Specifications

EPC-33/34 Hardware Reference
Page C-4
C C
I/O Base Address
The Ethernet controller uses 32 bytes in I/O space. The I/O Base Address must be
selected using the AUTOSET program. The AUTOSET program can only access
the Ethernet controller when the I/O space occupied by the Ethernet controller does
not conflict with I/O space previously assigned. In addition, the network interface
drivers used with the Ethernet controller must use the same I/O base address
parameter as the Ethernet controller.
The Ethernet controller is programmed at the factory with a default I/O base address
of 280h. If necessary, use the tab key to choose an optional address according to the
guidelines set out in the following sections. AUTOSET allows selection of the
following I/O base addresses: 240h, 280h, 2C0h, 300h, 320h, and 340h.
Warning: If the Ethernet controller is mistakenly programmed to
use an I/O address that conflicts with another I/O device, the
AUTOSET program will not pass the diagnostics test. In this
case, disable the other device or select a different I/O address for
the Ethernet controller. For example, an Ethernet controller
installed in a system that also contains a SCSI controller must not
be set to I/O base address 340h.
Adapter Architecture
The Ethernet controller has up to 16K bytes of shared memory buffer. The default
shared memory base on the Ethernet controller is DC00h.
If using the DOS expanded memory manager or Microsoft Windows, be sure to
exclude the area of memory reserved for the Ethernet controller base memory.
For instance, if the Ethernet controller shared memory selected is 16K bytes and is
located at DC00h, when you finish using AUTOSET, include the following
statement in the CONFIG.SYS file:
DEVICE=C:\DOS\EMM386.EXE X=DC00-DFFF ... other parameters ...
For Microsoft Windows, include the following statement in the [386Enh] section of
the SYSTEM.INI file:
EMMExclude=DC00-DFFF