diff --git a/boot/common-boot.s b/boot/common-boot.s
index ad57b41..0c2ef6b 100644
--- a/boot/common-boot.s
+++ b/boot/common-boot.s
@@ -3,7 +3,7 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 
 .global _is_alpha, _is_digit, _is_alnum, _is_upper, _is_lower
-.global _write_out, _read_file, _write_error, _put_char, _printi
+.global _write_s, _read_file, _write_error, _write_c, _write_i, _print_i
 .global _get, _memcmp, _memchr, _memmem, _memcpy
 .global _divide_by_zero_error, _exit, _mmap
 .global _strings_index, _string_equal
@@ -175,16 +175,20 @@ _is_alnum:
 	addi sp, sp, 16
 	ret
 
-.type _write_out, @function
-_write_out:
+# Writes a string to the standard output.
+#
+# Parameters:
+# a0 - Length of the string.
+# a1 - String pointer.
+.type _write_s, @function
+_write_s:
 	# Prologue.
 	addi sp, sp, -8
 	sw ra, 4(sp)
 	sw s0, 0(sp)
 	addi s0, sp, 8
 
-	mv a2, a1
-	mv a1, a0
+	mv a2, a0
 	li a0, STDOUT
 	li a7, SYS_WRITE
 	ecall
@@ -244,53 +248,87 @@ _divide_by_zero_error:
     ecall
     ret
 
-# a0 - Whole number.
+# Writes a number to a string buffer.
+#
+# t0 - Local buffer.
 # t1 - Constant 10.
-# a1 - Local buffer.
 # t2 - Current character.
 # t3 - Whether the number is negative.
-.type printi, @function
-_printi:
-    addi sp, sp, -16
-    sw s0, 0(sp)
-    sw ra, 4(sp)
-    addi s0, sp, 16
-    addi t1, zero, 10
-    addi a1, s0, -1
+#
+# Parameters:
+# a0 - Whole number.
+# a1 - Buffer pointer.
+#
+# Sets a0 to the length of the written number.
+.type _print_i, @function
+_print_i:
+    addi sp, sp, -32
+    sw ra, 28(sp)
+    sw s0, 24(sp)
+    addi s0, sp, 32
 
-    addi t3, zero, 0
-    bge a0, zero, .digit10
-    addi t3, zero, 1
-    sub a0, zero, a0
+    li t1, 10
+    addi t0, s0, -9
 
-.digit10:
+    li t3, 0
+    bgez a0, .Lprint_i_digit10
+    li t3, 1
+    neg a0, a0
+
+.Lprint_i_digit10:
     rem t2, a0, t1
     addi t2, t2, '0'
-    sb t2, 0(a1)
+    sb t2, 0(t0)
     div a0, a0, t1
-    addi a1, a1, -1
-    bne zero, a0, .digit10
+    addi t0, t0, -1
+    bne zero, a0, .Lprint_i_digit10
 
-    beq zero, t3, .write_call
+    beq zero, t3, .Lprint_i_write_call
     addi t2, zero, '-'
-    sb t2, 0(a1)
-    addi a1, a1, -1
+    sb t2, 0(t0)
+    addi t0, t0, -1
 
-.write_call:
-    addi a0, zero, 1
-    addi a1, a1, 1
-    sub a2, s0, a1
-    addi a7, zero, 64 # write
-    ecall
+.Lprint_i_write_call:
+	mv a0, a1
+	addi a1, t0, 1
+    sub a2, s0, t0
+	addi a2, a2, -9
+	sw a2, 0(sp)
 
-    lw s0, 0(sp)
-    lw ra, 4(sp)
-    addi sp, sp, 16
+	call _memcpy
+
+	lw a0, 0(sp)
+
+    lw ra, 28(sp)
+    lw s0, 24(sp)
+    addi sp, sp, 32
+    ret
+
+# Writes a number to the standard output.
+#
+# Parameters:
+# a0 - Whole number.
+.type _write_i, @function
+_write_i:
+    addi sp, sp, -32
+    sw ra, 28(sp)
+    sw s0, 24(sp)
+    addi s0, sp, 32
+
+	addi a1, sp, 0
+	call _print_i
+
+	addi a1, sp, 0
+	call _write_s
+
+    lw ra, 28(sp)
+    lw s0, 24(sp)
+    addi sp, sp, 32
     ret
 
