (like the IDC ribbon-cable > connectors) skip the outer pairs so you only ever use the middle 40 > pins out of 44. Interesting... I have a cable with 40-pin connectors (on an old IDE cable; these are not keyed) and I tried plugging it in, and there is no space at all on the sides (unlike, say, when one plugs a 10-pin shell into a 14-pin DLV11-J connector). But looking at the connector carefully, I see that the side arms of the top retainer piece take up space on the sides - looks like just enough for a pin. So maybe the '40 pin' Berg headers really are technically 44 pin size (although they do have only 40 pins). Speaking of keying... does anyone know the name (let alone a source) for the little plugs (usually white) that can go into one of the holes on one of those connector shells, to key it so it can only go in one way round? Thanks everyone, for all for the help! Noel

11 years, 11 months

Source for 2.54mm 40-pin connector shells

by jnc＠mercury.lcs.mit.edu

> From: Tothwolf > So was DEC using both AMP AMPMODU and Berg connectors for the cables? Yup - and others as well - although seemingly not on the same board type, though. Pretty much all the 40-pin connectors I can see here (one a large range of board types) have Berg on them (although it seems DEC was making the part themselves under license, because all except one _also_ has a "|d|i|g|i|t|a|l|" logo on it too); there is one DuPont. The non-DEC Berg and the DuPont are absolutely identical except for the logo - and are on a pair of cards which use them for an over-the-back connection, so I suspect they are the same part, just re-labeled. The 50's a a mix of Berg and 3M. There are 20's which are Berg. The ones on the DLV11-J's (the one they gave the AMP part numbers for) aren't marked, nor are a number of the other small ones. Noel

11 years, 11 months

Source for 2.54mm 40-pin connector shells

by jnc＠mercury.lcs.mit.edu

> From: Tothwolf > FCI bought out Dupont's connector division a long time ago, so what you > are looking for is FCI's Mini-PV series. > ... > I'd advise against buying these type of contacts on eBay. 99% of the > "Berg" or "Dupont" contacts on eBay are knock-offs and don't have > decent plating (gold flash, if they have any gold on them at all) and > aren't made to have the correct gripping force. .. they might not even > fit a real HT-95. Hi, thanks for all that great info. The 'gold flash' issue was new to me; for those who are likewise unfamiliar with it, I found this nice write-up: http://www.dfrsolutions.com/uploads/white-papers/Gold_Flash.pdf Alas, I've already ordered some of the 'eBay knockoff' pins; when they get here, I will look them over, and if poor quality, take appropriate action... > From: John Wilson > Digikey 3M9123-ND (3M 3435-0 "conn socket keying plug") is the version > that fits into an IDC connector. By pure chance, I later discovered, as I was reading the writeup on the DLV11-J, that they gave AMP part numbers for the shell (10-pin, I assume), contacts, and plug (they call it a "key pin"), and they seem to still work. Here they are, if anyone has any use for them: 87133-5 Connector shell 87124-1 Contact 87179-1 Keying pin How odd to find them in the DEC Interfaces Handbook! Noel

11 years, 11 months

RTEM-11

by pontus＠Update.UU.SE

Hi I've found an old binary for the original TETRIS called TETRIS.SAV. I believe it is a runnable binary made for RT-11 orginally run on of the russian PDP-11 clones. Now, I would like to run this under RTEM-11 on RSX-11M+, since that is what I have available. But I find very little documentation and I have no real idea how RTEM-11 works. Does anyone here with any experience want to give me some pointers? Simply, what do I do with an RTEM-11 installation and TETRIS.SAV? Assume no or little knowledge on my side :) /P

11 years, 11 months

Source for 2.54mm 40-pin connector shells

by jnc＠mercury.lcs.mit.edu

Hey, all, I'm looking for a source for 40-pin connector shells (to hold female pins) for 2.54mm so-called Berg or Du Pont connectors. Anyone have a source they can point me at? (I would call these male shells - since they go into the female shells with male pins typically found on circuit boards - but I gather the terminology is somewhat confused.) The small ones (1-10 pins) are easy to find (they are used for audio/USB connectors); the 40-pin females for use on ribbon cables are also easy to find, as are the males that go into PCBs... but the 40-pin insertable pin females appear to be unobtanium. (I want them because a number of old DEC interface cards use them for cables, and I refuse to pay $139 or whatever for a cable that's made of a total of a couple of bucks worth of parts - I'm quite happy to roll my own.) BTW, to quickly introduce myself (since this is my first message to the list); I did a lot of work with PDP-11s 'back in the day', both as a software development environment (using PWB Unix - roughly V6 - and later Ultrix), as an application platform (multi-protocol routers, using LSI-11s), and also some prototyping of high-speed network interfaces (1 and 10 Mbit/second rings). I now have a couple of 11s (a 23 and an 84) which I'm trying to get running. You'll be hearing lots more from me Real Soon Now as I get into that project... :-) Noel

11 years, 11 months

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