🚀 go-pugleaf

Can EISA, MicroChannel, or the new VESA LocalBus on PC's allow
multiple controllers plugged into them (say two smart bus mastering
SCSI disk controllers on one of these buses) xfer data simultaneously
to main memory (DMA)?

Here's the example: say I have two SCSI controllers on an EISA, and
an EISA based ethernet controller, can more than one of these
interfaces be doing a DMA data transfer on the bus at the same time
to main memory (say, interleaving their I/O)?  Or is it the case
for all of them (if any can do please specify) that only one
controller can be doing I/O at a time to main memory (DMA) before
anothere can?  How about if a system has an EISA and a VESA LocalBus
and there is a smart disk controller in the VESA LocalBus and an
EISA based ethernet controller on the EISA bus, can both be doing DMA
to main memory?

Thanks in advance for any input.



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Michael F. Santangelo                 + Internet: mike@cbl.umd.edu
Computer & Network Systems Director   +           mike@kavishar.umd.edu
UMCEES / CBL (Solomons Island)        + BITNET:   MIKE@UMUC