While we're on this topic, I wanted to mention that I am looking for a 67MB version power supply. I have taken pictures of the two kinds of UNIX PC power supplies should anyone be interested: 67MB UNIX PC Power supply http://vintagecomputer.net/att/3B1/ATT_UNIX-PC_3B1_370429065_pwr_suppl.jpg Earlier "7300" UNIX PC Power Supply. http://vintagecomputer.net/att/7300/ATT_UNIX-PC_7300_pwr-suppl-b.jpg There seems to be some confusion about what you call the 67MB UNIX PC. Is it a 3B1 or a 7300? I also need an earlier 7300 motherboard. For either, please contact me directly. Thanks. Bill