I'd love this just for the url. But it's better than that. Edible circuits!
Combining two of my best things.
http://www.evilmadscientist.com/article.php/circuitsnacks
-----
454. [Humor] I played a blank tape on full volume. The mime who lived next
door
complained. So I shot him with a gun with a silencer. --Steven Wright
--... ...-- -.. . -. ----. --.- --.- -...
tpeters at nospam.mixcom.com (remove "nospam") N9QQB (amateur radio)
"HEY YOU" (loud shouting) WEB: http://www.mixweb.com/tpeters
43? 7' 17.2" N by 88? 6' 28.9" W, Elevation 815', Grid Square EN53wc
WAN/LAN/Telcom Analyst, Tech Writer, MCP, CCNA, Registered Linux User 385531
OR,
It IS possible, looking at the release statement (inserted below) in the .pdf, that scribdb and Andrew Lynch and Bill Bradford may have an interest in where the book is hosted.
Dunno.
Vern Wright
"A Note about this book and its free availability online
Readers are encouraged to download this book of design guidelines and application notes from Steve
Ciarcia, founder and editorial director of Circuit Cellar magazine. Although the original title first
appeared in 1981, pre-dating Circuit Cellar ?the magazine,? I still get a number of purchase requests
each year from electronics enthusiasts. Some are just interested in Steve?s brand of designing and ability
to overcome obstacles, while others still find themselves tweaking projects that use parts described in
Steve?s projects.
Please note: The original work was only available as a hard copy. Thanks to Andrew Lynch and Bill
Bradford for their work in creating the PDF and getting permission from copyright holder Steve Ciarcia
to release it. Scanning done by Bill Bradford.
You will be pleased to know that the same style of embedded computing articles can be found each
month through Circuit Cellar magazine. Please visit www.circuitcellar.com to learn about this monthly
resource for professional designers and electronics enthusiasts alike.
Please enjoy ?Build Your Own Z80 Computer? as a great blast from the past. Its style is the foundation
on which Circuit Cellar magazine was built and continues to grow. I look forward to seeing you become a
part of the ongoing Circuit Cellar success story.
Sincerely,
Sean Donnelly, Publisher ? Circuit Cellar
circuitcellar at circuitcellar.com"
First thing, this is not my machine, but someone i know who asked me
to post this.
--
Tilburg University in the Netherlands wants to get rid of an Origin 2000 sgi
2400. It consists of 3 cabinets of about 2 meters high; width about 22 inch.
Out of the 4 panels present, 3 are still fully functional. Is has 48 GB RAM
and 24 CPU's running at 200 MHz. It's free for anybody willing to arrange
transportation. Please reply to joostvb+sgi at uvt.nl if you're interested. If
you plan to use the machine for Free Software work, you'll get a priority
handling :)
Here's a picture of what these things look like:
http://db313.ath.cx/~sp/auctions/SGI-O2000_main_large.jpg
And here's a description of such a machine:
http://cgi.ebay.com/Silicon-Graphics-SGI-Origin-2000-Full-Rack-Server-Runs!…
3 racks, each of them is _probably_ :
Width Height Depth Weight
71 cm 185 cm 102 cm 317 kg
(28 inches) (73 inches) (40 inches) (700 lb)
The racks have once been lifted by 6 strong man.
--Joost van Baal,
2009-04-28
---------------
I think it allmost falls within the 10 year rule ;-) (origin's started
shipping in what, 97?)
on Tue Apr 28 13:36:34 CDT 2009 silvercreekvalley wrote:
...
> server - ie something around 400MHz clock speed. Anyone
> have anything available in the UK that they would like
> to get rid of? Its for testing performance on low
> end systems.
Wow ... 400MHz ... I'm not sure any of my classic computers are that
fast. I have lots of 75-80MHz ones and a few 750KHz ones, but sorry
nothing above 100MHz
:-)
I could do with an older PC compatible rack mountable
server - ie something around 400MHz clock speed. Anyone
have anything available in the UK that they would like
to get rid of? Its for testing performance on low
end systems.
Ian.
>
>Subject: Re: Ciarcia's Circuit Cellar
> From: Ethan Dicks <ethan.dicks at gmail.com>
> Date: Sun, 26 Apr 2009 11:07:38 -0400
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>On Sat, Apr 25, 2009 at 4:44 PM, Allison <ajp166 at bellatlantic.net> wrote:
>>>Hi! ?Steve and Sean generously released BYOZ80C to allow online publishing.
>>>I very much enjoyed his book and commend him for both writing it in the
>>>first place and also releasing it so as to help keep the home brew computing
>>>tradition alive.
>>>
>>>http://www.scribd.com/doc/13388965/Build-Your-Own-Z80-Computer
>>
>> Also a most useless site. ?Despite all claims of down loadable document
>> it plain doesnt do it.
>
>I had no problem with a Mac and Firefox getting a PDF to download.
I went to the mac using safari and that worked. Firfox on the NT4 box,
Ubuntu8.04 and even Ubuntu 9.04 however clicking the down load button
was a do nothing from Firefox.
