test-drb October 2001

test-drb@ccmp.vtda.org

259 participants
770 discussions

by mcguire＠neurotica.com

On October 15, Tony Duell wrote: > > > Ahh, the 74LS181s are ALUs, as is the 'F582. Interesting that they > > >used both. I'm curious...what kind of processor is this? > > > > Am I the only one who finds it a bit perverse that there are 74xxx standa= > > rd > > TTL circuits for such complex functions as ALUs? I thought that the way t= > > Actually, what suprises me is how _simple_ the 74181 gate schematic is > (it's published in most TTL databooks). It doesn't take that long to > understand how it works. > > In terms of the transistor count, I suspect there are TTL chips which are > more complex than the '181. The '181 is even used in the pdp11/04 and /34 if memory serves. Anyone know of any others? -Dave -- Dave McGuire Laurel, MD

23 years, 6 months

Twiggy Find

by jrkeys＠concentric.net

I purchased a plastic bag mixed with new and used 5 1/4 floppy diskettes and inside the middle was one of the famous "Fileware" or Twiggy diskettes with it's sleeve used with the Lisa I. I could not believe my luck as I had just watched one of these go for almost $50 dollars on eBay for just one diskette awhile back. Now I just need to find a twiggy drive or better yet a Lisa I. :-) Yes I went back to the thrift store looking for more disk but no luck. The cost of the package was $1.40 for about 20 diskettes.

23 years, 6 months

ArcNet and the Pursuit of Multiple Topologies

by mythtech＠Mac.com

>When I installed PhoneNet stuff into my mother's all-Mac shop, it >specifically uses the yellow-black pair of standard (US) phone >wiring and the documentation explicitly shows it as such. They >even had a sort-of passive hub for your wiring closet to collate >all the black-yellow pairs for a larger (floor-sized as opposed to >room-sized) network. We had six Macs and one LaserWriter on the same >floor of a smallish retail establishment, so it wasn't a problem. >I can see networks near the edge of their physical spec falling off >a cliff, though. Yeah, phone net was designed with the idea that you would piggy back it over your existing phone wiring... the theory being that a standard house/business would be wired either all serial (one jack to the next) or in a star (all jacks coming back to a central punch block). Following this assumption, it was specifically designed to work over the unused pair (being yellow/black in standard station wiring). All PhoneNet REALLY cares about is having two wires from one box to either the next box, or to a central hub. It need not be twisted pair, and it need not be the yellow/black pair. Although, if you choose to use a different pair, either you need to make sure you wire it to the correct pins on the jack (and thus fake a y/b) or you will have to cut a custom wired flat cord as the boxes all expect the wires to be the outer two wires in an RJ-11. But there is nothing stopping you from using unused pairs in Ethernet and just use a custom flat cord (or break them out into their own jack). The single biggest problem with Phone net that I ran into was it was VERY picky over the wiring being correct. Unlike phones, you could not safely reverse pairs in a serial setup. Also, the fact that it expects there to be either serial wiring, or star wiring falls thru in most phone lines. And even depending on the unused pairs wasn't a surefire idea. In every Phone net system I installed, I was forced to do some degree of rewiring, or correcting the wiring. POTS phones are very forgiving to poor wiring, and many telco installers use that as an excuse to be lazy. In almost all POTS phone setups you will find some degree of "non spec", things like unused pairs not being connected, reversing pairs, mixing star and serial wiring, tapping mid line into a drop to extend for a new jack. Tapping was DEATH to phone net, it was the single worst thing you could do, as it caused things like ghosting (items showing up after they have been removed, or showing up more than once on the network), and random dropouts of networked devices. It also proved hard to track, as you almost had to physically trace every wire, looking for a tap. But all things considered, phone net was a much more econimical way of wiring a localtalk network. True localtalk cables were very expensive compared to cheap 2 pair phone cable, so even with rewiring, it still worked out to be the less expensive way to go. Even today, phone net works as a nice quick and dirty network when all you want is printer sharing. I keep a 25ft retractable cord and phonenet connectors connected to a Localtalk to Ethernet bridge. It lets me connect old Macs to the network (or my Newton) on the fly, and I can set it up anywhere in my office. When I am done, I just unhook the phonenet box, and let go, the retractable cord rewinds and pulls the box back to my hub shelf, where it hangs waiting for my next use. -chris <http://www.mythtech.net>

