diff --git a/.gitignore b/.gitignore
index c0d5c50..21f6ef7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /GSCats.xcodeproj/xcuserdata/qd.xcuserdatad/xcschemes/GSCats.xcscheme
 /gscats.lst
+/GSCats.xcodeproj/xcuserdata/qd.xcuserdatad/xcdebugger
diff --git a/GSCats.xcodeproj/project.pbxproj b/GSCats.xcodeproj/project.pbxproj
index 47bd992..8daa1a2 100644
--- a/GSCats.xcodeproj/project.pbxproj
+++ b/GSCats.xcodeproj/project.pbxproj
@@ -10,6 +10,8 @@
 		700C39C51F2E5CA800C24F9C /* trigtables.s */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.asm; path = trigtables.s; sourceTree = "<group>"; };
 		706DF1641F2D39F700AA6680 /* loader.s */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.asm; path = loader.s; sourceTree = "<group>"; };
 		706DF1651F2D4A8100AA6680 /* terrain.s */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.asm; path = terrain.s; sourceTree = "<group>"; };
+		7088096C1F2EA4B200D4C950 /* spanRender.s */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.asm; path = spanRender.s; sourceTree = "<group>"; };
+		7088096D1F2ECE8D00D4C950 /* GenerateRenderSpans.py */ = {isa = PBXFileReference; lastKnownFileType = text.script.python; path = GenerateRenderSpans.py; sourceTree = "<group>"; };
 		70E9D85F1F2BD95400555C19 /* equates.s */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.asm; path = equates.s; sourceTree = "<group>"; };
 		70E9D8601F2BD95400555C19 /* graphics.s */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.asm; path = graphics.s; sourceTree = "<group>"; };
 		70E9D8611F2BD95400555C19 /* gscats.s */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.asm; path = gscats.s; sourceTree = "<group>"; };
@@ -26,9 +28,11 @@
 				70E9D8621F2BD95400555C19 /* macros.s */,
 				706DF1641F2D39F700AA6680 /* loader.s */,
 				706DF1651F2D4A8100AA6680 /* terrain.s */,
+				7088096C1F2EA4B200D4C950 /* spanRender.s */,
 				700C39C51F2E5CA800C24F9C /* trigtables.s */,
 				70E9D8611F2BD95400555C19 /* gscats.s */,
 				70E9D8631F2BD95400555C19 /* Makefile */,
+				7088096D1F2ECE8D00D4C950 /* GenerateRenderSpans.py */,
 			);
 			sourceTree = "<group>";
 		};
diff --git a/GenerateRenderSpans.py b/GenerateRenderSpans.py
new file mode 100755
index 0000000..d7edee6
--- /dev/null
+++ b/GenerateRenderSpans.py
@@ -0,0 +1,32 @@
+#!/usr/bin/python
+
+import sys,os,png
+import argparse
+
+
+def main(argv):
+
+	# Prologue
+	print ";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;"
+	print "; spanRenderers"
+	print ";"
+	print "; Automatically generated by GenerateRenderSpans.py. Do not edit."
+	print ";\nrenderSpamJumpTable:"
+
+	for jump in range(0,80):
+		print "\t.word renderSpan%d" % (jump+1)
+	
+	print "\n"
+
+	for span in range(1,81):
+		print "renderSpan%d:" % span
+
+		bytes = "\t.byte "
+		for byte in range(0,span-1):
+			bytes += "$5a,"
+		bytes += "$5a\n\tjmp renderSpanComplete\n"
+		print bytes
+
+if __name__ == "__main__":
+	main(sys.argv[1:])
+	
diff --git a/graphics.s b/graphics.s
index ae20319..7b09809 100644
--- a/graphics.s
+++ b/graphics.s
@@ -2,6 +2,7 @@
 ; colorFill
 ; Fills the screen with a color (or two). Pretty fast, but not fastest possible
 ; A 4:4:4:4 = Palette entries
+; X = Color to fill (doubled)
 ;
 ; Trashes Y
 
diff --git a/gscats.2mg b/gscats.2mg
index 3ff0bb8..1e1f0a1 100644
Binary files a/gscats.2mg and b/gscats.2mg differ
diff --git a/gscats.s b/gscats.s
index c67a809..0858848 100644
--- a/gscats.s
+++ b/gscats.s
@@ -33,7 +33,9 @@ mainBank2:
 
 mainGameLoop:
 	ldy mapScrollPos
-	jsr renderTerrainColumns
+;	jsr renderTerrainColumns
+
+	jsr renderTerrain
 
