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I.L. 01-50544-00

CONTENTS

The SRAM PC104 Battery Backed Memory Card

(BBMC) kit includes the following:

 Memory 

card

  ISA CPU adapter card

 Software 

diskette

 Manufacturer’s 

manual

  Video extension cable

  Stake pin protector

  Additional hardware (plastic bag)

 ESD 

strap

  This instructional leaflet

  SRAM Memory Chip

DESCRIPTION

The SRAM PC104 BBMC is a device that can emulate

a floppy disk drive or expand RAM capacity. Two

versions are available. One version requires an ISA

adapter in order to fit into a standard PC ISA slot. The

coupling of the adapter card and memory card will

occupy the space of two ISA slots, even though only

one ISA slot is used. The second version can be

connected to the CPU card using an ISA CPU adapter

card. Two SRAM PC104 BBMC can be installed.

NOTE:

  The PC104 board can only be used as a hard

drive emulator with DOS.  All other operating systems

support the PC104 board as retentive memory only.

Figure 1 – SRAM PC104 BBMC

HARDWARE CONFIGURATION

The SRAM PC104 BBMC comes with a ROM BIOS

chip and one memory chip.
NetSolver uses the SRAM PC104 BBMC as a raw

memory source, commonly referred to as retentive

memory. To accomplish this Install the supplied SRAM

Memory chip in Socket 1 of Bank 1.

The following information describes how to configure

the memory card for use with a NetSolver application.

Memory Type

Even though the SRAM PC 104 BBMC supports

SRAM, EPROM and FLASH memory, the retentive

memory driver only uses SRAM.
There are six 32-pin sockets to house the memory

chips. The sockets are divided into two banks (three

sockets each). Bank 1 is controlled by J6 and Bank 2

is controlled by both J5 and J7.
Settings for J6:

Open/Closed/Closed – All sockets of Bank 1 enabled
Settings for J5 and J7:

J5: Open/Closed/Closed – Socket 3 of Bank 2 enabled

J7: Open/Closed/Closed – Socket 1&2 of Bank 2

enabled

Memory Address

There are seven possible memory addresses. If all

seven addresses conflict with other hardware, the

memory card cannot be used. The NetSolver standard

address is 0xD800. Setting the memory address is

done using J1, J2 and J3.
J1: Open – J2: Closed – J3: Open

Onboard Battery Control

J8: Open/Closed/Closed/Open – enables the on board

battery to backup the SRAM memory.

Memory Device Selection

J4: Open/Closed/Closed – enables SRAM devices.

BOARD JUMPER DEFINITIONS

There are eight jumpers used to configure the card.

  J1, J2 & J3 select the memory address.

Disable – J1 = Closed, J2 = Closed, J3 = Closed
C800    – J1 = Open, J2 = Closed, J3 = Closed
CC00    – J1 = Closed, J2 = Open, J3 = Closed
D000    – J1 = Open, J2 = Open, J3 = Closed
D400    – J1 = Closed, J2 = Closed, J3 = Open
D800    – J1 = Open, J2 = Closed, J3 = Open
DC00    – J1 = Closed, J2 = Open, J3 = Open
E000    – J1 = Open, J2 = Open, J3 = Open

  J4 is used for battery selection. To use the internal

battery (recommended), jumper posts 2 & 3.

  J5 is used to enable/disable socket 3 of Bank 2.

Enable – Open/Closed/Closed
Disable – Closed/Closed/Open

SRAM PC104 Battery Backed Memory Card

Bank 2

Bank 1

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