I haven't been following this thread that closely so what I'm about to say may be repetitous of other statements. Slots I have known... ISA - One section(8-Bit) or two section (16-bit) Main characteristic: wide contacts. Color -Usually Black VESA Local-Bus(VLB)- A 16-bit ISA slot with a small narrow contact section behind it. By necessity all VLB cards where "full length" at least along the contact edge. Color - "add-on" is usually brown. EISA - physically similar to a 16-bit ISA slot. (It had to support ISA cards) Main difference is the number of conacts. The contacts are about half the size of an ISA slot. Color - Black or Brown depending on maker. NOTE: All ISA derivitave slots are off center to the opening at the back of the case. MCA - Smaller off-center slot positioned to start about half way up the 8-bit portion of an ISA slot. In general if a system has MCA slots thats all it has. Mostly IBM systems (PS/2 Models 50, 60, 80, and some 70) Some other makers may have used MCA. Color-Usually brown PCI - Small centered slot. Design allows "sharing" of an opening with ISA slot. Only one can be used at a time. Color - Usually White. My memory's a little rusty on some of this so it may not be exactly correct. On Tuesday 18 September 2001 14:58, you wrote: > On Tuesday 18 September 2001 14:30, Carl Wilhelm Soderstrom wrote: > > > How would one go about determining if it is or not? I don't think I > > > have the hardware manuals. > > > > using the Mark1 Eyeball is probably the simplest way. if they don't look > > like PCI or ISA slots; they're probably Microchannel. > > > > Carl Soderstrom -- Jack Ungerleider jack at jacku.com