test-drb

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101090 discussions

Set of mystery DEC boards: who can help me identifying these?

by jnc＠mercury.lcs.mit.edu

> From: Pierre Gebhardt > I uploaded some Well, I don't know what they are, but a couple of things about that first board (the one that has the 3 blue Berg headers on it): It has jumpers for UNIBUS grants (both interrupt, and DMA). Which doesn't necessarily mean much, the various MK11/etc memory cards (M7984, M8728, M8750) have them too, and they _definitely_ don't plug into a UNIBUS. But this card has nothing connected to the CDEF connector pins, but it does to the AB, suggesting that whatever it is, it might go in a MUD slot? Someplace I have the pinout for the M9014/etc UNIBUS extenders (cards that plug into a UNIBUS in/out slot, and convert it to 3 40-pin flat cables), but I can't find it at the moment (I remember discussing it here, so maybe it's in the list archives). It would be interesting to see if this card has the same pinout. Noel

10 years, 2 months

Model M Key Cap Replacement

by earl＠baugh.org

> my real IBM clicky keyboard does not have usb so I tried various usb > adapters and they could be flaky,... > you would have to start computer then have to unplug and reinsert > keyboard connection etc... > > anyone have a solve for this? thanks Ed# Yes, if you look on ebay, there is at least one person who makes cables that snap into the IBM Model M plug with USB, I believe it has some sort of in-line electronics near the plug. It's worked flawlessly with the various Model M's I've used it with (and bought some more, all work great). I used it on '86, '89, '91 ones. BTW, I can confirm that Unicomp did buy the molds, etc. from IBM/Lexmark. (spoke to the owner during a call a while ago...) The "innerds" they make are form identical to ones that came from IBM. I can confirm this in that here at work I bought the "guts" and some Mac keycaps (guts with the USB cable hard-wired... that's the only difference) And found an old Model F (which was a UK version of a model M, not sure what else was difference) and the guts dropped in. I did cut off the tabs to allow for the additional keys next to the space bar. This works out because the mold had a cross-beam where the tabs connected to the bottom edge, so you can get a smooth even edge without much cutting, etc. That's the only shortcoming I've found from Unicomp, the "enclosures" are light weight, and definitely not the same plastic as IBM (in composition or weight). So a case from a donator model M fixes that problem. (usually run the case thru the dish washer before to get it squeaky clean... yes, my wife lets me do that, as long as I'm not running dishes too... she's a keeper :-) ) Earl p.s. If you do ever order the "guts" (not sure if they still do that or not, make sure you indicate what you want on the keycaps... I didn't mention and got completely BLANK keycaps... works for me since I'm a touch typist, but had me laughing.... and I did have plenty of spare caps, so put normal ones on and have the blanks in the parts bin)

10 years, 2 months

KY11-LB drawing error

by jnc＠mercury.lcs.mit.edu

> it turns out there's an error in the KY11-LB drawings. > ... > I have 'fixed' a copy of that page from the print set, and will (soon) > issue an updated PDF. OK, I finally got a round tuit; new version here: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/MP00015_KY11-LB_Jan78.pdf (same place as the old version, now deprecated). Noel

10 years, 2 months

11/[9]4 latest

by jnc＠mercury.lcs.mit.edu

>> Unexpected trap to location 114 > Well, 0114 is the 'memory system error' vector - i.e. parity, or > un-recoverable ECC error. > ... > I'm too lazy to read the 11/94 and J-11 manuals to see what the 11/94 > has in the way of registers that record memory issues Finally found a moment to take a gander at that: The KDJ11-E memory seems to be parity only, not ECC. There's a Parity CSR at 17772100, which will tell us if a parity error was detected in the main (on-board) memory. There's also a Memory System Error Register at 17777744, but that's only there for backward compatability, and I'm not sure it will tell us much. It might also be good to look at the system CSR at 17777526, which will tell us if the firmware has set the memory size to how much memory is actually on the machine. There does not appear, alas, to be a register that indicates _where_ the parity error happened. However, if it's happening regularly (and still, as in 'problem disappeared in the process of diagnosis') we should be able to work out where it is. Although I'm still somewhat astonished that a persistent parity error wasn't picked up by the self-test on power-on. > From: Rod Smallwood > If we look at what an 11/94 is then its a single board CPU ... in a > three slot back plane. There after its UNIBUS So is there any thing we > can put in the spare QBUS slot without doing any damage? In theory, you should be able to plug most QBUS boards into those slots (although if there are QBUS cards that barf in a Q/CD slot, one couldn't use them - I can't recall if any such exist, though), but... no device board is going to work properly since the two QBUS bus grant lines (BDMG and BIAK) will be wired past those slots, directly from the CPU to the KTJ11. On the 11/84 backplane, there are a couple of jumpers that _can_ send the bus grants through the 'QBUS' slots on the 11/84 backplane (so _in theory_ one should be able to plus QBUS devices into those slots, and have them function correctly, when those jumpers are set appropriately, but we have yet to confirm that), but I don't know if the /94 backplane has anything similar. Alas, there are no 11/94 prints online (that I know of) to confirm that. > I found not one but two RXV21 RX02 controllers. So I'll give them a try > in the 11/83 and see what happens. I'll soon know if the RX02 is good > or not. Excellent! The more known good, working components we have to play with, the better! Noel

