Allison wrote:
> RT-11 is an ideal OS for this.
Just what I thought! :-)
> >> I'd like to see PSK31 software for the -11.
> >
> >I have not looked into the details of all new digital transmission
> >modes that HAMs use (for example with MixW), but without any
> >knowledge, I wonder if a PDP-11 would be fast enough ...
> >any idea about that, Allison ?
>
>
> this is off topic and maybe outof band for this forum:
> The real problem is doing the base band audio processing
> currently it's done with PCs and sound cards. The modulation
> is narrow (200hz or less) band QPSK at around 31 baud or so.
> The usual reciever is SSB so the challenge is that the audio
> stream is 500-2500hz bandwidth and multiple converstaions can
> take place so digital filtering is done to seperate and
> detect the signals. Seems to require a P200 or faster. But I
> haven't dug deep enough. I have asked one question around
> but no one has answered and that is what if the reciever
> (radio) was narrow selectivity (say 300hz) so that only one
> data stream could be heard, would that simplify the
> filter/detect/decode process enough for a much slower processor?
>
> Allison
Yes, indeed going off topic, but it was sort-of relevant as it
dealt with the possibility in combination with a PDP-11 ... but
thanks Allison. Your last question calls for some investigation.
I hope nobody jumps on this bandwagon, but I guess one brief
reply will not hurt the list. Anyway, it is more on topic
than some recent threads I've seen here ... [pse no flames].
"Close all hailing frequencies, Uhura".
- Henk, PA8PDP.
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>
>Subject: RE: VCF 8.0 Pictures
> From: "Gooijen, Henk" <henk.gooijen at oce.com>
> Date: Fri, 11 Nov 2005 13:11:24 +0100
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>Allison wrote:
>
>> >> On display I can have:
>> >>
>> >> 2) Homebrew pdp8/e running (slow) OS/8 or DMS
>>
>> Howbout a 6120 homebrew running OS8? The trick was real DEC
>> style IO rather than PIEs and cruft that leads up to os78 and os278.
>
>I don't have a 6120. The heart of my homebrew pdp8/e is a 6809!
Ah, the 6120 is the PDP-8 on cmos core of the DECmate-III. Thats
different from an emulation.
>> >> 3) PDP-11/03, a real one for a change :-) decoding HAM radio RTTY
>>
>> I've used the -11 for RTTY display. You only need a modem to
>> decode the tones though having spilt screen, upper for
>> incomming and lower for outgoing text.
>
>That is exactly what I intend to write. Not too difficult, I will
>document this project on my website. I am combining the actual
>*use* of a PDP-11 for something, learn to write PDP-11 assembler,
>and program ESC sequences for a VT220. Not just simple "hello",
>but a project with a goal.
Should be fun. It's fairly straightforward. Think ring buffer
for incomming and long buffer for outgoing as the system tends
to be half duplex mostly recieve. RT-11 is an ideal OS for this.
>> I'd like to see PSK31 software for the -11.
>
>I have not looked into the details of all new digital transmission
>modes that HAMs use (for example with MixW), but without any
>knowledge, I wonder if a PDP-11 would be fast enough ...
>any idea about that, Allison ?
this is off topic and maybe outof band for this forum:
The real problem is doing the base band audio processing currently
it's done with PCs and sound cards. The modulation is narrow
(200hz or less) band QPSK at around 31 baud or so. The usual reciever
is SSB so the challenge is that the audio stream is 500-2500hz
bandwidth and multiple converstaions can take place so digital
filtering is done to seperate and detect the signals. Seems to
require a P200 or faster. But I haven't dug deep enough. I have
asked one question around but no one has answered and that is what
if the reciever (radio) was narrow selectivity (say 300hz) so that
only one data stream could be heard, would that simplify the
filter/detect/decode process enough for a much slower processor?
Allison
Allison wrote:
> >> On display I can have:
> >>
> >> 2) Homebrew pdp8/e running (slow) OS/8 or DMS
>
> Howbout a 6120 homebrew running OS8? The trick was real DEC
> style IO rather than PIEs and cruft that leads up to os78 and os278.
I don't have a 6120. The heart of my homebrew pdp8/e is a 6809!
> >> 3) PDP-11/03, a real one for a change :-) decoding HAM radio RTTY
>
> I've used the -11 for RTTY display. You only need a modem to
> decode the tones though having spilt screen, upper for
> incomming and lower for outgoing text.
That is exactly what I intend to write. Not too difficult, I will
document this project on my website. I am combining the actual
*use* of a PDP-11 for something, learn to write PDP-11 assembler,
and program ESC sequences for a VT220. Not just simple "hello",
but a project with a goal.
