Attached is bounce.uc and init.h which should receive a 64byte packet from MAC 1 port 0 (gigabit) and send it right back out (it doesnt change the addresses or anything). It doesnt work. Apparently, ctx_arb[start_receive] never returns which means that the recv request never completes or is formatted improperly. Im running bounce.list on uE 0 so Im having the IX bus signal thread 0. If you run it, my seven-segment-display says A1 meaning that it hasnt gotten back form the ctx_arb yet. If it says A2 its gotten back. The other status symbols are in bounce.uc. Id appreciate any help, thanks, Austen McDonald austen@cc.gatech.edu God does not care about our mathematical difficulties. He integrates empirically. -- Albert Einstein