- test-drb@ccmp.vtda.org - classiccmp.org

by pete＠dunnington.u-net.com

On Dec 15, 22:42, Jerome H. Fine wrote: > >Pete Turnbull wrote: > > > Yes, because that's about the only useful distinction -- the speed > > increase brought by PMI memory is more than the clock difference > > between 15MHz and 18MHz -- and of course if placed after the CPU, even > > a PMI-capable memory board operates as normal Q-Bus memory. > > Approximate speed increase from M8190-AB (KDJ11-BB) > with normal DEC memory (obviously below the CPU) vs > M8190-AE (KDJ11-BF) with DEC PMI memory above > the CPU was about 33%. An assembly which took about > 4.5 minutes was reduced to about 3 minutes. I can't recall > the exact numbers or exactly what I tried, but the test with > the M8190-AB and the PMI memory above the CPU took > about 23% less time than 4.5 minutes. I then tried the > M8190-AE and normal DEC memory below the CPU > and that took about 10% less time than 4.5 minutes. When > the PMI memory was below the M8190-AE, that also > took about 10% less than the 4.5 minutes. So, taking the M8190-AB as baseline, and doing some arithmetic: M8190-AB M8190-AE 15MHz 18MHz non-PMI 1.0 1.1 PMI memory 1.3 1.5 18MHz is 1.2 times 15MHz, so it seems other operations on the bus are reducing the effect of the clock speed increase. Of course, that might also be due to using memory with a different cycle time. Still, it's clear that the PMI makes a bigger difference than the clock speed, going from 15MHz to 18MHz. -- Pete Peter Turnbull Network Manager University of York

22 years, 3 months

2
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WTB: IBM L40SX manual

by vcf＠siconic.com

I need the manual to the IBM L40SX laptop. Willing to pay in Dollars (US, Canadian, or Australia), Euros, Rupees, Pounds, Iraqi Dinars, or Shekels. Hopefully you prefer Dollars (US). -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

22 years, 3 months

2
2
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Macintosh security lock

by cb＠mythtech.net

>The Macintosh Portable also has this feature. Does anyone know of, or >have, an actual locking mechanism that was made for the Macintosh >Portable? Does the portable's lock slot differ from either the Mac desktop units (like the Plus) or the laptop units (which some had a small hole that a keylock would fit into). I do have the lock clamps for a Mac Plus, and I believe it was the same as for any other desktop mac. Its a little metal bar that slips into the lock slot and snaps behind the tabs built into the case so it can't be removed. Then a cable slides thru the hole in the bar and is wrapped around and locked to any secure object. I used it to secure one of my Mac Pluses when my wife (then GF) borrowed one while in college. IF this is the same as for the Portable, then I have at least one lock plate still (it should still be in the keyboard that was used with the plus), but I'm sure I no longer have any packaging or documentation for it, and I may or may not still have additional plates or the cable. -chris <http://www.mythtech.net>

22 years, 3 months

2
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USB 5.25 floppy

by cb＠mythtech.net

>The reason I'm stuck using it is my Star Commander workstation is a little >486 laptop with no (working) Ethernet card, so disk images have to get >sneaker-netted to and from the dual G4. Can it use a parallel to ethernet adaptor? I've got two from Xircom, and I bought them at a local computer flea market for $5.00 each (well, I bought one, my brother bought the other, and then gave it to me when he stopped using it). -chris <http://www.mythtech.net>

22 years, 3 months

10
12
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Macintosh security lock

by vcf＠siconic.com

If you hadn't noticed, most (all?) Macintosh models from the first through the Mac IIs had a slot on the back for inserting a security mechanism so that the computer could be chained to a desk. The Macintosh Portable also has this feature. Does anyone know of, or have, an actual locking mechanism that was made for the Macintosh Portable? Actual examples or documentation thereof will suffice if you've got them. Thanks! -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

22 years, 3 months

2
1
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Unusual DEC module: what is this thing?

by kahrs＠caip.rutgers.edu

Just a note to say that the 1103 is what put Intel on the map (IMHO). It's a 1Kx1 memory and was also used in the Alto. It features an external "precharge" pin that was eliminated in later versions of the chip. Count your blessings.

22 years, 3 months

2
1
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VT-132 PSU question

by quapla＠xs4all.nl

Hi all, I recently grabbed a VT-132 with a non working PSU unit. Is there someone on the list who has a schematic of the PSU or has a surplus one for sale/trade? I'm also looking for the manual but a good photocopy will do too. Thanks, Ed --

22 years, 3 months

2
1
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New Haul

by jrice54＠charter.net

My newest baby arrived today. I was recently contacted by a kind gentleman who was looking for a new home for some equipment. I was offered a NeXTstation, NeXT printer, N4000A monitor (clear and bright), SyQuest MO drive and a ton of software and documentation for free, just pay shipping. It just arrived, all in original NeXT boxes with the original invoice/packing slip from NeXT attached. The invoice is dated 1992 and shows a cost of $7995.00. It's now a second owner system. I can't wait to get it home and unpack it! James

