13 Jul
2005
13 Jul
'05
1:43 a.m.
Got the 2nd rack attached & cleaned up, as well as installed an 861C power
control module. It's ready for the BA11 and then the other peripherals.
Of course, when I went to get about mounting the BA11, I realized I have the
inner rails (still bolted to the BA11), but I don't have the outer rails.
These rails look exactly (to me) like the 11/34 mounting rails, with the
pull-forward-and-the-box-tilts-setup. I've heard these 11/34 type rails are
unobtanium. So, does anyone have spare outer rails for those type if rails -
or any suggestions as to other ways to rack it up? I took the inner "tilting
rails" off the BA11 to see if any other slides I have might work (but not
tilt of course) and the holes just don't seem to line up in any good way.
Thoughts? I have truckloads of RA81 slides spare :>
The DL11 controller has a crystal that does odd baud rates, the only usable
one by any of my terminals is 110 baud (I think the crystal in it is like
408.xxxx or somesuch. I read in the docs that you can use a different
crystal and get more "common" (and higher) baud rates. The docs tell me what
speed crystal to get - but is this crystal something I can just order from
jameco/digikey/whoever and plug it in? The docs sound like it is only a
crystal swap required. Correct?
Thanks for any advice!
Jay West
13 Jul
13 Jul
2:43 p.m.
On 7/12/05, Jay West <jwest at classiccmp.org> wrote:
The DL11 controller has a crystal that does odd baud
rates, the only usable
one by any of my terminals is 110 baud (I think the crystal in it is like
408.xxxx or somesuch. I read in the docs that you can use a different
crystal and get more "common" (and higher) baud rates. The docs tell me what
speed crystal to get - but is this crystal something I can just order from
jameco/digikey/whoever and plug it in? The docs sound like it is only a
crystal swap required. Correct?
The crystal swap for the KL8E would be a 5.0688MHz... might that be
it? In any case, AFAIK, besides a crystal swap, the only think you
might check is how many stop bits it's strapped for. With 110 bps, it
might be set up to work with an ASR-33 which wants 2. Terminals,
being non-mechanical, are happy with 2 or 1.
-ethan
7:54 p.m.
>>>> "Jay" == Jay West <jwest
at classiccmp.org> writes:
Jay> The DL11 controller has a crystal that does odd baud rates, the
Jay> only usable one by any of my terminals is 110 baud (I think the
Jay> crystal in it is like 408.xxxx or somesuch. I read in the docs
Jay> that you can use a different crystal and get more "common" (and
Jay> higher) baud rates. The docs tell me what speed crystal to get -
Jay> but is this crystal something I can just order from
Jay> jameco/digikey/whoever and plug it in? The docs sound like it is
Jay> only a crystal swap required. Correct?
Sounds right. I couldn't find the doc you mentioned -- the ones I
checked on bitsavers don't show the frequencies, but they do show that
you get your choice of four "speed groups" according to the crystal
you pick.
Anyway, Jameco or Digikey may work, if the frequency you need happens
to be a stock one. If not, contact a crystal manufacturer. In years
past, I've ordered crystals for a custom frequency, quantity one,
completely painlessly from International Crystal. It seems odd, but
they have no trouble with custom orders for just a single part.
paul
8:13 p.m.
Paul wrote....
Sounds right. I couldn't find the doc you
mentioned -- the ones I
checked on bitsavers don't show the frequencies, but they do show that
you get your choice of four "speed groups" according to the crystal
you pick.
That chart should have the frequencies at the top over each speed group.
I
think it was the DL11-A,B,C,D printset I was looking at that listed the
frequencies.
Anyway, Jameco or Digikey may work, if the frequency
you need happens
to be a stock one. If not, contact a crystal manufacturer. In years
past, I've ordered crystals for a custom frequency, quantity one,
completely painlessly from International Crystal. It seems odd, but
they have no trouble with custom orders for just a single part.
Yeah, I tried Jan
Crystals, they said they couldn't sell me a new crystal
unless I knew something called the "load factor" of the existing crystal.
That tidbit I don't see in the documentation. They also wanted $20 each, and
that seemed a bit steep.
At some point in the future I'd like to upgrade the crystals on both my
M7800's. However, in the mean time I have found a M7856 which makes for a
much more usable console speed :)
Jay
11:48 p.m.
Anyway, Jameco
or Digikey may work, if the frequency you need happens
to be a stock one. If not, contact a crystal manufacturer. In years
past, I've ordered crystals for a custom frequency, quantity one,
completely painlessly from International Crystal. It seems odd, but
they have no trouble with custom orders for just a single part.
Yeah, I tried Jan
Crystals, they said they couldn't sell me a new crystal
unless I knew something called the "load factor" of the existing crystal.
That tidbit I don't see in the documentation. They
also wanted $20 each, and
that seemed a bit steep.
Sounds about right for a 1-off, actually. What frequency do you need, BTW?
-tony
10:49 p.m.
The DL11 controller has a crystal that does odd baud
rates, the only usable
one by any of my terminals is 110 baud (I think the crystal in it is like
408.xxxx or somesuch. I read in the docs that you can use a different
IIRC the board has a divide-by-2^n circuit between the oscillator and
the UART, where <n> is determined by the (rotary) switches.
Which means that one frequency of crystal will give you the standard
doubling series of baud rates -- 150, 300, 600, 1200, 2400, etc. The odd
frequency crystals were used for things like 110, 134.5, etc. In ganeral
only one divisor setting gave a useful baud rate with those other
crystals (the crystal you have presumably also gives 220, 440, etc baud,
but nothing uses those rates).
crystal and get more "common" (and higher)
baud rates. The docs tell me what
speed crystal to get - but is this crystal something I can just order from
jameco/digikey/whoever and plug it in? The docs sound like it is only a
crystal swap required. Correct?
It is just the crystal that uou need to change. And I think the one for
300/600/1200/etc baud is a normal frequency. The problem will be getting
it in a can that will plug into DEC's socket, but I think you can just
solder the crystal to the tags on that socket if you have to.
I beleive there are companies that will custom grind just about any
frequency crystal. Radio amateurs used to know of such places to get the
crystals to put PMR, etc radios onto the amateur bands. The price wasn't
that high if you didn't mind waiting.
-tony
7122
days inactive
7122
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ard＠p850ug1.demon.co.uk -
ethan.dicks＠gmail.com -
jwest＠classiccmp.org -
pkoning＠equallogic.com