Specifications

Hardware Configuration
2–40
! In SETUP, enable the expansion BIOS ROM at CC000h. (If you do not use a boot PROM, this
option should be disabled.)
! Remove W9 and install W13.
! Program the PROM with your boot PROM code using a utility called PGMIBIOS.COM, supplied
by Ampro on the utility disk that comes with the Little Board/486i Development Kit.
! Enable “Boot from Floppy” in SETUP. (SETUP is described in Chapter 3.)
2.13.2 Connecting to the Ethernet Cable
The Ethernet interface supports two Ethernet media, 10BaseT (twisted pair) and the AUI interface.
The interface connectors are described in this section.
Ampro supplies an optional transition cable assembly that plugs into the AUI connector. The AUI
interface cable provides a female DB-15 connector. Contact Ampro for information on ordering this
cable.
Twisted Pair Interface (J7)
The twisted pair interface (10BaseT) appears on connector J7. It is a standard RJ45 telephone-type
modular connector, which is the normal connector used with standard twisted-pair cables. If you are
using the twisted-pair interface, you must select it using SETUP. Details are provided in Chapter 3.
The following table lists the signals and pin numbers of J7:
J7 Pin Function
1 + Transmit Data
2 - Transmit Data
3 + Receive Data
4N/C
5N/C
6 - Receive Data
Table 2-29 RJ45 Twisted Pair Connector (J7)
AUI Interface (J8)
You can connect the Ethernet interface to a LAN through the standard Adapter Unit Interface (AUI)
connection. The AUI connects to an external transceiver or MAU which, in turn, connects to the
LAN cable. The AUI enables you to connect your node to fiber optic, thick net cable, or other
Ethernet media, with the appropriate MAU. Connect the AUI adapter cable to J8. Ampro offers an
optional AUI adapter cable to connect between J8 and a standard MAU adapter cable. Length of the
MAU cable should be less than 24 inches.
If you use the AUI interface, you must supply +12V, via the PC Expansion Bus connector, J1A/B, or
power connector, J10.