JSimm/HSIO is a memory-mapped, fully buffered, High Speed I/O interface. HSIO has eight data bits, twelve address lines, read and write strobes, two chip selects, two 3.3 VDC pins, and four ground pins on a shrouded, polarized 2mm 15x2 header. HSIO timing is adjustable over a wide range to accomodate virtually any peripheral. Signals are 3.3V TTL, compatible with 5 V TTL or 3V CMOS.

JStik is the first controller module to implement an HSIO interface. Systronix has several JSimm/HSIO systems in development (see 'JSimm Products' in the navigation bar above), and other JStik developers have implemented a variety of I/O devices on the HSIO bus - please see the JStik discussion list archives for that information.