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- MULTITASKING AND TELECOMMUNICATIONS
- On-Line Version
- Last Revised: March 25, 1993
-
- Supra Corporation - World Headquarters
- 7101 Supra Drive SW, Albany, OR 97321
-
- General: (503) 967-2400
- Fax: (503) 967-2401
- Sales: 7:00am - 5:00pm PST, M-F
- (503) 967-2410
- (800) 727-8772
- Supra Tech Support: 8:00am - 4:30pm PST, M-F
- (503) 967-2440 GENERAL
- (503) 967-2490 IBM DOS & Other Products
- (503) 967-2491 IBM WINDOWs
- (503) 967-2492 MAC
- (503) 967-2493 AMIGA
-
- Supra BBS........(503) 967-2444 8 lines 24 Hours v.32bis v.42bis LAPM 2-5
-
- CompuServe.......76004,565
- BIX..............SupraCorp
- America Online...SupraCorp2
- GEnie............SupraTech
- AppleLink........D2456
- UseNet EMail.....supratech@supra.com
-
- ------------------------- (Article Begins Here) -------------------------
-
- Multitasking computers allow you to do many different things while other
- operations take place in the background. Although you don't see them in
- progress, background operations can be complex and can sometimes demand too
- much of your computer's attention to allow high-speed communications. High-
- speed transmissions are more reliable in a single-user situation with as few
- applications as possible in use. This section lists some specifics which can
- interfere with high-speed communications, depending on your platform.
-
- Amiga
-
- Workbench 2.x allows transmission rates about 100% faster than Workbench 1.3, which limits you to 9600 bps reliably. Background tasks, graphics modes,
- SCSI interfaces and hard drives all can have an impact on the actual
- transmission rate. With WB 2.x, you should be able to achieve reliable serial
- port speeds between 9600 and 19,200 bps, depending on CPU model and speed.
- The SupraTurbo 28 accelelerator also helps alleviate this problem.
-
- Macintosh
-
- AppleTalk/AppleShare activity (including printing) can lower the transmission
- rate because this activity has a higher priority than other serial
- communications. Some INITs and CDEVs may also cause problems.
-
- PCs & Compatibles
-
- Please also see the "Faster UART Chip" section in the SupraFAXModem V.32bis
- Important Information manual. TSR (terminate and stay-resident) programs can
- also slow the transmission rate. For throughput over 19,200 bps, your computer
- should have a 386 or faster processor. Multitasking performance varies between operating systems:
-
- Windows 3.0 will often have problems at serial port speeds (computer
- rates) higher than 9600 bps.
-
- Windows 3.1 correctly supports up to 38,400 bps with a 16550 UART.
-
- Windows NT and OS/2 have no problems with multitasking.
-
- All Platforms - Displays
-
- If you are downloading text that is displayed on your screen as it is
- received, you may have problems with your computer's display keeping up with
- the speed of the incoming data. One way to get better performance is to
- change your display to a lower number of colors, or monochrome, so it is more
- efficient.
-
- All Platforms - Processor Speed
-
- Another general rule is the faster processor that your machine has, the better
- it will be for high-speed transfers. A 68030 or 386/486 machine will probably
- do better than a 68000 or 80286.
-
- -------------------------- (Article Ends Here) --------------------------
-
- Copyright 1993 Supra Corporation
-
- Supra Corporation, and SupraModem are registered trademarks of Supra
- Corporation.
-
- SupraFAXModem, SupraSmartUART, SupraTurbo, and Silent Answer are trade-
- marks of Supra Corporation.