IBM 3274 51C Maintenance Information page 150

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Your mllChine may IIlrtlldy have connector Instlll/ed.
E. 01 A-A 1 Board - Model 51 C (Without 2400-,4800-, and 9600-bps Integrated Modem), Part Number 5643329 or 6226635
Figure A-12 (Part 2 of 2). Card Locations