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