Re: VAX 4000 PSU (H7874) Schematics
There is a guy named at Joel from global-itcorp.com who has experience with these, he may have an idea. Tell him you spoke with Bill Degnan. b On Thu, Jun 7, 2018 at 3:49 PM, Aaron Jackson via cctalk < cctalk@classiccmp.org> wrote: > I am trying to repair a VAX 4000 power supply. Does anyone have the > schematics? I can't find anything on BitSavers and I'm not completely > convinced it was even designed by DEC. > > The VAX turns on and the status LED stays on F. The DC lamp does not > illuminate on the PSU. 5V rail appears fine but there is nothing from > the 12V rail. There were some *very* dodgy looking caps which I have > replaced, and some *very* exploded MOSFETs, which I have also > replaced. > > If anyone has schematics, or know where I might find them, it would be > much appreciated. > > Thanks, > Aaron. > >
VAX 4000 PSU (H7874) Schematics
I am trying to repair a VAX 4000 power supply. Does anyone have the schematics? I can't find anything on BitSavers and I'm not completely convinced it was even designed by DEC. The VAX turns on and the status LED stays on F. The DC lamp does not illuminate on the PSU. 5V rail appears fine but there is nothing from the 12V rail. There were some *very* dodgy looking caps which I have replaced, and some *very* exploded MOSFETs, which I have also replaced. If anyone has schematics, or know where I might find them, it would be much appreciated. Thanks, Aaron.
Re: CDC 6600 display character generation
> This reminds me of every TV show and movie I've seen where consoles begin > exploding on a space ship during a battle. All of this time, I thought that > was entirely a Hollywood fabrication! Given all the jenky engineering in the tube circuits inside a DD60, I am surprised more of them did not get all sparkly. -- Will
Re: CDC 6600 display character generation
> On Jun 6, 2018, at 11:50 PM, Rick Bensene via cctalk > wrote: > > Believe me, the console did spit out a lot of sparks and little blobs of > molten metal, along with quite a bit of smoke. I still have a small > scar on my left leg where one of the little blobs of metal burned me > after burning through the material of my slacks. This reminds me of every TV show and movie I've seen where consoles begin exploding on a space ship during a battle. All of this time, I thought that was entirely a Hollywood fabrication! -- Mark J. Blair, NF6X http://www.nf6x.net/
RE: New Listings for Sellam's Collection Sales
Some of the Q-BUS stuff is very cheap. Pity I am in the UK. I thought the Atari Mega ST4 was a little expensive given its untested. I know it needs a special video lead to test but mine popped a video driver. Also technically it doesn't usually boot from disk. The OS is in ROM but it will read a settings file from floppy. On Atari Mega 2s, the two I have come across has bad internal floppy drives. And they're really cool looking, so no desire to replace with a generic PC one (that will work, but not fit the plastic.) So I opted on mine to add an ultrasatan board mounted to the RF shield internally, with the SD card exposed on the back where the epansion board cover is. I used an external floppy to copy software to the SD card on the ultrasatan. My friend landed a Mega 2 as well, and his drive was bad as well. I haven't attempted to repair yet but it might be worthwhile to figure out what the failure is on these rarities. - Ethan -- : Ethan O'Toole
Re: CDC 6600 display character generation
> On Jun 7, 2018, at 3:21 AM, Lars Brinkhoff via cctalk > wrote: > > Paul Koning wrote: >> I have converted the "chassis tabs 12" wire lists to a VHDL model, >> which you can find on my Subversion server. Run on GHDL, it >> demonstrates the behavior of the circuit and reproduces the documented >> waveforms. >> >> I have also attempted to create a SPICE model of the DD60 deflection >> signal path. > > I wish more terminal emulators had this attention to detail! Thanks! The SPICE model isn't in the display emulator. I was thinking that if I could make it look correct, I'd measure the impulse response and use that for an FIR filter that would go in the emulator, replacing the current hand-hacked IIR filters. The emulator does have some attention to detail. It uses the controller's stroke shapes, adjusted by those IIR filters. Then I apply a Gaussian distribution to mimic the CRT spot (width controlled by the focus control). The resulting shapes are saved. Then to plot a character, I add that into the pixel map, with saturation and decay. The idea of simulating the decay was lifted from Phil Budne's work in SIMH. Yes, that pretty nicely simulates the actual display, about as accurately as you might hope to do in software. It could be done better in an FPGA, that would be an interesting project for LCM (6000 channel in, HDMI out). paul
