OK, next question.
I've acquired a few Asante FriendlyNet Thin Adaptors. These are little
boxes about the size and shape of old Mac transceivers -- about 4" long, 2"
wide, 1 1/4" thick. One end has an RJ45; the other has a BNC sticking out
each side:
____________________ _
| | { }
| |_|_|_
| |
| _ _ _|
| | | |
|____________________| {_}
Inside is a standard 5V-9V DC-DC converter, a standard ethernet 3-section
transformer, and a perfectly ordinary DP8392 ethernet transceiver IC and
the usual discrete components (diode, a few resistors, etc) I associate
with an ethernet coax driver. So on the face of it, it looks like a
line-powered 10baseT to 10base2 converter. Oh yes, one other thing: the
BNCs are self-terminating; they have an extra contact set into the centre
insulation (with nothing plugged in, there's 50 ohms across core and
screen; with two plugs in, it's open-circuit).
But it doesn't seem to work -- so what is it really?
If it's any clue, they came from someone who's into Apple Macs.
--
Pete Peter Turnbull
Network Manager
Dept. of Computer Science
University of York
Just saw this on comp.sys.dec. Sounds like a nice deal for someone in
switzerland:
From: Peter Mueri <MPe(a)pop.agri.ch>
Newsgroups: comp.sys.dec
Subject: FS: uVAX2000, PRO380, RD54, RZ58
Date: Fri, 24 Nov 2000 14:42:17 +0000
For cheap sale, pick-up preferred:
2 uVAX2000/VAXStation2000
1 VAXstation 3100/76,
1 DEC Professional 380 with Monitor/KB and P/OS Distro, RT11-Disk and
docu
1 VAXmate PC, various replaement parts
various DEC QBUS Cards
1 Rainbow PC with Stand
1 19" B/W DEC Monitor
various Disks (RD54 MFM, RZ58 SCSI)
Offers per Email please, details available from mpe(a)pop.agri.ch
regards
Peter, Switzerland.
--- John Honniball <John.Honniball(a)uwe.ac.uk> wrote: >
> Mine has a passive terminator board which has space for a
> UHF modulator, but the parts aren't installed.
>
Sounds familiar!
> As for the disk controller, it has a WD FD1771, a Z80 CTC
> (Counter-Timer Chip) and an 8251 serial chip. Also the
> usual glue logic and some 1488/1489 drivers.
>
AHA! It _IS_ the old card. Just what I need to start using the box. I have the newer posher one,
which we may not have software for. I still would like to get the newer card to work tho :)
Dave.
__________________________________________________
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I've just acquired a time-base corrector made by Digital Processing
Systems, model VT-1000 (the original TBC made by DPS) for use with my Video
Toaster. Unfortunately, I didn't get either a manual or the driver disk
required. I've tried various Amiga and video-related newsgroups, but to no
avail. Can any videophiles on the list help me with the following
questions:
- what are the 4 RCA jacks on the back of the card, in order from top to
bottom?
- what does the switch above the jacks do?
- has anyone got a driver disk (for Amiga DOS) they're willing to copy?
I'd happily pay shipping and a handling fee for a copy of the disk and/or
manual for this beast (made in 1990, I believe, and thus just on-topic).
Thanks!
Mark.
On Nov 23, 22:34, jeff.kaneko(a)juno.com wrote:
On Thu, 23 Nov 2000 23:54:35 GMT pete(a)dunnington.u-net.com (Pete
Turnbull) writes:
> > I've found an HP board, which has "HP 03812L" and then "98574-66513"
> > on it.
> > I think this is a part for an HP9000 system, more precisely a "68040
> > EMULATION PROCESSOR". Is this something you can plug in in place of
> > a real
> > 68040, and if so might it work in anything other than an HP9000?
> Is this thing L-Shaped? If it is, then this is the 'l-board'
> that goes into Hp 9000/375 (I have one of these sitting in my
> garage).
Yes, it is. About 7 1/2" by 8", with a 5" x 4" chunk cut out.
> Anyways, many of these were swapped out in favor of a *real*
> 68040 running at 25 or 33 Mc. HP used these boards because
> (presumably) they had their 68040 system board laid out and
> ready to go but Moto didn't quite have the silicon yet.
>
> SO they outfitted the 9000/375 with this kludge (that used a
> 68030), and the later 380's were the same hardware with the
> real processor installed, instead of the L-board.
That sounds plausible. Thanks for the info.
> I would be really curious to know if this thing functions
> as an '040 in other systems . . .
Well, if I get the chance, I'll try it. I wouldn't be too hopeful, though;
partly because it's quite large, and partly because it's been lying around
without any antistatic protection for months, and has been handled by
several people in that time.
--
Pete Peter Turnbull
Network Manager
Dept. of Computer Science
University of York
On Nov 23, 22:35, Richard Erlacher wrote:
> It's been a long time since I last put together a coax board uisng a
DP8392
> transceiver, but as I recall the 8392 needed relatively few external
> devices. Its purpose, however, was to drive the coax. I don't believe
> there's any need for it in a TP application.
Well, no, you use a different transceiver IC for that, with a differntial
output, differential input, and some capacitors for pulse-shaping.
> In the classic ethernet/thinnet board design, there was a controller,
e.g.
> AMD 7990, a modulator/demodulator, e.g. AMD 7992, often with the digital
pll
> right in it, and a coax driver like the 8392, but, in AMD's case it was
> another device with more pins and more external parts.. The
> modulator/demodulator drove the AUI outputs, OR, if jumpered
appropriately,
> drove the DP8392. The DP8392 was also the most costly of the three or
four
> popular coax drivers, (AMD, Intel, National, and SEEQ) but it was worth
it
> because of its smaller package size and need for fewer external
components.
I have a few boards (at least one ISA for a PC, and some Acorn cards) which
use the Intel controller and SEEQ. My experience (and that of some others
I've talked to) is that the Intel/SEEQ combination is much less reliable
than the AMD/National ones. It's also much harder to get the ICs for if
you need to repair one.
--
Pete Peter Turnbull
Network Manager
Dept. of Computer Science
University of York
On Nov 24, 5:48, Eric Smith wrote:
> > I've acquired a few Asante FriendlyNet Thin Adaptors. These are little
> [...]
> > So on the face of it, it looks like a
> > line-powered 10baseT to 10base2 converter.
>
> No, it's just a 10base2 transceiver with a funky connector for the AUI
> rather than a standard 15-pin D-sub. It has nothing whatsoever to do
> with 10baseT.
Thank, Eric, that's exctly the conclusion I came to in the end, but it's
nice to have it confirmed.
--
Pete Peter Turnbull
Network Manager
Dept. of Computer Science
University of York
On Nov 23, 18:07, Zane H. Healy wrote:
> Actually these just came up on comp.os.vms, of all places, a few days
ago.
> Aparently Asante just used the RJ45 to connect them to their Ethernet
card.
> While it looks like it should be a 10BaseT-to-10Base2 converter it
> apparently isn't.
Thanks, Zane. Yes, having loked at some of the connections inside, that
seems to be it.
--
Pete Peter Turnbull
Network Manager
Dept. of Computer Science
University of York
I was bored, so I was wondering if there are any VAX emulators. I found
www.charon-vax.com
which emulates a KA630. It'll install from the montagar CD on WinNT and
Win2k. It won't emulate an RRD40 on Win9x. I'm going to be running VMS on my
laptop :)
I have some ATM network cards for RS/6000 computers. 100Mbps.
If this is of value to someone, let me know what you offer in trade.
-Lawrence LeMay
lemay(a)cs.umn.edu
