>From: "Eric Smith" <eric(a)brouhaha.com>
>
>Doug Jackson wrote:
>> A UV LED?????
>[...]
>> I was aware that we have White, and blue (Through Phospor, and funky
>> doping), but these UV devices are new to me...
>
>Blue LEDs don't require any phosphor. The phosphors are used to get
>*other* colors from blue or UV LEDs, such as white. Agilent made some
>really nice white LEDs that didn't have the remaining blue tint of
>the common ones, but they were expensive and no one wanted to pay
>the premium, so they've been discontinued.
>
>The earliest blue LEDs (Silicon Carbide) had very low output, so RGB LEDs
>needed two blue dice to one each red and green to get decent matching.
>However, so much R&D has been done to improve them that now blue LEDs
>(gallium nitride) are now the *most* efficient, at least in the visible
>spectrum.
>
Hi
That doesn't explain short wave UV LED's. If you had
enough energy to erase an EPROM, it would be strong
enough to damage the cornea of your eye. I've experimented
with long wave UV when I was at Intel ( years ago ).
Even a week under one of these had no effect.
Dwight
Sounds great. Let me know what you find out!
Thanks,
John "VAX Pirate" Willis
-----Original Message-----
From: Kelly Leavitt
Sent: Wed 1/22/2003 4:03 PM
To: 'cctalk(a)classiccmp.org'
Cc:
Subject: RE: Quasijarus 4.3BSD on 1600bpi magtape
Depending on where you would need it shipped, I'd try making one
for you. I
couldn't find the FTP site, but if given the file specifics,
I've got a T1
available for the download too.
MS: Where can I find the instructions and content? I'll read
them over and
see if my tape drive will do what is needed. It is pretty
versitile. I use
it to read and convert tapes from all kinds of systems.
Kelly
-----Original Message-----
From: msokolov(a)ivan.harhan.org [mailto:msokolov@ivan.harhan.org]
Sent: Wednesday, January 22, 2003 1:41 AM
To: cctalk(a)classiccmp.org
Subject: Re: Quasijarus 4.3BSD on 1600bpi magtape
jwillis(a)dahmer.vistech.net wrote:
> Does anyone know of a source for Quasijarus 4.3BSD on 1600bpi
magtape?
(TU80)
Anyone with a 9-track tape unit (I'm sure there are plenty such
people on
this
list) should be able to write you a set of tapes from the images
on my FTP
site. There is even a FORMAT.1600 file there telling you what to
put on
which
tape and in which order.
A friend of mine is holding a working TU81 for me and while I
would love to
get
it operational, I don't feel like bringing it into this
apartment,
especially
since I may have to move again in 6 months...
MS
> Anyone know where I can source the resistive touchpad element for an
> Apple Messagepad 2x00 from?
>
Try posting your inquiry on the MacMarines list; send it to
<sarge(a)macmarines.com>, a great resource for all things Apple.
..SML
A UV LED?????
(Drops his project planning tools, and kind of wishes he was at the
technical coal face once more)
I was aware that we have White, and blue (Through Phospor, and funky
doping), but these UV devices are new to me...
regards
Doug Jackson
Director, Managed Security Services
Citadel Securix
+61 (0)2 6290 9011 (Ph)
+61 (0)2 6262 6152 (Fax)
+61 (0)414 986 878 (Mobile)
Web: <www.citadel.com.au>
Offices in Melbourne, Sydney, Canberra, Hong Kong, Boston
-----Original Message-----
From: Bob Shannon [mailto:bshannon@tiac.net]
Sent: Thursday, January 23, 2003 10:58 AM
To: cctalk(a)classiccmp.org
Subject: Re: A way to erase OTP components?
I currently work for a company that makes the X-Ray supplies
for airport
scanners. We have the full X-Ray
emitter heads at test loads for the -180KV, 15ma supplies in-house.
These scanners place the high voltage under computer control,
they don't
run at any one preset level. I gather
that the operating point shifts as the tubes age, and perhaps also with
the material being examined under software
control.
But crank one of these babies up to full power, and the X-rays will
generate very high charge levels in the die and
cook the part.
The question now becomes, does the date go away before the
transistors do?
On a related note, I recently erased a (windowed) 27C512 using
a UV led.
I did'nt think it would work, but it did.
Eric Smith wrote:
>Bob Shannon wrote:
>
>>X-rays will erase the part at high energy levels, but this will also
>>degrade the part to the point where it
>>will fail soon, or die during erasure.
>>
>
>A friend had a large quantity of programmed 27C512 OTP EPROMs, with
>contents of no use to him. He tried to erase them using a commerical
>X-ray machine, of the type used for inspecting assembled circuit boards
>(to check solder joints on BGA packages) and was unable to produce any
>noticable change to the part.
>
>This subject has been discussed on sci.electronics multiple
times in the
>past, and the consensus was that the frequency of Xrays is such that
>they have no direct effect on the stored data. But at very high
>exposures it is definitely possible to damage the part.
