test-drb

test-drb@ccmp.vtda.org

101090 discussions

by compoobah＠valleyimplants.com

On Dec 19, 2007, at 6:07 PM, Roy J. Tellason wrote: > And in reading about the various IBM boxes, only one word comes to > mind: "Baroque"! I wouldn't say that- although I admit that on first looking at even the RS/6000 (and later hearing about the AS/400 and S/3XX) was "weird". IBMs are just a different mindset than DECs. A way of looking at it is that IBM moved "downmarket" and DEC moved "upmarket" (similar thing with most of the computers we see: they started out at the lower end, and then later on the manufacturers decided to put together a big machine for certain customers (PDP-10, SGI PowerSeries, Sun E10k, VAX 9000 ...) IBM also had a paradigm early, and those tend to stick.

18 years, 4 months

The 2N2/256-BSCP [was: Homebrew Drum Computer]

by cclist＠sydex.com

> From: Robert Nansel <bnansel at bigpond.net.au> > 1) To build a complete functional computer, including memory, using > no more than 256 2N2222-ish transistors (plus scads of diodes, resistors, > etc.). > > 2) Use no ICs or other parts that wouldn't have been available to > hobbyists ca. 1965. Well, if you put no limit on the number of diodes (just 3 terminal devices), you can go a heckuva long way using tunnel diodes or even diacs. Or you could use magnetic core logic, using transistors only as I/O terminals and clock drivers. Either of those would certainly satisfy the 1965 aspect. Or is the restriction on "negative resistance devices"? Cheers, Chuck

18 years, 4 months

Stride 460 restoration video posted to YouTube

by daviderhart＠oldzonian.com

>On 21/12/2007, Charles Fox <cfox1 at cogeco.ca> wrote: >> A beautiful job both on the computer and the video. The >> music fitted in with the action, and I liked the pans and zooms. A >> computer doesn't move around much, so what else can you do? It's not >> like shooting "dancing with the stars". > >:?) > >Well, that's certainly true! > >I'm improvising here, but I'd like to have seen some details of how it >was reassembled, for instance - what new or refurbished parts were put >in. A time-lapse of the strip-down and reassembly would have worked >well, showing it being torn apart then rebuilt in 30sec or so. Seeing >what sorts of connectors it has, if special cables were made up, >showing the button being pressed for the 1st power-on, things like >that? > >Just some ideas... > Great ideas. I think I have a much better plan for the next restoration project. I was working backwards in this project. Taking what I had available, pictures, video clips, etc. and making a video. Next time I think a plan would be helpful. ;-) I'm thinking about doing a take-apart/put-back-together series of videos for the Sage II (half-height/full-height), Sage IV and Stride 440 and 460. Might be worth capturing for future 'restorations'. david. >-- >Liam Proven ? Profile: http://www.linkedin.com/in/liamproven >Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com >Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419 >AOL/AIM/iChat: liamproven at aol.com ? MSN/Messenger: lproven at hotmail.com >Yahoo: liamproven at yahoo.co.uk ? Skype: liamproven ? ICQ: 73187508 >

18 years, 4 months

The 2N2/256-BSCP [was: Homebrew Drum Computer]

by bnansel＠bigpond.net.au

Thu Dec 20, 2007 at 14:50 Tony Duell said: > > ... > > > > 1) To build a complete functional computer, including memory, > > Are things like core-on-a-rope ROM allowrd? Yes. Encouraged, even. > > > using no more than 256 2N2222-ish transistors (plus scads of diodes, > > resistors, etc.). > > Do all transsitors have to be of the same flavour, or could I use TUNs > and TUPs? I'd never encountered the TUN & TUP TLAs before, so I looked them up: Transistor, Universal NPN/PNP. Neat! And any TUN or TUP will do, provided a device of comparable spec was reasonably available to hobbyists in the mid sixties. For my first efforts, at least, I'll be using the PN2222 in modern TO-92 plastic packages. I'm not sure when the TO-92 package was introduced, but there were definitely plastic package transistors available then. SOTs are right out, though :) > I think I'd start by reading the schematics of the HP9100. It contains > more transistors than that, but it's still amazingly simple. > > Anyway, the flip-flops in that machine were JKs, using 4 transistors > each. ... I'll check that out. Thanks. > > 2) Use no ICs or other parts that wouldn't have been available > > to hobbyists ca. 1965. > > So that preumably means a multi-layer-PCB acting as an > inductively-coupled ROM is out. Rats! I recall seeing a few two-layer boards in hobbyist electronics magazines from the '60s. Certainly you can make multilayer boards out of single-side boards, as long as you don't need to make many connections to the inner layers. > > 3) Must be transportable in the boot of a mid-size sedan (i.e. > > Totally OT, but I find 'boot of a sedan' a somewhat odd expession. > 'Trunk > of a sedan' or 'boot of a saloon car' would seem more natural. Maybe it's an Australian thing. Being an ex-pat Yank in Oz, saying "boot" instead of "trunk" still doesn't come naturally to me, even after more than a year here. Saloon car, though, sounds like a sure way to get a drunk driving ticket :) -Bobby

