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DMA Controller
Direct memory access (DMA) improves system performance by
allowing devices to access the system
provided by two 82C37 -compatible direct
(DMACs) contained in the 82357. The seven independent 32-bit DMA
channels are listed in the table below along with their associated
DMA controller and their device assignments.
DMA request level
Hardware interrupt (IRQ) map
EISA Series Computers
memory directly. This ability is
memory access controllers
System Memory Map
Use of the
memory areas for
l
depends upon the type of video adapter card installed.
1/92
EISA Series Desktop
Not accessible
video memory and the video BIOS
Desktop-5