Re[2]: emc on microway alpha pc?

["Terry L. Ridder" <terrylr-at-blauedonau.com>]

On Thu, 12 Oct 2000, Jon Elson wrote:


"Terry L. Ridder" wrote:
 
terrylr> hello;
terrylr>
terrylr> this would be the test box for the bridgeport
terrylr> boss conversion. the bridgeports all have steppers.
terrylr> i am going to drive the bridgeport with two
terrylr> parallel ports. i need to order some of the least
terrylr> expensive isa cards.

jon> 
jon> You should know that the ISA bus is a HUGE bottleneck, and
jon> getting worse as CPUs get faster.  You might do well to at
jon> least have the stepper motors on a PCI parallel port.
jon> The auxilliary stuff should be OK on the ISA.
jon> 

now i have two people tell me two opposing points-of-view.
one person is saying isa should be fine and the other is
saying that isa parallel cards would be a bottleneck.

a dual parallel port pci card must share an irq.
to allow for individual irqs i would need to single
parallel port pci cards.

for now isa cards are the choice since the budget is tight.
pci parallel cards may come later.

terrylr> in talking with matt shaver concerning intel hardware
terrylr> limiting the ability of emc to drive steppers currently
terrylr> i was thinking of trying the alpha since the hardware
terrylr> is a little different and should not be the limiting
terrylr> factor. matt, sent me an excel spreadsheet which showed
terrylr> the limits under intel hardware.
jon> 
jon> Hmmm, I'd like to see that.
jon> 

ask matt shaver for it.

<snip>

jon> 
jon> Jon
jon> 

-- 
Terry L. Ridder

digging deep, i feel my conscience burn
i need to know who and what i am
this hunger jolts me from complacency
rocks me, makes me meet myself
----kendall payne---closer to myself---