Re: It has been quiet.

On 09/05/2016 04:59, Adrian Stoness wrote: all your msgs are going into my spam box ust noticed this On Thu, Apr 28, 2016 at 1:04 AM, wrote: nope it is working In a message dated 4/27/2016 10:48:48 P.M. Mountain Standard Time, dkel...@hotmail.com writes: Has the

RE: Is there an authoritative copy of the PDP 11 Field Guide?

I would be happy to host this, but I don't want to irk the content owner (Megan)... who I have heard is very much still around J

Re: Beam-penetration color CRT, Tektronix DAS 912x (was Re: Nice LAB11 brochure.)

On Sun, May 8, 2016 at 9:57 AM, Pete Lancashire wrote: > I thought the Tektronix DAS used a custom tri-color crt, where the > blue phosphor was replaced with yellow. It is custom, and it is tri-color (red, green, yellow), but it's a beam penetration CRT that is not a

Re: It has been quiet.

all your msgs are going into my spam box ust noticed this On Thu, Apr 28, 2016 at 1:04 AM, wrote: > nope it is working > > > > In a message dated 4/27/2016 10:48:48 P.M. Mountain Standard Time, > dkel...@hotmail.com writes: > > Has the list gone down or just dropped me

Re: VT101 screen adjustment

On 05/08/2016 04:20 PM, Adrian Graham wrote: Anyhoo, the VT101's screen is showing the stretch-at-top-compress-at-bottom issue, is that adjustable using the troubleshooting guide in the technical reference or am I looking at replacing some caps? I'm guessing this is due to a failing non-polar

Re: Calling for [Point 4] IRIS programmers

Thanks for sharing that, Ian! Your story is exactly what I was hoping to gather here. Does our dissection of the LU0 make any sense to you? On Sun, May 8, 2016 at 3:54 PM, Ian S. King wrote: > On Sun, May 8, 2016 at 1:31 AM, Microtech Dart > wrote: > >

Re: CDC 9429 Floppy maintenance manual

On 05/08/2016 02:33 PM, Philip Pemberton wrote: > My awards list more or less goes as follows: > > Hardest to align: Nintendo Famicom Disk System. For bonus points, > when you replace the drive belt, you have to realign the drive hub, > which sets the "start of track" position. There must be a

Re: CDC 9429 Floppy maintenance manual

On 08/05/16 21:49, Chuck Guzis wrote: > On 05/08/2016 01:30 PM, tony duell wrote: > >> They are considerably better than the Shugart drives with the plastic >> disk with a spiral groove for the head positioner > > Ah yes, the SA-400. When I was evaluating one, I wondered if Shugart > was

Re: CDC 9429 Floppy maintenance manual

It would have at least had to be the SA400-L, since the SA400 was 35 track, and PC-DOS, from the get-go, used 40 tracks. Or [trivially] patched. Either done right, or kludged by putting a non-existent file in the directory occupying tracks 35-39. There were some strange patches in the

Re: CDC 9429 Floppy maintenance manual

On 05/08/2016 02:02 PM, Paul Berger wrote: > Are you sure about the SA-400 being used in 5150s? All the ones I > ever saw where Tandon TM-100s which look very much like them and I > saw lots as a support person in an IBM lab in the early 80s. They > have the same sort of motor setup to turn the

Re: CDC 9429 Floppy maintenance manual

Oddly, my own troubles with the SA-400 (believe it or not, this was used as the original IBM offering for the 5150 drive) were with the tach circuit. Mine blew a small inductor. On Sun, 8 May 2016, Paul Berger wrote: Are you sure about the SA-400 being used in 5150s? All the ones I ever saw

Re: CDC 9429 Floppy maintenance manual

On 2016-05-08 5:49 PM, Chuck Guzis wrote: On 05/08/2016 01:30 PM, tony duell wrote: They are considerably better than the Shugart drives with the plastic disk with a spiral groove for the head positioner Ah yes, the SA-400. When I was evaluating one, I wondered if Shugart was really

Re: CDC 9429 Floppy maintenance manual

> > Ahhh... of course, I should have thought of that. > > I am even more cautious about using the 9428 manual for 9429 > > service, then. Actually, many lines of drives, such as the Tandon TM100 have the same circuitry for both the 48tpi and 96tpi variants. (and the TM100-4M at 100tpi) On Sun,

Re: Calling for [Point 4] IRIS programmers

On Sun, May 8, 2016 at 1:31 AM, Microtech Dart wrote: > Hi, all. It's been a while since I've discussed anything here. We've made > a lot of progress re-constructing a couple of Point 4 machines (as much as > one can without the actual hardware), yet still need some

Re: CDC 9429 Floppy maintenance manual

On 05/08/2016 01:30 PM, tony duell wrote: > They are considerably better than the Shugart drives with the plastic > disk with a spiral groove for the head positioner Ah yes, the SA-400. When I was evaluating one, I wondered if Shugart was really serious about the things. Doubtless some

Re: Beam-penetration color CRT, Tektronix DAS 912x (was Re: Nice LAB11 brochure.)

I thought the Tektronix DAS used a custom tri-color crt, where the blue phosphor was replaced with yellow. On Sat, May 7, 2016 at 10:24 PM, Eric Smith wrote: > I got out my Tektronix DAS 9129 logic analyzer mainframe, which uses a > red/green/yellow beam penetration CRT.

