Adaptec 1740 Controller Requires Double Buffering

 Last reviewed: November 22, 1994
Article ID: Q84015
The information in this article applies to:
  • Microsoft MS-DOS operating system versions 4.x, 5.0, 6.0
  • Microsoft Windows operating system versions 3.0, 3.0a, 3.1
  • Microsoft Windows for Workgroups versions 3.1, 3.11

SUMMARY

According to Adaptec documentation, using the Adaptec 1740 controller with Windows in enhanced mode or with the EMM386.SY/EMM386.EXE device driver requires a double buffering device driver.

However, if SMARTDrive (SMARTDRV.EXE) version 4.0 from Microsoft Windows version 3.1, is installed to perform double buffering, it may not detect that double buffering is required. If you are using SMARTDrive version 4.0, you can force SMARTDrive to perform double buffering by loading it with "/DOUBLE_BUFFER+". For example: 

   device=c:\windows\smartdrv.exe /double_buffer+
If you are not using Windows 3.1, you can force SMARTDRV.SYS from MS-DOS 5.0 or Windows 3.0 to perform double buffering by loading it with "/b+". For example: 

   device=c:\dos\smartdrv.sys /b+

MORE INFORMATION

When providing double buffering, SMARTDRV.SYS cannot be loaded into upper memory blocks (UMBs).

SMARTDRV.EXE (which is SMARTDrive version 4.0, included with Windows 3.1) separates the double buffering and disk caching functions. The double buffering portion is loaded in CONFIG.SYS and must be loaded in conventional memory. The disk cache portion of SMARTDrive is loaded from the AUTOEXEC.BAT file, and can be loaded into upper memory if an upper memory block (UMB) provider such as EMM386.EXE is loaded.

For more information on double buffering, query on: 

   double buffering definition

KBCategory: kbhw kb3rdparty kbenv
KBSubcategory: winmem win30 win31 wfw wfwg msdos
Additional reference words: 3.00 3.00a 3.10 3.11 5.0 5.00 5.0a 4.00 4.01
4.01a 3rdparty

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Last reviewed: November 22, 1994
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