 # Writes a character from a0 into the standard output.
-.type _put_char, @function
-_put_char:
+.type _write_c, @function
+_write_c:
 	# Prologue
 	addi sp, sp, -16
 	sw ra, 12(sp)
diff --git a/boot/stage1.s b/boot/stage1.s
index d957af2..8258075 100644
--- a/boot/stage1.s
+++ b/boot/stage1.s
@@ -123,7 +123,7 @@ compile_binary_expression:
 	addi s0, sp, 32
 
 	li a0, 0
-	call _build_expression
+	call compile_expression
 
 	mv a0, s1
 	addi a1, sp, 12
@@ -153,64 +153,64 @@ compile_binary_expression:
 .Lcompile_binary_expression_equal:
 	mv s1, a0 # Skip =.
 	li a0, 1
-	call _build_expression
-	la a0, asm_sub_a0_a1
-	li a1, ASM_SUB_A0_A1_SIZE
-	call _write_out
+	call compile_expression
+	li a0, ASM_SUB_A0_A1_SIZE
+	la a1, asm_sub_a0_a1
+	call _write_s
 
-	la a0, asm_seqz_a0
-	li a1, ASM_SEQZ_A0_SIZE
-	call _write_out
+	li a0, ASM_SEQZ_A0_SIZE
+	la a1, asm_seqz_a0
+	call _write_s
 
 	j .Lcompile_binary_expression_end
 
 .Lcompile_binary_expression_and:
 	mv s1, a0 # Skip &.
 	li a0, 1
-	call _build_expression
-	la a0, asm_and_a0_a1
-	li a1, ASM_AND_A0_A1_SIZE
-	call _write_out
+	call compile_expression
+	li a0, ASM_AND_A0_A1_SIZE
+	la a1, asm_and_a0_a1
+	call _write_s
 
 	j .Lcompile_binary_expression_end
 
 .Lcompile_binary_expression_or:
 	mv s1, a0 # Skip or.
 	li a0, 1
-	call _build_expression
-	la a0, asm_or_a0_a1
-	li a1, ASM_OR_A0_A1_SIZE
-	call _write_out
+	call compile_expression
+	li a0, ASM_OR_A0_A1_SIZE
+	la a1, asm_or_a0_a1
+	call _write_s
 
 	j .Lcompile_binary_expression_end
 
 .Lcompile_binary_expression_plus:
 	mv s1, a0 # Skip +.
 	li a0, 1
-	call _build_expression
-	la a0, asm_add_a0_a1
-	li a1, ASM_ADD_A0_A1_SIZE
-	call _write_out
+	call compile_expression
+	li a0, ASM_ADD_A0_A1_SIZE
+	la a1, asm_add_a0_a1
+	call _write_s
 
 	j .Lcompile_binary_expression_end
 
 .Lcompile_binary_expression_minus:
 	mv s1, a0 # Skip -.
 	li a0, 1
-	call _build_expression
-	la a0, asm_sub_a0_a1
-	li a1, ASM_SUB_A0_A1_SIZE
-	call _write_out
+	call compile_expression
+	li a0, ASM_SUB_A0_A1_SIZE
+	la a1, asm_sub_a0_a1
+	call _write_s
 
 	j .Lcompile_binary_expression_end
 
 .Lcompile_binary_expression_product:
 	mv s1, a0 # Skip *.
 	li a0, 1
-	call _build_expression
-	la a0, asm_mul_a0_a1
-	li a1, ASM_MUL_A0_A1_SIZE
-	call _write_out
+	call compile_expression
+	li a0, ASM_MUL_A0_A1_SIZE
+	la a1, asm_mul_a0_a1
+	call _write_s
 
 	j .Lcompile_binary_expression_end
 
@@ -295,19 +295,21 @@ compile_identifier_expression:
 	call symbol_table_find
 	sw a0, 12(sp)
 
-	mv a0, s1
-	lw a1, 20(sp)
-	call is_local_identifier
-	bnez a0, .Lcompile_identifier_expression_local
+	beqz a0, .Lcompile_identifier_expression_by_name
+	lw t0, 0(a0)
 
+	li t1, INFO_PARAMETER
+	beq t0, t1, .Lcompile_identifier_expression_parameter
+
+	li t1, INFO_LOCAL
+	beq t0, t1, .Lcompile_identifier_expression_local
+
+.Lcompile_identifier_expression_by_name:
 	mv a0, s1
 	lw a1, 20(sp)
 	call is_register_identifier
 	bnez a0, .Lcompile_identifier_expression_saved
 
-	lw t0, 12(sp)
-	bnez t0, .Lcompile_identifier_expression_defined
-
 	# Global identifier.
 	lw t1, 16(sp)
 	li t0, 0x00202c00 # \0,_
@@ -315,16 +317,16 @@ compile_identifier_expression:
 	sw t0, 8(sp)
 	li t0, 0x6120616c # la a
 	sw t0, 4(sp)
-	addi a0, sp, 4
-	li a1, 7
-	call _write_out
+	li a0, 7
+	addi a1, sp, 4
+	call _write_s
 
