Ampro Corporation 486E manual Jumper Configuration Options, System I/O Map

Little Board™/486e Technical Manual

Jumper Configuration Options

Ampro installs optional jumpers in default positions so that the Little Board/486e CPU requires no special jumpering for immediate operation. Jumper-pin arrays are designated W1, W2, and so forth. Jumper pins have a 2mm pitch. A square solder pad identifies pin 1 of each jumper array.

Table 2–2 provides a summary of jumper use. In the Default column, two numbers separated by a slash (for example, 1/2) means that pins 1 and 2 are shorted with a 2 mm jumper block.

Table 2–2. Configuration Jumper Summary

Jumper

Group

Function

Default

W1	Memory SWAP	ON
W2	Byte-Wide S0 Configuration	1 /2, 4/5, 7/8, 6/9
	(default is Flash EPROM)
W3	Compact Flash Master/Slave Selector	OFF (Slave)
W4	Watchdog Timer Output Select	OFF (No Selection)
	(IOCHECK, Reset)
W5	Serial 2 RS-232/RS-485 Select	1/2 (RS-232)
W6	RS-485 Termination Enable	OFF (No Enable)
W7	Serial 3/4 IRQ Sharing	2/3 (Non-sharing)
W8	Serial 3 IRQ Selector	1/2 (IRQ 11)
W9	Serial 4 IRQ Selector	1/2 (IRQ 10)
W10	LCD Power Selector	1/3 and 2/4 (+5V)
W11/W12	Video Controller Enable	ON/ON (Enable)
W13	Ethernet SEEP Enable	OFF (Enable)
W14	Power Fail Monitor NMI Enable	OFF (No Enable)

System I/O Map

Table 2–3 lists the I/O port assignments of the Little Board/486e CPU. The I/O port functions and addresses are both hardware and software compatible for all standard PC applications.

The ROM BIOS typically provides all of the services needed to use the onboard and I/O port connected devices. If you need to directly program the standard functions, refer to a programming reference for the PC/AT.

2–4