Hmm, a quick Hotbot search reveals a $250K real estate transaction
in Aspen, CO to a Perry Pollock, and that name is listed as the
"Foreign Shipping Coordinator" for an overpriced herb/vitamin scam at
<http://www.putpeel.com/healthy/>. Think the couple in that
picture are the same ones in the 1979 Byte picture at
<http://www.brouhaha.com/~eric/retrocomputing/wps/byte197904-068.gif>?
Hard to tell. :-)
- John
Yes, there are/were many different formats for recording digital
data on audio cassettes. Some used frequency, some used phase
info, and some recorded to the tape using something other than
conventional voice-style recording. Think of them as modems
at speeds of 120 to 2400 baud.
I've found a number of decoders that were developed for the
emulator scene. Most are quite crude and unforgiving.
I concluded that I wanted to store absolutely uncompressed
digitized audio until I confirmed that any of today's various
compression methods wouldn't obliterate the encoded data.
Given the dozens of encoders and compression schemes out there,
how do you know if a particular scheme won't wipe out the
data by simplifying waveforms, fudging phase relationships, etc.?
Storage is cheap. You don't need stereo. If the waveforms use
audio in the range 1200 to 2400 Hz, for example, then Nyquist
tells you to oversample by 2 to 8 times, meaning even 8 Khz,
8-bit might be overkill with roughly 8 K/sec storage,
and 22 Khz sampling is certainly adequate.
As someone pointed out earlier in the thread, being able to tweak
the azimuth on the tape head makes all the difference with some tapes.
- John
>> PS PET and many later C= machines have one more problem: they didn't use
>> standard audio cassette machine, but one with a special Commie board in
it
>> and a custom interface.
>
> My knowledge of the PETs is limited. What would this setup do that would
> inhibit recording to CD?
Not so much inhibit, but make it less useable. I understood the idea as:
instead of plugging your home computer into a tape deck, how about a CD
player? Surely just the lead will be different? In which case, let's
archive all those tapes at a dozen C10 tapes to a CD...
With the PET and VIC families, it's not just a different lead, it's an
(admittedly llittle) circuit...
Philip.
< What about the ADAM computer from Coleco??? It uses a digital tape that
< holds (around) 256K or so... (Never set mine up yet).
<
< Is there any way you could run that thang thru an audio player and have
< PC routine re-digitalize it, or are you stuck with read a thing and
< serial-send it over to another PC?
No! It's digital saturation like a floppy and the encoding is to the
flux reversal timing.
Adam is digital stauration recording like a floppy only slower, audio
tape is audio frequency/phase change and the medium is the linear portion
of the BH curve. They are very different from each other.
Allison
Hi Christian,
----------
> From: Christian Fandt <cfandt(a)netsync.net>
> To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
> Subject: Re: ID these DEC floppy disks?
> Date: Monday, November 30, 1998 8:03 AM
>
> At 23:18 11/28/98 +0000, you wrote:
> >On Nov 28, 21:23, Pete Turnbull wrote:
> Now I have got to hunt for a decent reader of .ps files which works under
> windoze95 . . .
Have a look at:
http://www.cs.wisc.edu/~ghost/
I'm using gsview for years ...
cheers,
emanuel
On Nov 28, 21:23, Pete Turnbull wrote:
> If I can find the source files, I'll put machine-readable notes on my web
> pages (probablyt as PostScript). That is mostly XXDP V2 stuff. I
*might*
> have some machine-readble XXDP+ notes; if I can find any I put them up
too.
> I'll post a note to the list if and when...
Well, that turned out to be easier to find than I expected. Anyone
interested can take a look at
http://www.dunnington.u-net.com/public/XXDP.ps which has notes relevant to
both XXDP+ and XXDP Version 2.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
There are at least two of you folks I recall that are soliciting
ClassicCmp-relavant URLs to put into your webpages (Sam's VCF site is one)
for use as a reference resource. Here's one to add to your lists which is
DEC-related that I literally stumbled onto. Other DEC folks here may need
to bookmark this too:
http://www.celigne.co.uk/terminal/
Naturally, during all my previous hours of searching for VT102 info from
before I posted an inquiry last week, all the search engines I used could
not see this page. This is the one that answers all my VT100/102 questions.
An example of if we find a resource like this, please post it for others
(don't forget I'm still looking for *any* HP250 and IBM 9370 info!! ;) )
Regards, Chris
-- --
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt(a)netsync.net
Member of Antique Wireless Association
URL: http://www.ggw.org/freenet/a/awa/
>I'm a disgruntled ebay bidder.
>Why? Because I had an item picked off by a bargain hunter
>in the last 10 seconds of the bidding.
Why should you be disgruntled? The price went over what you wanted
to pay for the item, didn't it?
Tim.
Hi,
I'm a disgruntled ebay bidder.
Why? Because I had an item picked off by a bargain hunter
in the last 10 seconds of the bidding.
I have a simple suggestion that would fix this...an easy-to-implement
suggestion:
The act of placing a bid should automatically extend the
auction by 5 minutes.
Thus, if the auction is supposed to end at 15:00, and I sneak in a bid
at 14:59, the auction is automatically extended until 15:04. If someone
else then bids at 15:02, the auction is extended until 15:07.
If you like this idea, send a note to:
suggest(a)ebay.com
If you don't like the idea, you must not have bid on anything
at ebay :)
BTW, no...increasing my original bid isn't an acceptable solution,
for a wide variety of reasons ... bargain hunting not included.
thanks,
Stan Sieler
sieler(a)allegro.com
Hmm. Probably can't make the 26th, as I only go out there once every 5 years
or so. Later in the week, perhaps?
manney(a)lrbcg.com
>PG Manney wrote:
>>
>> I'm gonna be in Orange County over Christmas. What's the address of that
>> place?
>
>ACP is located on E. Edinger, and IIRC, it is located at 1310 E. Edinger in
>Santa Ana.
>
>> btw, anyone in O.C. who wants to meet and talk about old computers?
>
>Unless something unexpected happens, both John and I will be at the TRW
swap
>meet on December 26th. It starts at 7:00 am and is over at 11:00 (no
>transactions permitted after 11:30am.) Weather permitting, I usually go on
>the transmitter hunt there starting about 11:45 or so, and then out to
>brunch about 12:15 or so. Aaron joined us yesterday, and provided a good
>chance to talk about the older computers!
>
