added new segment for MEGA65, $C000-$CFFF

src/kernal/board_m65/C000.interop

@@ -0,0 +1 @@
+This particular address is not for interoperability - we had to choose some fixed location for the extended ROM jumptable, beginning of the mapped memory block is just sane.

src/kernal/board_m65/C000.mega65_vectable_kernal_C.s

@@ -0,0 +1,21 @@
+;; #LAYOUT# M65 KERNAL_0 #TAKE-FLOAT
+;; #LAYOUT# M65 KERNAL_C #TAKE
+;; #LAYOUT# *   *        #IGNORE
+
+;
+; Definitions for communication with MEGA65 segment KERNAL_C from KERNAL_0
+;
+
+
+!ifdef SEGMENT_KERNAL_0 {
+
+	; Label definitions
+
+	!addr VKC__m65_scnkey                = $C000 + 2 * 0
+
+} else {
+
+	; Vector table (Open ROMs private!)
+
+	!word $0000
+}