vandys@hpindda.HP.COM (Andy Valencia) (05/31/88)
I tried to return mail this, but your att site wasn't known by our mail hub. I hope you'll forgive my posting of this mail, but it seems like an interesting question: what exactly *is* good? Andy >SCO does very, very poorly in servicing tty interrupts, due to the >horrible iAEC-286 chip. > >You can, however, improve the throughput by installing a "smart" >serial board. With a smart board, you can get reasonable serial >throughput, because you no longer have to rely on the `286 to service >the interrupt. > > Dr. T. Andrews, Systems > CompuData, Inc. DeLand For some definition of "poorly". We've run three 9600 baud TTY lines full-out into the box (yes, that's incoming characters every 300 microseconds or so) without lost characters. When we went to an eight port Arnet box we, of course, could do even more. But three of'em without a hitch seems better than "poor" to me. Not as good as RSTS/E on an 11/70, maybe, but we're talking $2000 worth of hardware here! Andy Valencia
rob@dhw68k.cts.com (Robert Kenyon) (06/12/88)
Real life install:
18 9600 baud Dumb Serial ports on a 7.16M 286.
No lost characters. Beleive me, these people would find them.
Rob
--
I once was here but now I'm not. And no one's gonna pin it on me...
Robert Kenyon - {trwrb,hplabs}!felix!dhw68k!rob - InterNet: rob@dhw68k.cts.com