Odd Connections to Rectifier?

2017-12-18 Thread Rob Jarratt via cctalk
I am reverse engineering the schematic for the input stage of my H7862 PSU. I have come across a KBU6J bridge rectifier which seems to be connected only to the two middle pins, which are the AC inputs. I can't see any other connections. Before I desolder it to verify there are no connections I can'

Re: Odd Connections to Rectifier?

2017-12-18 Thread Brent Hilpert via cctalk
On 2017-Dec-18, at 12:06 AM, Rob Jarratt via cctalk wrote: > I am reverse engineering the schematic for the input stage of my H7862 PSU. > I have come across a KBU6J bridge rectifier which seems to be connected only > to the two middle pins, which are the AC inputs. I can't see any other > connecti

Re: Odd Connections to Rectifier?

2017-12-18 Thread Peter Coghlan via cctalk
> > I am reverse engineering the schematic for the input stage of my H7862 PSU. > I have come across a KBU6J bridge rectifier which seems to be connected only > to the two middle pins, which are the AC inputs. I can't see any other > connections. Before I desolder it to verify there are no connecti

Re: Odd Connections to Rectifier?

2017-12-18 Thread Tony Duell via cctalk
On Mon, Dec 18, 2017 at 8:06 AM, Rob Jarratt via cctalk wrote: > I am reverse engineering the schematic for the input stage of my H7862 PSU. > I have come across a KBU6J bridge rectifier which seems to be connected only > to the two middle pins, which are the AC inputs. I can't see any other > con

Re: IBM MT/ST recovery; was: IBM 3480 DEC TKZ60 inquiry

2017-12-18 Thread Chuck Guzis via cctalk
On 12/17/2017 09:52 PM, Jon Elson wrote: > There were several DIFFERENT formats used with these standard tape > cartridges.  I have some old CDC Patriot tape drives that did a > serpentine single track at a time format on a 3480-compatible tape. I > don't think any DEC drive supported the 18-track

XKCD on what we're doing

2017-12-18 Thread Paul Koning via cctalk
https://xkcd.com/1909/ Our community isn't just about that, but it's part of what makes us tick. paul

Re: IBM MT/ST recovery; was: IBM 3480 DEC TKZ60 inquiry

2017-12-18 Thread Chuck Guzis via cctalk
Forgive the top-posting on my own post, but I think it's appropriate: Evidently, the client used an MT/ST to emulate a 2741 and the organization had a S/360 with a 2495 Magnetc Cartridge Reader: http://ed-thelen.org/comp-hist/IBM-ProdAnn/2495-5.pdf I have to confess that I've never seen one of t

Re: eBay: MEMOREX 3693-2 & 3690-2 Disc Drive Mainframe IBM 3370-2 VINTAGE

2017-12-18 Thread Curious Marc via cctalk
Excellent! Congrats Guy. Looks like modempot really needs to move out of his building in a hurry. I think between me, you, Carl, Bob, the museum and a few ebay buyers we got all of the big stuff saved. Marc On Dec 17, 2017, at 4:44 PM, Guy Sotomayor Jr via cctalk wrote: To let folks now, I’v

Re: IBM MT/ST recovery; was: IBM 3480 DEC TKZ60 inquiry

2017-12-18 Thread Al Kossow via cctalk
http://www.computerhistory.org/collections/catalog/102662523 Digi-Data made a widget to read the tapes as well. On 12/18/17 12:57 PM, Chuck Guzis via cctalk wrote: > Forgive the top-posting on my own post, but I think it's appropriate: > > Evidently, the client used an MT/ST to emulate a 2741 a

Re: XKCD on what we're doing

2017-12-18 Thread Tony Aiuto via cctalk
On Mon, Dec 18, 2017 at 1:25 PM, Paul Koning via cctalk < cctalk@classiccmp.org> wrote: > https://xkcd.com/1909/ > > Our community isn't just about that, but it's part of what makes us tick. > Preserving knowledge is an ongoing problem and getting harder to solve. Vint Cerf talks about it a lot.