Ampro Corporation 486E manual Jumpering the Byte-Wide Socket, Byte-Wide Socket Signals

Little Board™/486e Technical Manual

Jumpering the Byte-Wide Socket

You must jumper the byte-wide socket for the devices you install. Jumper array W2 configures S0 for a particular device type. Table 2–38 shows how to install jumpers for supported memory devices.

Table 2–38. EPROM Jumpering for S0 (W2)

EPROM

Typical Devices

Pins

Jumper Diagram

128K EPROM - 27C010	32	1	3
256K EPROM - 27C020
		7	9
512K EPROM - 27C040	32	1	3
1M EPROM - 27C080
		7	9

Byte-Wide Socket Signals

A jumper W2 for S0, configures the byte-wide sockets for specific memory devices. Table 2–39 lists the signals that appear on the pins of W2.

Table 2–39. Byte-Wide Jumper Pin Signals (W2)

W14 Pin

Signal

Name

Description

1	A18	Address A18 (static)
2	Pin 1	Connection to pin 1 of the byte-wide socket
3	A19	Address A19 (static)
4	Pin 31	Connection to pin 31 of the byte-wide socket
5	-SMEMW	Write strobe
6	Pin 29	Connection to pin 29 of the byte-wide socket
7	A15	Address SA15 from the expansion bus
8	Pin 3	Connection to pin 3 of the byte-wide socket
9	A14	Address SA14 from the expansion bus

2–52