Re: HP 21mx/whatever processor works with doublesided key... i forgot model#

2017-10-19 Thread Ed Sharpe via cctalk 
did not look too close but hope the fuse holder is easy to replace... 

Sent from AOL Mobile Mail

On Thursday, October 19, 2017 Mike Loewen via cctalk  
wrote:
On Thu, 19 Oct 2017, Ed via cctalk wrote:

> Progress!
>
> HP 21mx/whatever processor works with double sided key... (I forgot
> model#)

2108A, perhaps?

> Now to replace the fuse holder on the back... that is mushed.

So is the one on my 2108A.

> It has ... of all things 3 tty boards in it? what is with that? Multi
> user without a mux?

My 2113E has 3 BACI cards, because I don't own a MUX. Anyone have a 
spare 12792A?


Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/

Re: OT: the death of shortwave / Re: Hallicrafters S-85

2017-10-19 Thread Marc Howard via cctalk 
KISS.  Keep It Single Sideband.  Not many can do AM and even fewer have
linear amps for that.  Ditto for HF digital.

And the anoying thing about nets is the ionisphere can't tell time.

That said, it is much easier to do coast to coast now with WebSDR.  Go to
websdr.org and choose a receiving site.  They have way better antennas than
you or I and you can (cheat) pick one near the person your talking to.

Marc
NC6SU


On Thu, Oct 19, 2017 at 7:42 PM, Lyndon Nerenberg via cctalk <
cctalk@classiccmp.org> wrote:

>
> > On Oct 19, 2017, at 7:15 PM, Ed Thierbach via cctalk <
> cctalk@classiccmp.org> wrote:
> >
> > I'd be interested in a classic computing net as well.  I have 40 - 10
> > meters available on HF.  Our area is lagging in digital repeater
> coverage,
> > so no Fusion or DMR or D*Star for me just yet.
>
> This would be cool.  Since it's computing-related, an HF digital mode
> would be appropriate, no?  Preferably something I could chat on with my
> 5W-into-a-mag-loop-on-the-balcony setup :-P  Seems appropriately stone
> aged for the computers we're talking about ;-)  And the bit rate sounds
> about right for matching the various card/paper-tape/ readers.
>
> --lyndon (VE7TFX et al)

Re: OT: the death of shortwave / Re: Hallicrafters S-85

2017-10-19 Thread Lyndon Nerenberg via cctalk 

> On Oct 19, 2017, at 8:39 PM, Marc Howard  wrote:
> 
> That said, it is much easier to do coast to coast now with WebSDR.  Go to 
> websdr.org and choose a receiving site.  They have way better antennas than 
> you or I and you can (cheat) pick one near the person your talking to.

WTF does that have to do with playing *radio*? :-P

Re: HP 21mx/whatever processor works with doublesided key... i forgot model#

2017-10-19 Thread Mike Loewen via cctalk 

On Thu, 19 Oct 2017, Ed via cctalk wrote:


Progress!

HP 21mx/whatever   processor   works  with double  sided  key... (I forgot
model#)


   2108A, perhaps?


Now  to replace the   fuse holder on the back... that  is  mushed.


   So is the one on my 2108A.


It has ... of all things  3  tty  boards in it? what  is  with that? Multi
user without  a  mux?


   My 2113E has 3 BACI cards, because I don't own a MUX.  Anyone have a 
spare 12792A?



Mike Loewen mloe...@cpumagic.scol.pa.us
Old Technology  http://q7.neurotica.com/Oldtech/

Re: OT: the death of shortwave / Re: Hallicrafters S-85

2017-10-19 Thread Lyndon Nerenberg via cctalk 

> On Oct 19, 2017, at 7:15 PM, Ed Thierbach via cctalk  
> wrote:
> 
> I'd be interested in a classic computing net as well.  I have 40 - 10
> meters available on HF.  Our area is lagging in digital repeater coverage,
> so no Fusion or DMR or D*Star for me just yet.