10 years, 2 months

CAPLIN CYBERNETICS HXIQ and HXIDL

by rodsmallwood52＠btinternet.com

Hi Whilst sorting through my board collection I found a pair of dual height DEC style modules. CAPLIN CYBERNETICS HXIQ It looks like a ST interface (data and control connectors). But here's the kicker. Its got a transputer chip on it. The two connectors are wired to the second board (CAPLIN CYBERNETICS HXIDL) that has what looks like a flat cable SCSI connector as output. It looks like it was made in the UK (some RS Components parts) about 1992 by the date codes. Any ideas on this one guys. Rod

10 years, 2 months

USB Keyboard Adapter (Was: Model M Key Cap Replacement)

by COURYHOUSE＠aol.com

will check it out! Thanks ed# In a message dated 6/6/2016 10:30:03 P.M. US Mountain Standard Time, halarewich at gmail.com writes: this one also works really well https://sewelldirect.com/active-usb-to-ps2-adapter $6.95 us<div id="DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2"> href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_c ampaign=sig-email&utm_content=webmail" target="_blank"><img src="https://ipmcdn.avast.com/images/2016/icons/icon-envelope-tick-round-ora nge_184x116-v1.png" height="29px" /> Virus-free. href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…" target="_blank" style="color: #4453ea;">www.avast.com _height="1">_ (mip://0c080b80/default.html#DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2) </div> On 6/6/16, Todd George <todd.george at gmail.com> wrote: > Ed: > > I've used Soarer's Mod which is built around the excellent Teensy 2.0 or > Teensy++ 2.0. I've had great success on quite a few Model M keyboards with > this mod. You can do a very clean internal mount as well on certain Model > M keyboards. > > https://geekhack.org/index.php?topic=17458.0 > > Hope this helps! > -Todd > > -----Original Message----- > Date: Sun, 5 Jun 2016 12:51:17 -0400 > From: COURYHOUSE at aol.com > Subject: Re: Model M Key Cap Replacement > >> my real IBM clicky keyboard does not have usb so I tried various usb >> adapters and they could be flaky,... >> you would have to start computer then have to unplug and reinsert >> keyboard connection etc... >> >> anyone have a solve for this? thanks Ed# > -- Chris Halarewich

10 years, 2 months

USB Keyboard Adapter (Was: Model M Key Cap Replacement)

by COURYHOUSE＠aol.com

thanks I will look at this thanks!' Ed# In a message dated 6/6/2016 9:57:48 P.M. US Mountain Standard Time, todd.george at gmail.com writes: Ed: I've used Soarer's Mod which is built around the excellent Teensy 2.0 or Teensy++ 2.0. I've had great success on quite a few Model M keyboards with this mod. You can do a very clean internal mount as well on certain Model M keyboards. https://geekhack.org/index.php?topic=17458.0 Hope this helps! -Todd -----Original Message----- Date: Sun, 5 Jun 2016 12:51:17 -0400 From: COURYHOUSE at aol.com Subject: Re: Model M Key Cap Replacement > my real IBM clicky keyboard does not have usb so I tried various usb > adapters and they could be flaky,... > you would have to start computer then have to unplug and reinsert > keyboard connection etc... > > anyone have a solve for this? thanks Ed#

10 years, 2 months

USB Keyboard Adapter (Was: Model M Key Cap Replacement)

by todd.george＠gmail.com

Ed: I've used Soarer's Mod which is built around the excellent Teensy 2.0 or Teensy++ 2.0. I've had great success on quite a few Model M keyboards with this mod. You can do a very clean internal mount as well on certain Model M keyboards. https://geekhack.org/index.php?topic=17458.0 Hope this helps! -Todd -----Original Message----- Date: Sun, 5 Jun 2016 12:51:17 -0400 From: COURYHOUSE at aol.com Subject: Re: Model M Key Cap Replacement > my real IBM clicky keyboard does not have usb so I tried various usb > adapters and they could be flaky,... > you would have to start computer then have to unplug and reinsert > keyboard connection etc... > > anyone have a solve for this? thanks Ed#

10 years, 2 months

AT&T

by sales＠elecplus.com

Who was it has the AT&T, wanted the books and disks? I just found the 5.25" floppies for AT&T for the C compiler, Pascal, etc. Maybe it was Seth? Cindy Croxton Electronics Plus 500 Pershing Ave. Kerrville, TX 78028 830-370-3239 cell sales at elecplus.com AOL IM elcpls

10 years, 2 months

Not able to post to the list

by pdaguytom＠gmail.com

Checking to see if I am now able to post to the list. Tom

10 years, 2 months

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