18 years, 4 months

Stride 460 restoration video posted to YouTube

by daviderhart＠oldzonian.com

I've been having some fun with a Stride 460 tower I'm restoring. Here is a link to the video I made of the Stride 460 restoration. http://www.youtube.com/watch?v=eOx-ZadCGDg The Stride 460 is a 68000 based system from Stride Micro in the mid 1980's. Stride Micro was formerly Sage Computer Technology. Here are scans of old datasheets about the Stride 460: http://www.sageandstride.org/html/stride_460.html Regards, david. http://www.sageandstride.org

18 years, 4 months

The 2N2/256-BSCP [was: Homebrew Drum Computer]

by ajp166＠bellatlantic.net

> >Subject: Re: The 2N2/256-BSCP [was: Homebrew Drum Computer] > From: ard at p850ug1.demon.co.uk (Tony Duell) > Date: Fri, 21 Dec 2007 23:26:06 +0000 (GMT) > To: cctalk at classiccmp.org > >> > Do all transsitors have to be of the same flavour, or could I use TUNs >> > and TUPs? >> >> I'd never encountered the TUN & TUP TLAs before, so I looked them up: >> Transistor, Universal NPN/PNP. Neat! > >I suspect the acronyms were invented by Elektor magazine over 30 eyars >ago. Although they're not still sued in said magazine, theu're handy :-) > >There's also DUG and DUS (Diode, Universal, Germanium/Silcon). > > >> >> And any TUN or TUP will do, provided a device of comparable spec was >> reasonably available to hobbyists in the mid sixties. For my first >> efforts, at least, I'll be using the PN2222 in modern TO-92 plastic Old TUNs and TUPs are in the 2n400 and 2n130x series of germainum computer transistors. Next generation was the silicon 2n70x series and their plastic cased counterparts. PN2222 is a fair devices to use for that. Far better than early 60s devices and being silicon far more stable too. Those should be easy to find for under 4cents at the 100 peice level. >Sure. I tened to use 2N3904/2N3906 to excess round here. I don't think >they're quite the same spec as a TUN.TUP, but they're pretty universal in >their own right :-). Good for both switching and RF too. Also the metal can TO18 parts the 2n2222A and 2n2905 when you need a higher Ic and of course the 2n2219 and 2n2907 in TO5 for the next power level up. All been around a long time and dirt cheap. > >> packages. I'm not sure when the TO-92 package was introduced, but >> there were definitely plastic package transistors available then. >> SOTs are right out, though :) The TI silicon TIS9x transistor series was popular. >Given that there's a limit on the number of transistors, I don't see what >advantage using SOT23s would give you. OK, you could make it smaller, >maybe clock it faster. But the change in package wouldn't allow a totally >different architecture. So I don't see any particular reason to ban them, >since the same design could be built with compoents in 1960's packages. The 2n3904/6 is about 10X or more faster than the 1960s germainium parts and still better than late 60s parts. Most of the 1960s wer the MADT germainium in it's odd metal (to39?) can or TO5 sized parts so most devices like TO18 or TO92 will be smaller. Allison >-tony

18 years, 4 months

More bits for free [UK]

by classiccmp＠memory-alpha.org.uk

Also just turned up the following: Philips CDD-462 External CD-ROM drive - boxed with manuals, software, 2 interface cards but no cable. Odd stand alone NCR tape drive unit (appears to use ordinary compact cassettes) - from an NCR machine I got shot of LONG ago. At least one "Telexbox" (a "Telexbox III" according to the manual). I'm really not interested in posting any of these items, so pickup from Birmingham please. TTFN - Pete.