-	mv a0, s1
-	lw a1, 20(sp)
-	call _write_out
+	lw a0, 20(sp)
+	mv a1, s1
+	call _write_s
 
 	li a0, '\n'
-	call _put_char
+	call _write_c
 
 	lbu a0, (s1)
 	call _is_upper
@@ -340,54 +342,34 @@ compile_identifier_expression:
 	sw t0, 4(sp)
 	li t0, 0x6120776c # lw a
 	sw t0, 0(sp)
-	addi a0, sp, 0
-	li a1, 12
-	call _write_out
+	li a0, 12
+	addi a1, sp, 0
+	call _write_s
 
 	j .Lcompile_identifier_expression_end
 
-.Lcompile_identifier_expression_defined:
+.Lcompile_identifier_expression_parameter:
 	lw t1, 16(sp)
 	li t0, 0x00202c00 # \0,_
 	or t0, t0, t1
 	sw t0, 8(sp)
 	li t0, 0x6120776c # lw a
 	sw t0, 4(sp)
-	addi a0, sp, 4
-	li a1, 7
-	call _write_out
+	li a0, 7
+	addi a1, sp, 4
+	call _write_s
 
 	lw a0, 12(sp)
 	lw a0, 8(a0)
-	call _printi
+	call _write_i
 
-	li t0, 0x29707328 # (sp)
+	li t0, 0x29307328 # (s0)
 	sw t0, 8(sp)
-	addi a0, sp, 8
-	li a1, 4
-	call _write_out
+	li a0, 4
+	addi a1, sp, 8
+	call _write_s
 	li a0, '\n'
-	call _put_char
-
-	j .Lcompile_identifier_expression_end
-
-.Lcompile_identifier_expression_saved:
-	li t0, 0x00202c00 # \0,_
-	lw t1, 16(sp)
-	or t0, t0, t1
-	sw t0, 8(sp)
-	li t0, 0x6120766d # mv a
-	sw t0, 4(sp)
-	addi a0, sp, 4
-	li a1, 7
-	call _write_out
-
-	mv a0, s1
-	lw a1, 20(sp)
-	call _write_out
-
-	li a0, '\n'
-	call _put_char
+	call _write_c
 
 	j .Lcompile_identifier_expression_end
 
@@ -398,28 +380,45 @@ compile_identifier_expression:
 	sw t0, 8(sp)
 	li t0, 0x6120776c # lw a
 	sw t0, 4(sp)
-	addi a0, sp, 4
-	li a1, 7
-	call _write_out
+	li a0, 7
+	addi a1, sp, 4
+	call _write_s
 
-	mv a0, s1
-	lw a1, 20(sp)
-	addi a0, a0, 4 # Skip the "loca" variable prefix.
-	addi a1, a1, -4 # Skip the "loca" variable prefix.
-	call _write_out
+	lw a0, 12(sp)
+	lw a0, 8(a0)
+	call _write_i
 
 	li t0, 0x29707328 # (sp)
 	sw t0, 8(sp)
-	addi a0, sp, 8
-	li a1, 4
-	call _write_out
+	li a0, 4
+	addi a1, sp, 8
+	call _write_s
 	li a0, '\n'
-	call _put_char
+	call _write_c
+
+	j .Lcompile_identifier_expression_end
+
+.Lcompile_identifier_expression_saved:
+	li t0, 0x00202c00 # \0,_
+	lw t1, 16(sp)
+	or t0, t0, t1
+	sw t0, 8(sp)
+	li t0, 0x6120766d # mv a
+	sw t0, 4(sp)
+	li a0, 7
+	addi a1, sp, 4
+	call _write_s
+
+	lw a0, 20(sp)
+	mv a1, s1
+	call _write_s
+
+	li a0, '\n'
+	call _write_c
 
 	j .Lcompile_identifier_expression_end
 
 .Lcompile_identifier_expression_end:
-
 	# Epilogue.
 	lw ra, 28(sp)
 	lw s0, 24(sp)
@@ -429,8 +428,8 @@ compile_identifier_expression:
 # Evalutes an expression and saves the result in a0.
 #
 # a0 - X in aX, the register number to save the result.
-.type _build_expression, @function
-_build_expression:
+.type compile_expression, @function
+compile_expression:
 	# Prologue.
 	addi sp, sp, -48
 	sw ra, 44(sp)
@@ -448,69 +447,47 @@ _build_expression:
 	lw a0, 24(sp)
 
 	li t0, TOKEN_MINUS
-	beq a0, t0, .Lbuild_expression_negate
+	beq a0, t0, .Lcompile_expression_negate
 
