nes: Expose and document all joypad keys

[cc65] / doc / nes.sgml

diff --git a/doc/nes.sgml b/doc/nes.sgml
index ae8e4a9719fd12c3d0765b53021302110cb22aa1..98c25b6af934faebfab7f4bf3446f8f5fde2433b 100644 (file)
--- a/doc/nes.sgml
+++ b/doc/nes.sgml
@@ -123,6 +123,14 @@ No extended memory drivers are currently available for the NES.
 
 </descrip><p>
 
+The generic interface doesn't export the start and select buttons. To
+test for those, use the defines in nes.h instead of the generic masks.
+
+Example:
+<tscreen><verb>
+if (joy_read(0) & KEY_A)
+</verb></tscreen>
+
 
 <sect1>Mouse drivers<p>