22 years, 3 months

6
8
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FS/Free: Mac & IBM, old & new

by owad＠applefritter.com

Apple 14" RGB Monitors - $8 Power Mac 6100 w/RAM, HD - $10 Power Mac 7100 w/RAM, HD - $15 IBM System/23 - $25 (both a tower and a desktop model; boots up and can read directory from included 8" disk) 1950 Crosley TV & plate-shaped antenna - $65 (missing the 2 knobs, but otherwsie nice. untested) Like this one: <http://www.tvhistory.tv/1950-Crosley-Model-10-401-USA.JPG> Free: IBM PC Jr and monitor, in box, with some manuals and disks IBM Selectric II Royal typewriter 14" Mac monitor (the cheap Performa kind) 14" NEC PC Monitor Apple Imagewriter II printers Apple Imagewriter I printer(s?) Power Mac 6100's, no RAM, no HD Power Mac 7100's, no RAM no HD Pick-up in York, PA required for most everything. A few may ship. Pick- up in Easton, PA potentially workable. Wanted: PC of Pentium I/II/III capabilities macro lense for an old Nikon SLR Tom Applefritter www.applefritter.com

22 years, 3 months

1
0
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Looking for Local Apple club

by jrkeys＠concentric.net

Anyone on the list belong to the local Houston HAAUG club? Their website has gone offline since Friday (12/12). Wanting to know if this group is still active? Thanks

22 years, 3 months

4
4
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Olivetti Luggable Questions

by nbreeden2＠comcast.net

All, I was recently given an Olivetti luggable. http://personal.nbnet.nb.ca/gallante/olivetti.html links to a page on the same model machine. With a bit of work the system is running well, it has cleaned up really well and looks to have been lightly used at best. The insides were VERY clean considering its age and the conditions it had been stored in. There is no burn on the CRT and the display is clear and crisp. :) The motherboard is labeled 'Corona Data Systems' and is serial number 0160. Various dates indicate the system was built in 1983. I find several references to 'Corona Data System', it appears they were sued by IBM and lost over copyright infringement. I'd be curious to find out if this system is one of the ones that infringed on IBM's copyrights. At boot it POSTs the following: ROM Version 1.53 Testing Complete 512K Memory Installed 512K Memory available to DOS I've been able to boot several versions of DOS, and have formatted a set of working disks. :) I'm looking for more info on it, searching the web only provides the one link listed above. -Neil

22 years, 3 months

5
5
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Three Days of the Condor

by tomj＠wps.com

... opens with some very pretty PDP-8 stuff, a VT52?, a woman mounting dectapes.... The movie of course!

22 years, 3 months

7
9
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Building a PDP-11 for the first time

by pete＠dunnington.u-net.com

On Dec 14, 21:35, Jerome H. Fine wrote: > > Of course. The dialogue is in the ROMs, after all, and people did > > upgrade them (to get the ability to boot newer devices, for example). > > And DEC did as well, as far as I know since the upgrade > looks like an official DEC job. Very possibly, though it's often impossible to tell who actually fitted the replacement EPROMs -- DEC sold them to people on self-maintenance and to third-party maintenance companies like the one I worked for. > I failed to make my point so that it could be understood. > > I was trying to say that within each board specification > (i.e. all PDP-11/73 quad boards as one of the 3 groups), > there were still variations. There were probably many > variations for the PDP-11/73 or the M8190-AB board > over the years while the boards in the PDP-11/93 group > might have had just a few. But, just saying an M8190-AB > is not sufficient to be able to determine exactly what was > present. Ah yes, I see what you mean. > And that is quite a separate issue from whether or not > PMI memory was or was not used with the M8190-AB > or the M8190-AE boards. RT-11 would report both > of these boards as a PDP-11/73B Processor when the PMI > memory (or regular memory) was installed below the CPU. > If the PMI memory was installed above the CPU, RT-11 > reported both boards as a PDP-11/83 Processor. Yes, because that's about the only useful distinction -- the speed increase brought by PMI memory is more than the clock difference between 15MHz and 18MHz -- and of course if placed after the CPU, even a PMI-capable memory board operates as normal Q-Bus memory. > However, perhaps there is one area where we each > tend to have our preference. Since I am an RT-11 > software addict, I don't really care what hardware > is being used. In fact, the faster the better in most cases. > > Some people like to hear the original fans turning and > are not comfortable with a system that runs 100 times > as fast as the original hardware. Ah, I like to poke the switches, see the lights and hear the fans :-) -- Pete Peter Turnbull Network Manager University of York

22 years, 3 months

2
1
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Unusual DEC module: what is this thing?

