test-drb

test-drb@ccmp.vtda.org

101090 discussions

by dm561＠torfree.net

-------------Original Message: Date: Wed, 04 Mar 2009 17:47:06 -0800 From: "Chuck Guzis" <cclist at sydex.com> Subject: Re: 1" paper tape buy ? On 4 Mar 2009 at 19:32, Roy J. Tellason wrote: > > I haven't been following this thread very closely, but I trust > > someone has mentioned the 96 column System/3 mini-card: > > > > http://homepages.cwi.nl/~dik/english/codes/96col.html > > > > Holds more characters, but less data than a standard 80 column card. > > That was the one roughly the size of a 3.5" floppy, wasn't it? I worked at a > place once that used those... Yep, about that size. What made no sense to me is that each column is BA8421 - 6 bits. This long after IBM had settled on 8-bit EBCDIC. Most installations had standardized on the 80 column card, so it didn't make much of a splash unless you were a System/3 installation. Cheers, Chuck ---------------Reply: Well, it may not have been a big splash relatively speaking, but they were certainly used a fair bit by Burroughs, especially in the era of the B1700. And to get back to the original topic, I don't see any mention of edge- punched cards, sort of like fanfold paper tape but card stock, wider, and with prepunched feed holes; many readers and perfs could handle both PPT and EPCs. FWIW, the ones I have here are 3"x11". mike

17 years, 3 months

Beautiful Digital Group Z80 system on eBay

by wmaddox＠pacbell.net

Any Digital Group fans here? It's being offered for a $2000 buy-it-now, item # 310126675985. No relation to the seller. --Bill

17 years, 3 months

is it possible to rebuild old c64 hardware enhancements?

by dgahling＠hotmail.com

its just a disclaimer for the a/r... now that you mention it there is a usb type interface abd 1541 on flash usb (so to speak) ---------- Sent via Telus My Email 2.0 -----Original Message----- From: Zane H. Healy Sent: 3/5/2009 3:39:34 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: is it possible to rebuild old c64 hardware enhancements? At 9:36 AM -0500 3/5/09, Dan Gahlinger wrote: >I was thinking about things like the "super card" >and other drive/ copier enhancements that were made back in the day. > >I even had something from (super card I think) called "IHS Nibbler" >(Index Hole Sensor) nibbler. >which was a hardware/software copier mix, one part went inside the drive. > >I remember the "super card" had many different things, like a "ram >card" that went inside the 1541 drive. > >is it possible to recreate these things? (I dont have any hardware any more) > >I doubt anyone owns the copyrights now, or alternatively I bet a >"generic" hardware device could be made... You really like making claims about copyrights don't you? Even I am noticing a trend here, and I don't spend much time reading the list anymore. Or are you simply a Troll? Personally I'm more interested in new hardware that incorporates aspects of old hardware for my C-64, and have purchased three new items in the past year. So maybe this does answer your question, yes, it is possible to recreate some of these old upgrades, but I'm not of anyone making specifically what you're talking about as I've not had any reason to look for them. For all I know it's already built into the one device I have, or can be added to it. Zane -- | Zane H. Healy | UNIX Systems Administrator | | healyzh at aracnet.com (primary) | OpenVMS Enthusiast | | MONK::HEALYZH (DECnet) | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | PDP-10 Emulation and Zane's Computer Museum. | | http://www.aracnet.com/~healyzh/ |

17 years, 3 months

Intersil Intercept Jr

by jeflittl＠cisco.com

To Whom it may Concern: What is all this stuff about the Intercept Jr? I was the designer of that little demo computer way back in the 1970s when I was working for Intersil. If anyone get's this message, are there some specific questions you might have? I still have several of the early proto units in my garage along with a lot of the original documentation. I see that someone is asking about getting replacements for the little micro-interpreter chip used in this design. Unfortunately it is not really possible to get new chips because the original was really a mask-programmed CMOS ROM that Intersil was using the Intercept Jr as a demo vehicle for (in addition to the 6100, the CMOS RAMs, and the support chips). There was also a larger version called the Intercept that I designed and we built first which was a full-blown PDP-8/E equivalent with 4K of 12-bit RAM, a full front panel, and a current-loop async serial interface that could be connected to an ASR-33 teletype and would run a full set of Digital diags and 4K-version software. After I left Intersil I believe they continued to develop additional peripherals for the Intercept and the Intercept Jr. including a memory extension controller based on the Digital version, a floppy disk controller, some special Intercept Jr. demo plug-in cards used in various educational settings such as the 6100 training courses that Intersil offered to their customers. I believe eventually the Intercept was capable of running OS/8. That required a 2-bank memory of 8K of 12-bit RAM as I recall. Regards, Jeff Little Menlo Park, Calif. PS: don't forget that the PDP-8 was basically organized around 12-bit words, not bytes.

