> There is no Application jou can just build out of a 555
Actually I recall a 70's hobbyist homebrew optical paper tape reader (in BYTE?) where the Schmitt Trigger for each photodiode was nothing but a 555, NOT BEING USED AS A TIMER, just as a Schmitt Trigger. Unlike using real "schmitt trigger" parts the 555 had a built in resistor network that set trip points to 1/3 and 2/3 Vcc with no external parts.
I was really thrown for a loop when I saw the schematic. Nine 555's, no R's or C's. I was sure it was a typo or an April Fool's joke, but no, it was for real.
Similarly folks cleverly use PIC's (not sure Arduino can do the same but probably) choosing Schmitt trigger inputs and/or internal pull-ups. I'm sure someone could make a 1/3 and 2/3 Schmitt trigger using PIC's and some clever cross-wiring of analog and digital ports.
Tim.
Hi,
maybe someone from europe has interes in this and is willing to
drive to Frankfurt to collect it. A fairly complete lokking
NOVA1200 system.
http://www.ebay.de/itm/160781530347
He wrote, that on request he is also able to provide another
NOVA 1200 processor and two additional disk drives series 30.
I wonder where the price will go...
Greetings.
I know most of you dont believe that I have anything, But the truth is
I do, I work in ewaste and im trying to move the excess apple stuff so
I can make more room for the incoming apple II stuff.
$10 dollar LC 575 machines, Some 550s, 1 or 2 580s and a 520- These
are Local Pickup in Person
8 G3 All in one Macs- AKA Molar Macs $20 dollars each- These are
Local Pickup in Person
Performa/Power Mac 5400/5500s $25 each.. All have AV System with still
boxed TV Tuner and remote- Local Pickup in person- too heavy and too
akward to ship
Apple //e's $20 dollars each
Monitor //s $20 dollars each
Apple IIGS Monitors $25 each
80mb 50 pin SCSI Drives $15 each shipped
Apple Extended Keyboard IIs $15 each
For those of you who dont believe me, heres some pics to prove it
http://www.flickr.com/photos/67970316 at N08/sets/72157629866466539/
All for pickup near flint michigan.
I find the dislike of the Arduino by some people in this forum a bit
silly, yet funny in a history-repeating way. The Arduino, in my
opinion, occupies roughly the same space that the Vic-20 (or ZX-81)
did back in its day. It's a great intro to the field.
Sure, the cool kids are building their own computers using S-100
cards, the rich kids are buying far more capable Apples and Tandys;
the pros use minis. And while most Vic-20 users never get beyond
playing copied versions of Lunar Lander, some of them get sufficiently
interested to go on to better things and delve deeper, hitting the
limitations and working around them. Remember - neither the VIC-20 or
ZX-81 came with any info on how to program them in anything other than
the (very limited) BASIC.
More importantly, the Arduino disrupted the microcontroller dev board
market in such a way that to get any mindshare these days you need to
have a sub-$100 board to get hobbyists interested, AND have a
(reasonable, and open or at least free) click-and-compile IDE with it.
Joe.
PS. I apologize for mixing technologies of different time frames in
the example above. That whole period was a bit of a blur to me.
Pedants, be pedantic, please :-)
--
Joachim Thiemann :: http://jthiem.bitbucket.org
Try contacting Steve Gibson (http://www.grc.com/intro.htm). He wrote some Zip/Jazz drive diagnostic software that addressed the "click of death" problem.
Maybe he can help you?
Al
>
>I haev no moral objections to SCSI at all (it's fully docuemtned, it's
>not over-complicated, there are standard ICs to talk to it, or you cna do
>it all in simple logic chips, etc). The problem is that very few of my
>machines have SCSI interfaces.
>
>Also, for a machien to be useful with a scanner, I would have thought it
>should have a high resolution graphics display. Of the machines I use,
>the PERQ probabl;y has the heighest pixel count (1280*1024),. but that;'s
>only 1 bit per pixel. The I2S units have a better colour resolution, but
>only 512*512 pixels. They conenct to a PDP11 (or will do when I get round
>to restorign them).
>
>Of course the problem is that there are not likely to be any drivers for
>a scanner on any of these machines. I realsie the scanenr commands are
>documented (at least for some scanners), but writign the drivers is not
>something I want to undertake....
>
I've got a SCSI scanner plugged in to a MicroVAX 4000. Using the open source
"sane" portable scanning package, suitably tweaked for VMS, I can scan quite
happily. It's not fast - I've never gotten around to looking into speeding it
up. My MV4000 doesn't happen to have graphics capability but the TIFF files
>from the scanner can be displayed using a clustered VAXstation 3100 which does
have graphics or displayed on a remote X-Windows server or transferred to
another machine for viewing.
Regards,
Peter Coghlan.
Hi guys,
Yesterday eavening I've checked my new TSZ07 9 Track Tape on my VS4000/90
the first time, it worked flawlessly. Later I've switched it of with the
power button on the fron paneel.
This morning the Drived stinked. A smell like an burned transformer.
I've pulled the powerchord and leaved to go to work.
Now I have dismounted the PSU and looked inside: Shit!
There are 2 board in there, the one with the big Heatsink in the middle has
on one edge an uncooled TO220 Transistor (or something looking like one)
and a wirewound resistor near by. The entire area around them is burned
black. Noch chance to read Parts values or so. The PCB is bad also, burned
to carbon. Interestingly this PSU (and the entire Drive) is still
working... no fuse blown or something. :-|
Guys I need urgently an schematic of that PSU to replace this part of the
PCB. It isn't the first time that I'm repairing switchmode PSUs even w/o
any schematic, but this one really looks bad.
The drive is a TSZ07 DEC Drive, I think it is the same as the Cipher M995S,
or the otherway around it is a relabeled cipher drive.
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
... another classic service dies... first Gopher (Archie, etc) now
Ceefax (teletext)!
http://en.wikipedia.org/wiki/Ceefax
--
Yoyodyne Propulsion Systems: ?"The Future Begins Tomorrow"
Visit us at: http://www.yoyodyne-propulsion.net
--------
"Under the Obama plan, NASA will spend $100 billion on human
spaceflight over the next 10 years in order to accomplish nothing"
-Robert Zubrin
From: Jos Dreesen <jdr_use at bluewin.ch>
Subject: Iomega ZIP programming manual ?
> Probably borderline for CCtalk,
> but does anyone have a proper programming manual for the
> Iomega ZIP drive ( 100MB atapi version ) ?
> I need to know exactly which ATAPI commands have been implemented.
To paraphrase a famous Jedi knight "use the source, Luke!"
The Linux driver source code
is probably the closest thing to documentation
This mentions what parts to look for:
http://www.faqs.org/docs/Linux-mini/ZIP-Drive.html
(sorry I don't have a better URL.
I've rarely needed to find Linux source code)
I never allowed ZIP drives in my house
but I tried using 1 gig JAZ drives.
I ruined them by trying the SCSI low-level format command on them.
The cartridge was unuseable after that.
I suspect ZIP drives & cartridges are similar:
DO NOT LOW LEVEL FORMAT!
-- jeffj
Its in NE Philadelphia. You must come deinstall and haul away. Time
is very short. If you are interested and can come and remove very soon
email me and I will give you the contact information. I have no more
knowledge, just forwarding the info. It's unclear if they will want
some $ for it.