18 years, 4 months

Stride 460 restoration video posted to YouTube

by daviderhart＠oldzonian.com

>On 21/12/2007, David W. Erhart <daviderhart at oldzonian.com> wrote: >> I've been having some fun with a Stride 460 tower I'm restoring. Here is a >link to the video I made of the Stride 460 restoration. >> >> http://www.youtube.com/watch?v=eOx-ZadCGDg >> >> The Stride 460 is a 68000 based system from Stride Micro in the mid 1980's. >Stride Micro was formerly Sage Computer Technology. >> >> Here are scans of old datasheets about the Stride 460: >> http://www.sageandstride.org/html/stride_460.html > >Nifty little film. Thanks for that! I particularly enjoyed the music, too. > >I'd have liked perhaps a little more actual video in the video, rather >than the endless pans and zooms, and perhaps a voiceover explaining a >little something about the machine - but I'm not saying it wasn't >good! > This was my first attempt at a YouTube video of a vintage system. I agree it could be much more informative. Good feedback for my next attempt. Glad you enjoyed it. I wish the quality of the YouTube video was as good as what I uploaded. david. >-- >Liam Proven ? Profile: http://www.linkedin.com/in/liamproven >Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com >Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419 >AOL/AIM/iChat: liamproven at aol.com ? MSN/Messenger: lproven at hotmail.com >Yahoo: liamproven at yahoo.co.uk ? Skype: liamproven ? ICQ: 73187508 >

18 years, 4 months

Booting Sage Computer talk at VCF 10.0 posted to YouTube

by daviderhart＠oldzonian.com

I finally got the video of Rod Coleman's (Sage Computer co-founder) talk at the Vintage Computer Festival edited and posted to YouTube. It's about 55+ minutes long so I had to brake it into six parts. They are at: http://www.youtube.com/user/daviderhart I learned a lot about making/editing a video for YouTube along the way. The next should be much better. :) Regards, david. http://www.sageandstride.org

18 years, 4 months

CDC 9425's on govliquidation.com

by tiggerlasv＠aim.com

I was perusing govliquidation.com, and noticed that they have Quantity 3 Control Data 9425 drives coming up for bids. Go to govliquidation.com, and do a search for 9425 As info. . . ________________________________________________________________________ More new features than ever. Check out the new AIM(R) Mail ! - http://webmail.aim.com

18 years, 4 months

The 2N2/256-BSCP [was: Homebrew Drum Computer]

by cclist＠sydex.com

From: dkelvey at hotmail.com > Another negative resistance device is the DIAC. These are > really cheap but these are knee type curves instead of > S type, like the TD and Lambda. > One would have to rearrange these in a parallel configuration > for a latch or flop, similar to the neon circuits. > The TD has the advantage that the stable state is lower > current, not higher current. > The disadvantage is that that tends to increate the impedance > of the storage net making it less stable and more susceptible > to noise. That is why I recommend the shunt resistor to > decrease the impedance. I did suggest DIACs along with the tunnel diodes as being a period device, but I think of them more akin to neon bulbs (i.e. great for relaxation oscillators and ring counters perhaps) than TDs. At the time of their debut, I believe that TDs offered the fastest performance of any semiconductor active logic. DIACs (I'm thinking of UJT speeds) would not nearly be as promising, it seems to me. There are patents employing Gunn diodes in logic, but a pair seems to be required. On the other hand, its relative, the IMPATT diode seems not have seen use as the active element in logic circuits. IMPATTs date from about 1965, so they're *barely* OT for the rules of the project. Cheers, Chuck

18 years, 4 months

FT: HP Omnibook 600C

by joachim.thiemann＠gmail.com

Hello everyone, doing a little cleanout myself, and this falls into "not really getting to play with this properly" category. I've got an HP Omnibook 600C, it's got a 486 CPU, 8megs ram, and a 340M pcmica hard drive, and a 640x480 screen. Works ok, except it'll reset after coming out of sleep mode - very annoying. Also, the left button of the pop-out mouse does not work, but is probably fixable. Original battery (Li-Ion?) still holds a charge, will give you tens of minutes of operation! Runs Dave's PC100 emulator quite well (80col only of course) you could use it as a nice small terminal! The hard drive has all the HP drivers (AFAICT) but no windows. I've only used it with DOS. I did use to run linux on this - years ago - but due to some proprietary hw (in particular the PCMICA stuff) I could only boot through DOS using "loadlin". Since linux can't access the PCMICA slots, it's of very limited use. I have no idea what it would cost to ship but would guess in the $20-$30 range for most of North America. I'm located in Montreal, Canada. It comes with the power adapter and the snazzy carrying bag! What I'm looking for in exchange: in particular, I'm looking for a HP48, especially if it has been opened already (and still works). I'm planning a little HW hack and would prefer not to do significant damage cosmetically to my 48S that is still in use and has sentimental value to boot - it got me through engineering school! But frankly, most hackable handheld/portable computing stuff (vintage or not) would be of interest to me :-) (anyone got a N770 lying around?) Joe.

