IBM 6151 Maintenance And Service Manual page 314

Step 2
1.
Look at the letter in the 21x (x
=
any letter) SRA, then find the
column for that letter in the following tables.
2. Record the switch settings shown for the letter. Go to "Step 3"
on page 3-2100-4.
SRA Letter A B C D E
F
Off On Off On Off On Off On Off On Off On
Switch 1 X
X
Not Not
X
X
Switch 2 X X valid valid X X
Switch 3
X X I/O I/O
X
X
Switch 4 X X memory memory X X
Switch 5 X
X
addresses addresses
X X
Switch 6 X
X X
X
Switch 7 Either Either Either Either
Switch 8 Either Either Either Either
Starting
Address 000000 040000 080000 OCOOOO 100000 140000
of 256K
bytes
3-2100-2 Service Manual