* I dont see a need for the DONE routine. Why have you got to move the data from CODEMEMORY to 50H to perform addition. You might as well do it from CODEMEMORY itself.

* If I were you, would have done something like this :

- First write and check a 16 bit addition routine.(ADD16)

- Initialize 2 bytes to zero.(ANSWER+0, ANSWER+1)

- Set a pointer to CODEMEMORY and set a counter for 32 additions.

- Call ADD16, 32 times to add the number pointed by the pointer to ANSWER+0.

- At the end ANSWER+0 will have the Low byte and ANSWER+1 will have High Byte. Move it to 2001H and 2000H respectively.

( Tip: If you search my user page you have a readymade 16 bit add routine that you can use. )

Raghu