RE: CDC 9429 Floppy maintenance manual

> > Actually, many lines of drives, such as the Tandon TM100 have the > > same circuitry for both the 48tpi and 96tpi variants. (and the > > TM100-4M at 100tpi) > > One of the things that endears to me those pieces of garbage is that They are considerably better than the Shugart drives with the

Re: CDC 9429 Floppy maintenance manual

On 05/08/2016 01:09 PM, Fred Cisin wrote: > Actually, many lines of drives, such as the Tandon TM100 have the > same circuitry for both the 48tpi and 96tpi variants. (and the > TM100-4M at 100tpi) One of the things that endears to me those pieces of garbage is that they apparently changed PCB

Re: CDC 9429 Floppy maintenance manual

I have reason to believe that the CDC 9428 and 9429 are identical except that the 9429 is jumpered for 80 tracks and the 9428 is jumpered for 40 tracks... but I'm not 100% sure. * On Sat, May 07, 2016 at 11:17:50PM -0600, Eric Smith wrote: They would have to have different

Re: CDC 9429 Floppy maintenance manual

* On Sat, May 07, 2016 at 11:17:50PM -0600, Eric Smith wrote: > On Sat, May 7, 2016 at 1:19 PM, Seth Morabito wrote: > > I have reason to believe that the CDC 9428 and 9429 are identical > > except that the 9429 is jumpered for 80 tracks and the 9428 is >

Re: Beam-penetration color CRT, Tektronix DAS 912x (was Re: Nice LAB11 brochure.)

> > > > I'm pleased to find that the 9129 passes self-test and the display > works. Unfortunately I do not have any logic analyzer acquisition or > pattern generator modules for it, so other than admiring the pretty > display, it's only useful as a boat anchor. > Surplus Gizmos in Hillsboro

Re: Beam-penetration color CRT, Tektronix DAS 912x (was Re: Nice LAB11 brochure.)

On May 8, 2016 10:45 AM, "Jon Elson" wrote: > There is a LOT of Tek logic analyzer gear on eBay. Some of it goes fairly cheap, the older it is the cheaper. > You can likely find the right acq modules within a month. The 91xx is REALLY old, too, so should cost more to

Decmate 2 error codes

Just picked up a Decmate 2 and have managed to get a monitor, keyboard and boot disk (I think) setup for it, but when I attempt to boot it, I'm getting alternating error codes 17 and 19(on different boot attempts). I've searched and found some of the startup error codes but not these particular

Re: Facit 4070 to PC interface

Thanks for the link! I didn't know about it. Looks like a pretty straightforward trick, very helpful. Marc > On May 4, 2016, at 8:32 PM, Bob Rosenbloom wrote: > >> On 5/4/2016 5:52 PM, Charles Dickman wrote: >> Has anyone ever worked up a PC parallel port to Facit 4070

Re: Beam-penetration color CRT, Tektronix DAS 912x (was Re: Nice LAB11 brochure.)

On 05/08/2016 12:24 AM, Eric Smith wrote: I got out my Tektronix DAS 9129 logic analyzer mainframe, which uses a red/green/yellow beam penetration CRT. It uses raster scan, whereas my other device with a beam penetration CRT, the HP 1338A (also red/green/yellow) is a vector (X-Y) display. I'm

CMU-CS-78-104

Came across this in some stuff I got last week and thought it was pretty interesting http://bitsavers.org/pdf/cmu/cs-tr/CMU-CS-78-104_Impact_of_Implementation_Design_Tradeoffs_on_Performance_PDP-11_Feb78.pdf

Re: HP breakup... Website & ftp being trashed ... save what you can

On 05/07/2016 02:14 PM, Al Kossow wrote: On 5/7/16 8:24 AM, Jules Richardson wrote: shunted things across to an old 486 machine and wrote images there. I had thought about a mass conversion for all the versions of the diagnostics and configuration programs, but then went back to all of the

Re: PDP-11/05 microcode dump?

> From: Mattis Lind > I'll check all PROM chips on both board sets tomorrow. Check out the Computer History wiki Web page first; I looked at a couple of boards, and added all the chip types I could find. DEC used a vast variety, it seems! Noel

Calling for [Point 4] IRIS programmers

Hi, all. It's been a while since I've discussed anything here. We've made a lot of progress re-constructing a couple of Point 4 machines (as much as one can without the actual hardware), yet still need some help from a few knowledgeable folks in this 35+ year old OS. It was built on the DG Nova

Re: Is there an authoritative copy of the PDP 11 Field Guide?

On Sat, May 7, 2016 at 2:04 PM, paul popelka wrote: > blockquote, div.yahoo_quoted { margin-left: 0 !important; border-left:1px > #715FFA solid !important; padding-left:1ex !important; > background-color:white !important; } I've been using Megan Gentry's copy > at

Re: Is there an authoritative copy of the PDP 11 Field Guide?

On 5/7/2016 11:04 AM, paul popelka wrote: I've been using Megan Gentry's copy at http://world.std.com/~mbg/ but that seems to have disappeared recently.There seem to be several other copies available with different update dates. Which copy of this do other people use?Thanks,Paul I have