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Battery Backup Operation
For operating your RAM 4A board with Battery backup, simply con
nect your battery to the board at the location indicated on the
Battery Hookup Diagram.
The battery should deliver 3 to 5 volts DC and should supply 300
milliamps of current.
A user defined resistor may be installed on the board to facilitate
recharging the battery while the computer is turned on.
Assembly Diagram for location.)
As an example for picking the value resistor that should be used
to supply the trickle charge to your battery:
For a back plane voltage of (+
and a battery voltage of -
A resistor of 220 Ohms will supply approximately
ma. current as trickle charge to your battery.
2 0
It is also recommended that if you. do not intend to use battery
back-up, remove the three diodes in the input circuit of the
three regulators and replace them with jumper wires.
allow the board to function with a Mother Board voltage of 7 volts
DC rather than 7.7 volts DC.
System Features Test
The special functions of this memory Board far exceeds the functions
of any other memory board on the market today and, because of this,
is going to take a little time for the user to understand all its
capabilities.
A NOTE OF CAUTION:
when using this board is protecting a block of memory where you may
have placed your stack.
A simple test program for testing some of the special features of
your new RAM 4A board follows:
Address Instruction
DB
0 0
FF
0 1
D3
0 2
03
FE
04
DB
05
FE
06
D3
07
FF
08
C3
09
0 0
j
0A
0 0
22
RAM 4A
User Guide
V)
8
C+3V]
(+5V)
One common mistake that is made
Description
INPUT
FROM FRONT PANEL SWITCHES
OUTPUT
TO MEMORY BOARD
INPUT
FROM MEMORY BOARD
OUTPUT
TO FRONT PANEL LIGHTS
JUMP
TO
0
(See
I=E/R
=5v/220 ohms
==.0227 Amps
This will
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