IBM 3745 Series, Hardware Maintenance Reference

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Line Addressing
The line address used by the control program is composed of the LA address, pre-
viously defined, and of the LIC/PORT address given at TD time of the IOH using
byte 1, bits 2 to 7:
Line Numbering
Depending on the configuration, two cases of line numbering are possible:
1. The floating LIC board 01L-A2 is LIB1 type (LICs type 1-4).
Possibility of 96 lines, LICs type 1-4 and 16, lines LICs type 5-6 numbered as
follows:
┌─────────────┐┌─────────────┐
│32
││8ð │
│ LIC 1-4 ││ LIC 5-6 │
│ ð1M-A1 ││ ð1L-A1 │
│ 63││ 95│
└─────────────┘└─────────────┘
┌─────────────┐┌─────────────┐
│ðð
││128 │
│ LIC 1-4 ││ LIC 1-4 │
│ ð1M-A2 ││ ð1L-A2 │
│ 31││ 159│
└─────────────┘└─────────────┘
2. The floating LIC board 01L-A2 is LIB2 type (LICs type 5-6)
Possibility of 64 lines, LICs type 1-4 and 32 lines, LICs type 5-6 numbered as
follows:
┌─────────────┐┌─────────────┐
│32
││8ð │
│ LIC 1-4 ││ LIC 5-6 │
│ ð1M-A1 ││ ð1L-A1 │
│ 63││ 95│
└─────────────┘└─────────────┘
┌─────────────┐┌─────────────┐
│ðð
││64 │
│ LIC 1-4 ││ LIC 5-6 │
│ ð1M-A2 ││ ð1L-A2 │
│ 31││ 79│
└─────────────┘└─────────────┘
Chapter 3. Buses
3-39