17 years, 3 months

Looking for a half height cab (DEC if possible)

by silvercreekvalley＠yahoo.com

Anyone in the UK got a half height cab (DEC would be great) for sale/trade. Will collect. Contact me off list if anything available. Cheers. Ian.

17 years, 3 months

Eastbound hauling

by wdonzelli＠gmail.com

I will be on the West Coast (San Diego thru the Bay Area) in early May, driving with my trailer and van (I do this every year). In order to fund the trip, I offer moving services basically across the country, back to New York and points between. I can move rather large machines - two caccooned six foot racks can ride on my trailer, plus maybe a rack in the back of my van. I can also move terminals, drives, whatever. My trip westbound is pretty full from New York to Boulder, CO. There is a possibility of westbound movement from Boulder to California. Please contact me off list. Sooner is better than later. -- Will

17 years, 3 months

1" paper tape buy ?

by csquared3＠tx.rr.com

> Date: Wed, 04 Mar 2009 00:41:07 -0800 > From: Brent Hilpert <hilpert at cs.ubc.ca> > CSquared wrote: >> >> On Mon, 2 Mar 2009 11:41:14 -0800 Rich Alderson <RichA at vulcan.com> said: >> >> >> From: CSquared >> >> Sent: Friday, February 27, 2009 2:53 PM >> >> >> I also seem to recall that Univac or some other computer manufacturer >> >> actually used a 90 (?) column card for even better packing density. >> >> I'll leave that improved calculation to someone who actually remembers >> >> how many columns those cards were blessed with. >> >> > Univac 90-column cards are Hollerith cards just like the "IBM" cards. >> > They consist of upper and lower groups of 45 columns of 6 round punches >> > (instead of the rectangular punches favoured by IBM). >> >> Interesting. I don't know how I remembered the 90 columns as I never >> worked with a Univac computer - only IBM's and various minis which mostly >> didn't even have punched card readers at all. I'm not real sure I've >> ever even seen one of the Univac punched cards. Your description >> of the hole grouping sounds like maybe they encoded characters as >> 6-bit codes vs. the "12-1 is an A", "12-2 is a B" scheme used by IBM. >> I'm not real sure that's even correct either - it's been a right good while. > > It doesn't present the full encoding but there is a picture and some more info here: > http://www.fourmilab.ch/documents/univac/cards.html > > The labelling on the card suggests the numeric digits were punched in biquinary > format. I'm going to guess that that goes back to the origins of that card type > when only numeric data where utilised, and that alpha & punctuation were added > later, using the remaining 6-bit binary patterns. I was just about to say I had never seen one of those, but then I seem to recall the Dallas-Ft. Worth turnpike also used Univac punched cards as tickets now that I think about it. That former turnpike has been a freeway (just another segment of I30) for quite a few years now. Perhaps that is the source of my hazy memories of those cards. If the coding is bi-quinary as the web site suggests, that brings back other unrelated memories of the adder in the IBM 1401. Of course I'm sure those show up in other machines as well, but that was my first encounter with them in about 1962 or so. That looks to be a very interesting web site for many reasons, though those cards were not what I visualized. I have another vague memory of a card with oval holes (longer in the vertical dimension) with the 90 holes all in 1 row rather than in 2 rows as the web site shows. Now I'm going to have to do a bit of searching to see if I can find something that matches that memory.

