>
>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
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.
>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
>
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
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. . .
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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
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.
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
