safer reset routine for MEGA65

src/kernal/board_m65/mega65_imports.s

@@ -41,6 +41,7 @@
 .label viciv_hotregs_on                = KERNAL_0.viciv_hotregs_on
 .label viciv_hotregs_off               = KERNAL_0.viciv_hotregs_off
 
+.label m65_clr_magictstr               = KERNAL_0.m65_clr_magictstr
 .label m65_scrtab_txtwidth             = KERNAL_0.m65_scrtab_txtwidth
 .label m65_scrtab_txtheight            = KERNAL_0.m65_scrtab_txtheight
 .label m65_screen_set_indx             = KERNAL_0.m65_screen_set_indx

src/kernal/board_m65/mega65_reset_part.s

@@ -0,0 +1,26 @@
+// #LAYOUT# M65 KERNAL_0 #TAKE
+// #LAYOUT# *   *        #IGNORE
+
+// MEGA65 specific part of the hardware
+
+
+m65_reset_part:
+
+	jsr map_NORMAL           // we want normal memory mapping
+	jsr viciv_shutdown       // by default we do not want the VIC-IV
+
+	jsr M65_MODEGET
+	bcs !+
+
+	// Clear MEAGA65 native mode mark, it might cause confusion
+	
+m65_clr_magictstr: // entry point for mode switching routine
+
+	lda #$00
+	sta M65_MAGICSTR+0
+	sta M65_MAGICSTR+1
+	sta M65_MAGICSTR+2
+
+	// FALLTROUGH
+!:
+	rts