18 years, 4 months

What ever happened to Hal Hardenbergh?

by aapstar99＠cox.net

My grandfather was col hal hardenbergh if you did info on him you can email he died last year and I have a lot of his letters. Amy Paez

18 years, 4 months

FREE: CDC CMD948

by drb＠msu.edu

Forwarding this note about the CDC 9448 for Billy Pettit. De ------- Forwarded Message I did tech support onthese drives for many years, working out of OK City.In fact, I'm still in touch with the original designer - had nunch with him about a month ago.It's a minor point, but one surface on the cartridge and one on the fixed pack is used for a servo reference. So it has two servo surfaces, the only drive I know with that piece of wierdness.Don't know if I still have a manual in the garage or not. Definately do still have the training aides,since I had to teach it to several OEM's support people. (There were more than 1000 configurations of the Phoenix sold to various OEMs at the time. I was on the road 50% of my time for a couple of years.)Can you forward this to the cctalk list? I can read it but not post messages. I'm pretty certain it is a problem with my ISP and not the list.Thanks,Billy ------- End of Forwarded Message

18 years, 4 months

Troubleshooting a TRS-80 disk drive

by chaosotter76＠gmail.com

I've just had one of the disk drives in my TRS-80 Model III start to go south on me, and before I crack the case and get down to serious diagnostic work, I thought I'd check with the list to see if the symptoms ring a bell with anybody. I believe that the drive in question is a stock factory install; it's the secondary drive in a fairly low serial-numbered Model III (in the 50,000s). The first sign of trouble was that the drive began returning spurious "Disk is Write-Protected" errors, which would go away upon reinserting the disk. Now it's begun episodes of returning TRS-DOS Error 08 ("Drive Not Ready") messages for all operations. The activity light functions normally, and the drive hasn't made any alarming sounds. It does not spin up the disk when it's in this state. After a while, it'll begin working again on its own. I realize there are any number of replacement drive solutions out there, but this is a system where I'd really like to keep the original equipment up and running until it just can't be patched together any longer. (I can't really explain why I'm so fond of this thing; I just am.) Thanks in advance for any suggestions, or just things to look at first. I've got a scope and logic analyzer I can use for diagnostics, but my knowledge of disk systems beyond the tracks-and-sectors level is marginal.

18 years, 4 months

Probably OT - eBay object - what the devil is it?

by tshoppa＠wmata.com

--- JP Hindin <jplist2007 at kiwigeek.com> wrote: > What on Earth is this? > > 110206772756 > > I'm guessing its OT because of the SMD devices in > the centre ring, but it > is weird enough I'm willing to risk Jay's wrath to > find out what it is. It looks a lot like the readout electronics that might go on the end of a high energy physics cylindrical wire chamber. Go to google images and look for "wire chamber". For even more science-fictiony particle physics detectors, google for "Gammasphere". I understand it made an appearance in the Hulk movie! Tim.

18 years, 4 months

Marginally On Topic Humor

by feldman.r＠comcast.net

>From the BOFH column in The Register (http://www.theregister.co.uk/2007/12/21/bofh_trivia_quiz_200712/): Are you an old bastard? 7. >Clunka Clunka Clunka< is the sound you would most associate with: A. The clothes dryer B. A washing machine with an imbalanced load C. A flat tyre on your car D. A tape safe door shutting repeatedly on an annoying user's foot E. An imbalanced DEC RM05 Disk assembly moving around the computer room by itself during a head crash

18 years, 4 months

The 2N2/256-BSCP [was: Homebrew Drum Computer]

by mike＠brickfieldspark.org

> From: Brent Hilpert <hilpert at cs.ubc.ca> > Subject: Re: The 2N2/256-BSCP [was: Homebrew Drum Computer] > > Another approach to discrete flip-flops can be seen at: > > http://www.cs.ubc.ca/~hilpert/eec/misc/CasioAL1000Tech/electronics.html > > The stacking of multiple inputs into the basic FF structure was another > technique from the discrete days. Helps reduce the amount of gating (and > hence > transistors) required, for instance when making a parallel loaded shift > register or counter, although they were lots of other novel uses. (Some > aspects of logic design were narrowed with the introduction of ICs for the > sake > of standardizing on elements that would fit in packages with limited > connections.) > Very similar to an East German calculator that I am partway through reverse engineering, a Soemtron 220. www.soemtron.org/downloads/board10.pdf http://www.cs.ubc.ca/~hilpert/eec/misc/CasioAL1000Tech/electronics.html Looks like thees pages might help in that task thanks for the link Mike.