>> Sites like this have a habit of disappearing and
>> taking the content with it. Far too much stuff has gone lost over the
>> years.
>
>Too true.
I have a massive abount of stuff I've downloaded form locations like that
(also oak.oakland, Simtel and ..) and when I send people to the location
it's not there anymore so it's fortunate I have the downloaded image.
The nastiest things is a the cases where Geocities was consumed and material
lost and later AOL hometown. the best example si try to find P2DOS, used to
be on simtel and Oakland to name a few now mostly dead links or not at all.
Allison
Hi,
My Zilog S8000 Winchester Controller board carries 2 ceramic DIL16
packaged chips labeled (beside a logo) just with the two lines of text.
The chip looks like this (tried to ASCII-art the logo in front of the
text)
+----------------------------------------+
| +-------+ |
| |----- | |
\ | > ----| 6306-1J |
/ |----- | 8147 |
| | > ----| |
| +-------+ |
+----------------------------------------+
I guess the 2nd line means:
81 == 1981
47 == calendar week 47
So I wonder what 6306-1J stands for? I've not analyzed the circuit to see
if it is a PROM or something like that. It is put in a socket so I guess
it must be something (onetime?) programmable...
Maybe you can tell...
--
Oliver Lehmann
http://www.pofo.de/http://wishlist.ans-netz.de/
On 4/26/2009, ard at p850ug1.demon.co.uk (Tony Duell) wrote:
>
>Message: 1
>Date: Sat, 25 Apr 2009 19:27:20 +0100 (BST)
>From: ard at p850ug1.demon.co.uk (Tony Duell)
>Subject: Re: Transistors...
>To: cctalk at classiccmp.org
>Message-ID: <m1Lxmay-000J3RC at p850ug1>
>Content-Type: text/plain
>
>> > If you wire two diodes in series (PN->NP), it isn't the same as a
>> > transistor (PNP), at all.
>>
>> It is. A PNP is just the same thing as a PN-+-NP.
>
>In one sense it is, but I can assure you that if you connect 2 diodes
>together in this way (no matter what sort of diodes you use), you will
>not get a transistor. The resulting circuit will not show any current gain.
>
>IIRC, what you need is a sufficiently thin base region (the 'N' in the
>example you gave) that electron-hole recombination does not occur. You
>can't join 2 n-type pieces with a bit of wire and get this.
>
>> possible space wise anyway, not even considering characteristics. But
>> that don't change the fact that you get a working transistor with just
>> two diodes.
>
Excuse the bluntness, but that is utter and complete bollocks. You do
*not* get a transistor with two diodes. Tony's comment above is
correct, for a transistor to work, the base needs to be thin enough that
electron-hole recombination does not occur (to any significant degree at
least).
Two diodes connected back to back will never be anything but two diodes
connected back to back. No current gain *at all*.
>I am not convinces. If you have got this to work, can you please tell me
>what sort of diodes you used, and I will try to recreate it (if I see it
>working on my bench, I'll be convinced!)
>
>-tony
>
/Jonas
Hi! I recently obtained a "mystery" IBM PC board. It has a Z80 CPU, two
CTCs, 8K of SRAM, and a bunch of 74LS logic. I *suspect* this board is one
of those VCR backup boards from the early 1980's.
The only text on the board is described by its previous owner on
Vintage-Computer.com forums:
QUOTE
i don't think the EGA cards used a Z80bCPU chip or a 12mhz crystal...
i did find some numbers on the card...
Audio Visual Laboratories, Inc.
27122 R0I
M14A 94V0
Serial Number 1518
i know i looks like an EGA card, but it doesn't even try to initialize a
monitor on the rca jacks or the 9-pin port...
UNQUOTE
The ROM (AM27S29PC, 512x8 bipolar PROM) has a label that says "GENESIS
7-11-84"
I did some research on Audio Visual Laboratories and apparently they are
related to the old Eagle computer people. According to Wikipedia, Eagle had
a relationship with Corvus for hard drives and backup so I am thinking this
board *may* be a Corvus XT Mirror board relabeled by AVL. That is a guess
though.
http://n8vem-sbc.pbwiki.com/browse/#view=ViewFolder
<http://n8vem-sbc.pbwiki.com/browse/#view=ViewFolder¶m=AVL> ¶m=AVL
Does anyone recognize this board? Does anyone have software and/or
documentation for the Corvus IBM XT Mirror? I already checked bitsavers.org
and Howard's archive. They mention the existence of an "IBM XT Mirror"
board but almost no other information on it.
Any help is much appreciated. Thanks in advance. Have a nice day!
Andrew Lynch
I have been gathering information on how to clean and properly lubricate
a DEC PC05 and an ASR 33. The teletype manual calls out KS-7470 oil and
KS-7471 grease. Googling, I find that there are a great number of
lubricants with KS numbers. What is the origin of this number? It seems
like it is some kind of directory of lubricants, but I can't find a
listing. I found a cross for KS-7471 in an old AT&T purchasing document,
but none for KS-7470.
-chuck