17 years, 3 months

Emulex UC17 UNIBUS SCSI boards

by erikb＠digischool.nl

Hi folks, With all this talk about QBUS SCSI boards I thought I'd mention that I have three Emulex UC17 UNIBUS SCSI boards available waiting for the right deal. They came from a professional outfit and were tested (and found working) two weeks ago. These are simply awesome. Contact me off list for details, I won't bite. Greetings, Erik

17 years, 3 months

Stardent - Kubota Pacfic - Tektronix

by mikelee＠tdh.com

Hi, I recently picked up in a lot of other stuff four DC600 tapes which is an interesting mix. I have no idea what systems they are for, maybe you do or have a need for such? Stardent 2.2 Diagnostics 1989-Part #125-0023-06 Kubota Pacific Computer 2.5 Diagnostics 1992-Part #125-0023-11 An unlabeled Tektronics tape, and another unlabeled 3M one. Mike

17 years, 3 months

rsts/e 7.2 tape images?

by brad＠heeltoe.com

I see someone is selling physical 9-track backups of rsts/e v7.2 RL02's on ebay. that's cool. Does anyone have tape images of RSTS/E 7.2? I've seen 7.0 and 9+ but I'd like 7.2 for uda50 support. I've seen one on the web but it says the tape had read errors. -brad

17 years, 3 months

Can I use a M9302 with a PDP 11/35?

by silvercreekvalley＠yahoo.com

Hi, Before I do it - I thought I should ask :) Can I use a M9302 as a UNIBUS terminator in a PDP 11/35 or 11/40. The manual mentions a M930 which I don't have, but I do have the M9302 which looks a bit more involved (has some ICs. The M9302 was from a 11/34 which is a later generation. Having said that, the 11/35 does work without the terminator - although I cant see a terminator on the system. Thanks Ian.

17 years, 3 months

Cleaning Cases

by steve＠radiorobots.com

Hi, Any comments on use of peroxide to freshen cases? http://retr0bright.wikispaces.com/ I thought many cases were RIM and were something other than ABS as mentioned in link. Steve

17 years, 3 months

S-100 power supply voltage ranges

by ajp166＠bellatlantic.net

Some S100 chassis had multiple primary taps, CVT or a in the case of Inetgrand {and a few others} boxes regulators. The problem is the early machines had to have really robust transformers as the +8V bus could easily be 25A using early boards. By 1980s with 64k ram cards (64k on one card) and multi serial IOs on one board a typical system might take from 3-5 board at far lower current than the earlier 4k ot 8k based memory systems. The side effect fo that was the bus voltages being upregulated would float higher and regulators would run really hot. Near the latter days typcail systems were system on a card (z80, 64k or even 128k, 2 serial, FDC and printer port) making the whole load typically under 3-4A at +8V and the need for more boards unlikely. Allison > >Subject: Re: S-100 power supply voltage ranges > From: "Barry Watzman" <Watzman at neo.rr.com> > Date: Mon, 02 Mar 2009 10:42:55 -0500 > To: <cctech at classiccmp.org> > >Actually, the factory fix was a "bucking transformer", a whole second power >transformer installed out of phase in series with the primary power >transformer so that the voltages were subtractive. There is a factory ECN >on this topic. But the bridge regulator solution was common among the user >base (I myself have used it) as a lot simpler and cheaper, and almost as >effective. > > >------------------------------ > >Message: 3 >Date: Sat, 28 Feb 2009 11:07:56 -0600 >From: Jim Battle <frustum at pacbell.net> >Subject: Re: S-100 power supply voltage ranges >To: General Discussion: On-Topic and Off-Topic Posts > <cctalk at classiccmp.org> >Message-ID: <49A96F6C.6060602 at pacbell.net> >Content-Type: text/plain; charset=ISO-8859-1; format=flowed > >Chuck Guzis wrote: >> All of the S100 boards I've seen use simple linear regulators, so you >> >> need some headroom--but not too much. A lot of S100 7805s and LM323- >> 5s were operated within an inch of their maximum current ratings (some >> had bypass resistors installed) and generated a lot of heat. I >> >> wouldn't run the supply rails any higher than I had to. >> >> Cheers, >> Chuck >> >> > >The Sol-20 had an app note about this problem. Apparently they shipped them >for a while with transformers that were out of spec with the end result that >the unregulated power ran high. The recommended fix was to take a power >bridge, mount it to the case, and wire it in series with the positive >voltage run in order to get a ~1.4V drop. > >

