I just called timeline... The information they supplied me is as follows... This is a 2 card cable-connected set; One card is labeled IBM XT 1602509, The other is labeled IBM AT 6236115. No software was available for the cardset. They also suggested that I call back later (when someone with a technical background would be available...) If I find out more, I'll drop the list a note... If anyone on the list happens to have the 370 emulator cardset, it would be nice if they could check out the part numbers. BTW, they also indicated that they had quite a few of these available. -al -acorda(a)geocities.com