13 analog inputs (8x1/4" balanced, 4xXLR, 1x1/4" unbalanced), 9 analog outs, (8x1/4" balanced, 1x1/4"unbalanced), ADAT i/o, S/PDIF i/o. 28 discrete inputs can be used at once, plus a few more but this involves bussing via a driver setting. Optional card adds wordclock in, video sync in, LTC.