17 years, 3 months

Xerox 8010 disks

by dgriffi＠cs.csubak.edu

Here's a list of the Xerox 8010 disks I have. I'm offering them first to the Computer History Museum by way of Al Kossow whereupon they should be imaged and made available to all. And now, the list. 8010 Xerox ViewPoint 1.1.2 BP Help Documents 1Q87 120K17651 VP Spreadsheet 1.1 2Q86 130K02312 8010 Xerox ViewPoint 1.1.2 Installer 4Q86 130K01773 8010 Xerox ViewPoint 1.1 VM Checker 4Q86 130K19480 8000 Series Rigid Disk Diagnostics (10, 29, and 42MB) 7.1 4Q85 130K01831 8010 Xerox ViewPoint 1.1.2 Local RS232C Communication Access 4Q86 130K24940 8010 Xerox ViewPoint 1.1.2 Local RS232C Communication Access 4Q86 130K24940 8010 VP NetCom 1.1.2 (Common Software) 1Q87 130K02033 VP Data-Driven Graphics (Bar, Pie, Line) 1.1 2Q86 130K02201 8010 Xerox ViewPoint 1.1.2 Remote System Administration 1Q87 130K02803 8010 Xerox ViewPoint 1.1.2 Remote System Administration 1Q87 130K02803 8010 Xerox ViewPoint 1.1.2 Remote System Administration 1Q87 130K02803 8010 Xerox ViewPoint 1.1.2 Remote System Administration 1Q87 130K02803 8010 Xerox ViewPoint 1.1.2 Remote System Administration 4Q86 130K02803 8010 Xerox ViewPoint 1.1.2 Remote System Administration 4Q86 130K02803 VP File Conversion of 860 Documents 1.1 2Q86 130K06912 8010 Xerox ViewPoint 1.1 (Essential Applications) 2Q86 130K01812 8010 Xerox ViewPoint 1.1 (Essential Applications) 2Q86 130K01812 8010 VP NetCom 1.1 Network Installation Scripts 2Q86 130K02042 VP List Manager 1.1 2Q86 130K02261 8010 Xerox ViewPoint 1.1 (File Check) 2Q86 130K01851 8010 Xerox ViewPoint 1.1 (File Check) 2Q86 130K01851 8010 Xerox ViewPoint 1.1.6 (Common Software) #4 of 5 1Q87 130K01804 8010 Xerox ViewPoint 1.1.6 (Common Software) #4 of 5 1Q87 130K01804 8010 Xerox ViewPoint 1.1 Basic Workstation #1 4Q86 130K01783 8010 Xerox ViewPoint 1.1 (Basic Workstation #2) #3 of 5 1Q87 130K01793 8010 Xerox ViewPoint 1.1 (Basic Workstation #1) #2 of 5 1Q87 130K01783 8010 Xerox ViewPoint 1.1 VP Object Conversion Utility 2Q86 130K01822 8010 Xerox ViewPoint 1.1 VP Object Conversion Utility 2Q86 130K01822 VP Document Editor 1.1.2 1Q87 130K02123 VP Document Editor 1.1.2 1Q87 130K02123 VP Training Exercises #1 2Q86 130K01842 VP Training Exercises #2 2Q86 130K17071 8010 Xerox ViewPoint 1.1 Basic Workstation #2 4Q86 130K01793 8010 Xerox ViewPoint 1.1 Basic Workstation #2 4Q86 130K01793 8010 Xerox ViewPoint 1.1 Basic Workstation #2 4Q86 130K01793 8010 Xerox ViewPoint 1.1 Basic Workstation #2 4Q86 130K01793 8010 Xerox ViewPoint 1.1 Basic Workstation #2 4Q86 130K01793 8010 Xerox ViewPoint 1.1 Basic Workstation #2 4Q86 130K01793 8010 Xerox ViewPoint 1.1 Basic Workstation #2 4Q86 130K01793 -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

17 years, 3 months

Recommendations for AIM-65 power supply?

