Re: Mounting HP7970e 9-Trk 1/2" Tape Drive

At 11:39 AM 2/7/2019, Chuck Guzis via cctalk wrote: On 2/7/19 9:16 AM, Jack Harper via cctalk wrote: > I mounted the two HP7970 Drives in a non-HP rack - just a standard > six-foot 19" rack that I found a few years ago. > > I installed two heavy aluminum rails (1/8" thick and perhaps 2" on the

Re: sun 88780 on ebay

On Mon, Jan 28, 2019 at 6:03 PM Al Kossow via cctalk wrote: > https://www.ebay.com/itm/132933407806 > It was packaged improperly by the seller and destroyed in transit.

Re: PDP-11/45 RSTS/E boot problem

On Mon, Feb 11, 2019 at 4:13 PM Jon Elson via cctalk wrote: > > On 02/11/2019 07:04 AM, Noel Chiappa via cctalk wrote: > > A look at the RK11 registers after the swap-out showed an anomaly; something > > about the extended memory address bits? (Maybe a multi-block transfer than > > crosses a 64KB

Re: Mounting HP7970e 9-Trk 1/2" Tape Drive

On 2/11/19 9:16 AM, Fred Cisin via cctalk wrote: > A few hundred pounds slid all the way out will topple it. > If the center of gravity is NOT within the perimeter of the base, . . . > Need to bolt the rear to the floor, or something SOLID, and extend the > "footprint" of the front to include

Re: PDP-11/45 RSTS/E boot problem

Yup; specifically, the symptoms are consistent with 'D15 RKBA=ALL 1 L' being incorrectly generated at BA 16, causing an increment to EX.MEM, causing a skip in the DMA. So it looks like problem with bit 12 in that carry logic; I'll check E28 and E34 when I get back to it tonight, but I have

Re: PDP-11/45 RSTS/E boot problem

On Mon, Feb 11, 2019 at 6:03 PM Noel Chiappa via cctalk wrote: > > > From: Jon Elson > > > Likely some disk controllers did NOT SUPPORT crossing 64K boundaries! > > No; the RK11 spec says "[the two extended memory bits] make up a two-bit > counter that increments each time the RKBA

Re: Mounting HP7970e 9-Trk 1/2" Tape Drive

> On Feb 11, 2019, at 12:24 PM, Jack Harper via cctalk > wrote: > > At 10:16 AM 2/11/2019, Fred Cisin via cctalk wrote: >> ...Need to bolt the rear to the floor, or something SOLID, and extend the >> "footprint" of the front to include where the center of gravity is when >> fully extended.

Re: PDP-11/45 RSTS/E boot problem

> From: Jon Elson > Likely some disk controllers did NOT SUPPORT crossing 64K boundaries! No; the RK11 spec says "[the two extended memory bits] make up a two-bit counter that increments each time the RKBA overflows". The actual error turns out to be slightly different to my guess;

Re: sun 88780 on ebay

On 2/11/19 10:01 AM, Eric Smith via cctalk wrote: > On Mon, Jan 28, 2019 at 6:03 PM Al Kossow via cctalk > wrote: > >> https://www.ebay.com/itm/132933407806 >> > > It was packaged improperly by the seller and destroyed in transit. Happens all too often. Palletizing is probably the safest, but

Re: sun 88780 on ebay

Does it have the 800 bpi option board? On 2/11/19 10:01 AM, Eric Smith wrote: > On Mon, Jan 28, 2019 at 6:03 PM Al Kossow via cctalk > wrote: > > https://www.ebay.com/itm/132933407806 > > > It was packaged improperly by the seller and destroyed in transit. >

Re: PDP-11/45 RSTS/E boot problem

> From: Jerry Weiss > Though not a disk controller, the DEC DR11-B/DA11-B would not cross 64K > boundaries. Interesting! What's odd is that the DR11-B uses the Bus Interface card (M7219) from the RC11 controller, and that _can_ cross moby boundaries, so clearly it has the right

Re: Mounting HP7970e 9-Trk 1/2" Tape Drive

On 2/11/19 10:48 AM, Tapley, Mark via cctalk wrote: > Jack, this looks like a pretty good idea in the short term. But, every piece > of concrete I have ever been associated with has been off-gassing water at a > slow rate. I have stored wood face-down on concrete enough times that I > should

