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Memory Map
The lower 1 MB memory map of the VL-EPM-24 is arranged as shown in the following table.
Various blocks of memory space between A0000h and FFFFFh are shadowed.
I/O Map
The following table lists the common I/O devices in the VL-EPM-24 I/O map. User I/O devices
should be added using care to avoid the devices already in the map as shown in the following
table.
Note:
The I/O port traffic is always present on the LPC bus and care must be taken to
avoid conflicts among on-board devices and expansion modules.
VL-EPM-24 Reference Manual
System Resources and Maps
Table 17: Memory Map
Start
End
Address
Address
F0000h
FFFFFh
E0000h
EFFFFh
C0000h
DFFFFh
A0000h
BFFFFh
00000h
9FFFFh
Table 18: On-Board I/O Devices
I/O Device
PLED and Product ID Register
Revision and Type ID Register
Video BIOS and GPI Register
WDT and HWM Register
ISA Block Enable Registers
SPX Registers
ISA IRQ Enable Registers
Primary Hard Drive Controller
COM4 Serial Port Default
COM3 Serial Port Default
COM2 Serial Port Default
COM1 Serial Port Default
Comment
System BIOS Area
Extended System BIOS Area
Expansion Area
Legacy Video Area
Legacy System Area
Standard
I/O
Addresses
1D0h
1D1h
1D2h
1D3h
1D4h – 1D5h
1D8h – 1DDh
1DEh – 1DFh
1F0h – 1F7h
2E8h – 2EFh
3E8h – 3EFh
2F8h –2FFh
3F8h – 3FFh
6 6
43
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