Add NES building and adapt example functions

LibMultiSpacc/neslib/split.s

@@ -0,0 +1,41 @@
+
+
+.importzp TEMP, PPU_CTRL_VAR, PPU_CTRL_VAR1, SCROLL_X1
+.import popax
+.include "nes.inc"
+.include "zpvars.inc"
+.export _split
+
+;;void __fastcall__ split(unsigned int x,unsigned int y);
+
+_split:
+
+	jsr popax
+	sta <SCROLL_X1
+	txa
+	and #$01
+	sta <TEMP
+	lda <PPU_CTRL_VAR
+	and #$fc
+	ora <TEMP
+	sta <PPU_CTRL_VAR1
+
+@3:
+
+	bit PPU_STATUS
+	bvs @3
+
+@4:
+
+	bit PPU_STATUS
+	bvc @4
+
+	lda <SCROLL_X1
+	sta PPU_SCROLL
+	lda #0
+	sta PPU_SCROLL
+	lda <PPU_CTRL_VAR1
+	sta PPU_CTRL
+
+	rts
+