by bshannon＠tiac.net

Does anyone recognise the following DEC module? HIGH SPEED MOS MEM MAT MS1440 G401C This is THE most unusual DEC board I've ever seen personally, and also the most beautiful. This board has an extreamly early example of an LED in the upper right hand corner where a machined metal stiffener is used in place of the usual cast part used on other Unibus boards. This stiffener appears to have been milled out of an extrusion, by hand. Nylon hardware is used along with the more conventional eye-ring rivits. The outside edge of this milled part is stamped 'G401'. This LED is made from a gold-clad machined metal case unlike anyI've ever seen (including those seen on the LED museum web site). I can't see the part number on the case, but I'd bet its a Hewlett Packard. This LED alone may well be worth more than the whole module! The IC's are an orderly mix of grey plastic, gold leaded Intel P1103-1's, and gold on white ceramic (with grey lead-frame traces) Intel 3207-1's. Arrays of individual resistors form high speed DC terminators for the arrays of 1103's and 3207's, and a small handful of TTL parts complete the list of chips. The TTL datecodes suggest its from 1970. The memory chips are not so easy to understand, the P1103-1's are marked: P1103-1 0531 And the 3207's are marked: 3207-1 S183 B0536 Both feature a large 'i" logo to the left of the markings. Clearly very early Intel parts. I suspect that this ~may~ have been a 'live spare' for a PDP 11T55 I once owned and ran many years ago. If anyone knows what this board is, I'd love to know. I can try to get a digital photo made, but that may take some time. If someone 'just has to' own this board, I'm willing to talk. The overall condition of the board is excellent and very few of the decoupling caps have scratches from installation and removal. The unusual edge-stiffener also shows unusually little ware.

22 years, 3 months

5
4
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Data sheet for MC6825

by dwight.elvey＠amd.com

>From: "Holger Veit" <holger.veit(a)ais.fhg.de> > >On Mon, Dec 15, 2003 at 11:21:10AM -0800, Vintage Computer Festival wrote: >> On Mon, 15 Dec 2003, Dwight K. Elvey wrote: >> >> > Does anyone have a data sheet for a Motorola MC6825? >> > I believe it is a USART but I can't find anything on >> > it. It is from the late 70's. >> >> I can only imagine at this point that it was a custom or internal part >> because I can't find any mention in any of my Motorola data books >> (several) nor the Master Selection Guide (1992). > >Do you mean by chance the MC68HC25? Hi No, this is a uP. this part is way to early to be a HC anything. Maybe I got the number wrong. I'll check it and be back tomorrow. It is from a Poly 8813 floppy controller board. This is a hard sectored interface so I suspect that it is some kind of USART. I was getting the number from my memory instead of writing it down. Dwight > >This is an I/O expander (port replacement) chip for various microcontrollers >such as the 146805E2, 6801, 6801U4, 6803, 6803U4 and 68HC11. >It comes in a 52 pin PLCC package. > >Its purpose is to provide the I/O ports of a microcontroller that get "lost" >if the system is expanded with external ROM/RAM (some ports of these uCs then >are used as the data bus and the multiplexed address bus). > >The data sheet I have is from 1990, not 1970's, though. > >Holger >

22 years, 3 months

2
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Data sheet for MC6825

by pete＠dunnington.u-net.com

On Dec 15, 13:05, Dwight K. Elvey wrote: > > >From: "Holger Veit" <holger.veit(a)ais.fhg.de> > >Do you mean by chance the MC68HC25? > > No, this is a uP. this part is way to early to be a HC anything. > Maybe I got the number wrong. I'll check it and be back tomorrow. > It is from a Poly 8813 floppy controller board. This is a hard > sectored interface so I suspect that it is some kind of USART. > I was getting the number from my memory instead of writing it > down. Maybe you meant 6852, which is a Synchronous Serial Data Adaptor. -- Pete Peter Turnbull Network Manager University of York

22 years, 3 months

1
0
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Ferrari 308 (was: building a PDP-11 etc.)

by jack.rubin＠ameritech.net

Cool - my chance to flame for the holidays! If you're on this list and thus interested in "classics", the 308 is way too nouveau - anything with less than 12 cylinders (street cars only - I would never discount the 4 and 6 cylinder comp cars or the 815) is only a cost-reduced shadow of a "real" Ferrari! Forza! (and of course, hohoho and Best Wishes to All) Jack

22 years, 3 months

1
0
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Data sheet for MC6825

by dwight.elvey＠amd.com

>From: "Al Kossow" <aek(a)spies.com> > > >You reversed the last two digits: > >MC6852, usrt, Synchronous Serial Data Adapter > > Hi Al Thanks. I expect that is what my dyslexic mind didi. I guess that is the one I need specs for. Dwight

22 years, 3 months

1
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Data sheet for MC6825

by aek＠spies.com

You reversed the last two digits: MC6852, usrt, Synchronous Serial Data Adapter

22 years, 3 months

1
0
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SGI IRIS 3010 for sale

by vcf＠siconic.com

I'm brokering the sale of the following system. If there's any interest, please send me your offer or questions via private mail. -- SGI IRIS 3010 3D graphics workstation (with the Control Data Corporation logo and Cyber 910 designation) that was used for two years as a demo model and has mainly been in storage since then. It comes fully configured and equipped as follows: 68020 microprocessor UNIX o/s C, Fortran, Basic Windowing and Basic Graphics Library Flight program (serves as diagnostic), demos, and games 128 Mb hard drive 19" monitor with 24 bit color, 8 overlay planes, 1048x780 RGB screen Keyboard, optical mouse and mouse pad Tape cartridge drive, serial ports, Ethernet port, extra mouse The following manuals come with the system: IRIS Series 3000 Owner's Guide Cyber 910 User's Guide (Vol. 1 - Programming Guide; Vol. 2 - Reference Guide) UNIX Programmer's Guide (Vols. 1-4) CYBER 910-300 Administrator's Manual (Graphics Library Manual/User Guide & C Language Reference Manual) IRIS Communications Guide Update Package Version 1.1 GL2-W3.6 Workstation Release Notes TCP/IP User's Guide Learning to Debug with Edge (C Edition & Fortran Edition) Its casings are of steel (with beige paint), and are clean and undented. Includes the original wooden shipping palette with retractable ramp. This unit was manufactured in December, 1987, and was used for two years as a demo model by Control Data Corporation, which owned a big chunk of SGI stock. It was recently powered up and its flight simulator program was run to check the performance. There were no problems encountered while doing so. -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

