more work towards Mega65 screen support

src/kernal/board_m65/4000.mega65_vectable_kernal_1.s

@@ -23,6 +23,8 @@
 	.label VK1__M65_MODE65             = $4000 + 2 * 9
 	.label VK1__M65_SCRMODEGET         = $4000 + 2 * 10
 	.label VK1__M65_SCRMODESET         = $4000 + 2 * 11
+	.label VK1__M65_CLRSCR             = $4000 + 2 * 12
+	.label VK1__M65_CLRWIN             = $4000 + 2 * 13
 
 #else
 
@@ -61,6 +63,8 @@
 	.word M65_MODE64
 	.word M65_MODE65
 	.word M65_SCRMODEGET
-	.word M65_SCRMODESET	
+	.word M65_SCRMODESET
+	.word M65_CLRSCR	
+	.word M65_CLRWIN	
 
 #endif

src/kernal/board_m65/mega65_redirect_api.s

@@ -9,22 +9,39 @@ M65_MODE64:
 
 	jsr     map_KERNAL_1
 	jsr_ind VK1__M65_MODE64
-	jmp     map_NORMAL
+	bra     m65_api_end
 
 M65_MODE65:
 
 	jsr     map_KERNAL_1
 	jsr_ind VK1__M65_MODE65
-	jmp     map_NORMAL
+	bra     m65_api_end
 
 M65_SCRMODEGET:
 
 	jsr     map_KERNAL_1
 	jsr_ind VK1__M65_SCRMODEGET
-	jmp     map_NORMAL
+	bra     m65_api_end
 
 M65_SCRMODESET:
 
 	jsr     map_KERNAL_1
 	jsr_ind VK1__M65_SCRMODESET
+	bra     m65_api_end
+
+M65_CLRSCR:
+
+	jsr     map_KERNAL_1
+	jsr_ind VK1__M65_CLRSCR
+	bra     m65_api_end
+
+M65_CLRWIN:
+
+	jsr     map_KERNAL_1
+	jsr_ind VK1__M65_CLRWIN
+
+	// FALLTROUGH
+
+m65_api_end:
+
 	jmp     map_NORMAL

src/kernal/board_m65/mega65_redirect_screen.s

@@ -12,4 +12,3 @@ m65_chrout_screen:
 	jsr_ind VK1__m65_chrout_screen
 	jsr     map_NORMAL
 	jmp chrout_done_success
-