It is IBM's clone of the PC/AT with a few exceptions. Hmm, I'm sure you don't mean "IBM's clone of the PC/AT", since IBM could hardly clone their own product. The XT-286 is actually a warmed-over PC-XT motherboard design, adapted to use the 80286 CPU. It was a product positioned in between the XT and the AT in IBM's lineup. 3. Some AT boards will not fit into it. Actually, no AT boards will fit into it. Although it used the AT's 286 CPU, it retained the XT's 8-bit bus, and was limited to 640K RAM (no 16-bit RAM expansion available). In a sense, you can almost think of it as a "286SX", since it is largely analogous to the 386SX in that it had a bus half the width of the CPU internal core (although I'm not sure whether the motherboard RAM was 8- or 16-bit). The XT-286 failed, not just because of its limited expansion versus the AT, but due to competition from the Turbo XT (8-10MHz 8088/NECV20) market, which had similar performance. Kai -----Original Message----- From: Gene Ehrich [mailto:g@ehrich.com] Sent: Wednesday, September 30, 1998 6:23 PM To: Discussion re-collecting of classic computers Subject: RE: IBM XT286 I have an XT/286 in a box and used it for many years. It is IBM's clone of the PC/AT with a few exceptions. 1. It uses an XT case 2 It is 6mhz with 0 (zero) wait states. 3. Some AT boards will not fit into it. Due to the zero wait states it is faster than other 6mhz AT's that do have wait states. gene@ehrich http://www.voicenet.com/~generic Computer & Video Game Garage Sale