B-1
B
Keithley Memory Manager
The process that Windows uses to allocate memory can limit the amount
of memory available to Keithley DAS products operating in Windows
Enhanced mode. To reserve a memory heap that is adequate for the needs
of your product, you can use the Keithley Memory Manager (KMM),
included in the ASO software package.
The reserved memory heap is part of the total physical memory available
in your system. When you start up Windows, the KMM reserves the
memory heap. Then, whenever your application program requests
memory, the memory buffer is allocated from the reserved memory heap
instead of from the Windows global heap. The KMM is DAS product
independent and can be used by multiple Keithley DAS Windows
application programs simultaneously.
Note:
The memory allocated with the KMM can be used by a DMA
controller, if applicable.
The following are supplied with the KMM:
●
VDMAD.386
- Customized version of Microsoft’s Virtual DMA
Driver. This file consists of a copy of Microsoft’s Virtual DMA Driver
and a group of functions that is added to perform the KMM functions.
When you use the KMM to reserve a memory heap, Microsoft’s
Virtual DMA Driver is replaced by the VDMAD.386 file.
Note:
If you have multiple versions of VDMAD.386, it is
recommended that you install the latest version; to determine which
version is the latest version, refer to the time stamp of the file.
Summary of Contents for DAS-4300 Series
Page 1: ...DAS 4300 Series U S E R S G U I D E...
Page 2: ...DAS 4300 Series User s Guide Revision A June 1995 Part Number 94520...
Page 21: ...2 6 Functional Description Figure 2 2 Host Computer Memory Address Space...
Page 90: ...C 9 Figure C 16 0 125 V Input Range Gain Code 15 0 125 V Input Range Gain Code 15...