23 years, 6 months

IIgs using hard disk 20

by dhquebbeman＠theestopinalgroup.com

> BUT... predating that was a "Macintosh Hard Disk 20" that was not scsi. > Rather is was some drive (don't know what kind, but MFM seems sensible > enough) that used a special adaptor board that enabled it to plug into > the disk drive port on a bunch of the older macs. It was all enclosed > (drive, power supply, adaptor board) in one nice zero footprint beige > case (back when beige meant brown, and not grey like "beige" computers of > today). In spite of the now long-extant senility, I seem to recall that these interfaces through the serial port, not the floppy port. Regards, -dq

23 years, 6 months

looking for documentation for 1963 minuteman missile computer

by mcguire＠neurotica.com

On October 16, Gene Buckle wrote: > > According to at least one movie I watched the part that is critical are > > some special triacs so that each charge can be detonated within a fairly > > tight time window. > > Klystron(?) I might be wrong though. I keep thinking it begins with a > "K". For the gun type, all bets are off - it's a _much_ simpler design. That would be "krytron". A Klystron is a microwave oscillator tube. -Dave -- Dave McGuire Laurel, MD

23 years, 6 months

AIM65 items in Toronto

by paul＠orchard.wccnet.org

M H Stein: I asked about possible 6502 and 68000 items you mentioned on this list, but I never heard a reply from you. Is the AIM65 stuff still available? Paul R. Santa-Maria Monroe, Michigan USA

23 years, 6 months

SCSI problems

by ghldbrd＠ccp.com

A friend has a 9 gig Seagate drive and an Adaptec 1542C card and is having a helluva time getting it to work with a late model motherboard. boots okay from an IDE drive, but the aforementioned setup hangs almost every time. Do you know of an incompatibility with the drive and card; i.e. too much drive for the scsi bios to understand??? Gary Hildebrand

23 years, 6 months

ArcNet and the Pursuit of Multiple Topologies

by pete＠dunnington.u-net.com

On Oct 16, 9:33, Douglas Quebbeman wrote: > > Now I'm thinking that the "T" in "10BaseT", "100BaseT4", etc. and the T in > > the line capacities "T-1", "T-2", etc. are the same thing. > > Is that true? > > I thought the 'T' in 'T1' stood for "trunk", as in trunk line... That seems very likely, given that it was invented by AT&T in the late 50's/early 60's. I'm fairly sure that's what they used the technology for originally. -- Pete Peter Turnbull Network Manager University of York

23 years, 6 months

Fwd: [GreenKeys] Need help in the Denver area

by jfoust＠threedee.com

Eric Smith <eric-no-spam-for-me(a)brouhaha.com> is in trouble in the Denver area, if anyone can help... - John >Date: Fri, 12 Oct 2001 14:16:28 -0700 >To: greenkeys(a)qth.net >From: Don Robert House <drhouse(a)nadcomm.com> >Subject: [GreenKeys] Need help in the Denver area >Sender: owner-greenkeys(a)qth.net >Reply-To: Don Robert House <drhouse(a)nadcomm.com> > >Eric Smith is driving coast to coast to deliver some rare computer and teletype equipment. The U-Haul truck broke both rear springs. He needs to off load the truck in the Denver area and make arrangements to come back later with a different truck. Is there anyone out there that can help us out? >Eric's cell phone is: (408) 838 3733 > >Thanks for any leads, > >Don >-------------------------------------------------------- >Don Robert House, N.S.E. >Curator, NADCOMM >North American Data Communications Museum >3841 Reche Road >Fallbrook, CA 92028-3810 >760-723-9943 Office >760-723-9984 FAX >URL: http://www.nadcomm.org >e-mail: drhouse(a)nadcomm.org > > >---- >Submissions: greenkeys(a)qth.net

23 years, 6 months

Dark Tower - any internals info out there?

by mythtech＠Mac.com

>Does anyone know if there is any info to be had about how the innards >of games like Dark Tower function. I've never seen inside one but I >presume there's a custom chip that's a microprocessor, RAM and ROM >all rolled into one, for cost reasons. I think I still have mine, and in working condition. Although I would not be willing to part with it (thus why I think I still have it), I CAN open it and send some digital pics of the chips. Maybe even draw out some schematics. I would guess that based on its age, there is nothing fancy in there. Probably a simple eeprom or something for storing your stats, and everything else was probably random gates (fighting, spinning, whathaveyou). As far as "emulation" goes, I would think you could just write it from the ground up following the rules of the game. Although, it wouldn't be a true emulation, it would make it playable (and you could do it networked EASY... now THAT would be a cool internet based game!) -chris <http://www.mythtech.net>

