>> I used a TTY ASR-33 as a printer for my PET years ago. My memory is
>> that if I left the receiver open circuit, i yammered away printing
>> nulls; if I shorted out the loop it didn't. I interfaced it using one
>> transistor - no power supply was necessary.
>>
>> +----------------------
>> |
>> OUT b |/c
>> -------/\/\/\/---------| NPN TTY
>> |\e
>> PET |
>> -------------------------+----------------------
>> GND
>
>
> For I've got a Kludge
> And a good Kludge too ;-)
>
> Seriously, that works. I've done it myself a few times. But it's not the
> official way to drive a teletype - the external device should source the
> loop current. And I prefer to teach people the right way and let them
> find out the kludges for themselves.
Oh, yes. Absolutely. But I was disagreeing with your assertion that
while 5V might do for the transmit loop, you'd "need" 12V for the
receive loop.
>> Note: I never interfaced the TTY transmitter - not even for reading
>> paper tape (don't know why not)
IIRC, one of the problems I had was the high resistance of the transmit
loop - many kilohms, I think. It probably was mostly contact resistance
and highly non-linear i.e. apparent resistance would be less at higher
currents), but I wouldn't like to use only 5V. I'd suggest a reasonable
sized decoupling capacitor to get rid of contact noise, too - say, up to
1 microfarad.
> Err, because the ASR33 reader is horrible and mangles tapes? You have a
> Trend, don't you?
This was at least 4 years before I ever _saw_ any other paper tape
stuff. Long before I got the Trend. Or even my little DSI box. (DSI =
Data Specialties Inc. They made a 30cps reader/punch unit that was sold
in the UK by a small company called Teleprinter Equipment Ltd. Never
met either of them anywhere else.)
Philip.
<> It interests me why some one wants a particular machine especially
<> since you do not seem to know much about it.
<
<Well, I can't speak for the person you were replying to, but in my
<case I'm often interested in machines I know little to nothing about
<because I'm interested in learning about them. Although you can
<learn a lot without one, it can help if you have one to explore.
That is a good reason. The fear I have and have encountered is people
lusting for an XZ21 and when they get it find they are totally in over
their head to do programming or hardware troubleshooting often required.
The NS* was a good machine but it was S100 and beyond some general things
was not a pop in a board and play thing like PCs. I get real scared
when some one asks me if a VGA monitor works with a Altair or did it
require a XT style keyboard!
Allison
I will say Amen to that, considering that I just mailed 9 boxes of
MS-DOS 3.3 which were still shrinkwrapped and beign thrown away by
my school. THat has to be $500 right there that could have been used
on pencils. I won't complain about the fate the DOS 3.1 boxes met...
>
>>
>> Personally, I believe the "computer literacy in schools is
everything"
>> movement is a result of inept teachers and a haywire NEA.
>
>Amen!
>
>> students should be introduced to computers (read: word
>> processors/calculators) until the first year of high school after
>> mastering basic reading, comprehension, writing and math skills.
>
>
>The problem with introducing elementary and middle school kids to
>computers so early is that they either a) know more than the lab admin,
or
>b) aren't allowed to use them in any constructive way. I'm only in the
>tenth grade, but I've already seen seven new labs installed in area
schools.
>The school districts almost ALWAYS spend WAY too much on new computers,
>mainly from the worst vendors, only to have to replace them when the
>warranty runs out (with very little usage, BTW). The computers simply
>aren't used until high school, when word processing/database,
programming,
>and other such courses are offered. Anything before is mainly a waste
of
>money.
>
>What about the 'net? I don't understand why people think that the
>internet is such a great "tool" that will help schools. Just do a
search
>for "barbie" on Yahoo. Or, for that matter, try "video" or something
>general. Especially considering that most schools don't use any
>Internet blocking software..
>
>It takes most people a long time to get used to using search engines in
such a
>way to get what they want. Most people in my school don't have any
idea how to
>use the 'net, and could care less. That is the general attitude at
most
>schools that I have been to.
>
>In other words, most of the money spent on computer equipment is a
waste.
>
>
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
If you haven't seen the news yet, I found out thanks to http://slashdot.org
, Microsoft is pulling one of their dirtiest stunts ever in their attempt
to destroy Netscape. If anyone doesn't think Microsoft is evil this should
convince them, unless they are niave enough to think Microsoft isn't behind
this!
In what would appear to be a result of their assimilation of Wang last
month, Wang has announced a Lawsuit against Netscape for Patent
infringement. Basically Wang is claiming to have "Save As..."
patented?!?!?! For an explanation see
http://www.mozilla.org/legal/wangsuit.html I also like the Graphic and
comment at http://www.mozilla.org
The problem is, Wang is sueing them for something that almost EVERY piece
of software available does! Netscape needs examples of software that do
the things in the patent prior to March 30th, 1983. See the below
information.
Wang might be able to use this to get a Court injunction to prevent
Netscape from distributing Navigator?!?! A lot of the Free Software
fanatics are seeing this as a direct attack against free software by
Microsoft, since Netscape just released the Navigator source code.
