Re: DEC H7140 (11/44) power supply revisions and general advice?

2015-10-11 5:44 GMT+02:00 Josh Dersch : > On Sat, Oct 10, 2015 at 2:38 PM, tony duell > wrote: > > > > > > > From a quick glance at the schematic I think that this part is related > to > > > the fan driving circuitry. The diodes look like some kind

WTB: Compaq Portable 386

If anyone has one they want to offload I'd be keen to hear about it please. thanks.

RE: DEC H7140 (11/44) power supply revisions and general advice?

> > The bias voltage is generated by the chopper on page three in conjunction > with T1 and some rectifying diodes on the motherboard. Then it is feed back > to the bias board on J2:2 to produce the 5V. (page 2) Yes... It's not totally obvious at first glance, but this is yet another SMPSU with

RE: DEC H7140 (11/44) power supply revisions and general advice?

> > I'm slowly coming to terms with the schematic but I'm not quite clear where > these two voltages are being generated. I note from the block diagram that > the +15 and +12 are rectified on the motherboard (backplane) -- which > should make it GREAT fun to probe. So it looks like some careful

Re: HP & 800BPI / was Re: Tape cleaner on eBay

On 2015-Oct-10, at 9:59 PM, Marc Verdiell wrote: > Brent Hilpert wore: >> I had that problem with the stuck reel hubs. Failed to take my own > advice-to-self to leave the reels unmounted and they stuck again, >> although easier to get off this time as it hadn't been many years

Re: PDP-12 Restoration at the RICM

We swapped the TU56 and TU55 drives between the PDP-12 and the PDP-8/I. We found that the TU56 uses a double-sided paddle card for the control signals and the TU55 uses a single-sided paddle-card. The TC12 tape controller in the PDP-12 will work with either tape drive if you have the right cable.

Re: DEC H7140 (11/44) power supply revisions and general advice?

On 2015-Oct-10, at 8:44 PM, Josh Dersch wrote: . . . > Thanks for the explanation. I tacked on some wires to the bias board (to > bring them out for safe probing); the wires are connected to the 5V logic > supply and the +12V bias supply and I get nothing at all out of them when > the H7140 is

RE: DEC H7140 (11/44) power supply revisions and general advice?

> > Am I missing something? - is there anywhere in that doc that explicitly > declares the > association between the 2-dozen connectors, for example, that Line Supply P1 > & P2 > connect to Motherboard J5 & J4, and that Bias and Interface Board J1 & J2 > connect > to Motherboard J7 & J6? Not

Re: FS: Cray J932SE system

That is quite an impressive pile of sgi. Do you have any of the big sgi gear around still? The last of my big SGI was a full rack SGI Origin 2000 (one of my favorites!) I posted it for free or something on NekoChan and a local person (I was in Virginia Beach at the time) came and picked it

blog entry

Hello, 4 hours ago I posted an email concerning a huge amount of documentation that I have. I also included about 30 pictures. I can find no indication that this email was distributed. Is there a problem with this information? Was it received? Tony Pflum

Re: blog entry

dunno did not see it Tony - - maybe file to large? send to me direct to check out thanks ed Sharpe archivist for smecc In a message dated 10/11/2015 6:13:45 P.M. US Mountain Standard Time, tonyp...@gmail.com writes: Hello, 4 hours ago I posted an email concerning a huge amount

Re: DEC H7140 (11/44) power supply revisions and general advice?

On Sun, Oct 11, 2015 at 12:07 PM, Brent Hilpert wrote: > On 2015-Oct-10, at 8:44 PM, Josh Dersch wrote: > . . . > > Thanks for the explanation. I tacked on some wires to the bias board (to > > bring them out for safe probing); the wires are connected to the 5V logic > >

Re: blog entry

On 10/11/15 6:13 PM, Tony wrote: I also included about 30 pictures. Any message with attachments is bounced on this mailing list.

Re: WTB: Compaq Portable 386

Howdy Nigel, I believe that I do have one of these machines, and it's in good working order as of a couple months back. You're looking for a Portable /// correct? Are you in the USA? Best, Bill On Sun, Oct 11, 2015 at 2:48 AM, Nigel Williams < n...@retrocomputingtasmania.com> wrote: > If

Re: WTB: Compaq Portable 386

On Mon, Oct 12, 2015 at 12:49 PM, drlegendre . wrote: > I believe that I do have one of these machines, and it's in good working > order as of a couple months back. You're looking for a Portable /// > correct? > > Are you in the USA? > Hi Bill, thanks for the follow-up,

Re: WTB: Compaq Portable 386

Ahhh.. OK. I think you're right, I might only have the original 286 version.. in fact, I'm almost sure. Let me check on it, and if I have what you want, I'll get back to you. Best, Bill On Sun, Oct 11, 2015 at 9:53 PM, Nigel Williams < n...@retrocomputingtasmania.com> wrote: > On Mon, Oct 12,

Re: DEC H7140 (11/44) power supply revisions and general advice?

On 10/11/15 6:19 PM, Josh Dersch wrote: On Sun, Oct 11, 2015 at 12:07 PM, Brent Hilpert > wrote: On 2015-Oct-10, at 8:44 PM, Josh Dersch wrote: . . . Note that the "+13V" supply must also be present, and it's generated and

Re: PDP-12 Restoration at the RICM

On 11 October 2015 at 10:42, Michael Thompson wrote: > We are running out of things to try for debugging the TC12 controller in > the PDP-12. At this point we are really stumped as to why the TC12 doesn't > work correctly. We are going to try a few remaining ideas

Re: blog entry

On 10/11/15 6:13 PM, Tony wrote: I also included about 30 pictures. In my case, my email server tosses any email larger than about 10MB into the bit bucket. If you have a lot of stuff, it's probably better to upload it to someplace such as Box and post the link. Sending MIME-encoded files

Re: PDP-12 Restoration at the RICM

I have no constructive input to share - except the strong memory of the bloke who maintained my pdp-12s for 25 years before I collected them saying that the TC12 was an "absolute bugger" and the hardest part of the machine to troubleshoot! Good luck and don't feel bad about having a hard time with

Re: Xebec 1402A Seagate HDD controller

The 1402A was in error — it's a 1410A with version 1.0 firmware. David Sent from my iPhone > On Oct 11, 2015, at 21:18, Mark J. Blair wrote: > > >> On Oct 11, 2015, at 16:54, Devin Monnens wrote: >> >> Was curious if anyone here has - or knows someone who

Re: Xebec 1402A Seagate HDD controller

> On Oct 11, 2015, at 16:54, Devin Monnens wrote: > > Was curious if anyone here has - or knows someone who does - a Xebec 1402A > Seagate HDD controller. The drive is in an IBM 5150. Note that this MUST be > the 1402A, NOT the more common 1402. There is some important

Xebec 1402A Seagate HDD controller

Was curious if anyone here has - or knows someone who does - a Xebec 1402A Seagate HDD controller. The drive is in an IBM 5150. Note that this MUST be the 1402A, NOT the more common 1402. There is some important historical data we are trying to recover, but the controller is nonfunctioning. Thank