Subject: Re: pciide, DMA, and the alpha...
To: None <>
From: None <>
List: port-alpha
Date: 08/11/1999 21:59:53
In message <>, Thor Lancelot Simon writes:
>My pc164 is running pretty much Fine with an IDE disk.  In fact, it boots
>from it.  No problems so far.  The CMD0646 controller onboard the pc164
>doesn't do Ultra-DMA, though -- it doesn't really matter, since the UDMA
>disks step down to the "plain old" DMA modes.  Somewhat more CPU 
>utilization, and you lose the CRC over the data that UDMA does, but it 
>works and it's a lot better than PIO.

So, if I wanted "good" performance, I'd probably put in a newer UDMA
controller, but it might work well enough.

I'm booting from EIDE right now because I don't have exactly-the-right
SCSI controller.

>You don't "run out of" interrupts on anything with a PCI bus, you can 
>share one interrupt between as many devices as you like.  Some ancient PC
>hardware can't cope with this (and even some modern Windows device
>drivers can't!) but it's broken.

Oh, okay.  I just know that I see too many weird problems on "modern" hardware
even.  *sigh*.