 	li t0, TOKEN_AT
-	beq a0, t0, .Lbuild_expression_address
+	beq a0, t0, .Lcompile_expression_address
 
 	li t0, TOKEN_INTEGER
-	beq a0, t0, .Lbuild_expression_literal
+	beq a0, t0, .Lcompile_expression_literal
 
 	lw a0, 32(sp)
 	lbu a0, (a0)
 	li t0, '_'
-	beq a0, t0, .Lbuild_expression_call
+	beq a0, t0, .Lcompile_expression_call
 
 	lw s1, 32(sp)
 	lw a0, 28(sp)
 	lw a1, 36(sp)
 	call compile_identifier_expression
 
-	j .Lbuild_expression_advance
+	j .Lcompile_expression_advance
 
-.Lbuild_expression_negate:
+.Lcompile_expression_negate:
 	lw s1, 20(sp) # Skip the -.
 	mv a0, zero
-	call _build_expression
+	call compile_expression
 
-	la a0, asm_neg_a0
-	li a1, ASM_NEG_A0_SIZE
-	call _write_out
+	li a0, ASM_NEG_A0_SIZE
+	la a1, asm_neg_a0
+	call _write_s
 
-	j .Lbuild_expression_end
+	j .Lcompile_expression_end
 
-.Lbuild_expression_address:
-	lw t1, 36(sp)
-	li t0, 0x20 # _
-	sw t0, 16(sp)
-	li t0, 0x2c707320 # _sp,
-	sw t0, 12(sp)
-	li t0, 0x2c006120 # _a\0,
-	sw t0, 8(sp)
-	sb t1, 10(sp)
-	li t0, 0x69646461 # addi
-	sw t0, 4(sp)
-	addi a0, sp, 4
-	li a1, 13
-	call _write_out
+.Lcompile_expression_address:
+	lw a0, 20(sp)
+	mv s1, a0  # Skip @.
 
-	lw a0, 20(sp) # Skip @.
-	addi a1, sp, 24
-	call lex_next
-	mv s1, a0
+	lw a0, 36(sp)
+	call compile_at_expression
 
-	lw a0, 32(sp)
-	lw a1, 28(sp)
-	addi a0, a0, 4 # Skip the "loca" variable prefix.
-	addi a1, a1, -4 # Skip the "loca" variable prefix.
-	call _write_out
+	j .Lcompile_expression_end
 
-	li a0, '\n'
-	call _put_char
-
-	j .Lbuild_expression_end
-
-.Lbuild_expression_call:
+.Lcompile_expression_call:
 	lw a0, 20(sp)
 	addi a1, sp, 8
 	call lex_next
@@ -520,32 +497,140 @@ _build_expression:
 	lw a1, 28(sp)
 	call compile_call
 
