On 13/04/18 15:02, Seymour J Metz wrote:
Unpacking x'0123' gives you x'F0F132'; the OI then gives you x'F0F1F2'; what you want is x'F0F1F2F3'. Or with an UNNPK length of 4 you get x'F0F0F1F2'; still not what you want.
Suppose the byte after the X'0123' is X'xy' (where x and y are any hex digits). Unpacking X'0123xy' (with a source length of 3 and a destination length of 5) gives you X'F0F1F2F3yx' which, when you drop the last byte, gives you what you want. This assumes that there is an addressable byte immediately after X'0123' For a general solution, copy the source field to a sufficiently large work area before unpacking. -- Martin Dr Martin Ward | Email: mar...@gkc.org.uk | http://www.gkc.org.uk G.K.Chesterton site: http://www.gkc.org.uk/gkc | Erdos number: 4