More VT52 HV

So, having pulled the CRT now , I was surprised to see that the ground braids seem to be held against the aquadag by only the pressure from a couple foam blocks! In my unit these aged foams are deformed and brittle. This would seem a good thing to add to the check list for looking at these…

Re: DEC VT52 CRT anode connection

> On Feb 20, 2022, at 10:27 PM, Fritz Mueller wrote: > I’ve begun some work on a VT52 ... is there a way to detach the HV anode lead > at the board side (does the white “cap” come off the lead connector?) Well, just answered my own question — went back and tried to be a little more

DEC VT52 CRT anode connection

Hi folks, I’ve begun some work on a VT52, and need to get the power supply board out onto my bench for some work. For those who have been in here before: is there a way to detach the HV anode lead at the board side (does the white “cap” come off the lead connector?) Or is the only option to

Re: rotron caravel fan used in DEC and other cabinets

Hi Paul, At first I have replaced the bearings in the original two 10" fans in the top of my LAB-8/e rack hoping to reduce the noise substantially. The new bearings did not noticeably improve the noise levels. After a few days of suffering through the noise I decided to replace them with modern

Re: rotron caravel fan used in DEC and other cabinets

I'm sorry, I meant info on rebuilding, bearing replacement and sources for bearings. That's what I get for sleep typing at 4:30. Thanks, Paul On Sun, Feb 20, 2022 at 4:33 AM Paul Anderson wrote: > Does anyone have a video or printed procedure they can send me or point me > somewhere that

Re: rotron caravel fan used in DEC and other cabinets

On 2/20/2022 5:39 PM, Don R wrote: You might also consider All Electronics: https://www.allelectronics.com/index.php?page=seek%5Bm%5D=pattern%5Bq%5D=Fan Maybe I missed them, but I didn't see anything big enough

Re: rotron caravel fan used in DEC and other cabinets

You might also consider All Electronics: https://www.allelectronics.com/index.php?page=seek%5Bm%5D=pattern%5Bq%5D=Fan Don Resor Sent from someone's iPhone > On Feb 20, 2022, at 5:12 PM, Vincent Slyngstad via cctalk > wrote: > > On 2/20/2022 4:34 PM, Noel Chiappa via cctalk wrote: >> >

Re: rotron caravel fan used in DEC and other cabinets

On 2/20/2022 4:34 PM, Noel Chiappa via cctalk wrote: > From: Vincent Slyngstad > I had to replace one of those recently Where did you source the replacement? I need a few. Thanks! I may be wrong, but from what I could tell these are bog standard 10 inch blowers of a sort used in

Re: VAX9000 unearthed

On 2/20/22 14:31, Chuck Guzis via cctalk wrote: On 2/20/22 10:10, Mark Kahrs via cctalk wrote: I heard Butler Lampson once exclaim that ECL design was in some ways easier than TTL. If you terminated every line, you get controlled impedances with controlled edges. This was the design

Re: rotron caravel fan used in DEC and other cabinets

> From: Vincent Slyngstad > I had to replace one of those recently Where did you source the replacement? I need a few. Thanks! Noel

Re: Is The M9312 Boot Module Essential?

> Neither the KD11-E nor the KD11-EA has built-in termination and pull-ups > ... I haven't yet checked, but it may be the only PDP-11 CPU of which > that is true Also the KD11-D of the -11/04. Noel

Re: rotron caravel fan used in DEC and other cabinets

On 2/20/2022 2:33 AM, Paul Anderson via cctalk wrote: Does anyone have a video or printed procedure they can send me or point me somewhere that could help? Are we talking about the 10 inch fan at the top of the rack? I had to replace one of those recently, but it wasn't very difficult.

Re: VAX9000 unearthed

On 2/20/22 15:31, Chuck Guzis via cctalk wrote: On 2/20/22 10:10, Mark Kahrs via cctalk wrote: I heard Butler Lampson once exclaim that ECL design was in some ways easier than TTL. If you terminated every line, you get controlled impedances with controlled edges. This was the design

Re: VAX9000 unearthed

On 2/20/22 10:10, Mark Kahrs via cctalk wrote: > I heard Butler Lampson once exclaim that ECL design was in some ways easier > than TTL. If you terminated every line, you get controlled impedances with > controlled edges. This was the design philosophy for the Dorado. Indeed--ECL WW prototype

Re: Is The M9312 Boot Module Essential?

So, I've made what I think is a significant discovery about the -11/34: > 1B _is_ necessary, but can be provided anywhere on the bus; most > UNIBUS/QBUS CPU [pullups] have it built in I was wrong. Neither the KD11-E nor the KD11-EA has built-in termination and pull-ups (those are both

Re: VAX9000 unearthed

I heard Butler Lampson once exclaim that ECL design was in some ways easier than TTL. If you terminated every line, you get controlled impedances with controlled edges. This was the design philosophy for the Dorado.

Re: SGI Indigo keyboard / mouse / converter wanted

There was a converter a few years ago that went from 'onyx' to PS/2. That seems to have vanished from ebay. I have some and they say "CKCOMPUTERSYSTEMS" on them - perhaps your friend can chase that down. The Drak goes to USB which may be better or worse than the CK adapter depending on your

Re: SGI Indigo keyboard / mouse / converter wanted

On 2/20/22 10:36, Andrew Diller wrote: Indigo1 is not PS/2, even though the connector looks that way. Correct. I was just pointing out that I think I recall someone years ago implementing a converter between the Indigo's proprietary protocols and "modern" (at the time) PS/2 keyboards/mice -

Re: SGI Indigo keyboard / mouse / converter wanted

Indigo1 is not PS/2, even though the connector looks that way. You need to have the "onxy" keyboard/mouse or get an adapter from Drakware. Plugging in a PS/2 device will harm the SGI and or the keyboard. https://www.drakware.com/shop/p/indigousb You

Re: SGI Indigo keyboard / mouse / converter wanted

Jules, I don't have a solution, only the same problem, but with a Tektronix 4200 series graphics terminal. Keyboards are rare, there is one on ebay for $700, yikes! However, I do have 2 of these terminals and one working keyboard.  Was starting to go down the path of intercepting the startup,

Re: SGI Indigo keyboard / mouse / converter wanted

I think the Wombat adapter would work (?) On Sun, Feb 20, 2022 at 10:46 AM Jules Richardson via cctalk < cctalk@classiccmp.org> wrote: > > Hi all, > > A friend of mine has just acquired an Indigo (R4k with XZ graphics > option), > but of course it's the usual story and the keyboard/rodent had

SGI Indigo keyboard / mouse / converter wanted

Hi all, A friend of mine has just acquired an Indigo (R4k with XZ graphics option), but of course it's the usual story and the keyboard/rodent had been lost. In absence of the genuine items they'd still be happy with a USB converter (at least for the time being), but it seems those are

rotron caravel fan used in DEC and other cabinets

Does anyone have a video or printed procedure they can send me or point me somewhere that could help? Thanks, Paul