-	j .Lbuild_expression_end
+	j .Lcompile_expression_end
 
-.Lbuild_expression_literal:
+.Lcompile_expression_literal:
 	lw t1, 36(sp)
 	li t0, 0x00202c00 # \0,_
 	or t0, t0, t1
 	sw t0, 16(sp)
 	li t0, 0x6120696c # li a
 	sw t0, 12(sp)
-	addi a0, sp, 12
-	li a1, 7
-	call _write_out
+	li a0, 7
+	addi a1, sp, 12
+	call _write_s
+
+	lw a0, 28(sp)
+	lw a1, 32(sp)
+	call _write_s
+
+	li a0, '\n'
+	call _write_c
+
+	j .Lcompile_expression_advance
+
+.Lcompile_expression_advance:
+	lw s1, 20(sp)
+
+.Lcompile_expression_end:
+	# Epilogue.
+	lw ra, 44(sp)
+	lw s0, 40(sp)
+	addi sp, sp, 48
+	ret
+
+# Expression taking an identifier address.
+#
+# Parameters:
+# a0 - Register number as character
+.type compile_at_expression, @function
+compile_at_expression:
+	# Prologue.
+	addi sp, sp, -48
+	sw ra, 44(sp)
+	sw s0, 40(sp)
+	addi s0, sp, 48
+
+	sw a0, 36(sp)
+
+	mv a0, s1
+	addi a1, sp, 24
+	call lex_next
+	mv s1, a0
+
+	lw a0, 28(sp)
+	lw a1, 32(sp)
+	call symbol_table_find
+	sw a0, 20(sp)
+	lw t0, 0(a0)
+
+	li t1, INFO_PARAMETER
+	beq t0, t1, .Lcompile_at_expression_parameter
+
+	li t1, INFO_LOCAL
+	beq t0, t1, .Lcompile_at_expression_local
+
+	unimp
+
+.Lcompile_at_expression_local:
+	lw a0, 36(sp)
+	li t0, 0x20 # _
+	sw t0, 16(sp)
+	li t0, 0x2c707320 # _sp,
+	sw t0, 12(sp)
+	li t0, 0x2c006120 # _a\0,
+	sw t0, 8(sp)
+	sb a0, 10(sp)
+	li t0, 0x69646461 # addi
+	sw t0, 4(sp)
+	li a0, 13
+	addi a1, sp, 4
+	call _write_s
+
+	lw a0, 20(sp)
+	lw a0, 8(a0)
+	call _write_i
+
+	j .Lcompile_at_expression_end
+
+.Lcompile_at_expression_parameter:
+	lw a0, 36(sp)
+	li t0, 0x20 # _
+	sw t0, 16(sp)
+	li t0, 0x2c307320 # _s0,
+	sw t0, 12(sp)
+	li t0, 0x2c006120 # _a\0,
+	sw t0, 8(sp)
+	sb a0, 10(sp)
+	li t0, 0x69646461 # addi
+	sw t0, 4(sp)
+	li a0, 13
+	addi a1, sp, 4
+	call _write_s
+
+	lw a0, 20(sp)
+	lw a0, 8(a0)
+	call _write_i
+
+	j .Lcompile_at_expression_end
+
+.Lcompile_at_expression_undefined:
+	lw a0, 36(sp)
+	li t0, 0x20 # _
+	sw t0, 16(sp)
+	li t0, 0x2c707320 # _sp,
+	sw t0, 12(sp)
+	li t0, 0x2c006120 # _a\0,
+	sw t0, 8(sp)
+	sb a0, 10(sp)
+	li t0, 0x69646461 # addi
+	sw t0, 4(sp)
+	li a0, 13
+	addi a1, sp, 4
+	call _write_s
 
 	lw a0, 32(sp)
 	lw a1, 28(sp)
-	call _write_out
+	addi a0, a1, -4 # Skip the "loca" variable prefix.
+	addi a1, a0, 4 # Skip the "loca" variable prefix.
+	call _write_s
 
+	j .Lcompile_at_expression_end
+
+.Lcompile_at_expression_end:
 	li a0, '\n'
-	call _put_char
+	call _write_c
 
-	j .Lbuild_expression_advance
-
-.Lbuild_expression_advance:
-	lw s1, 20(sp)
-
-.Lbuild_expression_end:
 	# Epilogue.
 	lw ra, 44(sp)
 	lw s0, 40(sp)
@@ -583,49 +668,48 @@ compile_designator_expression:
 	sw t0, 12(sp)
 	li t0, 0x61207773 # sw a
 	sw t0, 8(sp)
-	addi a0, sp, 8
-	li a1, 7
-	call _write_out
+	li a0, 7
+	addi a1, sp, 8
+	call _write_s
 
-	lw a0, 20(sp)
-	lw a1, 16(sp)
-	addi a0, a0, 4 # Skip the "loca" variable prefix.
-	addi a1, a1, -4 # Skip the "loca" variable prefix.
-	call _write_out
+	lw a0, 16(sp)
+	lw a1, 20(sp)
+	addi a0, a0, -4 # Skip the "loca" variable prefix.
+	addi a1, a1, 4 # Skip the "loca" variable prefix.
+	call _write_s
 
 	li t0, '\n'
 	sw t0, 12(sp)
 	li t0, 0x29707328 # (sp)
 	sw t0, 8(sp)
-	addi a0, sp, 8
-	li a1, 5
-	call _write_out
+	li a0, 5
+	addi a1, sp, 8
+	call _write_s
 
 	j .Lcompile_designator_expression_end
 
 .Lcompile_designator_expression_saved:
 	li t0, 0x20766d # mv_
 	sw t0, 12(sp)
-	addi a0, sp, 12
-	li a1, 3
-	call _write_out
+	li a0, 3
+	addi a1, sp, 12
+	call _write_s
 
-	lw a0, 20(sp)
-	lw a1, 16(sp)
-	call _write_out
+	lw a0, 16(sp)
+	lw a1, 20(sp)
+	call _write_s
 
 	li t0, 0x0a # \n
 	sw t0, 12(sp)
 	li t0, 0x3061202c # , a0
 	sw t0, 8(sp)
-	addi a0, sp, 8
-	li a1, 5
-	call _write_out
+	li a0, 5
+	addi a1, sp, 8
+	call _write_s
 
 	j .Lcompile_designator_expression_end
 
 .Lcompile_designator_expression_end:
-
 	# Epilogue.
 	lw ra, 28(sp)
 	lw s0, 24(sp)
@@ -708,15 +792,15 @@ compile_call:
 
 .Lcompile_call_argument:
 	li a0, 0
-	call _build_expression
+	call compile_expression
 
 	li t0, 0x202c30 # 0,_
 	sw t0, 8(sp)
 	li t0, 0x61207773 # sw a
 	sw t0, 4(sp)
-	addi a0, sp, 4
-	li a1, 7
-	call _write_out
+	li a0, 7
+	addi a1, sp, 4
+	call _write_s
 
 	lw t0, 12(sp) # Argument count for a procedure call.
 
