Many VLB form factor slots will support 33MHz VLB cards but do not support bus mastering. These are commonly referred to as "Slave" slots although they are not "slaves" in the common sense of having some signals controlled by a separate master. They are more accurately described as non-VLB compliant slots since they do not comply with the VESA specification. Most (maybe all) VLB video cards do not perform bus mastering, and will run perfectly in a "slave slot".
When setting up a VLB computer, care should be taken to put bus mastering cards into "master" slots. Non-bus mastering cards ("slaves") may be used in any slot as may ordinary ISA cards.
Return To Index Copyright 1994-2008 by Donald Kenney.