22 years, 3 months

2
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mail classiccmp@classiccmp.org

by aek＠spies.com

> One thing I don't understand is why there is a preference > to use a .TAP file when an emulator is being used. Media Interchange. You can use a SCSI 9-track drive to create a tape on a simulated system and carry it over to an 11 with a tape drive. If you don't have an MSCP SCSI drive on the 11, other mass storage devices don't have interfaces on the simulated system. If you DO have an MSCP controller, a ZIP drive is the easiest shuttle media. Stick one drive on the 11, one on your system with the simulator, and use John's DO driver to pull the bits over to the simulator's host OS. I with SIMH had the equivalent (esp in the VAX world)

22 years, 3 months

3
2
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Three Days of the Condor

by SPEDRAJA＠ono.com

Yes, one of my preferred movies about spies of the seventies. Some teletypes, terminals and even Dectapes, i think. Another interesting movie with some old computing items is "The Falcon and the Snowman" (music of Pat Metheny and David Bowie, with Sean Penn and Timothy Hutton). There are some scenes of Hutton in one room of the CIA using old teletypes ASR33. In Science Fiction field, I like two movies specially with some computing interaction: "Colossus", and "The Andromeda Strain". Cheers Sergio ----- Mensaje Original ----- Remitente: Tom Jennings <tomj(a)wps.com> Fecha: Lunes, Diciembre 15, 2003 8:48 am Asunto: Three Days of the Condor > ... opens with some very pretty PDP-8 stuff, a VT52?, a woman mounting > dectapes.... > > The movie of course! >

22 years, 3 months

3
3
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Data sheet for MC6825

by dwight.elvey＠amd.com

Hi Does anyone have a data sheet for a Motorola MC6825? I believe it is a USART but I can't find anything on it. It is from the late 70's. Dwight

22 years, 3 months

4
3
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PDP11/74

by pechter＠pechter.dyndns.org

> > >Message: 16 >Date: Sun, 14 Dec 2003 18:52:21 -0800 (PST) >From: "Eric Smith" <eric(a)brouhaha.com> >Subject: RE: Building a PDP-11 for the first time >To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk(a)classiccmp.org> >Message-ID: > <33073.64.169.63.74.1071456741.squirrel(a)ruckus.brouhaha.com> >Content-Type: text/plain;charset=iso-8859-1 > >Antonio wrote: > > >>> I don't know what the performance figures were for the >>> 11/74 either. However, the beast was deemed to be too >>> hard to maintain. Too many cables, too much downtime. >> >> > >That was one of the rumors, but I've never believed it. There's no fundamental reason why it should have been any harder to maintain than any other large computer. I think this was just a feeble attempt by DEC management to come up with an excuse to give customers, when they didn't want to admit the real reason the product was cancelled. > >Yes, it needed more memory cables than any other PDP-11, but it's >utterly ridiculous to think that would be a serious problem. We're only talking about 68 memory cables per CPU for a maximally configured PDP-11/74, compared to 16 for a maximally configured PDP-11/70. >When was the last time you had a PDP-11/70 memory cable go bad? > >The memory cabling was in fact comparable in magnitude to that of a large VAX 11/782 configuration. > > Gimme a break. The MK memory cables were often the cause of multiple problems and the multiport version set up on a bunch of conjoined 11/70-type boxes would've been a nightmare. XXDP+ would've had to be loaded into a shared memory partition and it would've been a large PITA for the systems manager to have to do that while it was running. They could've required a preloaded diag monitor that could've been switched to the down box, though to get around this. Anyway, the 11/782's were large pains only when the SBA interconnects went bad which was a fairly rare occurrance when the machine was fully installed. The SBI cables were about 4 inches long... the 12-18 inch ones were used between cabinets. How many feet of MK cable would that have been! The MK cables were often nicked, cut or just plain and could've been sliced by tiles in multcpu configs... etc. I used 1/4 of an 11/74 at DEC Princeton. A nice pretty front panel and I'd have loved to work on one full-up. But maintaining it would've been a PITA. BIll pechter(a)monmouth.com

22 years, 3 months

1
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up late and working (classiccmp related)

by jwest＠classiccmp.org

Since the wife is out of town, it's a good night to stay up late and work on things classic computer related. I reached a milestone, so thought I'd share :) I now have two HP 7906 drives working flawlessly. 5 more to go. But instead of working on the others, right now I'm going through and running diags on each board in the 13037 controller... meaning of all the 7 or 8 13037 boxes I have, testing each card one at a time in a known working 13037. What fun. Very time consuming, but, when I go to work on the next drive, I can at least know any problems I run into are the drive rather than the controller. I'm also testing all the cards in the drive one at a time with cards from the other drives. Life is much better when you have two of an item to use as a testbed. I do have a 7905 as well... that one will probably wind up on the trading block - after I check it out and make sure it works. Anyone want a 7912? Heavy beast, and HPIB only so I have no interest in it. I think I'm going to go back and change my HP2000 Access system rack configuration. Move the paper tape reader and paper tape punch to the other side of the dual bay rack, and mount a 7906 in the spot where they were. Masochistic I tell ya. Well, this is all a milestone for ME at least, because I've always been somewhat "afraid" of working on 14" hard drives. But I think I'm getting the hang of it :) Well, diags just finished on the ECC board, time for the next card. Cheers Jay

