21 Slot Microbus Backplane 96/96 connectors - PTH Eurocard backplanes designed for use with microprocessors, with reliability of plated through holes, minimal cross talk, fitted with DIN 41612 connectors, and DIN 41494 card frame compatible, Choice of connector styles and pitches: 3HP(15.24mm) for PCB's for hard wired daughter boards, 4HP(20.32mm) for two level wirewrap daughter boards. A low cost version of the Microbus backplane still with the reliability of plated through holes but with restricted in use to only 64/96 way connectors. The basic design is with pin 2 and 31 on rows A and C are committed to Vcc, This leaves 56 separate signal lines from lines from pin 3 A and C to pin 28 A and C inclusive. Tests have been carried out on the 84HP version by feeding a 1MHz square wave signal (5ns rise and fall times) through a DIN 41612 connector and measuring the adjacent tracks at the opposite end. Note: The micro bus motherboard was not terminated, which would have reduced the amplitude to the cross talk and changed its shape considerably. Also available from RS part number 435-068