MICROCODE REASSEMBLED. LDB AND DPB WILL NOW ERROR ON BYTES LARGER THAN 23. BITS. ALSO, DPB WILL ERROR ON A DPB WHICH ATTEMPTS TO CHANGE THE SIGN OF A FIXNUM. THIS LAST IS SORT OF A DIAGNOSTIC TO SEE HOW MANY THINGS WILL GET BROKEN IF DPB IS CHANGED TO CREATE A BIGNUM IN THIS CASE.