VME 2528 is a 128 bits of TTL compatible I/O with individual port direction control jumpers, 24 mA output current sink capability, 8- or 16-bit transfers, double eurocard form factor, non-privileged or supervisory short I/O transfers, alternating grounds on I/O pins, real time loopback and positive or negative true data I/O option.
VME 2528-128-bit TTL Digital Input/Output Board Datasheet
Jan. 18, 2016