mark@umcp-cs.UUCP (Mark Weiser) (02/19/86)
I have recently been introduced to the conceptual beauty of bus couplers.
These are little animals which hang between two separate buses and pass
relevant addresses back and forth (optionally remapping those addresses).
Kind of like network gateways (to use an analogy I'm more familiar with).
I understand more or less how to build one of these for a pair of vmebuses
(or vmxbuses) but wonder if there are commercially available versions, or
chips to help? Thanks.
-mark
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Spoken: Mark Weiser ARPA: mark@maryland Phone: +1-301-454-7817
CSNet: mark@umcp-cs UUCP: {seismo,allegra}!umcp-cs!mark
USPS: Computer Science Dept., University of Maryland, College Park, MD 20742
--
Spoken: Mark Weiser ARPA: mark@maryland Phone: +1-301-454-7817
CSNet: mark@umcp-cs UUCP: {seismo,allegra}!umcp-cs!mark
USPS: Computer Science Dept., University of Maryland, College Park, MD 20742stern@tilt.FUN (02/21/86)
You can get VME Bus Extenders (or couplers, whatever you call them) from
two places that I know of:
HVE Hal-Versa Engineering
1684 Dell Avenue
Campbell CA 95008
408 370-4666
VME Microsystems International Corp
12021 N South Memorial Parkway
Huntsville, AL 35803
205 880-0444
We have ordered two extenders from VME Microsystems. They cost
about $1,200 each; this price includes a master card, a slave card, and
three 96-pin 5 foot cables. The slave card goes into the bus where
your main master is (ie, CPU) and the master card goes into a satellite
slave bus. The only real restriction is that the satellite bus can
only have slave devices on it. The VME Repeat Link from VMIC is
a full A32:D32 device, unlike the extender from HVE Engineering, which
drops a few bits (8, if I remember correctly).
--Hal Stern
Princeton University
{ihnp4, seismo, allegra}!princeton!stern