Updated the cx16 library to the ROM's prerelease 36.

libsrc/cx16/get_numbanks.s

@@ -0,0 +1,20 @@
+;
+; 2020-01-10, Greg King
+;
+; unsigned char get_numbanks (void);
+; /* Return the number of RAM banks that the machine has. */
+;
+; The Commander X16 version of MEMTOP returns with an extra value:
+; The accumulator describes the number of RAM banks that exist on the hardware.
+;
+
+        .export         _get_numbanks
+
+        .import         MEMTOP
+
+
+_get_numbanks:
+        sec
+        jsr     MEMTOP
+        ldx     #>$0000
+        rts