18 years, 4 months

The 2N2/256-BSCP [was: Homebrew Drum Computer]

by dkelvey＠hotmail.com

> From: dkelvey at hotmail.com > To: cctalk at classiccmp.org > Date: Fri, 21 Dec 2007 08:21:53 -0800 > Subject: RE: The 2N2/256-BSCP [was: Homebrew Drum Computer] > > > > > >> From: mcguire at neurotica.com >> Date: Fri, 21 Dec 2007 08:52:06 -0500 >> To: cctech at classiccmp.org >> CC: >> Subject: Re: The 2N2/256-BSCP [was: Homebrew Drum Computer] >> >> On Dec 21, 2007, at 2:07 AM, dwight elvey wrote: >>> As a cheaper alternative to a tunnel diode, do a search for >>> a Lambda Diode. I used one of these circuits once to make an >>> oscillator that ran at over 100MHz. >> >> Oh my, there IS an almost-equivalent-to-a-tunnel-diode circuit! >> That looks really, really neat...I will have to play with that! >> > > > Hi > To better approximate a tunnel diode, you'd have > to put a resistor in parallel. I don't recommend doing > this as it only degrades the negative resistance. > Still, if one was to use a pair of these for a flop, it > might be more stable since at the higher voltages, > unlike a real TD, it completely shuts off. Without the > shunt resistors to bypass some current the circuit > might oscillate. > Dwight > Hi Another negative resistance device is the DIAC. These are really cheap but these are knee type curves instead of S type, like the TD and Lambda. One would have to rearrange these in a parallel configuration for a latch or flop, similar to the neon circuits. The TD has the advantage that the stable state is lower current, not higher current. The disadvantage is that that tends to increate the impedance of the storage net making it less stable and more susceptible to noise. That is why I recommend the shunt resistor to decrease the impedance. Dwight _________________________________________________________________ Share life as it happens with the new Windows Live. http://www.windowslive.com/share.html?ocid=TXT_TAGHM_Wave2_sharelife_122007

18 years, 4 months

ebay 110206772756 (what the devil is it?)

by aek＠bitsavers.org

DUT (Device Under Test) board for an automatic board tester. The pins around the edge are called pogo pins and mate with the base of the tester. You see these a lot on eBay, sellers never have a clue what they are.