23 years, 6 months

ArcNet and the Pursuit of Multiple Topologies

by pete＠dunnington.u-net.com

On Oct 12, 13:46, Eric J. Korpela wrote: > Just wired the house with Cat-5 this week. 10bT has the advantage that it's > also 100bT with a change of equipment. (ISTR that you can use the > unused pair in the cable for LocalTalk, but I haven't yet tried it). That's true, you can run all sorts of things over Cat5 "structured wiring", in fact that's the point of structured wiring. 10baseT uses two pairs (pins 1+2, 3+6), the phone uses the centre pair (pins 4+5). ISDN uses all four pairs. Serial lines use either the middle pairs (for Tx/Rx) or all four (DTR/DSR, Tx, Rx, RTS/CTS) if they follow the DEC (and other) system. Some use the same pairs as Ethernet (which means a crossover cable for Ethernet also works as a null-modem for Tx/Rx on serial lines). 100baseTX uses the same pairs as 10baseT. You're not supposed to run a phone line (pins 4+5) on the same cable as an Ethernet (pins 1+2, 3+6); it breaks the spec. However, you'll normally get away with it with 10baseT, and it *may* work for 100baseTX over short distances. It certainly won't work for 100baseT4 (does anybody still have any of that?) or 1000baseTX (Gigabit) because they use all four pairs. Nevertheless, you can buy little boxes which are essentially a Y-piece for phone+10baseT -- you need one at each end of the cable. They consist of a small box with two RJ45 sockets and a short Cat 5 lead ending in an RJ45 plug. You can also get similar boxes to combine/separate two 10baseT signals (they move the second signal from pins 1+2 and 3+6 onto 4+5 and 7+8) and ones to simply double up the sockets (pin 1 to pin 1 to pin 1; ... ; pin 8 to pin 8 to pin 8) which are sometimes used for ISDN. For some reason they tend to be different prices, and all overpriced (over here they cost ?8 - ?15, though you can make one for about ?3 including the cost of the box to put the PCB in). I'd be wary of running Localtalk over a cable carying a phone or Ethernet signal. Again, it might work, but it will probably generate interference which might be hard to track down -- I write from experience[1]. Better to use one cable for one service at a time. The real reason for using different pairs for different services is partly serendipity, and partly to avoid damage if you plug the wrong device into a cable which is already connected to something incompatible at the other end. In my workshop and study I have quite a lot of Cat5 (actually Cat5e, the Cat5 standard is officially obsolete) which I use for 10baseT, 100baseTX, serial lines, ISDN, a phone line, and even the audio to the speakers. I'm about to add a couple of Econet adapters, and I'll probably use it for some LocalTalk (PhoneTalk) when I get round to sorting out the non-Ethernet Macs. [1] More than one bad experience, but exemplified by the occasion when I had to make a trip to Northern Ireland with a couple of technical staff >from Acorn to visit some schools who had networking problems. The school staff insisted everything was done to the standard, but it turned out that their erratic network problems were due to putting LocalTalk down the existing network cables. It had worked for a while, but when they extended the networks, both suffered. -- Pete Peter Turnbull Network Manager University of York

23 years, 6 months

Dark Tower Pics

by mythtech＠Mac.com

A few pics of the controller to Dark Tower have been posted. You can find them at <http://www.mythtech.net/darktower>. (Pic #28 is missing, it is the same as 29, just out of focus). The board is about 7" x 3" (17.5cm x 7.5cm) There isn't a whole lot on it. 3 lights down the middle that are socketed, an LED digit display, a pair of LEDs (IR send and recieve, it is used with the picture disc to determine what pictures are facing out), there are a handful of resistors, a few Capacitors, 3 transitors (9112 D 07; 9113 D 05; NP2 3704) a choke coil, 2 diodes, and 3 ICs. The 3 ICs are all Texas Instuments, photos of them are on the web site (I made sure you could read the numbers, but they are upside down right now) The two connector looking things on the very end of the board opposite the LED digit display... are in fact connectors. The white one tied to the motor, speaker, and batteries, and the black one tied to the push button panel for user interaction (the push buttons are a flat 3 x 4 pressure panel connected to the board by a ribbon cable.) That is about it. I will try to draw up some basic schematics later (I'm a little busy at work right now, hopefully I will get to it later this week, or maybe next week). I don't know if I will be able to do any testing of my unit. When I opened it I found batteries had been left it in, and leaked. There is some pretty bad corrosion of the largest IC where the battery acid dripped on it. I am hoping it will still work when I clean it and put it all back together, but there is a chance it has been damaged. Also, the LED digits have suffered some damage (the laminate cover is peeling back >from corrosion) I will post again when I have the schematics done. -chris <http://www.mythtech.net>

