William Donzelli <william(a)ans.net> wrote:
> Lots of the stuff I have seen allows a user to insert an external clock -
> this can be handy for testing in the real world. Providing the clock is no
> big deal. Sure, it would be nice to get a dead-on clock for a T1, but as
> long as you keep the circuit private, the clock can be fairly sloppy.
Thanks for jogging my memory about that, I guess I've been in denial
about this stuff for a while. Yeah, if you're just running over a direct
cable (which is what I was thinking about) you'd be OK doing this.
> > Can you do this over dry copper, for short runs?
>
> Yes, some people on this list get connected this way (T1s that run a whole
> 20 feet, CSU to CSU, with no frame in between). A horrible kludge in a
> production environment, in my opinion, but it worked for quite a few
> years. Recently someone at ANS suggested that we use a T3 the same way,
> but he ended up being tarred and feathered.
Umm...why were you doing this? I can understand it for testing and as
a crude but expensive bandwidth limiter.
> > If so, would you want to? You mentioned in another post that you'd
> > have to run conduit for FDDI, and that makes me think there might be
> > some open space between hither and yon. Sure, you could run copper,
> > but wouldn't electrical potential differences be a problem?
>
> Differences as in losses due to the long run? That is what the Line Build
> Out option is for (on most CSUs). T1s, with thier twisted pair,
> differential design, tend to be pretty tough.
No, I was thinking about differences in ground potential between the
two buildings, static electricity, lightning strikes, that sort of
thing. All the canonical reasons why you wouldn't want to pull
Ethernet coax through that conduit.
-Frank McConnell
On Fri, 31 Jul 1998, I wrote
] Okay, I've now given up hope that those old modems will ever be
] at all useful or interesting to me. So they're up for grabs,
] for the cost of postage.
] ...blah, blah, blah...
To which there were several replies...
......................................................................
Tim Shoppa <shoppa(a)alph02.triumf.ca> wrote:
] > ... The consensus seems to be that they need some associated
] > equipment to do the dialing.
]
] The "associated equipment" is nothing more than a regular phone.
] ...
Can you tell me how to do that? An earlier reply (from Bill Pechter?)
said I needed a "dataphone", and would dial with that and then press
a "data" switch. I have neither a dataphone nor a data switch...
I did try mucking around with the "talk" switch and an ordinary telephone,
but couldn't get any interesting behavior out of them. (Ie: I connected
the "telco" socket on the modem to the phone line from the wall, and
then the telephone into "telset" on the modem. I also tried connecting
both the modem and the telephone to the wall via a "Y" adapter. Did I
miss some obvious thing? I don't now remember which setup gave what
results, but in the cases when I could actually dial out and get a
carrier, I couldn't get the modem to do anything about it.)
......................................................................
Russ Blakeman <rhblake(a)bbtel.com> wrote:
] > ... None respond to the Hayes "AT" command set, and each has a ...
] have you tried thr Racal Vadic command set, and do they have to be AT
] command compatible? I have a box stashed out in the storage building with
] a bunch of old modems, 300/1200/2400 types and all externals. I'll have
] to dig fo them this weekend (along with the Commie stuff I was supposed
] to get last weekend) and see what there is and let you know. What exactly
] are you planing to do with the modems and what speed do you need?
I've never even heard of the Racal Vadic command set, although I do
recognize the name as an old modem manufacturer. Hints would be welcome.
I don't have any real need for these modems, except that they are old
computer stuff, and were on their way to a land fill. I snagged 'em
mainly thinking that somebody on this list might be interested in them.
I could easily picture them on a shelf next to a Vax, happily chugging
away. (And for that purpose, I might hang onto one of them for myself.
But that leaves three taking up floor space.)
] > Similarly, I've got a Sytek 2532 Packet Communications Unit, with...
] Almost sounds like a multiplexer unit.....someone has a boat without an
] anchor out there.
:-)
Well, one man's anchor is another man's treasure, right? We aren't
hanging around on this list because we only like the fastest compustuff.
Anybody with a basement full of old computers might very well want some
old networking stuff to glue them together with.
As for me, I don't even have a basement. But I am off to a good start;
I have stuff to populate one.
......................................................................
Jack Peacock <peacock(a)simconv.com> wrote:
] Bill Yakowenko wrote:
] > There are two BellSouth 212A's, and two similar modems by Penril.
] From my experience with Penril modem the best thing you can do is send
] them to the dumpster. ...
What, no warm fuzzy nostagic feelings for these? :-)
How about this, slap a 56K modem inside the shell, maybe even wire up
the front-panel LEDs appropriately, and amaze your friends. It all
depends on what kind of thrill you're after.
......................................................................
