Keysight 34950A User’s Guide 9
34950A 64-Bit Digital I/O Module with Memory and Counter
The 34950A has 64-bits of general-purpose digital I/O grouped in 8-bit channels 
with programmable polarity, input thresholds, and output levels. The module is 
segmented into two banks of four 8-bit channels. Each bank has 64 Kb of volatile 
memory for pattern capture and pattern generation with hardware interrupt 
capability. Up to three pins of handshaking are available for each bank of 32 bits. 
The module also has two 10 MHz frequency counter/totalizer measurement input 
channels and a programmable clock output for frequency synchronization or 
general clocking needs.