Monday 3/30/98 3:21 PM John Young The information contained in http://www.research.att.com/~smb/nsam-160/pal.html appears from my knowledge accurate. One must consider possible malfunction when With the CAT B, it is also possible to check the code, relock the weapon, or rekey it. and limited-try feature disables the bomb if too many incorrect keys are entered. Most references omit the CAT C. It may just be a later model of the CAT B. The new keys loaded were occasionally not the ones intended to be loaded. Back to Pantex for disassembly was the fix. The bubble memory of the T1563 was one of the problems in rekeying reliability, I was told.. Bugs in the about 112,000 lines of rca 1802 assembler code was also a problem. Kent Parsons asked me to look at the code and make a recommendation about what to do. Later bill