BTW, if I come across more junk like this, should I continue to post
it here, or should I just list it on that web page and assume that
interested parties will find it?
Cheers,
Bill.
Okay, I've now given up hope that those old modems will ever be
at all useful or interesting to me. So they're up for grabs,
for the cost of postage.
There are two BellSouth 212A's, and two similar modems by Penril.
None respond to the Hayes "AT" command set, and each has a handful
of pushbutton switches on the front, as per my previous post.
Power supplies are all internal; they each have an ordinary 120v
line cord. The consensus seems to be that they need some associated
equipment to do the dialing. Because of this, I have no idea if
they work or not. They are each maybe 1' x 1' x 2", but not very
heavy. (That size is an estimate from memory, and might be off by
a bit).
I doubt they are useful in any modern setup, but they might be
regarded as classics. If nobody here wants them, they return to
the dumpster from which they came. My apartment now has negative
space available, if you know what I mean.
Similarly, I've got a Sytek 2532 Packet Communications Unit, with
about half a dozen boards in it. This is a rack-mount beastie, and
weighs like it, so it could be expensive to ship. Still, if you
want it, or any of the boards from it, let me know. Like the modems,
I have no way to test it, and no idea whether or not it works. But
I'd be thrilled to get it out of the trunk of my car. :-)
And maybe this is a good time to mention my "for trade" web page,
containing a list of compu-junk that needs a good home. It is at
this URL: http://www.cs.unc.edu/~yakowenk/classiccmp/fortrade.html
Cheers,
Bill.
Since I rediscovered a B500 in my junk some weeks ago,
I'm searching for information. Until now i could trace
nothing in the web or any magazine from that time.
The Computer in question is a Commodore B500, Basicly
a CBM II LP. I am not talking about the P500. The mobo
is technicaly the same than the CBM 610 (B128) but a
different layout (only some lines) and a (lower) part#.
Also the Version/Part#'s of the kernal/basic EPROMS are
lower than any known (to me) B128/B256/6x0/7x0 type.
The mobo and all chips are dated to 1982 - again way
before any other CBM II I know. AFAIR the CBM II line
was introducted in 1983.
Any Info would be usefull.
Gruss
H.
--
Ich denke, also bin ich, also gut
HRK
I finally got back to working on my PDP-11/44, and finished cleaning it up
yesterday. So now I'm ready to start testing stuff.
Which brings me to my question, I went ahead and plugged the TU-58 drives
in to see if they would give any indication of life. Not a thing. Do they
have to be plugged into the line (serial I think), or have a tape in them
before they will show any signs of life?
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)ix.netcom.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.dragonfire.net/~healyzh/ |
I have an unused and unregistered copy, complete, of Zenith Data
Systems/Heath Company's "Breakthrough Timeline" which appears to be
a
timeline creator/project manager. It has the original box, manuals,
key
template, registration certificate and the original 5.25" 360k
floppies
(still in the envelope). From scanning the manual it's roughly
1986/87
vintage and should run on most any machine from 8086/8088 up
through our
present array of hardware.
Really good condition visually too, might be good as part of a
collection.
Need $12 for it which includes mailing in the 48 CONUS states.
First
come, first serve. Email me direct for info.
--------------------------------------------------------------------
Russ Blakeman
RB Custom Services / Rt. 1 Box 62E / Harned, KY USA 40144
Phone: (502) 756-1749 Data/Fax:(502) 756-6991
Email: rhblake(a)bbtel.com or rhblake(a)bigfoot.com
Website: http://members.tripod.com/~RHBLAKE/
ICQ UIN #1714857
AOL Instant Messenger "RHBLAKEMAN"
* Parts/Service/Upgrades and more for MOST Computers*
--------------------------------------------------------------------
< > ;-)). But rubber is not the easiest material to turn to size - my gues
< > is you need to take a very light cut...
<
< With a very sharp cutting tool!
You don't cut it you grind it! If done on a lathe you turn the rubber
part and run a high speed grinder against it. It's insures it will be
concentric and gives a smooth surface.
the alternate is to spin the tire and work against a hard surfaced
abrasive board.
< > As a kludge, and to ensure it is concentric with the spindle, why not
< > the drive motor ? Put the oversize tyre on the spindle, get the motor
< > turning (a knowledge of how the drive operates, and the interface
< > signals, helps), and take a light cut over the surface with a sharp kn
< > blade.
disconnect the motor and power it from a supply rather than risk cooking
the drive electronics.
< Rather dependent upon the drive. In many, the tyre is rather
< inaccesible, and then there is the risk of jamming things up with rubber
< dust/shavings.
that is an issue too. the solution is to demount the moter and work off
drive.
Allison
I have for sale (or trade in some cases) the following items which may
be of interest to those looking for a second machine, a utility machine,
or just something cheap to tinker with...