RE: New Listings for Sellam's Collection Sales
Some of the Q-BUS stuff is very cheap. Pity I am in the UK. I thought the Atari Mega ST4 was a little expensive given its untested. I know it needs a special video lead to test but mine popped a video driver. Also technically it doesn't usually boot from disk. The OS is in ROM but it will read a settings file from floppy. Dave > -Original Message- > From: cctalk On Behalf Of systems_glitch > via cctalk > Sent: 07 June 2018 14:40 > To: Sellam Ismail ; General Discussion: On-Topic > and Off-Topic Posts > Subject: Re: New Listings for Sellam's Collection Sales > > Prices have seemed fair to me, I've bought a bit of stuff off Sellam over the > last few months and he's been prompt in shipping, as well as willing to > combine shipping costs. Nothing wrong in not giving your hardware away. > > Thanks, > Jonathan > > On Thu, Jun 7, 2018 at 12:59 AM, Sellam Ismail via cctalk < > cctalk@classiccmp.org> wrote: > > > Hi Randy. > > > > I have stuff that you can't find on eBay. And I am not offering the > > eBay experience. This is me, Sellam, you are dealing with. > > > > When I can find actual closing sales online (I need some place to > > start), I generally go on the lower end of the mean of the data I > > find. It's a collectors market, sometimes I'm high, sometimes I'm low, but > I'm trying. > > Do you know how to assess the value of items as diverse as what I'm > > listing? I do, it's a lot of work. Come help out if you have the > > time, I'll trade you for stuff. > > > > The listed prices are what I'm asking, as stated. I'm always open to > > offers, as stated. I price fairly, to move it, and if something sits > > for a while, you have a good chance of negotiating a price more to > > your liking, if you ask, but know that I am willing to sit on some > > things. I invested a lot of time, effort, blood, sweat, tears and > > money into my collection over many years. I'd like to recoup some of it. > > > > All you have done is propounded a broad-based whine. if there's > > something that interests you but the price is not right, let me know. > > I'm making many sales and many deals, stuff is moving. Ask and ye may > well receive. > > Just be reasonable. > > > > Sellam > > > > On Wed, Jun 6, 2018 at 7:57 PM, Randy Dawson > > > wrote: > > > > > Inspired by ebay for all the items there that never sell for the > > > asking price. > > > > > > > > > C'mon Sellam, you want to get out, how about lowering the prices a > > > bit to move things along? > > > > > > > > > -- > > > *From:* cctalk on behalf of Ed > > > Sharpe > > via > > > cctalk > > > *Sent:* Wednesday, June 6, 2018 7:50 PM > > > *To:* sellam.ism...@gmail.com; cctalk@classiccmp.org; > > > cctalk@classiccmp.org > > > *Subject:* Re: New Listings for Sellam's Collection Sales > > > > > > do the prices keep increasing? > > > > > > In a message dated 6/4/2018 10:02:53 PM US Mountain Standard Time, > > > cctalk@classiccmp.org writes: > > > > > > > > > Hi Folks. > > > > > > I've reorganized my sales listings into a Google Sheets set. The > > > introductory page is here: > > > > > > https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_ > > > HJ5oMKuab4zrApI_hiX0pNmy48/edit#gid=0 > > > > > > Use the tabs on the bottom of the sheet to navigate to the various > > "rooms". > > > > > > New items have been added and are listed here: > > > > > > https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_ > > > HJ5oMKuab4zrApI_hiX0pNmy48/edit#gid=949372371 > > > > > > New items are always added to the New Arrivals Niche, so that's the > > > first place you should check when you visit my virtual online > > > warehouse. I will post a message to this list and the VCFed forums > > > whenever new items are listed, which will occur more regularly. > > > > > > As always, please inquire directly to me via e-mail for the fastest > > > response. > > > > > > Thanks! > > > > > > Sellam > > > > >
