Honeywell SPC I/O Module Part No :- 51304155-100 Assy No :- 51304156-100 Brand :- Honeywell Series :- TDC 3000 0-15 PIN BR07W03-A0015 The SPC I/O provides interface between the Smart Peripheral Controller (SPC) and the Wren drives in the earlier a non-WDA version of the History Module.This paddle board has the connector for the SCSI 50-conductor ribbon cable between the SPC I/O and the Winchester drive tray.