23 years, 6 months

Collections vs. accumulations, was Re: How many collectors?

by DAW＠yalepress3.unipress.yale.edu

For me, There is only one criteria for collecting - does it pique my interest in some way? If it does, I'll add it to my classic computer collection, and proceed to use it, for something... :-) --- David A Woyciesjes --- C & IS Support Specialist --- Yale University Press --- mailto:david.woyciesjes@yale.edu --- (203) 432-0953 --- ICQ # - 905818 ! -----Original Message----- ! From: Hans Franke [mailto:Hans.Franke@mch20.sbs.de] ! Sent: Tuesday, October 16, 2001 3:10 PM ! To: classiccmp(a)classiccmp.org ! Subject: Re: Collections vs. accumulations, was Re: How many ! collectors? ! ! ! > >Vintage computer collecting is really no different from ! many other forms of ! > >collecting, its simply less common. ! ! > >Vintage car buffs clearly are more advanced in their ! restoration and repair ! ! > >Firearms collecting (in the USA) is probably the most ! similar form of ! ! > >In all these forms of collecting, as well as stamps, ! coins, and any antiques, ! ! > Two basic types of collector, those who assemble sets of ! items of value, ! > whose value is enhanced by completeness of the set, and ! those who collect ! > examples of fine craftsmanship and items of special merit ! compared to there ! > contemporaries. Most of my favorite systems I would be collecting ! > regardless if they are rare or common. Things I hunt down ! mostly because ! > they are rare, often prove much less satisfying to own than ! to look for. ! ! Well, I still go for a variation of Murphey's law, which I found ! to fit at least my experiance: ! ! As soon as you aquired someting you belive to be truly rate and ! unique, A second incarnation will popup close thereafter. ! ! And as a bylaw it's stated: ! ! The price asked for the second item is as lower as more you did ! spend on the first. ! ! I got again the proof right after I returned last week: ! ! This summer I found a original tool box for a BF 109 figher ! (basicly a big wooden chest), and I payed a premium to haul ! it home ... now a good friend of mine, which I was teasing ! with my find literaly stumbeled across exact the same chest ! in an old basement - and got it for free! ! ! Well. ! ! Gruss ! H. ! ! -- ! VCF Europa 3.0 am 27./28. April 2002 in Muenchen ! http://www.vcfe.org/ !

23 years, 6 months

New aquisitions: PCjr (minus power supply) and Amstrad PC 6400

by mythtech＠Mac.com

>To make this perfectly clear, I need the external 110VAC to 16.7VAC >part, not the internal AC->DC part. well, it has been a while since I looked at one, but if I understand you, you want the big black external brick that goes between house current and a small round power plug on the PCjr... right? That is what I think I have one or two of still kicking around. The one I was picturing in my mind (and why I was thinking of an odd right angle plug), was a power brick to an old HP Deskwriter... I realized that about an hour ago, when I kicked the HP brick that was sitting on my floor. Now, the problem is, I might have been thinking of the HP brick when I was thinking I might have a PCjr power brick... but I will still look, just to make sure. (If I have a PCjr one, I know where it would be, it is just a matter of getting to it) -chris <http://www.mythtech.net>

23 years, 6 months

SCSI problems

by dhquebbeman＠theestopinalgroup.com

> Not to mention that you can't get a refund, you pay $5 or $6 to get in > whether you buy or not, and you may never see the same vendore ever again. > Most "new" stuff are factory seconds/refurbs and they don't tell you that > the warranty doesn't apply (saw one guy pulling the "refurb" stickers off > boxes at one iI went to in Louisville last year) Not all of the vendors are > crooks but there sure is a high percentage. Well, I bought a membership and expensed it out to $CURRENT_EMPLOYER, and they pay for the parking too... but generally you'd be right. There is one motherboard seller selling refurbs, clearly marked, and ditto as maybe or maybe not functional. But a few things do carry a warranty, and I see the same faces and company names almost every time (especially the non-hardware guys like Hacker Hut). At least 50% of the vendors are local and have storefront operations. Russ, are you in Fort Knox? I see you mention the area from time to time, we should get together sometime for a pizza at Impellizeri's... -dq

