diff --git a/assembler.rb b/assembler.rb
index cde3e97..8c5a10d 100644
--- a/assembler.rb
+++ b/assembler.rb
@@ -23,6 +23,7 @@ end
 
 
 # # # REGISTER NAMES # # #
+def r0() 0 end # zero
 def at() 1 end # assembler temporary
 
 # subroutine return values, may be changed by subroutines
@@ -120,6 +121,25 @@ def sw(src, offset, dest)
 	word op
 end
 
+# add immediate unsigned
+def addiu(src, val, dest)
+	#      oooooo sssss ddddd iiiiiiii iiiiiiii
+	op = 0b001001_00000_00000_00000000_00000000
+	op |= (src & 0b11111) << 21
+	op |= (val & 0xffff)
+	op |= (dest & 0b11111) << 16
+	word op
+end
+
+# add immediate
+def addi(src, val, dest)
+	#      oooooo sssss ddddd iiiiiiii iiiiiiii
+	op = 0b001000_00000_00000_00000000_00000000
+	op |= (src & 0b11111) << 21
+	op |= (val & 0xffff)
+	op |= (dest & 0b11111) << 16
+	word op
+end
 
 
 # # # PSEUDO-INSTRUCTIONS # # #
@@ -208,17 +228,28 @@ def line(st, en)
 	sw t1, 0, t0
 end
 
-l_end_loop = label
+# l_end_loop = label
 line 0x0010_0010, 0x0030_0030
 line 0x0030_0030, 0x0060_0000
-line 0x0060_0000, 0x00f0_0060
+line 0x0060_000a, 0x00f0_0060
 
 nop ; nop ; nop ; nop
 nop ; nop ; nop ; nop
 nop ; nop ; nop ; nop
 nop ; nop ; nop ; nop
 
-# l_end_loop = label
+l_end_loop = label
+
+addiu r0, -10, t3
+#addiu t3, 6, t3
+addiu t3, -10, t3
+nop
+
+addi r0, -10, t4
+#addi t4, 6, t4
+addi t4, -10, t4
+nop
+
 nop
 jmp l_end_loop
 nop
@@ -228,12 +259,8 @@ nop
 
 
 
-
-string "this is a test lol"
-
-
-
-
+puts "assembled 0x#{$bytes.length.to_s 16} (#{$bytes.length}) bytes"
+raise "CODE IS GREATER THAN FILESIZE" if $bytes.length > $file_size
 zero_fill $file_size - 1
 
 f = File.new "LOADTHIS.EXE", "wb"