IBM 3745 Series, Hardware Maintenance Reference

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Bus Terminator (TERMI) Connector Pin Assignments
│
│
Wð2──┐ W13──┐ ┌──Xð2 ┌──X13│
┌6──────────────6┐ ┌6──────────────6┐ │
┌┘ ZB └┬─┬┘ ZA └┐ │
└─&──────────────&─┴─┴─&──────────────&─┘ │
W22──┘ W33──┘ └──X22 └──X33│
─────────────────────────────────────────────────────┘
Basic Board Rear Side, TERMI Location
ZB
┌────┐
│ └────┐
+ TA Tag. . . . . . │W22 Wð2│ + Data Byte 1 Bit P
+ TD Tag. . . . . . │W23 Wð3│ + Data Byte 1 Bit ð
+ IO Tag. . . . . . │W24 Wð4│ + Data Byte 1 Bit 1
+ OUT Tag . . . . . │W25 Wð5│ + Data Byte 1 Bit 2
+ Halt Tag. . . . . │W26 Wð6│ + Data Byte 1 Bit 3
+ CS Req. Priority. │W27 Wð7│ + Data Byte 1 Bit 4
+ Level 2 Priority. │W28 Wð8│ Ground
+ Valid Byte. . . . │W29 Wð9│ + Data Byte 1 Bit 5
+ Modifier. . . . . │W3ð W1ð│ + Data Byte 1 Bit 6
+ End of Chaine . . │W31 W11│ + Data Byte 1 Bit 7
+ Parity Valid. . . │W32 W12│ + Reset Tag
+ Valid Halfword. . │W33 W13│ + CA Nohold
│ ┌────┘
├────┤
├────┤
│ └────┐
+ IRR . . . . . . . │X22 Xð2│ + CA MOSS POR
+ CS Req. Low (CA). │X23 Xð3│ + CA Level 1 to MOSS
+ CS Req. High (CS) │X24 Xð4│ + CA Level 4 to MOSS
+ Data Byte ð Bit P │X25 Xð5│ + CA CSG Bypass
+ Data Byte ð Bit ð │X26 Xð6│ + CA CSG Bypass
+ Data Byte ð Bit 1 │X27 Xð7│ + CA Valid Feed Auto
+ Data Byte ð Bit 2 │X28 Xð8│ Ground
+ Data Byte ð Bit 3 │X29 Xð9│ + CA Valid Feed Auto
+ Data Byte ð Bit 4 │X3ð X1ð│ + CA Sample Bypass
+ Data Byte ð Bit 5 │X31 X11│ + CA Sample Bypass
+ Data Byte ð Bit 6 │X32 X12│ + CA Sample Wrap DOT
+ Data Byte ð Bit 7 │X33 X13│ + CS Grant Low
│ ┌────┘
└────┘
ZA
3-60
IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference