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Memory and I/O Map
EPM-4 Reference Manual Reference – 37
I/O MAP
The following table lists the common I/O devices in the EPM-4 I/O map. User I/O devices should
be added in the 104h – 3FFh range, using care to avoid the devices already in the map as shown
below.
Table 9: On-Board I/O Devices
I/O Device
Standard
I/O Addresses
See ÉlanSC520 register set manual 000h-0FFh
Special Control Register 0E0h
Revision Indicator Register 0E1h
Map and Paging Control Register 0E3h
Primary IDE Controller 1F0h – 1F6h
COM 4 Serial Port 2E8h – 2EFh
COM 2 Serial Port 2F8h – 2FFh
COM 3 Serial Port 3E8h – 3EFh
Floppy Disk Controller 3F0h – 3F7h
COM1 Serial Port 3F8h – 3FFh
CBAR FFFCh-FFFFh
Note: I/O ports occupied by on-board devices are freed up when the device is disabled in
CMOS Setup.