EQ-SFM-MAX-V1.3 - High-speed I/O Driver Module for PPM3-MK2 / PPM4-MK1 Programmer The EQ-SFM-MAX-1.3 is a High-speed / High Current - Spare Special Function (I/O) Driver Module for the PPM3-MK2 / EQ-SFM-MAX-V1.3 - High-speed I/O Driver Module for PPM3-MK2 and PPM4-MK1 Programmer. The Module can be interchanged in case of damage to the I/O driver circuitry.