23 years, 6 months

RS6000 7012-320H

by ken＠seefried.com

>If the internal disk is SCSI, you could attach it to any other system >(for example Linux), and write a utility that goes through the raw >disk looking for 'root:$[^:]*$:0:0:' and replace it with 'root::0:0:\1' Good thought, but it's not quite that easy. As I recall, AIX defaults to the JFS file system. This is an IBM proprietary, journalized filesystem, and would not be trivial to "write a utility" to safely modify it. Standard Linux (or any other Unix, for that matter) will not recognize it. Luckily, there is a Linux port of JFS (http://oss.software.ibm.com/jfs/). I dunno if it will mount a native JFS filesystem from a legacy AIX box, but it should show you what you need to do to get started. Oh, yeah...AIX stores passwords in /etc/security, or somesuch odd directory. Wants to be a TCB, but isn't really a TCB. I liked and respected AIX...but then I didn't pretend it was really Unix. Ken

23 years, 6 months

Semi-OT : 4063 pinout

by ard＠p850ug1.demon.co.uk

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23 years, 6 months

Looking for 1990s manuals/software

by vcf＠vintage.org

I need the following software packages for a project I'm working on: Aldus Freehand 2.0 Aldus Freehand 3.0 Adobe After Effects 3.0 Macromedia Sound Edit 16 1.0 I would prefer the whole software package but at a minimum I need the manuals. Please contact me directly at <sellam(a)vintage.org> if you've got them. Thanks! Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org

23 years, 6 months

SCSI problems

by dhquebbeman＠theestopinalgroup.com

Chad etched into stone for all eternity: > Douglas Quebbeman wrote: > > Picked up a 1542CF almost two years ago at a MarketPro show for $19.95. > > > > We had a Market Pro show here once or twice. They had nothing that I > wanted. It was almost all new stuff and the prices were kind of high. > > The show I go to here in Michigan is called A1 Supercomputer sales, I > think. It is a locally run ( I think) chain of shows. They usually > have a good mix of new and used. The more used, the better for me :-) They do tend to be high, new Americans seeking their fortunes... but a few people carry surplus stuff, and it tends to be priced better if it isn't so decript as to be not worth buying (but perhaps worth picking up off the trash pile). I picked up VB 5 Pro a few years back for $50, and VC++ 5 for the same. But one vendor screwed me out of a academic VB package that came with NT; he had it priced for $50, I made the mistake of asking if it was for real, and immediately it became not so. -dq

23 years, 6 months

"Early" 3.5" diskettes (was: Wired covers VCF east

by mbg＠world.std.com

Allison, I'll have to show you the machine... maybe you could identify the drive right off without having to open the case. For a preview, check out the wired.com article pictures... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+

23 years, 6 months

looking for documentation for 1963 minuteman missile computer

by technos＠nerdland.org

On Monday, October 15, 2001 9:25 PM, Carlos Murillo [SMTP:cmurillo@emtelsa.multi.net.co] wrote: > Rocket science is in the rocket engine. Navigation is > not that hard, comparatively... > When all you have to navigate with is a computer that takes a full second to multiply and a telescope that could probably only sense the horizon it gets a bit harder.. Jim > At 03:12 PM 10/15/01 -0400, you wrote: > >Let's hope they're all bought up by domestic hobbyists... > > > >;-) > > > >-dq > > -------------------------------------------------------------- > Carlos E. Murillo-Sanchez carlos_murillo(a)nospammers.ieee.org

23 years, 6 months

Philbrick?

by mranalog＠home.com

Sat, Oct 13th John Allain wrote: > I appreciate all the responses. > So why computor tubes and not computer? > I guess it's possible that the tubes were replacements > and weren't spec with what GAP meant to use. Since I didn't know the answer I asked someone who was a Philbrick employee from 1949 to 1966. "Hi, Doug: The standard rationale was that the purpose of the spelling was to differentiate between machines that did computing and people who were employed to do so. For example, my wife's roommate, in the early days of her post-college life, had a math degree and was employed at MIT's Whirlwind lab as a "computer", doing computing tasks that were too complex for the digital machines then existing. However, I think that George really invented the term (a) because it was attention-getting, (b) to differentiate his product from the competition, and (c) because he always liked to do things a little differently and more creatively than the next guy." ========================================= Doug Coward @ home in Poulsbo, WA Analog Computer Online Museum and History Center http://www.best.com/~dcoward/analog =========================================

