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The VCC4PRO driver automatically handles multiple boards for
the system, depending on the driver version. The standard driver
will support 4 boards but drivers for more than 4 boards are also
available.
If RGB output is required on any channel of an individual system,
the entire system must be assembled with ReelTime 4 boards. The
video output type of each channel may be selected accordingly. For
more information see "VideoTypes" on page 25.
Visual Circuits decoder cards may share interrupts with each other.
It is also possible for the cards to share interrupts with other PCI
devices in the bus, such as a SCSI card. You will have to test to
see which ReelTime 4 board is assigned by the BIOS to be 'first.'
Normally, the card on the left (looking at motherboard from
behind) is card 0. The order then will always the same each time
the PC boots, unless a device is added or removed.
Each 4-ReelTime board requests and then receives data over the
PCI bus at a fixed rate of 5.5 megabytes per second. With multiple
boards in a system, the 5.5-megabyte transfer rate for each board
can essentially be performed in parallel with the other boards.
Tuning the system involves managing the buffers in the multiple
channels. As the decoder drains the data from the channel buffer
on the card, the driver must detect which channel is requires the
most data.
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