Re: New Listings for Sellam's Collection Sales
I can offer a free participation to my website http://downthebunker.chickenkiller.com/ 2018-06-07 15:40 GMT+02:00 systems_glitch via cctalk : > Prices have seemed fair to me, I've bought a bit of stuff off Sellam over > the last few months and he's been prompt in shipping, as well as willing to > combine shipping costs. Nothing wrong in not giving your hardware away. > > Thanks, > Jonathan > > On Thu, Jun 7, 2018 at 12:59 AM, Sellam Ismail via cctalk < > cctalk@classiccmp.org> wrote: > >> Hi Randy. >> >> I have stuff that you can't find on eBay. And I am not offering the eBay >> experience. This is me, Sellam, you are dealing with. >> >> When I can find actual closing sales online (I need some place to start), I >> generally go on the lower end of the mean of the data I find. It's a >> collectors market, sometimes I'm high, sometimes I'm low, but I'm trying. >> Do you know how to assess the value of items as diverse as what I'm >> listing? I do, it's a lot of work. Come help out if you have the time, >> I'll trade you for stuff. >> >> The listed prices are what I'm asking, as stated. I'm always open to >> offers, as stated. I price fairly, to move it, and if something sits for a >> while, you have a good chance of negotiating a price more to your liking, >> if you ask, but know that I am willing to sit on some things. I invested a >> lot of time, effort, blood, sweat, tears and money into my collection over >> many years. I'd like to recoup some of it. >> >> All you have done is propounded a broad-based whine. if there's something >> that interests you but the price is not right, let me know. I'm making >> many sales and many deals, stuff is moving. Ask and ye may well receive. >> Just be reasonable. >> >> Sellam >> >> On Wed, Jun 6, 2018 at 7:57 PM, Randy Dawson >> wrote: >> >> > Inspired by ebay for all the items there that never sell for the asking >> > price. >> > >> > >> > C'mon Sellam, you want to get out, how about lowering the prices a bit to >> > move things along? >> > >> > >> > -- >> > *From:* cctalk on behalf of Ed Sharpe >> via >> > cctalk >> > *Sent:* Wednesday, June 6, 2018 7:50 PM >> > *To:* sellam.ism...@gmail.com; cctalk@classiccmp.org; >> > cctalk@classiccmp.org >> > *Subject:* Re: New Listings for Sellam's Collection Sales >> > >> > do the prices keep increasing? >> > >> > In a message dated 6/4/2018 10:02:53 PM US Mountain Standard Time, >> > cctalk@classiccmp.org writes: >> > >> > >> > Hi Folks. >> > >> > I've reorganized my sales listings into a Google Sheets set. The >> > introductory page is here: >> > >> > https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_ >> > HJ5oMKuab4zrApI_hiX0pNmy48/edit#gid=0 >> > >> > Use the tabs on the bottom of the sheet to navigate to the various >> "rooms". >> > >> > New items have been added and are listed here: >> > >> > https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_ >> > HJ5oMKuab4zrApI_hiX0pNmy48/edit#gid=949372371 >> > >> > New items are always added to the New Arrivals Niche, so that's the first >> > place you should check when you visit my virtual online warehouse. I will >> > post a message to this list and the VCFed forums whenever new items are >> > listed, which will occur more regularly. >> > >> > As always, please inquire directly to me via e-mail for the fastest >> > response. >> > >> > Thanks! >> > >> > Sellam >> > >>
Re: New Listings for Sellam's Collection Sales
