A tiny synthetic HP41 challenge

[Dieter]

(12-08-2016 08:34 PM)hth Wrote:  If you have 0 as input and you append the 999 exponent at the end, then RCL M will put a non-normalized number in X?

Ah, OK, that's of course correct. But the next operation or a STO/RCL should normalize it.
You can also do it within the routine. For instance by adding zero, like it's done in "MT" of the PPC ROM:

Code:

CLA
ABS
STO M
ASTO M
ASTO M
ASTO M
>"\x00\x09\x99"
CLX
ST+ M
X<> M
CLA
END

Still including a final CLA for cleanup. ;-)

Dieter