IBM 2025 Maintenance Manual page 15

2
0
1
B2U2
ADDRESS BITS
=
3, 6, 7, 8
ADDRESS BITS
=
2, 3, 4, 5
16
0,000
0000
BIT 6
= $
0,001
8
0 0 0 1
0,010
0 0 1 0
BIT 2
= '
0,011
16
0 0 1 1
B2E2 B2R2
BIT 3
=
$
16
0,100
1 0 0 0
BIT 6 = 1
0, 101
1 0 0 1
0,110
1 0 1 0
BIT 2
=
1
0, 111
16
1 0 1 1
B2E2 B2S2
16
1,000 0 1 0 0
BIT 6
=
$
1,001
0 1 0 1
1,010
0 1 1 0
BIT 2 =
$
1,011 16
0 1 1 1
B2E4
B2R4
BIT 3 = 1
16
1,100
1 1 0 0
BIT 6 = 1
1, 101 1 1 0 1
1,110 1 1 1 0
BIT 2 = 1
1, 111
16
1 1 1 1
B2E4
B2S4
Figure 1-6. Core-Storage X-Decodes
2025 FEMM (7/69} 1-5