Messages in this thread | | | Subject | Re: ISA-Bus load? | From | Matti E Aarnio <> | Date | Wed, 3 Jul 1996 16:36:36 +0300 (EET DST) |
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> I am wondering if there is a chance to get an idea of what is > happening on the PC's ISA-Bus from a programmer's view. > I have a couple of add-on cards providing my software with > datastreams from the real world, data rates less than 500kbit/s - I > would like to plug in as many of them as possible. > All I would like to find out is where the limit is. The idea > of just trying it out is probably less than semi-optimal - who knows > how good may way of communicating with the hardware is? > > I was hoping to find anything in the /proc-fs - in vain it seems. > There must be something in the kernel... > Thanks for any hints!!
With the ISA-bus you can do about 2 million memory or io-cycles per second (depending on your bus-clock setup -- from bios setups). There is nothing the programmer can do in his/her programs -- except to avoid any extra references via the ISA-bus.
The ISA-bus is SLOW! Compare to 120 MB/s on PCI with 30 MHz burst clock, and 4 byte wide transfers..
> Volker
/Matti Aarnio <mea@utu.fi>
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