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RAM MEMORY CHAPTER 5

Page 16 RPC-30

Figure 5-1 Jumper W2 and RAM chip

INTRODUCTION

RPC-30 models are available with 32K or 128K of

battery backed RAM. A 512K RAM may be installed at

any time. RAM is in socket U10.

RAM is automatically backed up when it is installed.

The battery is shared with the clock (U17) and controlled

by the reset/watch dog timer (U6). 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, saving and

retrieving variables, running assembly language

programs, and battery maintenance. Figure 5-1 shows

the location of U8, jumper W 2, and the battery.

Increasing RAM size does not increase the program size

CAM BASIC can handle. M aximum progr am and

variable size is 30K. Additional RAM does increase the

amount of variable storage available.

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.

Both program and data are battery backed. After a

power up or reset, simply type in the UNNEW command

to restore the program. V ariables used by the Basic

program are cleared, however. Other variables can be

preserved. Read RESER VING M EMO RY below for

more information.

There is an interaction between the speaker and when

512K of RAM is installed. This is discussed under

CHANGING M EMORY

CHANGING MEMORY

Different types of memory can be installed at any time.

RPC-30 models come with either 32K or 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 jumper W2.

To install a new memory chip:

1. Turn off power to the RPC-30.

2. Remove the memory chip from U8.

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

If installing a 32K RAM, place the chip at the

bottom

of the socket (m emor y chip pin 14 goes into

socket pin 16). The top two socket pins in each row

will be empty.

If installing a 128K or 512K, install the chip into the

socket.

4. Check and change, as necessary, jum per W 2 to

conform to the new mem ory.

RAM size Jumper

32K [2-3]

128K [2-3]

512K [1-2]

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

installed.

BATTERY BACKUP

The RPC -30 battery operates the clock and backs up the

RAM when power is off. Battery life will depend upon

RAM size, type, and time the RPC-30 has power applied

to it. You can expect the battery to last between 3 to 10

years, depending upon operating temperature.

NOTE: Do not place the RPC-30 circuit on a metal

surface, even with the power off, without

standoffs. Voltage is present on the circuit side

of the board and it is possible to short out the

battery supply through the circuit traces.

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