Maximum number of PCI-6602 cards in 1 computer?

[jbelliott]

Is it possible to have 4 PCI-6602 cards in 1 computer?

Are there any DMA channels or IRQ limitations we need
to worry about?

Our computer will have 1 graphics card in the AGP slot,
possibly a PCI NIC ethernet card and possibly a PCI
based sound card. It will also have an IDE controller
with 2 hard drives and 1 CDRW.

The PCI-6602 manual seems to imply that if you are
using more than 3 counter channels that you must
use the slower Interrupt based transfer mode which
has a maximum transfer rate specified as 2000
Reading/second. If there are 4 PCI-6602 boards in
the same computer and all 8 of the channels are
used on each board does that mean the total
transfer rate is still 2000 Readings/sec? Or
wo
uld the total transfer rate be 8000 Readings/Sec
since there are 4 PCI-6602's (2000 Readings/Sec
for each of the 4 PCI-6602's)?

[Filipe A.]

Hello;

The only concern you need to have is the number of IRQs available. As far as DMA channels, as the PCI bus itself has only 3 DMA channels available, all the devices that use DMA will share those 3 channels. But, as IRQs can't be shared, the number of counters you will be able to use will be the exact number of available IRQs you still have on your machine.
As far as transfer rate, the maximum transfer rate will be 2000 Readings/sec, regardless the number of counters you are using.
Hope this helps.
Filipe