dave@micropen (David F. Carlson) (01/08/87)
In this months Byte (Jan '87) there is a review of ibm/pc memory boards by Wayne Rash jr. (who I believe I have seen on this net before.) Anyway...there are several vagueries theat I wondering if anyone in this forum can help me under- stand. On page 319 in describing the Cheetah-brand memory expansion cards configured with 70nS ram: "Since the cards run at full speed *regardless of the speed of the computer* Cheetah says that applications operate much faster in 70nS memory." (** italics mine.) This makes no sense to this engineer. Further, he mentions "[board failures at high clock rates] seems to get worse as you add more boards. If you must have a great deal of memory, say 12 to 16 meg. [then Cheetah boards], which have 70nS. RAM." As a user of a loaded PC/AT, I have never heard that expansion memory can slow access times. Is this phenomenon common? I have not tested any PC/AT at speeds faster than 8MHz, but if my product's migration to faster boxes is stopped due to the cost of expansion boards, there is going to be fur flying. Please comment. -- David F. Carlson, Micropen, Inc. ...!{seismo}!rochester!ur-valhalla!micropen!dave "The faster I go, the behinder I get." --Lewis Carroll