Prices have seemed fair to me, I've bought a bit of stuff off Sellam over the last few months and he's been prompt in shipping, as well as willing to combine shipping costs. Nothing wrong in not giving your hardware away. Thanks, Jonathan On Thu, Jun 7, 2018 at 12:59 AM, Sellam Ismail via cctalk < cctalk@classiccmp.org> wrote: > Hi Randy. > > I have stuff that you can't find on eBay. And I am not offering the eBay > experience. This is me, Sellam, you are dealing with. > > When I can find actual closing sales online (I need some place to start), I > generally go on the lower end of the mean of the data I find. It's a > collectors market, sometimes I'm high, sometimes I'm low, but I'm trying. > Do you know how to assess the value of items as diverse as what I'm > listing? I do, it's a lot of work. Come help out if you have the time, > I'll trade you for stuff. > > The listed prices are what I'm asking, as stated. I'm always open to > offers, as stated. I price fairly, to move it, and if something sits for a > while, you have a good chance of negotiating a price more to your liking, > if you ask, but know that I am willing to sit on some things. I invested a > lot of time, effort, blood, sweat, tears and money into my collection over > many years. I'd like to recoup some of it. > > All you have done is propounded a broad-based whine. if there's something > that interests you but the price is not right, let me know. I'm making > many sales and many deals, stuff is moving. Ask and ye may well receive. > Just be reasonable. > > Sellam > > On Wed, Jun 6, 2018 at 7:57 PM, Randy Dawson > wrote: > > > Inspired by ebay for all the items there that never sell for the asking > > price. > > > > > > C'mon Sellam, you want to get out, how about lowering the prices a bit to > > move things along? > > > > > > -- > > *From:* cctalk on behalf of Ed Sharpe > via > > cctalk > > *Sent:* Wednesday, June 6, 2018 7:50 PM > > *To:* sellam.ism...@gmail.com; cctalk@classiccmp.org; > > cctalk@classiccmp.org > > *Subject:* Re: New Listings for Sellam's Collection Sales > > > > do the prices keep increasing? > > > > In a message dated 6/4/2018 10:02:53 PM US Mountain Standard Time, > > cctalk@classiccmp.org writes: > > > > > > Hi Folks. > > > > I've reorganized my sales listings into a Google Sheets set. The > > introductory page is here: > > > > https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_ > > HJ5oMKuab4zrApI_hiX0pNmy48/edit#gid=0 > > > > Use the tabs on the bottom of the sheet to navigate to the various > "rooms". > > > > New items have been added and are listed here: > > > > https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_ > > HJ5oMKuab4zrApI_hiX0pNmy48/edit#gid=949372371 > > > > New items are always added to the New Arrivals Niche, so that's the first > > place you should check when you visit my virtual online warehouse. I will > > post a message to this list and the VCFed forums whenever new items are > > listed, which will occur more regularly. > > > > As always, please inquire directly to me via e-mail for the fastest > > response. > > > > Thanks! > > > > Sellam > > >
Re: CDC 6600 display character generation
> On Jun 7, 2018, at 2:50 AM, Rick Bensene via cctalk > wrote: > > ... > > Believe me, the console did spit out a lot of sparks and little blobs of > molten metal, along with quite a bit of smoke. I still have a small > scar on my left leg where one of the little blobs of metal burned me > after burning through the material of my slacks. I definitely believe that. There's quite a lot of stored energy in that device: 2 kV power supplies with a pair of 4 uF filter capacitors, if things short out you will definitely get some excitement. > I remember keenly one of the CDC field guys saying that one of the big > driver tubes had shorted. There were quite a slew of other parts > (including some smaller vacuum tubes) that ended up being replaced, as > well as the left CRT tube which had a phosphor burn right in the center. > ... > > Whatever the cause of the failure, it was something that surprised the > CDC guys. Maybe the shorted tube was an artifact of the failure, and > not the cause...hard to remember exactly. But, I do know that two of > those big ceramic and metal tubes were replaced, as well as the left > CRT, and a whole slew of other parts. And I do clearly remember them > saying that the driver tubes had to be replaced in pairs. If the final drive tube shorts plate to grid, you'd get 2 kV working its way back into the previous stage. Those tubes are only rated for a few hundred volts on the plate. Not to mention that 2 kV feeding back into the previous stage power supply would be a problem also. As for replacing in pairs, it's a differential signal path and it would not be surprising if they required matched pairs. paul
