moved RAMTAS to Mega65 extra ROM, as a proof of concept

c64/kernal/banking/mega65_map_helpers.s

@@ -0,0 +1,56 @@
+// #LAYOUT# M65 KERNAL_0 #TAKE
+// #LAYOUT# *   *        #IGNORE
+
+//
+// ROM mapping routines for Mega65
+//
+
+// Available memory maps:
+// - NORMAL   - nothing mapped in
+// - KERNAL_1 - for calling KERNAL_1 segment code
+
+
+map_NORMAL:
+
+	php
+	pha
+	phx
+	phy
+	phz
+
+	lda #$00
+	tax
+	tay
+	taz
+
+	// FALLTROUGH
+
+map_end:
+
+	map
+	eom
+
+	plz
+	ply
+	plx
+	pla
+	plp
+
+	rts
+
+
+map_KERNAL_1:
+
+	php
+	pha
+	phx
+	phy
+	phz
+
+	lda #$00
+	tay
+	taz
+
+	ldx #$42    // 0x4000 <- map 8KB from 0x20000
+
+	bne map_end