info-mac@uw-beaver (info-mac) (07/13/84)
From: imagen!geof@su-shasta.arpa I spoke to an Apple-person at NCC Wednesday. He indicated that there were four hard disk products out there for the MAC (I didn't go into names). Two use direct, non-applebus connections to the MAC. One uses an applebus-compatible connection to the MAC. One uses the `second disk' port. There is only one applebus port on the MAC. Thus if your hard disk (or whatever) doesn't use an applebus-compatible protocol to talk to that port, you can't run applebus on the MAC while that peripheral is hooked up (applebus-compatible does not necessarily mean that it can be shared with other macs on the ABus, just that it knows how to live in that multi-drop environment). User beware. Because applebus is pretty slow as nets (and hard disks) go, it is probably the case that the applebus-compatible disk is slower to access than the others. The disk that used the disk port seemed to me to be the best compromise, although I don't really know the details. - Geof Cooper Imagen