> I'd like to see PSK31 software for the -11.
I have not looked into the details of all new digital transmission
modes that HAMs use (for example with MixW), but without any
knowledge, I wonder if a PDP-11 would be fast enough ...
any idea about that, Allison ?
- Henk, PA8PDP.
This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law.
If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited.
If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message.
Thank you for your cooperation.
>
>Subject: Re: VCF 8.0 Pictures
> From: Ladyelec at aol.com
> Date: Fri, 11 Nov 2005 06:58:37 -0500 (EST)
> To: cctalk at classiccmp.org
>
>In a message dated 11/10/05 4:59:59 PM Central Standard Time,
>cctalk-request at classiccmp.org writes:
>
>> Ahem. Aging, bald, bespectacled, spreading geek men aren't beefcake
>> >enough for ya?
>> >
>> >
>> > Doc
>>
>> Well, you old farts look at the girls. What's ya think us girls are doin?
>>
>>
>> Allison
>
>Looking at the sons of Aging, bald, bespectacled, spreading geek men !
>Isa
Ah, it's been a while since I've heard that one.
Allison
Tony wrote:
> > Ok, so the CNTRL key behaviour analysis is a good point
> > to start with.
>
> Well, it's a definite fault. I would guess the firmware is
> doing the wrong thing (I can't see how a hardware fault in
> the keyboard or display could do this).
>
> > But I will first inspect the two RAM chips!
>
> What are the RAMs? From the description, they sound like the
> little TTL RAMs that DEC also used for register storage on
> some of the '11 CPUs
>
> -tony
If my eyes read it correct, the RAMs are DEC 85S68. A Google
search shows that it was made by National Semiconductor and
that it is a 64-bit static RAM. My eyes are still good :-)
I did not find a datasheet, unless you order and pay for it!
The schematic is clear enough to figure things out ...
- Henk, PA8PDP.
This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law.
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In a message dated 11/10/05 4:59:59 PM Central Standard Time,
cctalk-request at classiccmp.org writes:
> Ahem. Aging, bald, bespectacled, spreading geek men aren't beefcake
> >enough for ya?
> >
> >
> > Doc
>
> Well, you old farts look at the girls. What's ya think us girls are doin?
>
>
> Allison
Looking at the sons of Aging, bald, bespectacled, spreading geek men !
Isa
On Nov 9 2005, 19:45, mike ingram wrote:
> It might just be weak power supplies. There was a recall issued by
> SGI about the Challenge XL power supply, I remember our SGI tech
> dropping by to replace the PS on our Challenge XL . The machine ran
> 24/7 on a UPS for years and we were always very worried about turning
> the darn thing off.
Interesting. I've just been offered a Challenge L, disfunctional due
to faulty PSU. AFAIK that's just a half-size version of the XL,
effectively. If I get it, where should I start?
--
Pete Peter Turnbull
Network Manager
University of York
Hi,
I have a large quantity of un-used 2 volt cells, used (but still working
well!) 12 volt batteries, and a selection of 12V, 24, and 48V battery back ups.
Some of this can be delivered in IL and IN, and WI. I use some of these items
with my work in solar and wind energy.
Thanks, Paul
Hello Gene,
that is exactly what I did a few days ago.
Note that the *new* address must be approved by admin,
and that takes time ... In my case half a day, so pretty fast.
I did it via the classiccmp website's links.
If you don't want to miss any posts, it is perhaps clever
to subscribe with the new address before you unsub the old one!
BTW, you are notified that your new e-mail address is pending
after you register the new address. IMHO it would have been
more clever to notify this pending approval some place else
than *after* you actually register for the new e-mail address.
- Henk, PA8PDP.
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Gene Ehrich
> Sent: vrijdag 11 november 2005 10:06
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: how do I change e-mail address ???
>
> I would like to change my e-mail address for this Classic
> Computers list. I looked up the old faq.
>
> Are these the commands to use
>
> UNSUBSCRIBE CLASSICCMP OLD.Address
>
> SUBSCRIBE CLASSICCMP NEW.Address
>
> and do I send them to:
> cctalk at classiccmp.org
This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law.
If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited.
If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message.
Thank you for your cooperation.
I would like to change my e-mail address for this Classic Computers
list. I looked up the old faq.
Are these the commands to use
UNSUBSCRIBE CLASSICCMP OLD.Address
SUBSCRIBE CLASSICCMP NEW.Address
and do I send them to:
cctalk at classiccmp.org
