> *FWIW a lot of the passive backplane systems use cards with an extra
> connector similar to the old VLB cards. They call it PICMIG. I don't know
> the details of it.
It's the PCI extension.
PICMIG = PCI Industrial Computer Manufacturers Group
a consortium of over 500 individual industrial computer product vendors
established
in 1994. Its' mission is to extend the PCI standard, as approved by the PCI
Special
Interest Group (PCI SIG), for computer systems such as passive backplane
PCI/ISA
and the CompactPCI Eurocard form factor.
http://www.trentonprocessors.com/support/picmg.html
At 05:20 PM 9/30/03 -0400, you wrote:
>At 02:12 PM 9/30/03 +0200, you wrote:
> >On Mon, Sep 29, 2003 at 04:11:45PM -0400, Joe wrote:
> >> >> what 'passive backplane' should do?
> >>
> >> There's no active components on the "backplane". OK there mayu be a few
> >> LEDs of something to show presense of power but no vital components vital
> >> to the system. The S-100 backplanes are a good example. The CPU, system
> >> memory, video circuits, I/O ports etc are all on plug in cards.
> >
> >ok, but can i safely assume that connector between this board
> >and backplane is a normal ISA bus and stick it into a strange ISA...
>
> Yes you can assume that it's a standard ISA connector if it looks ike
>one. There are some cards that have an extra connector but those will be
>obvious.* BUT even if it has a standard ISA connector you can not just plug
>it into a standard motherboard that already has CPU and memory. If you do,
>you will be connecting the outputs of the memory, CPU etc on one board to
>the outputs of memory, CPU etc of the other board. If any of the outputs
>are not in the same logic state (hi or Lo), and it's a near certainty that
>they're not, then they will try to force the other outputs and WILL burn up
>something. I didn't see the first part of this thread so I don't know the
>details of the card that you have. If it's a CPU or memory card, don't try
>to use it in a computer with a motherboard! If it's an I/O card then it's
>probably safe to use with a motherboard.
>
>
> >hm, splitter? (don't know the proper word, it has one male ISA edge
> >connector, two female ISA sockets and three decoupling capacitors)
> >with wires from PSU connected to the proper bus pins?
>
> In the PC industry those are usually called riser cards. They plug into
>the motherboard and stick up and you can plug several standard PC cards
>into them. The PC cards will then lay parallel to the motherboard instead
>of perpendicular as in the orginal PCs. That style system is called NTX.
>
> But to answer your question, yes you can make you own passive backplane
>using a riser card. Some backplanes have the keyboard and reset signals
>routed through them but most of the CPU cards for those systems can get the
>keyboard signals via the backplane or through some kind of wiring adapater
>that runs directly from the CPU card to the keyboard port in the case.
>
> BTW where are you located? I have some extra backplanes here (Florida).
>I can probably send you one.
>
> *FWIW a lot of the passive backplane systems use cards with an extra
>connector similar to the old VLB cards. They call it PICMIG. I don't know
>the details of it.
>
> Joe
>
> >
> >
Received on Tue Sep 30 2003 - 19:25:27 BST