Hercules-EBX CPU User Manual V1.02
Page 39
6. SYSTEM FEATURES
6.1 System Resources
The table below lists the default system resources utilized by the circuits on Hercules-EBX.
Device
Address (Hex)
ISA IRQ
ISA DMA
Serial Port COM1
I/O 3F8-3FF
4
-
Serial Port COM2
I/O 2F8 – 2FF
3
-
Serial Port COM3
I/O 3E8 – 3EF
9
-
Serial Port COM4
I/O 2E8 – 2EF
N/C*
-
IDE Controller A
I/O 1F0 – 1F7
14
-
IDE Controller B
I/O 170 - 177
15
-
A/D Circuit (when applicable)
I/O 240 – 25F
5
-
Serial Port / FPGA Control
I/O A50-A5F
-
-
Ethernet OS-dependant
OS-dependant
-
USB OS-dependant
OS-dependant
-
Sound OS-dependant
OS-dependant
-
Video OS-dependant
OS-dependant
-
Table 28: System Resources
* = COM 4 is not connected to an IRQ by default. To use COM4 on the default jumper pinout,
either COM1 must be disabled/changed (for access to IRQ3) or the Secondary IDE controller
must be disabled (for access to IRQ15). Alternatively another IRQ may be used, but a wire would
be required : COM4 only jumpers directly to either IRQ15 or IRQ3.
Note that most of these resources are configurable and, in many cases, the Operating System will
alter these settings. The main devices that are subject to this dynamic configuration are on-board
Ethernet, sound, video, USB, and any PC/104+ cards that are in the system. These settings may
also vary depending on what other devices are present in the system : Adding a PC/104+ card
may cause the on-board Ethernet resources to change, for instance.
The Serial Port settings for COM3 and COM4 are jumper selectable whereas the settings for
COM1 and COM2 are entirely software-configured in the BIOS.