The TTL control I/O option for the SIS3316 is finally available.
It conists of two piggy cards that can be installed on new units or retrofitted on existing boards in the factory or by skilled electronics workshop personnel.
The outputs can drive about 40 mA or loads from 60 Ω on. The inputs have an impedance of 50 Ω or high impedance (given the termination jumper setting like in the NIM case).