Re: PDP-11/45 RSTS/E boot problem

> On Feb 11, 2019, at 11:12 AM, Jon Elson via cctalk > wrote: > > On 02/11/2019 07:04 AM, Noel Chiappa via cctalk wrote: >> A look at the RK11 registers after the swap-out showed an anomaly; something >> about the extended memory address bits? (Maybe a multi-block transfer than >> crosses a

Re: Mounting HP7970e 9-Trk 1/2" Tape Drive

At 10:16 AM 2/11/2019, Fred Cisin via cctalk wrote: On Mon, 11 Feb 2019, Jack Harper via cctalk wrote: Hello Chuck - I like the idea of those sliding rails - and they appear by the link to be good to 200-pounds. However, with the HP7970 Drives, I would worry about the moment pressure exerted

Re: Mounting HP7970e 9-Trk 1/2" Tape Drive

On Mon, 11 Feb 2019, Jack Harper via cctalk wrote: Hello Chuck - I like the idea of those sliding rails - and they appear by the link to be good to 200-pounds. However, with the HP7970 Drives, I would worry about the moment pressure exerted on the rack with the unit slid all the way out. . . .

Re: PDP-11/45 RSTS/E boot problem

On 2/11/19 11:50 AM, Paul Koning via cctalk wrote: On Feb 11, 2019, at 11:12 AM, Jon Elson via cctalk wrote: On 02/11/2019 07:04 AM, Noel Chiappa via cctalk wrote: A look at the RK11 registers after the swap-out showed an anomaly; something about the extended memory address bits? (Maybe a

Re: Mounting HP7970e 9-Trk 1/2" Tape Drive

> From: Alan Frisbie > Harbor Freight sells a nice hydraulic lift table for under $200 that I > have found very useful for that sort of thing. It doesn't go up very high > (like for the top of a rack), but I used it with some wood blocks Thanks for the tip! I got one on sale for

Re: PDP-11/45 RSTS/E boot problem

> On Feb 11, 2019, at 1:13 PM, Jerry Weiss wrote: > > On 2/11/19 11:50 AM, Paul Koning via cctalk wrote: >>> ... >> You may be thinking about PC controllers like the floppy controller. I >> can't remember ANY DEC DMA device controller that had boundary crossing >> limits of any kind. It

Re: Mounting HP7970e 9-Trk 1/2" Tape Drive

At 11:48 AM 2/11/2019, Tapley, Mark wrote: > On Feb 11, 2019, at 12:24 PM, Jack Harper via cctalk wrote: > > At 10:16 AM 2/11/2019, Fred Cisin via cctalk wrote: >> ...Need to bolt the rear to the floor, or something SOLID, and extend the "footprint" of the front to include where the center

Re: Mounting HP7970e 9-Trk 1/2" Tape Drive

> On Feb 11, 2019, at 2:14 PM, Jack Harper via cctalk > wrote: > > At 11:48 AM 2/11/2019, Tapley, Mark wrote: >> ... >> Jack, this looks like a pretty good idea in the short term. But, every piece >> of concrete I have ever been associated with has been off-gassing water at a >> slow rate.

RE: Wirewrap DIP sockets - any interest?

Will I would be interested in some. Mike Zahorik (414) 254-6768 -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of William Donzelli via cctalk Sent: Monday, February 11, 2019 02:37 PM To: Bill Gunshannon; General Discussion: On-Topic and Off-Topic Posts

Re: sun 88780 on ebay

On Mon, Feb 11, 2019 at 11:18 AM Al Kossow wrote: > Does it have the 800 bpi option board? > I haven't yet unboxed it. I took photos of the outside of the destroyed box to send to the shipper. The front bottom left corner of the 88780 is visible through a hole in the box, and is visibly

Re: PDP-11/45 RSTS/E boot problem

> From: Jerry Weiss > it is impressive that UNIX booted successfully without tripping over a > boundary. Well, V6 is (or can be configured to be) extraordinarily small, so I'm not surprised it booted OK without going over the 017 mark. I have this persistent memory that the

Re: Wirewrap DIP sockets - any interest?

