Re: Voltage regulator with alternate voltage source...

2016-04-10 Thread drlegendre .
Eric, No, not a series diode (in series with the In or Out), but a diode connected from Out to In, with the band on the In terminal. It provides a moderately high current path in the event that the voltage on the Out exceeds that on the In. This might occur if the input voltage suddenly drops (sh

Re: Voltage regulator with alternate voltage source...

2016-04-10 Thread Eric Smith
On Sun, Apr 10, 2016 at 8:54 PM, drlegendre . wrote: > I've often wondered why the back-current diode isn't incorporated into the > die of all common linear regs. Is it that costly, or simply impractical due > to die space or other considerations? Because it would introduce additional voltage dro

Re: Voltage regulator with alternate voltage source...

2016-04-10 Thread drlegendre .
I've often wondered why the back-current diode isn't incorporated into the die of all common linear regs. Is it that costly, or simply impractical due to die space or other considerations? In fact, I believe that some of the more modern regs do employ it.. just not the old-standby like LM317, 7805

Stuff for sale in Seattle

2016-04-10 Thread Josh Dersch
Hi all -- Spring is nearly here and it's time to clear out some space. The following stuff must go, drop me a line if you're interested. Local pick-up in Seattle, WA. Free: - 2x TI 1500S UNIX workstations. One's an S1505 with a 68030, one's an S1507 with a 68040. Both power up and pass

Re: In search of VAX 8550 or similar...

2016-04-10 Thread Paul Anderson
If you need parts for any of them, let me know... On Sun, Apr 10, 2016 at 3:51 PM, Mike Ross wrote: > I'm in NZ and I'm down for at least a couple of the large systems - 750 & > 785. Possibly 8600 730 & a pedestal machine. Traveling just now, can I get > back to you in a week or so? > On Apr 10,

Still looking for: Nova 800/1200 power supplies

2016-04-10 Thread Josh Dersch
Hi all -- Nearly two years back I picked up some Nova 800/1200 gear, mostly in pieces. I've been trying to track down power supplies for these for awhile, thought I'd try asking here again and see if I have any better luck this time :). Both chassis are the "Jumbo" variety, and take two pow

Re: IBM/PC XT and AT boot disks needed

2016-04-10 Thread Paul Anderson
I have several AT or XT motherboards that are possibly new, but probably refurbished. If any needs any, feel free to contact me off list. Paul On Sun, Apr 10, 2016 at 10:37 AM, Richard Cini wrote: > Looks like an info-packed site. Thanks for the link. > > Sent from my iPhone > > > On Apr 10, 20

Re: Voltage regulator with alternate voltage source...

2016-04-10 Thread dwight
To protect a regulator against a back volt, you can put a diode, in reversed polarity. How many pixels will the camera have? Dwight

RE: In search of VAX 8550 or similar...

2016-04-10 Thread Mike Ross
I'm in NZ and I'm down for at least a couple of the large systems - 750 & 785. Possibly 8600 730 & a pedestal machine. Traveling just now, can I get back to you in a week or so? On Apr 10, 2016 2:49 PM, wrote: > Hi Ian, > > I have a fairly large collection of large VAX machines that are available

Re: In search of VAX 8550 or similar...

2016-04-10 Thread Mark J. Blair
> On Apr 10, 2016, at 11:49, malc...@avitech.com.au wrote: > > I have a fairly large collection of large VAX machines that are available > for sale. Here is a rough list: > > Large Vax Machines > 1. VAX 11/785 I'd like to go on record stating that I'm jealous of your 11/785! B

RE: In search of VAX 8550 or similar...

2016-04-10 Thread malcolm
Hi Ian, I have a fairly large collection of large VAX machines that are available for sale. Here is a rough list: Large Vax Machines 1. VAX 11/785 2. VAX 8550 3. VAX 6000-430 4. VAX Vector 6000-520 5. VAX 6000-630 6

Re: IBM/PC XT and AT boot disks needed

2016-04-10 Thread Richard Cini
Looks like an info-packed site. Thanks for the link. Sent from my iPhone > On Apr 10, 2016, at 11:20 AM, Ali wrote: > > Rich, > > Checkout http://www.minuszerodegrees.net/index.htm. > > -Ali > >> -Original Message- >> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of

RE: IBM/PC XT and AT boot disks needed

2016-04-10 Thread Ali
Rich, Checkout http://www.minuszerodegrees.net/index.htm. -Ali > -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of > Richard Cini > Sent: Sunday, April 10, 2016 7:54 AM > To: CCTalk > Subject: IBM/PC XT and AT boot disks needed > > All - > > I'm help

IBM/PC XT and AT boot disks needed

2016-04-10 Thread Richard Cini
All — I’m helping a buddy of mine restore an original XT and original AT and I’m looking for original boot disks for them. I have the AT Diagnostics disk but the other disks I have seem to be bad. Does anyone have images that they could send me or point me to an archive of original disks? Thank

RE: websites on the classiccmp server

2016-04-10 Thread Ali
Jay, I was wondering if it would be possible to rename my web site on the classiccmp server from megacube.classiccmp.org to ibm51xx.classiccmp.org? If it is too much trouble don't worry about it. Otherwise I'd appreciate it very much. Thank you. Ali