test-drb

test-drb@ccmp.vtda.org

101090 discussions

by blstuart＠bellsouth.net

On Fri, 12/15/17, Ethan Dicks via cctalk <cctalk at classiccmp.org> wrote: > On Fri, Dec 15, 2017 at 1:49 PM, systems_glitch <systems.glitch at gmail.com> wrote: > > It's on my list of things to do -- you can run external clock into DL11 and > > DLV11-J style connectors, and IM6402 UARTs are supposed to go up to 2 mbit, > > so somewhere between 38400 and 2 mbit should be possible. > > A side-effect of modding the DLV11J could be high-speed TU58 emulation... The LSI-11 I had at last spring's VCFs did that with a little home-brew 6809 board I was using for TU58 emulation. I wasn't going into a DLV11 per se, but into an MXV11. I'd have to go back and look at the details to see how fast it was actually running. Somewhere in the back of my mind, I had to back off a little bit on what the hardware could do because something on the software side couldn't take it that fast. BLS

8 years, 8 months

Help Identifying Components

by shadoooo＠gmail.com

Hello, while I can confirm that the bigger black with two pins is a diode, I'm not sure what kind of diode it is, as it could be bipolar, Schottky or Zener. About the smaller black components with three pins, they could be transistor or diodes (single or double, with common cathode, common anode or series). I will try to find a correspondence for the markings, but symbols are someone strange, so a clear macro picture would be better... Andrea

8 years, 8 months

Help Identifying Components

by robert.jarratt＠ntlworld.com

I am continuing work to reverse engineer the schematic for my H7826 PSU. I have removed one of the daughter cards in order to draw its schematic, but I can't identify some of the surface mount components on it. I have posted a picture of it here: https://rjarratt.files.wordpress.com/2017/12/50-19530.jpg The ones I can't identify are: 1. The component with two wide pins that looks like an IC approximately in the middle of the board. It is marked M106 (or it might be AA106) and 91813 underneath. I think it may be a resistor, but I am not sure. 2. Just to the right of this is another much thinner two-pin component which is black on top with a kind of white notch. I have no idea at all what this is. 3. The three 3-pin black components to the left of the first component. Two of them are marked "2T L" (or is that "ZT L"?), one appears to be marked "2X I" (letter "ih", not letter "el"). I guess they are transistors, but they may not be of course, and I don't know their pinout. Any help with identifying what these are would be very helpful. Thanks Rob

8 years, 8 months

Restoring a VT50 (VT52 actually) .

by mattislind＠gmail.com

I have started to work on a getting VT50 terminal back to life. When digging into it I recognze quite immediately that someone had done a brain transplant on it. It has VT52 boards in it! Was this a usual procedure? The VT50 to VT52 shift looks like a failure of DEC at the time. So close in time. But different board sets inside. They could have designed a board with RAM upgrade possibility and just a new microprogram? Looks strange to me. When the VT52 got on the market I guess it was hard to sell any VT50s or was there a substantial price difference? Anyhow, the VT52 boards are dead. They generate the proper sync signals but there are no keyclick generated when pressing keys on the keyboard. Which is quite normal since the sync is generated by a chain of counters while the keyboard is controlled by the microprogram. The terminal uses 4 pieces of 256 by 4 bipolar PROMs for a total of 512 bytes of microprogram. Has anyone dumped the contents of these so I could verify them?

8 years, 8 months

FS: New-Old Stock S-100 Kits: Cromemco Dazzler & ZPU, IMSAI FIF-XA, PT VDM-1 & more!

by sellam.ismail＠gmail.com

Hello again, Folks! I came across a pretty amazing find in my stuff that I didn't even know I had and have no recollection from where I got them. It's a box of unbuilt S-100 board kits. Some of the kits are complete (board, parts, documentation), others might be missing the documentation or components. And then I have a bunch of bare boards, including a fair number of prototyping boards. I created an unboxing video, which can be watched here: https://www.youtube.com/watch?v=3gGgX3WPK34 Complete information including links to photos and pricing can be found here on my new dedicated S-100 sales thread on the VCFed forums: http://www.vcfed.org/forum/showthread.php?61192-Sellam-s-S-100-Hardware-Sof… Scroll down to the third post for the newly posted S-100 kits. Please inquire directly to me via e-mail for fastest results. Thanks! Sellam

8 years, 8 months

Searching for manual for ADAC 1664ATTL output pulse board

by aaron＠aaronsplace.co.uk

Does anyone have a copy of the manual for the ADAC 1664ATTL 64bit parallel I/O Q-bus card? Thanks, Aaron.

8 years, 8 months

Miss categorized DEC box on ebay

by bobalan＠sbcglobal.net

PDP 11/03? LSI-11? Maybe someone can use it. Nice blue color. https://www.ebay.com/itm/VINTAGE-DIGITAL-INSTRUMENTS-COUNTER-HG-ELEMENTS/30… Bob -- Vintage computers and electronics www.dvq.com www.tekmuseum.com www.decmuseum.org

8 years, 8 months

Miss categorized DEC box on ebay

by jnc＠mercury.lcs.mit.edu

> From: Bill Gunshannon > At best, it's a third part QBUS box. I assume that was 'third party'? No, that's a real DEC front panel. They could have put that on an off-brand chassis, but I would _guess_ not. (The outer housing I can see looks like the slide-in ones DEC used to hold the BA11-N/BA11-S, but I don't recall what the housing for the BA11-M's looked like.) For some reason the BA11-M's seem to have been going for more than the BA11-N's. Dunno why, maybe the original LSI-11's have some sort of appeal? Noel

8 years, 8 months

Found another one...

by cclist＠sydex.com

Discovered a Z-World "Tiny Giant" SBC220D development board. Seems to work; if powered on, the LED blinks. Its a Zilog Z180 board--and I can't remember a thing about it other than playing with it a bit. Yours for shipping (it's about 5x6") and should fit in a USPS small FRB. ------------------ While I'm at it, any interest in Neoware thin clients? I've got a few; they're set up for CF card as hard disk, but most have 5GB microdrives installed. How about 3-button serial mice? Cheers, Chuck

8 years, 8 months

DEC indicator panel mounting details

by jnc＠mercury.lcs.mit.edu

> From: Adrian Stoness <tdk.knight at gmail.com> > theres a 3d model for printing those brakets over on this site > http://so-much-stuff.com/pdp8/cad/3d.php http://www.classiccmp.org/pipermail/cctalk/2017-December/036544.html Noel

8 years, 8 months

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