18 years, 4 months

(REPOST) Stuff for trade, some possibly/likely free

by compoobah＠valleyimplants.com

Repost since the mail server doesn't seem to like to work outside of business hours I've been looking at the garage, and here's a list (for those who are waiting (you know who you are), I have the SIMMS and the Xyplex ready to go, the post office is a bit of a nightmare now though). (1) the definitely on-topic stuff Sun-3 and Sun-4 VME stuff. (note-Pat gets first call, since he's sending me some E3k stuff) 4x 501-1333 32M Sun 4/400 (/470, /490) ECC RAM (128MB total) 3x 501-1102 8MB Sun-3/200 ECC RAM (also works on 4/260 & 4/280 per FEH) 501-1167 Sun-2 SCSI and 9U->6U adaptor (external DD-50 conn.) 501-1276 FDDI adaptor 501-1539 IPI-2 adaptor 501-1206 Sun 3200 CPU, no PROM onboard. 501-1316 Sun 4300 CPU for parts 501-1203 Asynch serial multiplexor Sun 50-pin drive lunchbox. Assorted stuff (well, the Xylogics can go in a Sun) Xylogics 450 Multibus SMD controller, with or without a Sun VTM adaptor. DIGITAL Alpha Multia VX42 (233MHz, cache) with new battery. SGI IRIS Indigo Express (GR2 XS/XS-24/XZ/Elan) boards: ZB4 Z-Buffer 3x VM2 bitplanes Personal IRIS PSU and TFLU skins (no cracks, door in place) Xyplex Maxserver 4000-series terminal server, telco style outputs, fully populated. still many 4MB 30-pin (9-bit) parity SIMMS (80nS) (free) one Sun USIIi 333MHz/2MB Ecache module (U5/U10) Apple M0130 400K Macintosh floppy DD-50 interface drive box w/ PSU. The "pushing it" section: Unholtz-Dickie OSC-1S sweep sine generator Graphtec WR3200 thermal arraycorder (8-channel chart recorder) HP 3746A selective level measuring set HP 5061A Cesium beam frequency standard (CS beam likely needs work) HP scope frame that I've not tested yet - no plugins, email if interested as I'll test it later. Part of a satellite tracking system. Figure no interest, but I should ask before scrapping. Scientific Atlanta. On a more practical note, these have 3U rack cabinets, aluminum, pretty nice. Not set up for computer stuff specifically, but hackable. Renton, WA. If anyone wants to trade, I'm looking for a decent soldering setup, PROM/PLD programmer (need not be fancy), interesting computer stuff (perhaps some SGI Origin 200 dual processor modules, largish 72-pin parity SIMMS, even very off-topic but a couple of years old stuff that could run W*****s (but won't). Don't think any of this runs up anywhere near the value of a smallish PDP-11 or HP 2100, but figured I'd put it out as a pipe dream), or other electronic/computer stuff. Cash always accepted, too. Otherwise make offer, some I might just give away.

18 years, 4 months

Fw: Epson PC286UX ....anyone?

by brettdurham＠mybluelight.com

---------- Forwarded Message ---------- Does anyone have a source for the keyboard for this PC? This keyboard connects to an eight pin mini-DIN socket. Also if anyone has pin-out information for this keyboard or this PC's monitor outputs, (B/W-5 pin DIN connector, analog RGB-DB15 connector, or digital RGB), it would be greatly appreciated. I am also looking for pin out information for my Zenith ZVM-131 monitor purchased new in 1985 but did not have a manual with it when we received it. Regards, Brett _____________________________________________________________ Need cash? Click here for low rate home equity options. http://thirdpartyoffers.mybluelight.com/TGL2321/fc/Ioyw6i50uhFS2ETSxvvPdN8f…

18 years, 4 months

next out the door (parts available)

by jwest＠classiccmp.org

Tall Corporate cab, plus five (all bad hda) RA81 drives. The corporate cab includes an 861A power supply. This 861 has a power cable half the size of my arm coming out of it. The cab was sold with four RA81's in it, so it has all the correct DEC rack hardware & cable management pieces for all the SDI cables (several of the bolt on SDI in/out modules), the power sequencing connectors for in/out of the rack at the bottom, etc. It also has a metric buttload of SDI cables and power sequencing cables. All headed for the skip unless someone is willing to pay shipping for any of it. It will be gone within 24 hours. I don't want to ship dead drives or anything, but I'm willing to unbolt any small rackmount hardware or brackets people may want. Jay

18 years, 4 months

The 2N2/256-BSCP [was: Homebrew Drum Computer]

by bnansel＠bigpond.net.au

On Thu Dec 20, 2007 at 17:01 Dave McGuire wrote: > > Well, if you put no limit on the number of diodes (just 3 terminal > > devices), you can go a heckuva long way using tunnel diodes or even > > diacs. > > I'd love to find a huge stash of a few thousand new-old-stock > tunnel > diodes. :-( > > -Dave Me, too! I've never seen tunnel diodes going for less than $50 each, so if I had a few thousand I'd sell most of 'em for $40 : ) -Bobby

18 years, 4 months

Exatron Stringy Floppies

by billdeg＠degnanco.com

> > >Well, I have the Exatron Stingy Floppy adverts on the back of (and >inside?) several issues of 80 Microcomputing which I could attempt to >photograph with my (cheap) webcam, if anyone is interested? > >No newsletters though :( > I have some of these materials if anyone is interested in PDF scans. Contact me directly and specify which issue of 80 Microcomputing and/or Newsletter (I have only the first @LOAD, the newsletter's name). I am presently working on a new drive belt replacement. I have found a vendor to make the belts and hope to get them in early January. It seems that every stringy floppy that I have come upon has a dried-up drive belt, making the drives useless. Before my last belt died, I was able to take a few pictures of a successful load: http://www.vintagecomputer.net/tandy/trs80_1/exatron_stringy_floppy/ Bill

18 years, 4 months

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