Re: VCF East Photo Thread
On Thu, 7 Jun 2018 at 04:14, Tony Aiuto via cctalk wrote: > > Mine here. It includes some bits from my other museums at the facility > > https://photos.google.com/share/AF1QipO6j53IKGboKAmsUmAdDoj4ugeEGd1igUOgfRMtBpIqaibPJX2USBG0crSDeICWsQ?key=aFpMdFNxYlBUZTBjTldJajN6RDlHVmJtblRhUTBn Thanks for that! I couldn't read some of the informational cards because they are short moving GIFs, rather than static images, but still interesting. It's weird to see stuff I would consider commonplace -- such as an Acorn A3020 -- or that I remember working with early in my career -- such as an Amstrad PPC -- in a museum display. Inter-continental variation, plus I'm old, although I don't feel it. -- Liam Proven - Profile: https://about.me/liamproven Email: lpro...@cix.co.uk - Google Mail/Hangouts/Plus: lpro...@gmail.com Twitter/Facebook/Flickr: lproven - Skype/LinkedIn: liamproven UK: +44 7939-087884 - ČR (+ WhatsApp/Telegram/Signal): +420 702 829 053
Re: CDC 6600 display character generation
Paul Koning wrote: > I have converted the "chassis tabs 12" wire lists to a VHDL model, > which you can find on my Subversion server. Run on GHDL, it > demonstrates the behavior of the circuit and reproduces the documented > waveforms. > > I have also attempted to create a SPICE model of the DD60 deflection > signal path. I wish more terminal emulators had this attention to detail! There's one called cool-retro-term which looks nice, but it's only mimicing superficial appearance.
Re: New Listings for Sellam's Collection Sales
Hi Randy. I have stuff that you can't find on eBay. And I am not offering the eBay experience. This is me, Sellam, you are dealing with. When I can find actual closing sales online (I need some place to start), I generally go on the lower end of the mean of the data I find. It's a collectors market, sometimes I'm high, sometimes I'm low, but I'm trying. Do you know how to assess the value of items as diverse as what I'm listing? I do, it's a lot of work. Come help out if you have the time, I'll trade you for stuff. The listed prices are what I'm asking, as stated. I'm always open to offers, as stated. I price fairly, to move it, and if something sits for a while, you have a good chance of negotiating a price more to your liking, if you ask, but know that I am willing to sit on some things. I invested a lot of time, effort, blood, sweat, tears and money into my collection over many years. I'd like to recoup some of it. All you have done is propounded a broad-based whine. if there's something that interests you but the price is not right, let me know. I'm making many sales and many deals, stuff is moving. Ask and ye may well receive. Just be reasonable. Sellam On Wed, Jun 6, 2018 at 7:57 PM, Randy Dawson wrote: > Inspired by ebay for all the items there that never sell for the asking > price. > > > C'mon Sellam, you want to get out, how about lowering the prices a bit to > move things along? > > > -- > *From:* cctalk on behalf of Ed Sharpe via > cctalk > *Sent:* Wednesday, June 6, 2018 7:50 PM > *To:* sellam.ism...@gmail.com; cctalk@classiccmp.org; > cctalk@classiccmp.org > *Subject:* Re: New Listings for Sellam's Collection Sales > > do the prices keep increasing? > > In a message dated 6/4/2018 10:02:53 PM US Mountain Standard Time, > cctalk@classiccmp.org writes: > > > Hi Folks. > > I've reorganized my sales listings into a Google Sheets set. The > introductory page is here: > > https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_ > HJ5oMKuab4zrApI_hiX0pNmy48/edit#gid=0 > > Use the tabs on the bottom of the sheet to navigate to the various "rooms". > > New items have been added and are listed here: > > https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_ > HJ5oMKuab4zrApI_hiX0pNmy48/edit#gid=949372371 > > New items are always added to the New Arrivals Niche, so that's the first > place you should check when you visit my virtual online warehouse. I will > post a message to this list and the VCFed forums whenever new items are > listed, which will occur more regularly. > > As always, please inquire directly to me via e-mail for the fastest > response. > > Thanks! > > Sellam >
