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Memory Boards P/N 6404313 through 640431 6
Switch bank 1 i s used t o set the start ing address o f the board . This
is
done by entering the actual starting address minus one as a
hexadecimal number . Therefore , a starting address of 20000 is entered
as 20000 - 1 or lFFFF . Since switch 1 of bank 1 represents address bit
16 and switch 2 of bank 1 represents bit 1 7 , a value of hexadecimal
01 is set as :
ADDRES S
BITS
X indicates that the switch is set to the open position.
To set a bit on , the appropriate switch must be set to the open po
s it ion as s hown here . Switch bank 2 is used to set the ending address
on the board. This is done by entering the actual ending address plus
one .
The chart that fol lows shows the switch sett ings for dif ferent
amounts of memory instal led on each board .
2
2
8
8
4
1
4
1--1--1--1--1--1--1--1--1
I
I
I
I
I
I
I
I
I
I
I
I
I
I
1--1--1--1--1--1--1--1--1
2
2
2
2
1
1
1
2
3
1
8
7
0
9
1
I
I
0 1 hexa decim al
I X I
=
1
6
Fault Detection 2 - 6
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