EPM-15 Reference Manual
39
System Resources and Maps
Memory Map
The lower 1 MB memory map of the EPM-15 is arranged as shown in the following table.
Various blocks of memory space between C0000h and FFFFFh can be shadowed. The CMOS
setup is used to enable or disable this feature.
Table 12: Memory Map
Start
Address
End
Address
Comment
E0000h FFFFFh
System BIOS
DC000h
DFFFFh
Reserved
D0000h DBFFFh
PC/104
C0000h CFFFFh
Video BIOS
A0000h BFFFFh
Video RAM
00000h 9FFFFh
System RAM
I/O Map
The following table lists the common I/O devices in the EPM-15 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.
Table 13: On-Board I/O Devices
I/O Device
Standard
I/O
Addresses
Special Control Register
1D0h
Jumper and Status Register
1D2h
RS-485/422 Tx/Rx Control Register
1DAh
Reserved 1E0h
Primary Hard Drive Controller
1F0h – 1F7h
COM4 Serial Port
2E8h – 2EFh
LPT1 Parallel Port
378h – 37Fh
COM3 Serial Port
3E8h – 3EFh
COM1 Serial Port
3F8h – 3FFh
Note:
The I/O ports occupied by on-board devices are freed up when the device is
disabled in the CMOS setup.
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