 	jsr kbdScan
 
diff --git a/spanRender.s b/spanRender.s
new file mode 100644
index 0000000..c1807d9
--- /dev/null
+++ b/spanRender.s
@@ -0,0 +1,408 @@
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; spanRenderers
+;
+; Automatically generated by GenerateRenderSpans.py. Do not edit.
+;
+renderSpamJumpTable:
+	.word renderSpan1
+	.word renderSpan2
+	.word renderSpan3
+	.word renderSpan4
+	.word renderSpan5
+	.word renderSpan6
+	.word renderSpan7
+	.word renderSpan8
+	.word renderSpan9
+	.word renderSpan10
+	.word renderSpan11
+	.word renderSpan12
+	.word renderSpan13
+	.word renderSpan14
+	.word renderSpan15
+	.word renderSpan16
+	.word renderSpan17
+	.word renderSpan18
+	.word renderSpan19
+	.word renderSpan20
+	.word renderSpan21
+	.word renderSpan22
+	.word renderSpan23
+	.word renderSpan24
+	.word renderSpan25
+	.word renderSpan26
+	.word renderSpan27
+	.word renderSpan28
+	.word renderSpan29
+	.word renderSpan30
+	.word renderSpan31
+	.word renderSpan32
+	.word renderSpan33
+	.word renderSpan34
+	.word renderSpan35
+	.word renderSpan36
+	.word renderSpan37
+	.word renderSpan38
+	.word renderSpan39
+	.word renderSpan40
+	.word renderSpan41
+	.word renderSpan42
+	.word renderSpan43
+	.word renderSpan44
+	.word renderSpan45
+	.word renderSpan46
+	.word renderSpan47
+	.word renderSpan48
+	.word renderSpan49
+	.word renderSpan50
+	.word renderSpan51
+	.word renderSpan52
+	.word renderSpan53
+	.word renderSpan54
+	.word renderSpan55
+	.word renderSpan56
+	.word renderSpan57
+	.word renderSpan58
+	.word renderSpan59
+	.word renderSpan60
+	.word renderSpan61
+	.word renderSpan62
+	.word renderSpan63
+	.word renderSpan64
+	.word renderSpan65
+	.word renderSpan66
+	.word renderSpan67
+	.word renderSpan68
+	.word renderSpan69
+	.word renderSpan70
+	.word renderSpan71
+	.word renderSpan72
+	.word renderSpan73
+	.word renderSpan74
+	.word renderSpan75
+	.word renderSpan76
+	.word renderSpan77
+	.word renderSpan78
+	.word renderSpan79
+	.word renderSpan80
+
+
+renderSpan1:
+	.byte $5a
+	jmp renderSpanComplete
+
+renderSpan2:
+	.byte $5a,$5a
+	jmp renderSpanComplete
+
+renderSpan3:
+	.byte $5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan4:
+	.byte $5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan5:
+	.byte $5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan6:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan7:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan8:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan9:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan10:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan11:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan12:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan13:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan14:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan15:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan16:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan17:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan18:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan19:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan20:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan21:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan22:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan23:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan24:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan25:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan26:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan27:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan28:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan29:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan30:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan31:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan32:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan33:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan34:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan35:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan36:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan37:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan38:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan39:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan40:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan41:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan42:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan43:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan44:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan45:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan46:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan47:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan48:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan49:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan50:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan51:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan52:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan53:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan54:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan55:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan56:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan57:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan58:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan59:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan60:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan61:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan62:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan63:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan64:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan65:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan66:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan67:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan68:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan69:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan70:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan71:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan72:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan73:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan74:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan75:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan76:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan77:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan78:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan79:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
+renderSpan80:
+	.byte $5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a,$5a
+	jmp renderSpanComplete
+
diff --git a/terrain.s b/terrain.s
index 89cb4a5..889194d 100644
--- a/terrain.s
+++ b/terrain.s
@@ -95,11 +95,92 @@ renderTerrainColumnsDone:
 	rts
 
 
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; renderTerrain
+;
+; No stack operations permitted here!
+;
+renderTerrain:
+	FASTGRAPHICS
+
+	lda #$9d00-1	; Point stack to end of VRAM
+	tcs
+
+	jmp renderSpanChain
+
+renderSpanChainComplete:
+
+	SLOWGRAPHICS
+	rts
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; renderSpanChain
+;
+; Trashes all registers
+; No stack operations permitted here!
+;
+
+renderSpanChain:
+	stz spanChainIndex
+
+renderSpanChainLoop:
+	ldx spanChainIndex
+	ldy spanChain+2,x
+	lda spanChain,x
+	beq renderSpanChainComplete
+	dec
+	asl
+	tax
+	jmp (renderSpamJumpTable,x)
+
+renderSpanComplete:
+	inc spanChainIndex
+	inc spanChainIndex
+	inc spanChainIndex
+	inc spanChainIndex
+	bra renderSpanChainLoop
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; renderSpan
+;
+; No stack operations permitted here!
+;
+;
+;renderSpan:
+;	ldy spanParams+2
+;	lda spanParams
+;	dec
+;	asl
+;	tax
+;	jmp (renderSpamJumpTable,x)
+
+
+
+
+spanChain:
+	.word 20,$1111		; Length,Colors
+	.word 40,$0000		; Length,Colors
+	.word 10,$1111		; Length,Colors
+	.word 2,$0000		; Length,Colors
+	.word 1,$1111		; Length,Colors
+	.word 0,0		; Length,Colors
+	.word 0,0		; Length,Colors
+	.word 0,0		; Length,Colors
+	.word 0,0		; Length,Colors
+	.word 0,0		; Length,Colors
+	.word 0
+
+spanChainIndex:
+	.word 0
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ; generateTerrain
 ;
 ; Trashes A and Y
 ;
+
 generateTerrain:
 	ldy #0
 	lda #terrainData
@@ -123,6 +204,8 @@ generateTerrainLoop:
 	rts
 
 
+.include "spanRender.s"
+
 ; Terrain data, stored as height values 4 pixels wide
 
 terrainData: