larry@nstar.UUCP (Larry Snyder) (04/09/90)
In article <3714@thebes.Thalatta.COM>, campbell@Thalatta.COM (Bill Campbell) writes: > I don't remember the part number of the later uart chips, but replacing > your COM1 board is probably your only alternative to get as high as > 9600 on COM1. 16550A - but the driver needs to support the FIFO buffer in the chip in order to do much good. When I was running SCO Xenix (2.3.2) '386 with a dumb 8 port Comtrol Hostess board - I had 4 high speed modems running full bang (1600 cps on the HST modems, 1400 on the PEP and 940 cps on the V-Series) without *ANY* problems other than the loading - but the modems could keep up without problems. Under Unix (386/ix) with their supplied drivers (even the X5 upgraded one) I could barely keep one modem running at 2400 baud without loosing characters. My solution - smartcards (that's a whole story in itself). Currently I am running with a Computone Intelliport smartcard with a 80186 processor to handle the IO. I now have the same throughput under 386/ix that I did using the dumb card under Xenix - except the system isn't overloaded - as a matter of fact - with all 4 modems going full blast - response is such that you can't even tell the serial lines are in use. -- ...!iuvax!ndmath!nstar!larry -or- larry@nstar
larry@nstar.UUCP (Larry Snyder) (04/13/90)
> Not necessarily; the 16550AFN will use it's buffers regardless (ie. it > won't loose characters), though the interrupt overhead won't be > reduced unless the software explicitly uses the FIFOs - particularly > the transmitter. The FASY drivers are drop in replacements for the 386/ix drivers and work excellent with 16550AFN chips. The latest version is available here on nstar. > Agreed, but they're very expensive. not really - I am currently running with a Computone Intelliport - and I must admit it took a couple of months to get the correct drivers working with one of the 3 sets of proms they mailed me - but for around $500 6 smart ports that can products 1650 cps without any kind of load on the CPU isn't bad.. -- ...!iuvax!ndmath!nstar!larry -or- larry@nstar