@@ -725,15 +809,15 @@ compile_call:
 	li a0, -4
 	mul a0, t0, a0
 	addi a0, a0, 60
-	call _printi
+	call _write_i
 
 	li t0, '\n'
 	sw t0, 8(sp)
 	li t0, 0x29707328 # (sp)
 	sw t0, 4(sp)
-	addi a0, sp, 4
-	li a1, 5
-	call _write_out
+	li a0, 5
+	addi a1, sp, 4
+	call _write_s
 
 	lbu t0, (s1)
 	li t1, ','
@@ -752,25 +836,25 @@ compile_call:
 .Lcompile_call_restore:
 	# Just go through all a0-a5 registers and read them from stack.
 	# If this stack value contains garbage, the procedure just shouldn't use it.
-	la a0, asm_restore_parameters
-	li a1, ASM_RESTORE_PARAMETERS_SIZE
-	call _write_out
+	li a0, ASM_RESTORE_PARAMETERS_SIZE
+	la a1, asm_restore_parameters
+	call _write_s
 
 .Lcompile_call_perform:
 	li t0, 0x20
 	sw t0, 8(sp)
 	li t0, 0x6c6c6163 # call
 	sw t0, 4(sp)
-	addi a0, sp, 4
-	li a1, 5
-	call _write_out
+	li a0, 5
+	addi a1, sp, 4
+	call _write_s
 
-	lw a0, 20(sp)
-	lw a1, 16(sp)
-	call _write_out
+	lw a0, 16(sp)
+	lw a1, 20(sp)
+	call _write_s
 
 	li a0, '\n'
-	call _put_char
+	call _write_c
 
 	addi s1, s1, 1 # Skip the close paren.
 
@@ -816,9 +900,9 @@ compile_module_declaration:
 	sw s0, 16(sp)
 	addi s0, sp, 24
 
-	la a0, global_start
-	li a1, GLOBAL_START_SIZE
-	call _write_out
+	li a0, GLOBAL_START_SIZE
+	la a1, global_start
+	call _write_s
 
 	# Skip "program".
 	mv a0, s1
@@ -848,9 +932,9 @@ compile_constant_section:
 	bne t0, t1, .Lcompile_constant_section_end
 	mv s1, a0
 
-	la a0, section_rodata
-	li a1, SECTION_RODATA_SIZE
-	call _write_out
+	li a0, SECTION_RODATA_SIZE
+	la a1, section_rodata
+	call _write_s
 
 .Lcompile_constant_section_item:
 	mv a0, s1
@@ -888,30 +972,30 @@ compile_constant:
 	call lex_next # Skip the assignment sign.
 	mv s1, a0
 	# Write identifier the identifier.
-	lw a0, 20(sp)
-	lw a1, 16(sp)
-	call _write_out
+	lw a0, 16(sp)
+	lw a1, 20(sp)
+	call _write_s
 
 	# : .long
 	li t0, 0x20676e6f # ong_
 	sw t0, 4(sp)
 	li t0, 0x6c2e203a # : .l
 	sw t0, 0(sp)
-	mv a0, sp
-	li a1, 8
-	call _write_out
+	li a0, 8
+	mv a1, sp
+	call _write_s
 
 	mv a0, s1
 	addi a1, sp, 12
 	call lex_next
 	mv s1, a0
 
-	lw a0, 20(sp) # Save the literal pointer before advancing it.
-	lw a1, 16(sp) # The literal length.
-	call _write_out
+	lw a0, 16(sp) # The literal length.
+	lw a1, 20(sp) # Save the literal pointer before advancing it.
+	call _write_s
 
 	li a0, '\n'
-	call _put_char
+	call _write_c
 
 	# Epilogue.
 	lw ra, 28(sp)
@@ -936,9 +1020,9 @@ compile_global_section:
 	bne t0, t1, .Lcompile_global_section_end
 	mv s1, a0
 
-	la a0, section_bss
-	li a1, SECTION_BSS_SIZE
-	call _write_out
+	li a0, SECTION_BSS_SIZE
+	la a1, section_bss
+	call _write_s
 