>
>Note that the exposure levels used for baggage inspection at airports
>is far too low to cause any measurable effect on EPROMs. They are
>generally set to substantially lower levels than medical X-rays
>equipment.
>
>The normal erasure procedure for EPROMs is to use short-wave UV light,
>nominally at a wavelength of 2537 angstroms (about 254 nm). Unlike the
>more common long-wave UV (black lights), this *is* dangerous
to your eyes;
>never look into the light. The light bulbs and the window on the EPROM
>are made from quartz rather than glass, because glass blocks
most of the
>short-wave UV. Suitable bulbs are commonly sold for germicidal use.
>
>In the mid-1980s, at least one Japanese semiconductor company offered
>plastic windowed EPROMs. The package was a normal epoxy DIP package,
>except that a square area in the center was molded from a different
>plastic. The window was translucent (not transparent) to
visible light.
>These were less expensive than the usual ceramic windowed parts, but
>more expensive than OTP parts. However, they could only be erased a
>small number of times because the plastic window becomes opaque to the
>shortwave UV with prolonged exposure.
>
>I'd heard of these plastic windowed packages at the time, but never
>actually saw one until I purchased a coin-op video game board at an
>auction.
>
>Eric
>
>
>
>
>
CAUTION - The information in this message may be of a privileged or confidential nature intended only for the use of the addressee or someone authorised to receive the addressee's e-mail. If you are not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this e-mail is strictly prohibited. If you have received this email in error please notify postmaster(a)citadel.com.au. Any views expressed in this message are those of the individual
sender and may not necessarily reflect the views of Citadel Securix.
Feel free to visit the Citadel Securix website! Click below.
http://www.citadel.com.au
Hi folks:
A couple of questions:
1) OK, this one is off-topic: Does anyone have an old laptop for sale?
I'm looking for a reasonably-priced one with Win98/98se.
2) I recently got a toshiba T1100plus which seems to work well (except for
a few stuck pixels). It came with an ms-dos 3.30 disk, which boots it
nicely, but I would like to find ms-dos ver 3.2 that it shipped with.
Also, when I run format on the machine (with 3.3), it formats the disks to
300-something KB instead of 720KB. Running format /? does not seem to list
help info on the 3.3 dos, as it does on other versions I have used. I can
format a 720K disk on my win98 desktop machine, but I am wondering why dos
3.3 is formatting to less that the drive can handle. Anyone with Toshiba
dos 3.2 out there?
thanks,
gil
;-----------------------------------------------------------
; vaux electronics, inc. 480-354-5556
; http://www.vauxelectronics.com (fax: 480-354-5558)
;-----------------------------------------------------------
Kelly Leavitt <kelly(a)catcorner.org> wrote:
> MS: Where can I find the instructions and content?
ivan.Harhan.ORG:/pub/UNIX/4.3BSD-Quasijarus0a
Since the original enquirer asked for 1600 BPI, you would go by FORMAT.1600.
All files on my site are compressed with 4.3BSD-Quasijarus compress(1). The
1600 BPI distribution consists of two tapes (assuming you are using 2400 ft
reels). The first tape contains binaries and the second tape contains sources.
The tape with binaries must be written uncompressed, and the sources can be
written compressed as they are on the FTP site to fit them on one tape. If the
machine you will use to write the tapes isn't running 4.3BSD-Quasijarus0a and
you don't have an uncompress utility that supports 4.3BSD-Quasijarus compress
-s format, you will need to download and compile my compress utility in order
to uncompress the binaries:
ivan.Harhan.ORG:/pub/UNIX/components/compress.tar
MS
Couple of questions about a Thunderware LightningScan for the Mac.
1: Any one have any idea what the voltage is for the power supply for it?
I have on here, but the person I got it from warned me that the power
supply he was including might or might not be for it. All he knew is it
was the only power supply in the box of stuff with it that fit. The power
supply is a wall wart rated at 16v AC, 20vA. Says its made by Condor.
2: Included (and what I actually thought I was getting) is a Thunderscan
adaptor for the Imagewriter. It has been a REALLY long time since I used
one, but I recalled it being a drop in replacement for the ribbon, and it
connected inline to the serial port. So you connected the Thunderscan to
the Mac, and the Imagewriter to the box on the cord for the Thunderscan.
The one I have jives with that, but connected to the end of the serial
connector is another box that looks like it would connect to the Drive
port, and then to a Mini-Din 8 serial port. This box is removable, so it
might not belong for all I know (it is labled "Thunderscan", so it must
at least go to one of their products) What is this other box. Is it just
a converter for use with din 8 serial ports? If so, why the connector for
the Drive port? (The one I used in the past was on a 512K, and I don't
remember this box being part of the setup, but then it would have
connected to a DE-9 serial port which is what the Scanner head cable
terminates to).
3: What is the LightningScan box for? Is this part of a different
scanner? I'm sure this box was not part of the setup I used in the past.
