IBM 6400-I15 Maintenance Manual - Page 359
Hammer Bank Logic, Signals and Power, Electrically Erasable/Programmable Read-Only Memory
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DSR Data Set Ready DTR Data Terminal Ready EC Engine Controller (a functional unit of the CMX board) EEPROM Electrically Erasable/Programmable Read-Only Memory EHF Exhaust Fan EL Elevator (motor), Power Stacker EMI ElectroMagnetic Interference EMIT Emitter EPROM Electrically Programmable Read-Only Memory ERR Error ESD Electrostatic Discharge EX Exhaust, Extra EXH Exhaust EXF Exhaust Fan EXP Expansion EXPND Expand FD Feed FF Form Feed FIFO First In, First Out FLT Fault FLTR Filter FP Front Panel (Operator Panel) FTIC Fire Timer Integrated Circuit GND Ground HB Hammer Bank HBA Hammer Bank ASIC HBF Hammer Bank Fan HBL Hammer Bank, Left HBP Hammer Bank Power HBR Hammer Bank, Right HD Hammer Driver HDIC Hammer Driver Integrated Circuit HDPH Hammer Driver Phase HLP Hammer Bank Logic, Signals and Power Abbreviations and Signal Mnemonics 359