On October 9, John Allain wrote:
> > a 747 was packed with DLTs and flown from
> > San Francisco to Seattle.
>
> Such a transport could easily easily exceed 1,024 TeraBytes.
> (forgot the Prefixname) What'd they need all that data for?
PORN!!
Ahem, sorry, I just couldn't resist. :)
-Dave
--
Dave McGuire
Laurel, MD
>4) Any other interesting topologies I should try? I have plans to do:
>Arcnet, FDDI, Token ring, Localtalk, 10b2, 10b5, 10bT, 10bTX, 10bFiber, and
>(eventually) 802.11b wireless.
If you decide to do TokenRing, and need some cards... let me know... I
have 3 box loads of them up for grabs (just pay shipping). I have ISA,
Microchannel, and I think I might have had a PCI in there somewhere. I
already got rid of the EISA ones. Oh, and I might have an HP Jetdirect
card for TokenRing. Sorry, I have no hubs (they used hubs of a sort
right?) or cables.
And you forgot to list on your list of topologies SneakerNet, unless you
never run anything around your house by foot.
-chris
<http://www.mythtech.net>
ard(a)p850ug1.demon.co.uk wrote:
>But seriously, the advantage of paper manuals is that you can read
them
>anywhere (like in bed, on the train, etc) , you can have them open
on
>your workbench (where there certainly isn't room for a PC in my
case),
>you can write notes all over them, etc. And I find them a lot
easier to
>read...
All very true and I completely agree. I too
generally prefer paper manuals. I would
also hate to read a manual on-screen
cover to cover (i.e. for anything other than
reference). However, my space is restricted.
I could have maybe 300 manuals within easy
reach here. I have a wall-mounted CD rack
with space for 300 CDs just feet away.
>>
>> I don't expect to read my manual on the Rainbow that I
>> am repairing ... that's what the PC or laptop
>Need any hints? I've got a fair idea as to what goes on inside the
'bow
>(pinouts, theory, etc). Some of it is not obvious (like the disk
>controller test which feeds the output of the serial chip in sync
mode to
>the read data pin of the FDC to check that the latter can decode
data
>correctly).
I have the tech manuals but this is the
PSU (second one which I've had die on me!)
The first one turned out to be the bridge
rectifier ... I found a suitable replacement
and bingo it came back to life. Only a few
weeks later I found somewhere that sold
security bits online, one of which fits
the Rainbow PSU - so at least this time
I won't be sawing a slow in the screw to
get at the thing! This time whatever
died has taken out more of the downstream
stuff. I've not had too much time to look
at it - you don't happen to have the PSU
schematics do you? ... I've got
everything else (I think) except that.
>I've never quite understood this... 20-30 years ago, most computers
used
>standard chips. And thus they could be copied (I am not talking
about
>legality here). But the schematics existed. Manuals explaining the
>schematics existed.
In DEC, I was told that they stopped supplying
them when they noticed that customers did not
want them any more (and obviously these things -
especially technical manuals) cost mucho
denaro to produce ... schematics must already
exist obviously! This was when the customer
base moved from being propeller-heads to
suits.
>Now we have ASICs which are much harder to copy, and yet the docs
don't
>exist...
>
>Anyway, any half-decent hacker can reverse-engineer most devices in
a
>couple of days at most....
The board for which I am currently scribbling
software has a few standard, identifiable chips
on it but the interconnections are mostly
mediated by a few large FPGAs. There are
also some custom ASICs in there too.
The memory map is entirely decided
by the FPGA. Adding and removing
caps resistors and other SMT components
is not too bad but playing with one of the
750-plus pin BGA devices is probably
beyond the realm of the hobbyist (although
re-work houses do exist, so who knows?)
>> my current TV came with a five year guarantee and the
>> previous one was a Decca series 80 chassis that was already
>I probably have that schematic somewhere... I've got a lot of
volumes of
>Poole+Molloy (and its successors) on the shelf.
For the record, it's a Philips 21PT5322 and the
other one is a Fergusson T14R. (The latter
is now out of guarantee and is therfore
"fair game" ... ).
Antonio
On October 9, Mark Tapley wrote:
> going to college in about 10 years, so I gotta earn tuition, and then
> there's paying for the classic computer shed that the wife insists on
> filling with "nice furniture" and "decorating" because she thinks of it as
> a "house"....)
I added a decoration a while back. It's a VAX4000-700a. Gorgeous.
Functional, too.
-Dave
--
Dave McGuire
Laurel, MD
> Chris [SMTP:mythtech@Mac.com] wrote:
>
>I wasn't that lucky... when I did it, I shorted a cap thru my
finger
>(fortuantly, just thru ONE finger, tip to knuckle). I was working
blind
You don't need HV - large currents can be nasty too.
The PSUs in some of the VAX 6000/7000 platforms
are only +5V but can dump 100s of amps. You
probably don't want to short one of those with
your ring finger!
Now for real HV - I was told by an ex-electrical
engineer - that he watched while someone
was measuring up for a new HV cabinet with
a tape measure. The usual metal sort you or I
might use for DIY. He dropped it and shorted
out the busbars, instantly melted the tape
and ended up in hospital with major burns
across his arms and chest.
Having been hit a few times by mains (240V)
voltage, I've learned to be more careful and
switch stuff off!
Antonio
Among quite a bit of other wisdom, Tony wrote:
>Heck, all I want are things like pinouts....
Ah, the pot 'o gold at the end of the rainbow!
A skilled repairman, who works for pinouts....
:-)
More seriously, while I aspire to fix things like Tony, I find that
ignorance and lack of time are powerful disincentives. (The little one
needs his diapers (nappies?) changed, and the bigger little one is gonna be
going to college in about 10 years, so I gotta earn tuition, and then
there's paying for the classic computer shed that the wife insists on
filling with "nice furniture" and "decorating" because she thinks of it as
a "house"....)
I can swap modules. When I click the switch and nothing at all
happens, and I have a new power supply on hand .... it's within my limited
time and knowledge horizons to swap 'em. Getting an o-scope, learning how
to use it, taking apart the power supply (and trusting that the little one
won't ingest some of the nuts and washers while the medium-size one is
getting a talking-to about sliding down the bannister with the power cord
in tow).... well, that may be without my horizons.
All this ranting leads to my question, to the group as a whole and
Tony in particular:
Is there a way I tell that it'll be safe to board-swap? In other words, are
there symptoms I can in general use to tell me that the fault that caused
damage was on the damaged (e.g.) board, and that therefore, if I have
another example of that board, I won't fry it too by putting it into the
place of the damaged one?
- Mark
> In light of such, I have a series of questions:
>
> 1) Who knows some stuff about ArcNet? I've gotten 4 cards (8-bit ISA) and
a
> 16-port active hub. I've read somewhere that cards are either hubbable or
> not. Any other info on that?
I've never used an active hub before... and was thus limited to 4 nodes
using my home-made passive hub.
> 2) Anyone have any (I think it is) 93ohm coax arcnet patch cables that they
> want to get rid of?
I think you'll have trouble if you use anything other than 63 ohm coax...
...
Formerly, the support for ARCNET in Linux was pretty week. However, there was
an ARCNET/LINUX mailing list for a long time, and the members were keeping the
driver sources up-to-date. The name of the list owner (or the guy cranking out
the code) was, first name, Avery, last name, Pennimum or something unusal.
hth,
-doug quebbeman
> Paul Thompson wrote:
>I think multinet supports DHCP. I am not familiar enough with
TCPIP
>services for VMS (UCX), however. Multinet has a hobby program.
>On 9 Oct 2001, Iggy Drougge wrote:
>> Now that I've got "broadband", I'd like to see my VAXstation on
the net. It's
>> running VMS 5.1 and UCX, but does it have any DHCP capabilities?
>> It's not a great problem, but if there is some option for getting
config info
>> via DHCP, it'd save me the trouble of setting up a NetBSD
environment in order
>> to run dhclient. =)
I believe that the latest UCX (TCPIP as it is
now called) does support DHCP. The manuals
should be around somewhere under
http://www.openvms.compaq.com
Antonio
(reply at end...)
! On Tue, 9 Oct 2001, Tarsi wrote:
! > Dear all,
! >
! > I've decided that one of my goals is to run every
! > networking topology possible in my house, regardless
! > if I actually NEED to run them or not. :)...
.....
! > I currently have running 10bT ethernet, 10b2 ethernet,
! > Localtalk over PhoneNET and the beginnings of Arcnet.
! >
! > In light of such,...
.....
! > 4) Any other interesting topologies I should try? I have
! > plans to do:
! > Arcnet, FDDI, Token ring, Localtalk, 10b2, 10b5, 10bT,
! > 10bTX, 10bFiber, and (eventually) 802.11b wireless.
! >
! > Thanks folks!
! -----Original Message-----
! From: Absurdly Obtuse [mailto:vance@ikickass.org]
!
! FDDI would definitely be a good one to do. It uses dual
! counter-rotating rings. How about ATM? HIPPI? CI?
! CHANNEL-CHANNEL?
...And someone asked if _I_ was masochistic when I only asked about
upgrading a 486!
--- David A Woyciesjes
--- C & IS Support Specialist
--- Yale University Press
--- mailto:david.woyciesjes@yale.edu
--- (203) 432-0953
--- ICQ # - 905818