This would be cool.  Since it's computing-related, an HF digital mode would be 
appropriate, no?  Preferably something I could chat on with my 
5W-into-a-mag-loop-on-the-balcony setup :-P  Seems appropriately stone aged for 
the computers we're talking about ;-)  And the bit rate sounds about right for 
matching the various card/paper-tape/ readers.

--lyndon (VE7TFX et al)

Re: OT: the death of shortwave / Re: Hallicrafters S-85

2017-10-19 Thread Ed Thierbach via cctalk 
I'd be interested in a classic computing net as well.  I have 40 - 10
meters available on HF.  Our area is lagging in digital repeater coverage,
so no Fusion or DMR or D*Star for me just yet.
73,
-Ed- AB8OJ

On Mon, Oct 16, 2017 at 2:58 PM, Ben Sinclair via cctalk <
cctalk@classiccmp.org> wrote:

> On Mon, Oct 16, 2017 at 1:24 PM, Ian S. King via cctalk <
> cctalk@classiccmp.org> wrote:
>
> >
> > Does anyone on this thread know if there are any regularly scheduled
> > traffic nets?
> >
>
> I don't do much with HF nets, traffic or otherwise, but I would be
> interested in participating in an informal classic computing net if we
> could get one going! I'm mostly active on 20M and 40M.
>
> --
> Ben Sinclair
> b...@bensinclair.com
>

HP 21mx/whatever processor works with doublesided key... i forgot model#

2017-10-19 Thread Ed via cctalk 
Progress!
 
HP 21mx/whatever   processor   works  with double  sided  key... (I forgot 
model#)
 
Thank goodness  for that  guy ion  ebay selling them!
 
 I  got  2... one to use...and  one  to   loose/put in bag of keys.
 
Now  to replace the   fuse holder on the back... that  is  mushed.
 
It has ... of all things  3  tty  boards in it? what  is  with that? Multi 
user without  a  mux?
 
Has  2  memory boards   think I  remember   64k total.
 
need to  find a  paper tape  basic   to   play  with.
 
Any other  advice?
 
Ed#

Re: HP 7907 read preamp question

2017-10-19 Thread Chuck Guzis via cctalk 
On 10/19/2017 05:00 PM, Jon Elson wrote:

> Well, you might have to turn it back down for newly recorded tapes. But,
> if you are using it only for recovery of old data, maybe no downside at
> all.
> 
> But, there are so many defects in old tapes.  There's print-through,
> wrinkles from the tape pack scrunching, weave, oxide flaking, dirt
> buildup, and maybe some others.

Each batch of tapes goes through a bake, then cleaning, so I don't worry
too much about dirt and oxide.   A lot of these tapes though, have been
through several cycles of re-use (going by the verification stickers on
the back of each reel), many have had tape removed (I assume because
tape tends to wear more at the beginning of the reel and a new BOT
sticker was applied to salvage the remainder). In other words, they
weren't virgin when last recorded.

So, the results are variable--but it's surprising how many 50-year old
tapes read without any error.

--Chuck

HP 7907 read preamp question

2017-10-19 Thread Chuck Guzis via cctalk 
Here's an idle question with regard to the HP 7907 tape drive.

The service manual says to adjust read preamp output (using a
calibration tape) to 6.4V P-P.

Generally, this is working quite well, but there is an occasional tape
where I believe the signal levels have "faded" a bit, leading to the
occasional, but not infrequent parity error.

My question for those knowledgeable with this drive is what's the
downside of adjusting the gain to create an output of, say, 7V P-P?

--Chuck

RT11 Disk Partitioning and RQZX1 SCSI controller

2017-10-19 Thread Douglas Taylor via cctalk 

Is there a potential problem here?

I have an 11/53 microPDP11 with a RQZX1 controller connected to a single 
DEC DSP3043 drive (535MB) and a single RX33 floppy.


The autoconfigure setup in the RQZX1 puts the hard disk at DU0 and the 
Floppy as DU1.  OK.  I boot RT11 from the disk, V5.7. Works fine.


I would like to use some of the extra space on the disk by setting up 
RT11 disk partitions.


However, one of the partitions is DU1, but that is what the Floppy is 
called.  How do I stay away from what seems like a conflict?


Doug