 .Lcompile_global_section_item:
 	mv a0, s1
@@ -987,37 +1071,37 @@ compile_global:
 	mv s1, a0
 
 	# .type identifier, @object
-	la a0, asm_type
-	li a1, ASM_TYPE_SIZE
-	call _write_out
+	li a0, ASM_TYPE_SIZE
+	la a1, asm_type
+	call _write_s
 
-	lw a0, 36(sp)
-	lw a1, 32(sp)
-	call _write_out
+	lw a0, 32(sp)
+	lw a1, 36(sp)
+	call _write_s
 
-	la a0, asm_type_object
-	li a1, ASM_TYPE_OBJECT_SIZE
-	call _write_out
+	li a0, ASM_TYPE_OBJECT_SIZE
+	la a1, asm_type_object
+	call _write_s
 
 	# identifier: .zero size
-	lw a0, 36(sp)
-	lw a1, 32(sp)
-	call _write_out
+	lw a0, 32(sp)
+	lw a1, 36(sp)
+	call _write_s
 
 	li t0, 0x206f7265 # ero_
 	sw t0, 12(sp)
 	li t0, 0x7a2e203a # : .z
 	sw t0, 8(sp)
-	addi a0, sp, 8
-	li a1, 8
-	call _write_out
+	li a0, 8
+	addi a1, sp, 8
+	call _write_s
 
-	lw a0, 24(sp)
-	lw a1, 20(sp)
-	call _write_out
+	lw a0, 20(sp)
+	lw a1, 24(sp)
+	call _write_s
 
 	li a0, '\n'
-	call _put_char
+	call _write_c
 
 	# Epilogue.
 	lw ra, 44(sp)
@@ -1136,7 +1220,8 @@ compile_parameters:
 	sw s0, 40(sp)
 	addi s0, sp, 48
 
-	sw zero, 12(sp) # Parameter offset counter.
+	li t0, -12
+	sw t0, 12(sp) # Parameter offset counter.
 
 	mv a0, s1
 	addi a1, sp, 28
@@ -1173,7 +1258,7 @@ compile_parameters:
 	call symbol_table_insert
 
 	lw t0, 12(sp)
-	addi t0, t0, 4
+	addi t0, t0, -4
 	sw t0, 12(sp)
 
 	# Read the comma between the parameters or a closing paren.
@@ -1185,7 +1270,7 @@ compile_parameters:
 	li t1, TOKEN_COMMA
 	bne t0, t1, .Lcompile_parameters_end
 	# If it is a comma, read the name of the next parameter.
-	addi a1, sp, 16
+	addi a1, sp, 28
 	call lex_next
 	mv s1, a0
 
@@ -1217,7 +1302,12 @@ compile_procedure:
 
 	lw a0, 16(sp)
 	lw a1, 20(sp)
-	call _write_procedure_head
+	call write_procedure_head
+
+	/* DEBUG */
+	lw a0, 20(sp)
+	lw a1, 16(sp)
+	call _write_error
 
 	# Save the state of the symbol table before we enter the procedure scope.
 	la t0, symbol_table
@@ -1234,36 +1324,23 @@ compile_procedure:
 	mv s1, a0
 
 	# Generate the procedure prologue with a predefined stack size.
-	la a0, prologue
-	li a1, PROLOGUE_SIZE
-	call _write_out
+	li a0, PROLOGUE_SIZE
+	la a1, prologue
+	call _write_s
 
 	# Save passed arguments on the stack.
-	la a0, asm_preserve_parameters
-	li a1, ASM_PRESERVE_PARAMETERS_SIZE
-	call _write_out
+	li a0, ASM_PRESERVE_PARAMETERS_SIZE
+	la a1, asm_preserve_parameters
+	call _write_s
 
 	# Generate the body of the procedure.
 	call compile_statements
 	mv s1, a0 # Skip end.
 
 	# Generate the procedure epilogue with a predefined stack size.
-	la a0, epilogue
-	li a1, EPILOGUE_SIZE
-	call _write_out
-
-	/* DEBUG
-	lw a0, 16(sp)
-	lw a1, 20(sp)
-	call symbol_table_find
-	beqz a0, .x
-*/
-	lw a0, 20(sp)
-	lw a1, 16(sp)
-	call _write_error
-
-	call symbol_table_dump
-	/* DEBUG */
+	li a0, EPILOGUE_SIZE
+	la a1, epilogue
+	call _write_s
 
 	# Restore the symbol table, removing symbols local to this procedure.
 	la t0, symbol_table
@@ -1296,16 +1373,16 @@ compile_goto:
 
 	li t0, 0x2e206a # j .
 	sw t0, 12(sp)
-	addi a0, sp, 12
-	li a1, 3
-	call _write_out
+	li a0, 3
+	addi a1, sp, 12
+	call _write_s
 
