Aucbvax.6379 fa.works utzoo!decvax!ucbvax!works Fri Mar 5 09:29:20 1982 >From TANG.MIT-AI Thu Mar 4 11:05:28 1982 I think that the IBM PC Bus is position independant (unlike the Apple II, OSI, or Atari buses, but like the S-100) so that all Techmar does is buffer the bus & add a power supply. Given that the IBM cards have connecters on their rear edges, I bet that the expansion box's back looks just like the IBM PC to the installed cards. Jack Palevich