Vertical PCB Buffer Machine With Intelligent Intermediate Storage The HS-HC250 and HS-HC350 are vertical PCB buffers built around intelligent intermediate storage : inspected boards are held in a controlled rack, released on demand, and the line keeps balancing itself between AOI, SPI and downstream stations. Instead of losing output every time an inspection station pauses, the buffer absorbs the difference and feeds boards back at line speed. Why Intelligent Intermediate