Remote Processing RPC-330 - Manual (Page 18)

RAM MEMORY SECTION 5
Page 5-1 RPC -330
Figure 5-1 RAM and W1 ju mper location
J2 from card
3 Tx Out
4 RTS In
5 RXD In
6 CTS Out
9 Ground
10 + 5
INTRODUCTION
32K, 128K, or 512K of RAM may be battery backed on
the RPC-330. RA M size may be changed at any time.
RAM is in socket U5.
RAM is backed up when a DS1216DM is installed.
Battery life depends upon RAM size, its power
c o ns u m pt io n , a mb ie n t t em p e r at ur e , a nd a m ou n t o f ti m e
the board is operating. Gener ally, a battery life of about
3 to 5 years can be expected. Operating the board at
50°C reduces battery life by 1/2.
The DS1216DM is also a real time clock. Thus, DATE
and TIM E function s and com mands a re availa ble when it
is installed. See SECTION 7 for related information.
This section discusses changing RAM, saving and
retrieving variables, r unning assembly language
program s, and battery condition. F igure 5-1 shows the
location of U3 and jumper W1.
Increasing RAM size does not necessarily increase the
program size RPBASIC-52 can handle. Maximum
program and variable size is 60K. Additional RAM does
increase the amount of space available for PEEK and
POKE storage.
CHANGING MEMORY
Different types of memory can be installed at any time.
RPC-330 models come with either 32K or 128K of RAM
installed. Up to 512K can be installed.
To change a mem ory chip, you need to rem ove the
original chip, install the new one, and set jumper W 1.