Dma Mapping; Memory Map - Xycom AHIP-370 Manual

DMA Mapping

DMA
DMA0
DMA1
DMA2
DMA3
DMA5
DMA6
DMA7
DMA channels 0-3 are 8-bit and DMA channels 5-7 are 16-bit. When the ECP option
is enabled, one of the 8-bit DMA channels is used.

Memory Map

The following table shows the AHIP-370 memory map. The I/O designation refers to
memory viewed as part of the AT bus.
Address Range (HEX)
FFFE0000 - FFFFFFFF
end of DRAM - FFFDFFFF
00100000 - end of DRAM
000F0000 - 000FFFFF
000E0000 - 000EFFFF
000D0000 - 000DFFFF
000C0000 - 000CBFFF
000A0000 - 000BFFFF
00000000 - 0009FFFF
*See Intel 430BX data sheet for a description of optional settings for assigning
memory holes or gaps within memory map area.
Table 2-4. DMA Channels
Function
Unused (Could be used for EPP/ECP parallel port option)
Unused
Floppy Controller
Unused (Could be used for EPP/ECP parallel port option)
Unused
Unused
Unused
Size
128K
xxxK
xxxK
64K
64K
64K
48K
128K
640K
Table 2- 5. Memory Map
Device
SYSTEM BIOS
I/O Memory
DRAM*
SYSTEM BIOS
SYSTEM BIOS
AT bus I/O
VGA BIOS
VGA DRAM MEMORY
DRAM
Chapter Two - Installation
17