Many years ago, a company I used to work for did a Centronics port for TURBOchannel. The timing we wound up using was data stable 500nS before strobe, strobe lasts 1mS, data remains stable until 500nS after strobe. IIRC, this is fairly close to what we found in Centronics documentation, but I don't remember what documents we found or what the exact numbers in that document were.