small tape support + turbo mode tweaks

src/kernal/board_m65/mega65_tape_fast_cpu.s

@@ -0,0 +1,31 @@
+;; #LAYOUT# M65 KERNAL_1 #TAKE
+;; #LAYOUT# *   *        #IGNORE
+
+;
+; Tape helper routine
+;
+; - unlocks VIC-IV
+; - switches CPU to fast processing mode and disables badlines
+; - stores previous VIC_CTRLB in NXTBIN
+;
+
+!ifdef HAS_TAPE {
+
+
+tape_fast_cpu:
+
+	jsr M65_MODEGET
+	bcc @1
+	
+	jsr viciv_unhide
+@1:
+	lda VIC_CTRLB
+	ora #%01000000
+	sta VIC_CTRLB
+	sta NXTBIT
+
+	lda #$00
+	sta MISC_EMU
+
+	rts
+}