luce@aurs01.UUCP (J. Luce) (04/03/91)
A quick question... would an 8 Mhz. 286 - AT clone with an 8250/16450 that is *NOT* multitasking and whose only task would be Zmodeming (or some such protocol) drop characters and need the 16550? Or is that scenario for slower machines or machines that are multi-tasking. In other words, do I *need* this chip for reliable data transfers under the above scenario?? Thanks.
tnixon@hayes.uucp (04/03/91)
In article <59698@aurs01.UUCP>, luce@aurs01.UUCP (J. Luce) writes: > A quick question... would an 8 Mhz. 286 - AT clone with an 8250/16450 > that is *NOT* multitasking and whose only task would be Zmodeming (or > some such protocol) drop characters and need the 16550? Or is that > scenario for slower machines or machines that are multi-tasking. > > In other words, do I *need* this chip for reliable data transfers under > the above scenario?? I have exactly that configuration here on my desk (straight MS-DOS PC AT, 8 MHz, 16450), and run it at 19200 and even 38400 all the time, and never see data loss -- except when I try to access the RAMdisk in extended memory (which disables interrupts for a while). So long as I stay away from the RAMdisk while receiving, I never lose data. I think the software you run has a lot to do with it; Smartcom III and Smartcom Exec are pretty fast, and I'm sure there are several other programs that can keep up with 19200 or 38400 on an 8 MHz 80286. -- Toby Nixon, Principal Engineer | Voice +1-404-840-9200 Telex 151243420 Hayes Microcomputer Products Inc. | Fax +1-404-447-0178 CIS 70271,404 P.O. Box 105203 | UUCP uunet!hayes!tnixon AT&T !tnixon Atlanta, Georgia 30348 USA | Internet hayes!tnixon@uunet.uu.net
luce@aurs01.UUCP (J. Luce) (04/03/91)
In article <59698@aurs01.UUCP> luce@aurw46.UUCP (J. Luce) writes:
-A quick question... would an 8 Mhz. 286 - AT clone with an 8250/16450
-that is *NOT* multitasking and whose only task would be Zmodeming (or
-some such protocol) drop characters and need the 16550? Or is that
-scenario for slower machines or machines that are multi-tasking.
-
-In other words, do I *need* this chip for reliable data transfers under
-the above scenario??
-
-Thanks.
-
Of course, I forgot 1 piece of information: I am talking about running
this with a USRobotics Dual Standard, locking the ort at 19.2/38.4..root@zswamp.fidonet.org (Geoffrey Welsh) (04/08/91)
J. Luce (luce@aurs01.UUCP ) wrote: >A quick question... would an 8 Mhz. 286 - AT clone with an >8250/16450 >that is *NOT* multitasking and whose only task would be >Zmodeming (or >some such protocol) drop characters and need the 16550? Or >is that >scenario for slower machines or machines that are >multi-tasking. >In other words, do I *need* this chip for reliable data >transfers under the above scenario?? I hate to be vague, but the only answer that I'm willing to guarantee is "That depends..." For instance, you didn't specify what baud rate. I don't expect trouble at 9600 or 19,200 bps, but 38,400 bps is questionable. Also, all bets are off if you're using a Perstor ARLL controller card for your hard drive; they'll screw *anything* up. <grin> -- UUCP: watmath!xenitec!zswamp!root | 602-66 Mooregate Crescent Internet: root@zswamp.fidonet.org | Kitchener, Ontario FidoNet: SYSOP, 1:221/171 | N2M 5E6 CANADA Data: (519) 742-8939 | (519) 741-9553 The mile is traversed not by a single leap, but by a procession of coherent steps; those who insist on making the trip in a single element will be failing long after you and I have discovered new worlds. -- me