CLS/Fade out ASM Sub-routine

[boriel]

Good one!
No, it won't break anything (only IX should be preserved (push/pop) before the function returns).
Also, it's recommended to make your labels private. To do so:
Wrap your ASM routine between

Code:

PROC
...
ENDP

directives.
Declare your labels locals after PROC, with:
LOCAL NXTFADE, NXT
:-)

If your code is BSD / MIT / Apache I can put it in the standard library for other people to use it.