22 years, 3 months

11
35
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OT: Wanted: P-III Slot 1 133 MHz FSB motherboard...

by dwoyciesjes＠comcast.net

Apologies for the OT message. Reply off-list... Subject says it all. I've got a P-III 733 MHz CPU, but no motherboard to use it in. Anybody have one kicking around? -- --- Dave Woyciesjes --- ICQ# 905818

22 years, 3 months

1
0
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DG Aviion 88k software/dumping disks...

by drido＠optusnet.com.au

I've got a DG Aviion 4000 (Motorola 88k based) here. I've never had it up and running as it came here without RAM. I want to pull the hdd to use in another machine. Before I reformat this HDD is anyone interested in the software that may be on it? If you're local (Melbourne, Australia) the easiest way would be to take the HDD and give me another 1GB SCSI HDD to replace it. Otherwise what's the easiest way to dump this disk to an image file on a DOS/Windows PC? I don't have anything running linux at the moment, so to do it under linux I'd need to be able to do it without having to actually installing linux... boot from a CD, write the image out to an existing fat32 formatted HDD.

22 years, 3 months

2
1
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Three Days of the Condor

by SPEDRAJA＠ono.com

Yes ! I din't remember it. And I recorded this movie some months ago and note this detail when I was seeing the movie. Cheers Sergio ----- Mensaje Original ----- Remitente: Christian Corti <Christian.Corti(a)studserv.uni-stuttgart.de> Fecha: Lunes, Diciembre 15, 2003 1:01 pm Asunto: Re: Three Days of the Condor > On 14 Dec 2003, Tom Jennings wrote: > > ... opens with some very pretty PDP-8 stuff, a VT52?, a woman > mounting> dectapes.... > > The movie of course! > > What else ;-) I've recorded it on a SVHS tape for better quality. > You can > even see the woman verifying the start address of 7605 (or was it > 7600?)before pressing CONT. > > Another interesting movie is "The angry red planet", a SF movie > from the > late fifties. The main computer on board of the space craft is a huge > Borroughs tube computer, with operator console and reel tape > drives. It's > fun to see the tubes glowing, at least you get that impression and to > watch the tapes moving. > Does anybody know the model of the computer? > > Christian > > >

22 years, 3 months

1
0
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Sheet-feed scanners

by tomj＠wps.com

Though hardly less than 10 years old, it's on the topic of old machinery... A limiting factor for me (and I'm sure others) to put up 'obsolete' documentation is hand scanning. Does anyone know of an inexpensive sheet feed scanner that will accept 50+ sheets? These "all in one" type things, like HP Officejet, only accept 10 sheets at a time, and do a poor job. Inexpensive meaning here a few hundred $US. Every few months I look and never find anything between the officejet and $10K large-office machines. With a decent feeder I'd saw bindings off to sheet-feed manuals and books I have duplicates of.

22 years, 3 months

2
1
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Building a PDP-11 for the first time

by pete＠dunnington.u-net.com

On Dec 12, 15:43, John Allain wrote: > All the talk about Qbus PDP11's is getting me a little anxious. > I have a bunch of *almost11* parts, but no machine. > > Does anyone want to sell/trade either: > > 11/53 PROM images 261E5.hex and 262E5.hex Those ROM images have been sitting on my web site at http://www.dunnington.u-net.com/public/DECROMs/ for nearly three years, in response to a request from someone else on this list. I have a fairly large collection of DEC ROMs (and always willing to accept more). Not all are on the website, for copyright reasons, but if there's a good reason to make one available (eg to make a repair), and you can't get it from DEC... -- Pete Peter Turnbull Network Manager University of York

22 years, 3 months

8
8
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Tandy color computer stuff for free

by SUPRDAVE＠aol.com

Ive got two copies of Rainbow Feb 1985 edition Donald ducks playground on disk VIP writer tutorial. No disks and the slipcase is missing. Pay for USPS shipping and its yours.