by dm561＠torfree.net

-----------Original Message: Date: Fri, 27 Feb 2009 01:04:49 -0500 From: Ethan Dicks <ethan.dicks at gmail.com> Subject: Re: Recommendations for AIM-65 power supply? On Fri, Feb 27, 2009 at 12:49 AM, Josh Dersch <derschjo at mail.msu.edu> wrote: > Title basically says it all -- anyone have any recommendations for a decent > power supply for an AIM-65? ?I have it running right now on just 5V, but I > need something that puts out 24V so I can run the little printer, too :). > ?It'd be nice nice to something small enough to fit inside the enclosure > this thing came in but I'm not that picky. ?My searches on the 'net reveal a > lot of choices, so I'm looking for advice on what to look out for. > > For those playing along at home, the AIM-65 wants 5V at ~2A, and 24V at > ~2.5A. I don't know where to get one now, but my AIM came packaged with a steel bottom, a plastic top, and a PSU that has "AIM65" in the part number and that provides +24V. It looks like many other 1970s open-frame switchers with a large 1/8" or 3/16" aluminum baseplate and one or two power transistors, but unlike the others, it has more than just +5, and +/-12V. So at one point, someone was making 3"x4"x2" PSUs just for the AIM-65. Unless you happened to run across some that someone has as a stash of spares, I don't know where you'd find that exact model now, but it does exist. -ethan ---------------Reply: Well, I do have a 'stash' of about 6 or so but unfortunately (for you) I also have a stash of AIM-65s. As a matter of fact I'm looking at several right now to see just how many are worth saving; I might end up with one or two without working printers, in which case I might have a spare supply. I'll keep you in mind, but meanwhile it shouldn't be a big problem finding 24V somewhere; the required current is nowhere near what the 8" drives used. As Dwight suggests, it oughta be fairly simple to adapt the +/-12V on a PC PS. FWIW, there were at least two suppliers: initially Condor Inc. supplied one (part no. AA524-AIM65), and later Rockwell also supplied a fancier one made by Lestronics (Part no. A65-004-03). The Condor 24V supply looks like just a half-wave diode, cap and Zener. mike

17 years, 3 months

S-100 power supply voltage ranges

by lynchaj＠yahoo.com

Hi! What are acceptable voltage supply ranges for an S-100 power supply? I am assuming 115VAC input. My intended application is a small home brew S-100 backplane. I have seen the S-100 voltage rails vary but I believe +15VDC, -15VDC, and +9VDC would be sufficient. Herb's S-100 page lists the voltages as +18VDC, -16VDC, and +8VDC but I have seen other voltages used. Thanks and have a nice day! Andrew Lynch

17 years, 3 months

Interesting mix...

by geneb＠deltasoft.com

This gent scratch built a Z-80 based CP/M machine and then attached an INMOS transputer chip to it: http://www.yakyak.org/viewtopic.php?f=32&t=71349&start=0> &t=71349&start=0 g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind.

17 years, 3 months

CueCat wanted!?!

by dm561＠torfree.net

--------------------------Original Message: Date: Tue, 3 Mar 2009 10:21:15 -0700 From: Star Master <starmaster at gmail.com> Subject: CueCat wanted!?! With the recent talk of CueCat's being used for BarCode scanners, I would love to get my hands on some of them. I had one about a year ago, and it worked awesome! Could scan about any type of BarCode...books, dvd's, cd's. And if you have a database program, such as DVD Profiler, it works great with it! Unfortunately my dear beloved granddaughter decided to 'play' with the CueCat and, sadly, it is no more.... So if anyone has one (or two or three!) either USB or PS2, I would gladly take it off their hands! Email me and we'll work something out! Thanks! --------------------------Reply: $5.95 too much for ya? http://www.weirdstuff.com/cgi-bin/category/POS000 Also often seen on eBay... mike

17 years, 3 months

Recommendations for AIM-65 power supply?

by dm561＠torfree.net

------------Original Message: Date: Tue, 3 Mar 2009 08:13:37 -0800 From: dwight elvey <dkelvey at hotmail.com> Subject: RE: Recommendations for AIM-65 power supply? > On Sat, Feb 28, 2009 at 8:24 PM, M H Stein <dm561 at torfree.net> wrote: > > FWIW, there were at least two suppliers: initially Condor Inc. supplied one > > (part no. AA524-AIM65)... The Condor 24V supply looks > > like just a half-wave diode, cap and Zener. > Hi Not sure who posted this part. I doubt they are using a single zener to regulate 2.5A. Maybe a zener resistor and transistor but it would be a large zener for that type of current. Dwight -------------Reply: Guilty as charged; I can't trace the circuit or read the diode number, but on closer perusal it is probably a reverse voltage protection diode across the output, and the 24V is completely unregulated. And that same closer perusal reveals a few more diodes, so it looks like a full-wave rectified supply after all. My point was that it's a really basic linear supply; transformer, 4 diodes and a 2200/35 cap (and that diode and a bleeder resistor). Incidentally, these printers were also used in a small National printing calculator, in case you run across one somewhere. mike

