_ DEC-O-LOG for KA43 _ DOL, KA43-O001, VAXstation 3100, Mar 91 PROBLEM: National Semiconductor informed DEC of a fault in their 74F244 chip that results in heavily loaded outputs of the 74F244, when multiple lines are switching, failing to stabilize per specifications. The resulting instability can cause unpredictable results if the outputs are sampled during this unstable period. FIELD EFFECTIVITY: This FCO is for VAXstation 3100, Model 76 ONLY. QUICK CHECK: Only after successful removal of the graphics co-processsor module, per instructions in FCO document, can you determine if the chips at locations E49, E50, E54, E55, E55 and E79 are made by National Semi- Conductor. If they are, and the date code on them indicates week number between 30 and 42, then the module must be replaced. Note: The number on the chip is in the format, "02MP036S". The "036" is the date code. The "0" is for the year 1990 and the "36" is the week number. FCO KIT ORDERING EQ-01607-01 FCO, Parts FA-04937-01 FCO Document