22 years, 3 months

1
0
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Building a PDP-11 for the first time

by chrisc＠addpower.com

Finally! Instead of just working on one, I'm going to try to build one >from some components that I've collected. Trouble is, I'm not sure how to put it all together. I saw mention of a QBUS howto, but the link to that seems to be long gone. Would a kind soul care to assist on this? This is what I have: BA23 enclosure M8190-AB (11/84 cpu) M8067 (512k memory?) M7516 (DELQA) Dilog DQ686 (ESDI controller) Maxtor ESDI drive (don't remember how large offhand) I'm thinking that I have all that I need here, but I could be wrong. I want to be able to run 2.11BSD on the machine... Cheers, Chris Cureau

22 years, 3 months

13
25
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Building a PDP-11 for the first time

by pete＠dunnington.u-net.com

On Dec 14, 17:47, Jerome H. Fine wrote: > >Pete Turnbull wrote: > > > No, not true. There are both dual and quad 11/73 (the quad being an > > 11/73-plus). The 11/73 was 15MHz, the 11/83 was always sold as 18MHz. > > Jerome Fine replies: > > While I have heard of a PDP-11/23 PLUS, I don't think > that "PLUS" was ever applied to the PDP-11/73 boards. I doubt it was an official designation, it's just what we (CFM) called them if they were in BA11-N boxes. The microPDP-11/73 machines in BA23 boxes always used the quad board, or course, so we never needed to distinguish. > >From what I understand, for the PDP-11/23 boards, the > "PLUS" could mean either the ability to address all 4 MBytes > of memory with the dual M8186 boards (I understand that > the original M8186 boards were able to address only 256 > KBytes) or that the quad M8189 board was being used. "plus" specifically meant the quad board, with the on-board boot ROMs, LTC and SLUs. All but the very first of revision of the dual boards can also address 4MB. > As for the PDP-11/73 boards, I had heard that some > did have the 18 Mhz crystal, but that might also have > been done privately. Megan Gentry just mentioned > that she changed the crystal on her PDP-11/83 board > to 20 MHz and it ran correctly. As far as I know, all the ones sold as 11/83 were 18MHz, all the ones sold as 11/73 were 15MHz. > > So does the 11/73, though it's different. > > This answer was with respect to the boot ROMs. I have > both a KDJ11-BB (M8190-AB) and a KDJ11-BF > (M8190-AE). Aside from the 15 MHz vs the 18 MHz > crystal, the fact that the latter also had the FPU chip > was standard with the KDJ11-BF. But the rev number > of the J11 chip on the KDJ11-AB is 04 and the EPROMs > are version 395E5 / 396E5 which can also be the EPROMs > for the KDJ11-BF. However, I understand that the J11 > rev number when an 18 MHz crystal is being used must > be at least 08 and maybe 09. Then I'm sure that your ROMs must have been changed at some point in the past. The 11/73 never had the same boot ROMs as an 11/83 unless it was upgraded (which was quite common). > So the dialogue for the PDP-11/73 and the PDP-11/83 can > be identical - it just depends on which version of the > EPROMs is being used. Of course. The dialogue is in the ROMs, after all, and people did upgrade them (to get the ability to boot newer devices, for example). > All this discussion seems to point out that the PDP-11/73, > PDP-11/83 and PDP-11/93 boards were not identical I disagree -- I don't see anything to differentiate an 11/73 board from an 11/83 from an 11/84, except the clock and the boot ROMs. Sure, different revs of J11 were used. The original spec was for a 20MHz or 25MHz chip but it didn't meet the spec. Sure, there were FCOs and ECOs, but they applied to both 11/73 and 11/83 (and presumably 11/84). You've shown yourself exactly what I said, that if you use PMI memory, the system thinks it's an 11/83 and if you use non-PMI memory, it's an 11/73. > nor did they use the same J11 CPU chip all the time, although > the last 09 rev CPU chip that was used with the PDP-11/93 > would probably work with all of the others, just NOT the > other way around with the early 04 rev CPU chips. Agreed. -- Pete Peter Turnbull Network Manager University of York

22 years, 3 months

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Building a PDP-11 for the first time

by pete＠dunnington.u-net.com

On Dec 14, 14:01, Megan wrote: > In fact, I have taken a KDJ11-B board with an 18Mhz clock, > removed the clock chip and replaced it with a 20Mhz clock > and the system ran solidly (I still have it). It also > correctly identifies, in the boot rom, that the machine has > a 20Mhz clock... I've done that too. I also have a dual-height running at 18MHz, but I know that one gets flaky at anything higher. > I don't have specific information about an FP bug... I remember > that some boards couldn't have the FPA installed due to some > bug but don't have the specifics. Somewhere in my piles of ol DEC stuff I have a note about which ones can/can't/already do -- but I'm not sure exactly where it is, nor whether that's an official original DEC document or a maintenance company one. As far as I remember, it was described as a bug in one of the ASICs. -- Pete Peter Turnbull Network Manager University of York

22 years, 3 months

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Building a PDP-11 for the first time

by pete＠dunnington.u-net.com

On Dec 14, 13:43, Megan wrote: > > >Why do you think you want a PDP-11/74? That's one of the "never-11s", > >a machine designed but never sold. It's the biggest -11 ever made. > > Designed and *BUILT*... it is, however, essentially unobtanium... That's why I said "never sold" -- I've seen photos but as far as I know they're of a prototype. > I have a line on one, but only if/when the person currently in > possession of it ever tires of it. That *would* be nice to have :-) -- Pete Peter Turnbull Network Manager University of York

