From: utzoo!decvax!ucbvax!C70:info-cpm Newsgroups: fa.info-cpm Title: warm boot patch Article-I.D.: ucb.1695 Posted: Wed Aug 4 12:35:14 1982 Received: Thu Aug 5 04:37:08 1982 >From FJW@Mit-Mc Wed Aug 4 12:35:01 1982 Whatever you do, don't fool with the contents of the jump at 0, unless you know exactly what you are doing. Fortunately, you haven't found those bytes in an obvious place because the BIOS inserts those bytes "by hand". What you should do, instead, is change the JMP or CALL address at D303 (or to the address where THAT jump/call points to), and insert your address there. Make sure your routine, in turn, jumps to the next address after the patched address, and includes whatever instruction you may have overlaid if you did not patch over a jump. Do not end with a RET, of course... --Frank