It appears to have SCSI ports on it (two DB-25 ports and a push button
number selector). There is a mini-din 8 on this box. Is that odd adaptor
to hook up to this box? The din 8 cable looks kind of short to be used
with this box and have it connect to the drive port AND the box connected
to the SCSI port. (The box is too small to be a zero footprint device
that sits under the Mac, and the din 8 pigtail is only about 5 inches
long, enough to reach to the serial port on the Mac, but not enough to
reach to the outside of the mac to connect to the front of the
LightningScan box where the din 8 port is).
I did a bit of googling, and it looks like the LightningScan box was for
a hand scanner, so it might not go to the Thunderscan at all. But that
other drive port looking adaptor box has me stumped.
Anyone able to shed some additional light on this stuff?
-chris
<http://www.mythtech.net>
Depending on where you would need it shipped, I'd try making one for you. I
couldn't find the FTP site, but if given the file specifics, I've got a T1
available for the download too.
MS: Where can I find the instructions and content? I'll read them over and
see if my tape drive will do what is needed. It is pretty versitile. I use
it to read and convert tapes from all kinds of systems.
Kelly
-----Original Message-----
From: msokolov(a)ivan.harhan.org [mailto:msokolov@ivan.harhan.org]
Sent: Wednesday, January 22, 2003 1:41 AM
To: cctalk(a)classiccmp.org
Subject: Re: Quasijarus 4.3BSD on 1600bpi magtape
jwillis(a)dahmer.vistech.net wrote:
> Does anyone know of a source for Quasijarus 4.3BSD on 1600bpi magtape?
(TU80)
Anyone with a 9-track tape unit (I'm sure there are plenty such people on
this
list) should be able to write you a set of tapes from the images on my FTP
site. There is even a FORMAT.1600 file there telling you what to put on
which
tape and in which order.
A friend of mine is holding a working TU81 for me and while I would love to
get
it operational, I don't feel like bringing it into this apartment,
especially
since I may have to move again in 6 months...
MS
Here in Australia,
STD calls (over 50km?) are billed per minute.
My understanding is that our entire population (approx 14 mill) is
equivalent to that of New York. Unfortunately (from an infrastructure
perspective) this population is spread over an area the size of the USA.
This means that telecoms costs are high.
This is not actually a problem for net connections here, as most national
ISP's provide a 'local call' number to dail.
Doug Jackson
Director, Managed Security Services
Citadel Securix
+61 (0)2 6290 9011 (Ph)
+61 (0)2 6262 6152 (Fax)
+61 (0)414 986 878 (Mobile)
Web: <www.citadel.com.au>
Offices in Melbourne, Sydney, Canberra, Hong Kong, Boston
> -----Original Message-----
> From: acme(a)ao.net [mailto:acme@ao.net]
> Sent: Thursday, January 23, 2003 8:03 AM
> To: cctalk(a)classiccmp.org
> Subject: Re: Re: A plea to classiccmpers
>
>
> From: Daniel Hicks <danielrhicks(a)hotmail.com>
> Date: 01/22/2003 1:37 PM
>
> >
> > Pay by the minute for connection time? You're getting screwed.
> >
>
> I beg your pardon. I live in the USA. However, in many
> parts of the world,
> all telephone calls are metered.
>
> This is *not* a USA-only list.
>
> Later --
>
> Glen
> 0/0
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
CAUTION - The information in this message may be of a privileged or confidential nature intended only for the use of the addressee or someone authorised to receive the addressee's e-mail. If you are not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this e-mail is strictly prohibited. If you have received this email in error please notify postmaster(a)citadel.com.au. Any views expressed in this message are those of the individual
sender and may not necessarily reflect the views of Citadel Securix.
Feel free to visit the Citadel Securix website! Click below.
http://www.citadel.com.au
On Jan 22, 12:45, dave(a)cirt.net wrote:
> Quoting pete(a)dunnington.u-net.com:
> > On Jan 18, 16:16, Philip Pemberton wrote:
> >
> > > Finally, does anyone know how some discs were formatted so they
were
> > > compatible with 40-track and 80-track disc drives?
> > The way Acorn did that with things like the Master 128 Welcome Disc was
to
> > make all the directory entries (on track 0) point to tracks between 5
and
> > 9, and 20 and 39. Track 20 on a 48-tpi drive is where track 40 would
be on
> > a 96-tpi drive:
>
> One has to be very careful with the formatting - there where several
different
> FS formats - some with varying compatibility. (Talking about the file
system
> side here) The Master welcome disc used ADFS which was slightly more
advanced
> than the more common DFS that was used on the earlier Acorns.
Yes, I'm aware of that. The Master Welcome Disc appears to the system as
an ADFS S disc (S means "small format", 160K), ie as 40-track single-sided
disc. It just happens to be made in such a way as to be readable in
40-track and 80-track drives.
I created a few discs like that at the time. I did it by hand, but I
believe eventually someone made a utility or ROM to do it.
Now if you think that's wierd, how about the disc I have (also for a BBC)
that has three separate sets of data on it, all in DFS format?
--
Pete Peter Turnbull
Network Manager
University of York
