IBM System/32 Introduction And Maintenance Manual page 404

\
Wave Form 248
r-~r-~---+---r--~--~--T---r-~r-~
G2S04
~-+~~~~~---~-+~~~~~~
Sync-internal, 0.2 ms/div
Channel 1, 0.5 V /div
Channel 2, 5 V /div
Ramp Clock A
D2U05
Channel B Eye
Rectified
10-38