*PS/2 Model 30 (2 floppy unit, no HDD)- 8088 mani unit/no ram - $15 +
shipping
*PS/2 Model 30's - 8088 main unit/no ram - $20 each + shipping
*PS/2 Model 30-286's - 286 main unit/no ram - $25 each + shipping
*PS/2 Model 50Z's - 286 main unit/no ram - $25 each + shipping
*PS/2 Model 55SX's - 386SX main unit/no ram - $30 each + shipping
*PS/2 Model 56SLC's - 486 main unit/no ram - $120 each + shipping (SCSI
drive)
*PS/2 Model 57SLC (1 only) - 486 main unit/no ram - $150 + shipping
(SCSI drive)
*PS/2 Model 65's - 386SX tower unit/no ram-$45 each + shipping (some
SCSI types)
*PS/2 Model 80's - 386DX tower unit/no ram-$50 each + shipping (some
SCSI types)
*IBM 5150 "PC" and 5160 "XT'" - inquire. Available w or w/o monitor or
keyboard
*IBM 5170 "AT"'s - 286 workhorse main unit, contents vary - inquire
Above are case, power supply, motherbd, floppy, hard drive, applicable
controller(s) in great shape but without memory. Memory will be obtained
by buyer or available with unit for a little more. All have built in VGA
video, serial, parallel, mouse and keyboard ports. Hard drive sizes
vary. All are tested and in great physical and electronic condition.
Also available:
*PS/2 Model 55SX motherboards - complete/no ram - $10 each + shipping
*MCA 16/4 token ring cards - long and short - $5 each or 3 for $10 (plus
shipping)
*MCA 3270 adapters BNC type - long and short - 5 for $10 plus shipping
*Cases for many IBM machines, power suppiles, etc. drop a note with your
needs
Many other parts, cards and items for IBM and other brand machines.
Discounts may apply to multiple purchases, mixed or same. Please
inquire.
Shipping is generally by USPS parcel post but UPS may be used upon
request. Payment by cashier's check or money order, no personal checks
please. COD only with prior approval and incurs additionl COD charges.
Info on each model's specs and pictures can be obtained at
http://members.tripod.com/~ps2page/
--------------------------------------------------------------------
Russ Blakeman
RB Custom Services / Rt. 1 Box 62E / Harned, KY USA 40144
Phone: (502) 756-1749 Data/Fax:(502) 756-6991
Email: rhblake(a)bbtel.com or rhblake(a)bigfoot.com
Website: http://members.tripod.com/~RHBLAKE/
ICQ UIN #1714857
AOL Instant Messenger "RHBLAKEMAN"
* Parts/Service/Upgrades and more for MOST Computers*
--------------------------------------------------------------------
Hello, all:
Another crazy project...
While working on my old-DOS decompilation project, I've found that it
would be handy to have some sort of ICE hardware/software to watch the
boot-up sequence, examine specific registers, test code fragments, etc.,
without crashing my PeeCee. I've been using Debug and testing code fragments
to watch changes in the registers.
Can anyone point me to a GNU/shareware software-based ICE program, much
like NuMega's Soft-ICE Windows, that can do this for DOS? Is it even
possible to use a software-based ICE in this instance (because it's before
DOS boots).
How about this...how about a virtual PC running under OS/2 or Windows
NT? It would have to be re-bootable (without crashing the host operating
system) and support hot-key break-to-debugger. Sort of like a cross between
the vMac Macintosh emulator and WDEB386 (the Windows Kernel debugger). It
would be odd to emulate an 8088 on a Pentium 233MMX...hmmm...sounds like a
project.
Any thoughts???
Rich Cini/WUGNET <nospam_rcini(a)msn.com>
- ClubWin/CW6
- MCP Windows 95/Windows Networking
- Preserver of "classic" computers
<<<< ========== reply separator ========== >>>>>
>I am not sure why classic networking stuff tends to be shunned like a
>rabid dog. Stuff from the 1970s is quite rare, but 1980s era stuff (CSUs,
>switches, etc.) tends to be around, and now quite available, now that T1s
>are becoming turtle highways. How about running a T1 line between the
>house and garage? With appropriate routing, its performance can be quite
>suprising.
>
>Does anyone on this list have any classic networking stuff beyond
>ethernet/token thing cards?
I'm not sure anything beyond ethernet would strictly be considered
'classic', but I have a set of DS5000/200s connected via FDDI.
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry zk3.dec.com |
| Unix Support Engineering Group | (home): mbg world.std.com |
| Compaq Computer Corporation | addresses need '@' in place of ' ' |
| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
| (603) 884 1055 | required." - mbg |
+--------------------------------+-------------------------------------+