Zane
Here is the portion of the statement that is the most important:
-----------
Wang is asserting that a patent that it holds for a video text system is
infringed by the Netscape browser. Netscape is vigorously defending the
lawsuit. Wang contends the patent discloses the invention of:
Saving web pages retrieved from a server using "Save As" (See Claim
23, 24),
Bookmarks (Claims 20-22),
Saving files with file extensions and then retrieving the pages and
decoding the files based on the file extension (Claim 38).
The patent was filed in 1984. We believe the patent is noninfringed,
unenforceable, and invalid based on, among other things, prior art such as
the
Alto & Star computers from Xerox Parc, Terminal Emulators, connectivity
software prevelant in the the early 80s such as CrossTalk, Unix
symbolic links (ln -s), and various other "video text" systems like
Telidon, Prestel, Mupid used in the late 70s, early 80s.
It's easy to say "of course that's invalid", but what is required are
specific references to prior art. If you know of additional prior art
publications,
software programs, books, or systems in existence --prior to March 30,
1983-- which disclose and/or describe the claimed elements send us a
message. Send responses or questions to mozilla.org. Please include the
following information:
Name of the Publication or System
Date of the Publication or Date System Was Publicly Known
Features it Discloses
Where Can the Publication or System Be Found (ie. university,
reference library, company, contact person)
----------
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)ix.netcom.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| For Empire of the Petal Throne and Traveller Role Playing, |
| see http://www.dragonfire.net/~healyzh/ |
| For the collecting of Classic Computers with info on them. |
| see http://www.dragonfire.net/~healyzh/museum.html |
>Qoo, Tim!
>Wadda hell...
If you say so. ;-) Anyway good to see you subscribed.
>>OS/2 !! SYS01475
>>OS/2 !! SYS02027
>>
>>So anyway, it freezes like that. This, BTW, is on a 2.1GB HDD, with no
>>other OS'es currently installed.
>It may be 2.1G that causes the problem - if it is used as single partition.
>I heard that Warp3 isn't too well in handling big partitions. Try breaking
>it into smaller pieces (<1G)
Oh, yeah, that's why I gave specifically 2.1GB. So I'm going to have the
boot manager, 120MB for Warp, 700 for Linux and the rest for Windows
(remember, I need to run some Win32 apps, not by choice.)
>hope that helps,
>-andy
Tim D. Hotze
Kai-
I am interested in purchasing the North Star Horizon. I am not local
and don't have a trade so would be a cash deal.
Do you have any info about the machine such as amount of memory, type of
floppy(ies), last known operating system, hard drive (if any), keyboard,
monitor, and condition (working/nonworking).
Thanks
Randy Staponski
With the recent discussion on the MTPRO price guide, the ZX80 bashing,
and a bit further back the Enrico Tedeschi flame festival, I found it
quite amusing to run across the following entry at eBay:
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=13957826
For those without a web browser, I'll just say that this is a book on
Sinclair computer history, being auctioned by the author of the MTPRO
price guide (who goes by the handle "ClassicComputing" at eBay). Most
remarkable of all, the book was authored by a gentleman named Enrico
Tedeschi.
--
mor(a)crl.com
http://www.crl.com/~mor/
I'd love to check out the MIT Flea Market. When and where is it?
"J. Maynard Gelinas" <maynard(a)jmg.com> on 05/14/98 01:15:48 PM
Please respond to classiccmp(a)u.washington.edu
To: "Discussion re-collecting of classic computers" <classiccmp(a)u.washington.edu>
cc: (bcc: Bill Sheehan/Corporate/SWEC)
Subject: Re: Can we talk about computers at least?
Well Agreed!
Sorry I haven't been active in the list much... between work and
a family illness I've been _busy_! BTW: Anyone planning on attending
the MIT Flea market this Sunday? I doubt prices are going to be
reasonable what with that $100 PDP-11/23 last month.
--jmg
> From: Sam Ismail <dastar(a)wco.com>
> Subject: Can we talk about computers at least?
>
> People.
>
> Could we move the discussion about the perceived woeful inadequacies of
> the current state of public education to a more appropriate forum? Like
> say a usenet group? Or a new mailing list? Basically anywhere but here,
> where it really does not belong?
People.
Could we move the discussion about the perceived woeful inadequacies of
the current state of public education to a more appropriate forum? Like
say a usenet group? Or a new mailing list? Basically anywhere but here,
where it really does not belong?
Thanks in advance.
Sam Alternate e-mail: dastar(a)siconic.com
-------------------------------------------------------------------------------
Ever onward.
September 26 & 27...Vintage Computer Festival 2
See http://www.siconic.com/vcf for details!
[Last web page update: 05/11/98]
This is for those of you in the Chicago area, and anyone else that
might be able to help me. I am just writing to ask if some of you
might be able to direct to some good classic computer sources in the
Chicago, Illinois area. I am leaving for Chicago for the weekend, and
will have some free time to browse thrift shops, etc. Any place that
might have a good stock of old 8-bitters?
Thanks,
CORD COSLOR
--
____________________________________________________________
| Cord G. Coslor : archive(a)navix.net |\
| Deanna S. Wynn : deannasue(a)navix.net | |
| on AOL Instant Messenger: DeannaCord | |
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