22 years, 3 months

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Building a PDP-11 for the first time

by pete＠dunnington.u-net.com

On Dec 12, 10:32, emanuel stiebler wrote: > Patrick Finnegan wrote: > > From what I understand, the 11/73 and 11/83 are both J-11 cpus, the only > > difference being that the /73 runs at 15MHz and the /83 runs at 18MHz. > > the 11/73 is a double, the 11/83 is a quad size board, 11/83 has also > PMI, and was at the beginning a 15 MHz. No, not true. There are both dual and quad 11/73 (the quad being an 11/73-plus). The 11/73 was 15MHz, the 11/83 was always sold as 18MHz. > OH, and the 11/83 has a very nice verbose Boot-PROM ;-) So does the 11/73, though it's different. Source: personal experience of field servicing all of the above types, plus the Micro-PDP-11 Maintenance manual. -- Pete Peter Turnbull Network Manager University of York

22 years, 3 months

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Older IDE drives

by teoz＠neo.rr.com

Whats a good place to buy a few 500mb and 2gb IDE drives for projects? I have a 386 limited to 512mb and have a 486 that tops out at 2gb for dos and wanted to test a few older OS on them but ran out of drives. I need maybe 2 of each size dont care about brand as long as they are 3.5" hh drives (I have removable IDE cariers for them). Looks like 6-8gb is the low end size liquidaters on the net are selling.

22 years, 3 months

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Need info on UNISYS boxes

by jrkeys＠concentric.net

Today I picked up 3 UNISYS towers models UN6520-Z (2) and UN6065-Z50 (1). Can't find anything using google anyone have some information on these units? Thanks

22 years, 3 months

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Tax Free Musuem?

by jrice54＠charter.net

I seem to remember someone was attempting to gain a non-profit museum status from the IRS for their collection. Were they successful and what was the total out come? Was it worth the effort? Would they recomend the process for others? Was it worth the hassles of filing paperwork regularly? I know it's a lot of questions. My collection is out growing my available space (don't we all have this problem?), so I was wondering about options. James -- http://webpages.charter.net/jrice54/classiccomp2.html

22 years, 3 months

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MicroVAX II question

by jwillis＠coherent-logic.com

Rackmount MicroVAX II given to me by a local PCB manufacturer. When I went to pick this machine up, it worked at their location. Booted into VMS and everything. Took it out of rack to transport home (they would not give up the original DEC rack). I marked all cables before disassembling, and put it back together in the same configuration. Got it home and the system would not get past the "3" stage of its self test. Any ideas?

22 years, 4 months

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Building a PDP-11 for the first time

by pete＠dunnington.u-net.com

On Dec 13, 20:48, J.C. Wren wrote: > Supposing you're one of those people that have always wanted a PDP-11/74, but > know next to nothing about them. Is there a good guide anywhere for "here's > the cards, here's the combinations they'll work in, and here's why mixing > this card with that card will work, but isn't a good idea." > > I'd like to wind up with an 11/74 Why do you think you want a PDP-11/74? That's one of the "never-11s", a machine designed but never sold. It's the biggest -11 ever made. Do you want a Q-Bus machine (typically fairly small in size) or a Unibus machine (typically quite large)? Perhaps you're thinking of an 11/73? -- Pete Peter Turnbull Network Manager University of York

22 years, 4 months

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Disk hardware emulation, was Re: Grandfather system RTE6/VM?

by pete＠dunnington.u-net.com

On Dec 14, 0:02, Tony Duell wrote: > > I have the manual for the ACB4000 series, if you want to borrow it. > > How much useful information does it contain? Anything not obvious about > the board (i.e. anything I'd not fiogure out in 10 minutes given the > board and normal teat gear?) Other than the programming information for the various SCSI commands, no. -- Pete Peter Turnbull Network Manager University of York

22 years, 4 months

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Disk hardware emulation, was Re: Grandfather system RTE6/VM?

by pete＠dunnington.u-net.com

On Dec 11, 12:05, Jules Richardson wrote: > On Wed, 2003-12-10 at 23:50, Tony Duell wrote: > > Some controller have links to enable/disable precompensation. The Adaptec > > ACB4000 (I mention that one, since I have an ACW on the bench at the > > moment, so the details are stuck in my brain) > > Oh, that reminds me - I came across another ACW owner last night. > Waiting to hear what (if any) docs / software he has for it. I have the manual for the ACB4000 series, if you want to borrow it. -- Pete Peter Turnbull Network Manager University of York

22 years, 4 months

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Reel-to-Reel care?

by MGemeny＠pgcps.org

Whereas, Al Kossow wrote: >The long term prospects of tape transports with any rubber parts is not good, either. >Almost all of the 1/4" cartridge tape drives I own are inoperable because the drive >pinch rollers have turned to goo. Now therefore: I?m left to wonder of these rubber parts could be recast. I have had success casting rubber using Devcon flexane. It?s a 2 part mix with extremely low shrinkage. The medium ?80? liquid has a companion softener flex-add which allow one to adjust the hardness of the resulting rubber. I have used Freeman machinable wax to make molds with good results. I would think that with reasonable machining practice a run-out of a thousandth or so could be had re-rubberizing a roller spindle. (A human hair being about 3 thousandths of an inch) If greater precision were required a machining allowance could be added to the rubber and it could be frozen and ground after casting. (Not that I would look forward to liquid nitrogen all over my south bend lathe, and it?s not like we?re making disk heads here) The bottom line is that if it was made, it can be made. After all, some telescope hobbyists make their own mirrors! Your thoughts? Mike.

