Remote-processing RPC-2300 Bedienungsanleitung PDF herunterladen (Seite 14)

DATA MEMORY CHAPTER 5

Page 12 RPC-2300

Figure 5-1 Jumpers W4 and W7

INTRODUCTION

The SBS-2300 is available with 128K of RAM. A 512K

RAM may be installed at any time. RAM is in socket

U2. RAM m ay be battery backed by installing a DS-

1213D in socket U2. RAM is installed on top of U2.

Battery life will depend upon RAM size, its power

consumption, and amount of time the board is operating.

Generally, a battery life from 5 to 10 years can be

expected.

This chapter discusses changing RAM, installing a

battery backup for RAM , saving and retrieving

variables, and running assem bly language progr ams.

Figure 5-1 shows the location of U2 and jumpers W4

and W7 (for RAM size change).

Increasing RAM size does not increase the program size

CAM BASIC II can handle. M aximum program and

variable size is 30K. Additional RAM does increase the

amount of variable and string storage available using the

PEEK and POKE comm ands.

Due to the memory mapping scheme, the additional

amount of memory available when a 128K or 512K

RAM is installed is 32K less than the memory size.

Thus, a 128K RA M pr ovides 96K of program and d ata

memory and a 512K provides 480K.

If program and data are battery backed, the UNNEW

command may be used to restore the program.

Variables used by the Basic program are cleared,

however. Certain variab les are pr eserved and data

POKEd into RAM is saved.

There is an interaction between the speaker and when

512K of RAM is installed. This is discussed below

under CHANGING MEMORY.

CHANGING MEMORY

Different types of memory can be installed at any time.

SBS-2300 models come with 128K of RAM installed.

Up to 512K can be installed.

To change a memory chip, you need to rem ove the

original chip, install the new one, and set jumpers W4[2-

3] and W7[1-2][3-4].

To install a new memory chip:

1. Turn off power to the SBS-2300.

2. Remove the memory chip from U2.

3. Orient the chip so pin 1 is closest to the card edge.

Install the new chip into the socket.

4. Check and change, as necessary, jumper W4 and

W7 to conform to the new memory.

RAM size Jumper

W4 W7

128K [1-2] [1-3][2-4]

512K [2-3] [1-2][3-4]

NOTE: The spea ker is disabled when a 512K RAM is

installed.

BATTERY BACKUP

A Dallas Semiconductor DS-1213D is used to battery

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 35 36

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