On 2/11/19 3:25 PM, William Donzelli via cctalk wrote: > Does anyone here still actively wire wrap circuits? I am thinking > about dumping my inventory of nice machine pin wirewrap sockets. > Lately they have been selling like lead balloons. > > Contact me off list. > > -- > Will, in the Hudson

Re: PDP-11/45 RSTS/E boot problem

On 2/11/19 12:31 PM, Noel Chiappa via cctalk wrote: > From: Jerry Weiss > Though not a disk controller, the DEC DR11-B/DA11-B would not cross 64K > boundaries. Interesting! What's odd is that the DR11-B uses the Bus Interface card (M7219) from the RC11 controller, and that _can_

Re: Wirewrap DIP sockets - any interest?

On 2/11/19 3:29 PM, Bill Gunshannon via cctalk wrote: > On 2/11/19 3:25 PM, William Donzelli via cctalk wrote: >> Does anyone here still actively wire wrap circuits? I am thinking >> about dumping my inventory of nice machine pin wirewrap sockets. >> Lately they have been selling like lead

Re: Wirewrap DIP sockets - any interest?

I will start to gather them up. Basically, 25 cents for little guys (14s, 16s, etc), 50 cents for big guys (24s, 28s, 40s), and a buck for 28s and 40s with full gold plate. Obviously all DIPs. -- Will On Mon, Feb 11, 2019 at 3:29 PM Bill Gunshannon via cctalk wrote: > > On 2/11/19 3:25 PM,

Re: Bellmac 8 Tutor on ebay

although   I  think   most  production    for  switch gear   was   done   with the later   32  bit   unit Ed# In a message dated 2/10/2019 12:49:36 PM US Mountain Standard Time, cctalk@classiccmp.org writes: telephone  gear? ed# In a message dated 2/10/2019 12:26:20 PM US Mountain Standard

RE: SGI Personal Iris 4D/35

Hey Kyle. You can narrow things down a bit by removing the optional Z-buffer and additional bitplane memory (ZB3 and BP4). While that removes those two masses of memory out of the equation that still leaves the still massive amount of ZIPP base video memory. for the later Onyx systems I've only

Re: sun 88780 on ebay

I am in the market for this option as well, after Al is taken care of if he needs it. On Mon, Feb 11, 2019 at 1:27 PM Eric Smith via cctalk wrote: > On Mon, Feb 11, 2019 at 11:18 AM Al Kossow wrote: > > > Does it have the 800 bpi option board? > > > > I haven't yet unboxed it. I took photos of

Re: SGI Personal Iris 4D/35

On Mon, Feb 11, 2019, 19:02 John Ball via cctalk Hey Kyle. > You can narrow things down a bit by removing the optional Z-buffer and > additional bitplane memory (ZB3 and BP4). While that removes those two > masses of memory out of the equation that still leaves the still massive > amount of ZIPP

Re: Wirewrap DIP sockets - any interest?

I might think that the 40s with full plate on the pins might be a buck or so each. -- Will On Mon, Feb 11, 2019 at 7:25 PM Bill Degnan via cctech wrote: > > What is the gold value? > > On Mon, Feb 11, 2019, 6:11 PM mike via cctech wrote: > > > Will I would be interested in some. > > > > Mike

Re: Wirewrap DIP sockets - any interest?

What is the gold value? On Mon, Feb 11, 2019, 6:11 PM mike via cctech wrote: > Will I would be interested in some. > > Mike Zahorik > (414) 254-6768 > -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of William > Donzelli via cctalk > Sent: Monday,

HP1000 L series, FULL LIST ( UPDATED )

All boards are corroded. May be some can be saved ? I am offering : 12002 B XL Ctrl 512 Kb 51x0-013 x = ?Pictures available 12001 C CPU 12001-80001 Has the 1AB5-6001 "HP SoS processor" with Two EPROM ( 12001-80006 and 80007 ) Any interest in imaging these ?

Re: PDP-11/45 RSTS/E boot problem

> From: Fritz Mueller > If, as you are suspecting, we find damning evidence pointing > specifically to the RK11 I got an update from Fritz. As you all will recall, the problem seemed to be a corrupted 'pure text'. So the question was 'when was it damaged, and how'. After some

Re: PDP-11/45 RSTS/E boot problem

On 02/11/2019 07:04 AM, Noel Chiappa via cctalk wrote: A look at the RK11 registers after the swap-out showed an anomaly; something about the extended memory address bits? (Maybe a multi-block transfer than crosses a 64KB boundary? That would explain the address sensitivity we were seeing.)