22 years, 4 months

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Building a PDP-11 for the first time

by pete＠dunnington.u-net.com

On Dec 12, 11:27, John Allain wrote: > >> Jerome Fine replies: > >> > >> First, the M8190-AB is a PDP-11/73 CPU board and > >> usually runs in an ALL Qbus system. Don't forget that > > > Patrick Finnegan answers: > > So can someone fix this in the "FIELD GUIDE TO Q-BUS > > AND UNIBUS MODULES" > > doc? It's got an M8190 listed as an 11/84 CPU. > > In another source > KDJ11-A_UsersManual.pdf. page.73/2-18, > the M8192 is the J11, which is the 11/73 CPU. Not necessariliy, or to put it another way, both are correct. The J11 is a chip , used in several PDP-11 variants. The M8190 is a processor board used in 11/73, 11/83, and 11/84. The difference is (1) the 11/73 originally had a 15MHz clock, and the 11/83 and 11/84 had an 18MHz clock, (2) the 11/73 and 11/8x had different ROMs, and (3) in an 11/73 system the memory is arranged after the CPU in conventional fashion, whereas in an 11/83 the memory is PMI memory and is placed before the CPU. There are several revisions of the ROMs for the 11/8x, and the second letter of the suffix (the first is always 'B') tells you what the original ROM version was. This is a quad-height board with two bootstrap ROMs (actually EPROMs), line time clock, and two SLUs. All M8190s are the same (modulo engineering change orders etc) apart from crystal and ROMs. The M8192 is always an 11/73; it's a dual-height board with no SLus or ROMs, etc. It was usually sold as an OEM item or as an upgrade for 11/23 systems. There ar a few variants of this too, becasue there as a bug in early versions of an ASIC which meant that some early ones would not work with an FPU upgrade. All these boards are Q-Bus boards. There is no Unibus version. The 11/84 used an M8190 in a backplane with a Unibus converter (the CPU and memory were Q-Bus, the rest of the machine was Unibus). The 11/94 worked in a similar way. However, Eric may be right about the 11/84 bus being slightly different from normal Q-Bus, so that the official 11/84 memory may be different. -- Pete Peter Turnbull Network Manager University of York

22 years, 4 months

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Building a PDP-11 for the first time

by pete＠dunnington.u-net.com

On Dec 12, 12:57, emanuel stiebler wrote: > John Allain wrote: > > > Wasn't there an 11/93~4 too... > > Was this a J11 with more clock speed again? > > Nope. But all memory (fast !) was on board already, and 8 serial lines. Er, yes it was a J11, but different board. -- Pete Peter Turnbull Network Manager University of York

22 years, 4 months

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Building a PDP-11 for the first time

by pete＠dunnington.u-net.com

On Dec 12, 20:08, Jochen Kunz wrote: > AFAIK that M8192 dual /73 CPU board was never used in DEC machines. It > was targeted to the OEM market or to replace the dual /23 board used in > embedded systems. It was also sold in the 11/73S systems (look like an 11/23 but have a KDJ11 processor). -- Pete Peter Turnbull Network Manager University of York

22 years, 4 months

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WTD: LC1552B, ITT 492-5 and NatSemi NSA298 data

by philpem＠dsl.pipex.com

Hi, Someone's just given me a Commodore Minuteman 3MW (model MM3MW) calculator. The device itself is working fine, but I still need to replace the battery pack and charge connector (the batteries were rechargeable nicad, N size). Anyway, just to satisfy my curiosity, I'd like to get some data on the ICs used inside it - these are: LC1552B / 7438 - looks like the main controller. Has some strange logo I've never seen before - kind of a _/- (a squared off S?) with a circle printed over the top. ITT / 492-5 / 7445 - these appear to be LED drivers. I've never seen a part number like this. BTW, the "7445" is printed vertically, the rest of the p/n is printed horizontally (as normal). NSA298 / NS 436 - the "NS" looks a LOT like one of National Semiconductor's old logos. Did NatSemi ever make LED display panels? Now, to finish satisfying my curiosity, does anyone know anything about the Commodore MM3MW? A schematic diagram or service manual would be nice :) Thanks. -- Phil. | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB, philpem(a)dsl.pipex.com | ViewFinder, 10BaseT Ethernet, 2-slice, http://www.philpem.dsl.pipex.com/ | 48xCD, ARCINv6c IDE, SCSI

22 years, 4 months

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HP and Cabletron Hubs available

by jwillis＠coherent-logic.com

6x HP EtherTwist 10bt hubs available. Each has: 1x AUI port (10base5) 1x Thinwire port (10base2) 12x UTP port (10baseT) Serial management port 1x Cabletron HubSTACK SEHI-22 10bt hub 12x UTP port (10baseT) EPIM slot (populated with extra UTP port) COM port for management Best offer + shipping. Contact me off list if interested.

22 years, 4 months

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Hard drives available

by jwillis＠coherent-logic.com

The following old hard drives are available. Will ship. Maxtor 71336A Maxtor 71626AP Maxtor 7541A Maxtor 72004AP Seagate Medalist 2510 (model ST32510A) Seagate ST32550N Fujitsu MPE3084AE Quantum ProDrive LPS Quantum ProDrive ELS Contact me off list for more info

22 years, 4 months

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