The LAVA Parallel Bi-directional has been a Lava product since 1984. Since that time the board has gone through relatively few design changes. Other than gaining an 8-bit bi-directional mode it is functionally identical to the original Lava Parallel. In the fast-moving world of computer hardware that might be some sort of a record! The board has been hailed as the most reliable bi-directional product on the market with the widest range of operating system support.