Solid State Logic manual Expanding the AR-B7041’ S Memory Capacity

AR-B7041 User¡¦s Guide

CAUTION: BS0 to BS6 are the memory bank select bits. For example, 128KB memory has sixteen 8K-byte banks, so 4 bits (BS0 to BS3) are needed.

Example 1: Select the 10th bank of the MEM4 on the AR-B7041. The AR-B7041 is using 27C020 (256K*8), and the base port is &H220.

100 base_port=&H220

110 OUT base_port+0,&H19

120 OUT base_port=1,&H13

Example 2: Select the last bank of MEM5 on the second AR-B7017 piggyback module. The AR-B7017 is using 27C040 (512K*8), and the base port is &H3A0.

200 base_port=&H3A0

210 OUT base_port+0,&H3F

220 OUT base_port+1,&H1C

5.2 EXPANDING THE AR-B7041’ S MEMORY CAPACITY

There are 2 ways to expand the AR-B7041’ s memory capacity. One is installing 2 AR-B7041 cards in one system and other is using the AR-B7017 memory expansion module.

Up to two AR-B7041 cards can be installed simultaneously. The AR-B7041 firmware will automatically link all of the AR-B7041 cards. In order to use multiple cards, be sure that the AR-B7041 firmware address and base I/O ports meet the following requirements:

•All of the AR-B7041 cards must have contiguous I/O base port

•Each AR-B7041 firmware address must be set to occupy a contiguous area of memory.

The following table illustrates all of valid settings:

Valid

Combination

Item

AR-B7041

First		Second
Base I/O	Memory	Base I/O	Memory
Port	Address	Port	Address

1	220h	CC00h	2A0h	D000h
2	220h	D000h	2A0h	D400h
3	220h	D400h	2A0h	D800h
4	2A0h	CC00h	320h	D000h
5	2A0h	D000h	320h	D400h
6	2A0h	D400h	320h	D800h
7	320h	CC00h	3A0h	D000h
8	320h	D000h	3A0h	D400h
9	320h	D400h	3A0h	D800h

5-2