23 years, 6 months

looking for documentation for 1963 minuteman missile computer

by jtinker＠coin.org

Wow, even a users group! This is great. The boards are beautifully done, discrete logic, and dipped in a conformal coating. Each transistor or diode has its own serial number, which I assume provides traceability to quality control. The card cage is cylindrical, and surrounds where the "stabile platform" would go, except they were removed before the computers were surplused, for reasons of secrecy. I heard once that the whole thing cost about $1/2 million, half for the computer and half for the stabile platform. There is a port in the card cage where a telescope on the stabile platform gets to look out at something, presumably the sun or stars. Thanks for the info, John Tinker 10/15/01 3:02:34 PM, "Peter C. Wallace" <pcw(a)mesanet.com> wrote: >On Mon, 15 Oct 2001 jtinker(a)coin.org wrote: > >> I'm looking for documentation for a 1963 minuteman missile navigation >> computer. Any leads would be appreciated. >> >> Thanks, >> John Tinker >> >> >> > > >I have a little info if it's the D17B (1962) > >(from "Proceedings of the minuteman computer users group" Tulane Univ >1973) > >Type: Serial synchronous > >Number system: Fractional binary fixed point 2's complemant > >Logic levels: 0V = false, -10V = true > >Data word length: 11 or 24 (double precision) > >Instruction length: 24 bits > >Intructions: 39 > >Maximum I/O words/Second: 25600 > >Execution times: add ~78 uSec, multiply ~546 uSec, Double prec multiply >~1015 uSec > > >Memory: 24 bits + 3 timing bits >Type: Oxide coated disk >cycle time ~78 uSec >Capacity 5454 words 2727 double prec (24 bit). > >I/O: 43 digital lines, 31 pulse type, 12 analog (from 3 8 bit A-D) > program I/O 800 5 bit c/s > > >Size: 20" high x 29" diameter > >Power 28VDC +- 1V @ 17 A > >Circuits: DTL+DRL double copperclad gold plated glass fiber laminate >with polyurethane conformal coat > > > >The newer D37C (1964) is mostly the same except has a larger disk and more >instructions > >Peter Wallace >Mesa Electronics > >

23 years, 6 months

Almost Free, for pick up only in Michigan MicroPDP11/73

by fernande＠internet1.net

Hello All, Please respond privately.... this is going to two lists. I have a Micro PDP11 that I would like move to a new home. It is an 11/73 that uses the CPU board from the 11/83. It is the 18mhz J11 CPU with FPU (M8190-AE). It currently has 2megs of ECC memory, although I have about 3megs worth of parity that could be swapped in instead. Various other boards are included (no scsi boards :-) It is in the tower mounted BA23. The case is clean, but has a few flaws.... scratches and the base is cracked, and one of the little horns? where the back cover fits it cracked. Overall the case looks very nice. The steel chassis itself could use a vacuum, However. I could get into he ROM with a terminal, but never got it to boot from the RD54 HD. It complained of a bad controller (m7555). I have spares, but never tried them. It could be the drive as this particular PDP11 has a bad history with drives according to the documentation that came with it. The main reason I would like to move this on, is because I don't have the time to learn about it. I know nothing of the PDP11 OS's. Plus I have a Vax that I would like to get working, and lots of other little projects. In the subject line, I state "almost free". I do have some money in it, and would like to recoup at least some of it, so I'd like to get $40 for it. That's certainly much lower than what it would fetch on Ebay. I live in Battle Creek, MI. It's right off of I94 about 1/2 way in between Detroit and Chicago. Here is the info on the cpu board from the field guide: M8190-AE KDJ11-BF Q/U 11/83-84 CPU J11 CPU 18MHz with 2 boot & M8190-AE diagnostic ROMs, FPJ11-AA. M8190-AE Refs: EK-KDJ1B-UG, uNOTE N#025, N#030, N#035, N#039 Thanks, Chad Fernandez Michigan, USA

23 years, 6 months

IIgs using hard disk 20

by mythtech＠Mac.com

>Sometimes I have to power cycle the whole thing to get it to boot, do >I'm thinking that the drive might be going bad. If it doesn't boot when you first turn it on, you might not have let it come up to speed fully. It takes a good 20-30 seconds to come up to speed before you can turn the mac on. The drive light will turn on, then start blinking steady, after about 20 seconds, you will hear the drive click a whole lot, and the light will blink rapidly for about 2 seconds... after that, it is up to speed and safe to turn on the Mac and try booting. -chris <http://www.mythtech.net>

23 years, 6 months

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test-drb October 2001