17 years, 3 months

Facit 4070 paper tape punch

by tsw-cc＠johana.com

A while ago, I obtained one of these, and have successfully hooked it up to the printer port on (one of) my Linux boxen. It works quite well, and I didn't need to change any software to get it functional. The adapter is housed in a small DB-25 to DB-25 patch box goodie (with the help of a 7400 gate). No problems here (if you desire details, please contact me off list). My problem is that I don't have a proper chad box for this nice punch. It is a clear plastic box that clips over the front of the punch and holds the chad. My temporary solution is to have a plastic bag with some cable ties to the "exit port". While this "works" it isn't ideal. So, I'm looking for a chad box for one of these. Any leads would be helpful. Thanks.

17 years, 3 months

YouTube video to repair screen rot

by legalize＠xmission.com

This demonstrates a technique to repair screen rot on a vintage television set. <http://www.youtube.com/watch?v=5l1EoMmmOcQ> Nekochan.net's blog reports that he used the technique on an ADM-3A: <http://www.nekochan.net/weblog/archives/2008/10/adm-3a-screen-r.html> I hadn't seen this mentioned here before and screen rot problems have come up often in discussions of vintage terminals. He uses a heat gun to separate the layers instead of a nichrome wire as has been discussed here previously. I would feel much more comfortable with a heat gun than with a heated wire! -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

17 years, 3 months

CueCat wanted!?!

by starmaster＠gmail.com

With the recent talk of CueCat's being used for BarCode scanners, I would love to get my hands on some of them. I had one about a year ago, and it worked awesome! Could scan about any type of BarCode...books, dvd's, cd's. And if you have a database program, such as DVD Profiler, it works great with it! Unfortunately my dear beloved granddaughter decided to 'play' with the CueCat and, sadly, it is no more.... So if anyone has one (or two or three!) either USB or PS2, I would gladly take it off their hands! Email me and we'll work something out! Thanks!

17 years, 3 months

Anyone have this article from Creative Computing?

by RMeenaks＠olf.com

@article{Stineman, author = "Russell W. Stineman ", title = "A Consistently Well Behaved Method of Interpolation", journal = "Creative Computing", year = 1980, volume = 6, number = 7, pages = "54-57" }

17 years, 3 months

Ibm 2970

by spedraja＠ono.com

Hi everybody. I am searching for photos or some information related with the IBM 2970. We used these devices in the beginning of the 70's but actually there is nothing available about them here. Could someone help me with this please ? I would agree it a lot Kind Regards Sergio

17 years, 3 months

Recommendations for AIM-65 power supply?

by dm561＠torfree.net

-----------Original Message: Date: Fri, 27 Feb 2009 01:04:49 -0500 From: Ethan Dicks <ethan.dicks at gmail.com> Subject: Re: Recommendations for AIM-65 power supply? On Fri, Feb 27, 2009 at 12:49 AM, Josh Dersch <derschjo at mail.msu.edu> wrote: > Title basically says it all -- anyone have any recommendations for a decent > power supply for an AIM-65? ?I have it running right now on just 5V, but I > need something that puts out 24V so I can run the little printer, too :). > ?It'd be nice nice to something small enough to fit inside the enclosure > this thing came in but I'm not that picky. ?My searches on the 'net reveal a > lot of choices, so I'm looking for advice on what to look out for. > > For those playing along at home, the AIM-65 wants 5V at ~2A, and 24V at > ~2.5A. I don't know where to get one now, but my AIM came packaged with a steel bottom, a plastic top, and a PSU that has "AIM65" in the part number and that provides +24V. It looks like many other 1970s open-frame switchers with a large 1/8" or 3/16" aluminum baseplate and one or two power transistors, but unlike the others, it has more than just +5, and +/-12V. So at one point, someone was making 3"x4"x2" PSUs just for the AIM-65. Unless you happened to run across some that someone has as a stash of spares, I don't know where you'd find that exact model now, but it does exist. -ethan ---------------Reply: A lot of the old dot matrix printers had +5V and ~+24V supplies that would work with minor adjustments (also good for 8" floppy drives); they usually just end up being scrapped anyway. mike

17 years, 3 months

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