-	lw a0, 8(sp) # Saved dot position.
-	lw a1, 4(sp)
-	call _write_out
+	lw a0, 4(sp)
+	lw a1, 8(sp) # Saved dot position.
+	call _write_s
 
 	li a0, '\n'
-	call _put_char
+	call _write_c
 
 	# Epilogue.
 	lw ra, 28(sp)
@@ -1330,14 +1407,14 @@ compile_label:
 	mv s1, a0
 
 	li a0, '.'
-	call _put_char
-	lw a0, 16(sp)
-	lw a1, 12(sp)
-	call _write_out
+	call _write_c
+	lw a0, 12(sp)
+	lw a1, 16(sp)
+	call _write_s
 	li a0, ':'
-	call _put_char
+	call _write_c
 	li a0, '\n'
-	call _put_char
+	call _write_c
 
 	# Epilogue.
 	lw ra, 28(sp)
@@ -1398,35 +1475,35 @@ compile_if:
 	li t0, 0x62626262 # bbbb
 	sb t0, 11(sp)
 
-	addi a0, sp, 11
-	li a1, 13
-	call _write_out
+	li a0, 13
+	addi a1, sp, 11
+	call _write_s
 
 	# Write the label counter.
 	mv a0, s2
-	call _printi
+	call _write_i
 
 	li a0, '\n'
-	call _put_char
+	call _write_c
 
 	call compile_statements
 	mv s1, a0 # Skip end.
 
 	# Write the label prefix.
-	addi a0, sp, 20
-	li a1, 4
-	call _write_out
+	li a0, 4
+	addi a1, sp, 20
+	call _write_s
 
 	# Write the label counter.
 	mv a0, s2
-	call _printi
+	call _write_i
 
 	# Finalize the label.
 	li t0, 0x0a3a # :\n
 	sh t0, 16(sp)
-	addi a0, sp, 16
-	li a1, 2
-	call _write_out
+	li a0, 2
+	addi a1, sp, 16
+	call _write_s
 
 	addi s2, s2, 1 # Increment the label counter.
 
@@ -1443,8 +1520,8 @@ compile_if:
 # Parameters:
 # a0 - Identifier length.
 # a0 - Identifier pointer.
-.type _write_procedure_head, @function
-_write_procedure_head:
+.type write_procedure_head, @function
+write_procedure_head:
 	# Prologue.
 	addi sp, sp, -32
 	sw ra, 28(sp)
@@ -1455,27 +1532,27 @@ _write_procedure_head:
 	sw a1, 20(sp)
 
 	# .type identifier, @function
-	la a0, asm_type
-	li a1, ASM_TYPE_SIZE
-	call _write_out
+	li a0, ASM_TYPE_SIZE
+	la a1, asm_type
+	call _write_s
 
-	lw a0, 20(sp)
-	lw a1, 16(sp)
-	call _write_out
+	lw a0, 16(sp)
+	lw a1, 20(sp)
+	call _write_s
 
-	la a0, asm_type_function
-	li a1, ASM_TYPE_FUNCTION_SIZE
-	call _write_out
+	li a0, ASM_TYPE_FUNCTION_SIZE
+	la a1, asm_type_function
+	call _write_s
 
-	lw a0, 20(sp)
-	lw a1, 16(sp)
-	call _write_out
+	lw a0, 16(sp)
+	lw a1, 20(sp)
+	call _write_s
 
 	li t0, 0x0a3a # :\n
 	sw t0, 12(sp)
-	addi a0, sp, 12
-	li a1, 2
-	call _write_out
+	li a0, 2
+	addi a1, sp, 12
+	call _write_s
 
 	# Epilogue.
 	lw ra, 28(sp)
@@ -1592,9 +1669,9 @@ compile_text_section:
 	sw s0, 8(sp)
 	addi s0, sp, 16
 
-	la a0, section_text
-	li a1, SECTION_TEXT_SIZE
-	call _write_out
+	li a0, SECTION_TEXT_SIZE
+	la a1, section_text
+	call _write_s
 
 	# Epilogue.
 	lw ra, 12(sp)
@@ -1611,9 +1688,9 @@ compile_entry_point:
 	addi s0, sp, 32
 
 	# .type _start, @function
-	la a0, asm_start
-	li a1, ASM_START_SIZE
-	call _write_out
+	li a0, ASM_START_SIZE
+	la a1, asm_start
+	call _write_s
 
 	mv a0, s1
 	addi a1, sp, 4
@@ -1624,9 +1701,9 @@ compile_entry_point:
 	call compile_statements
 	mv s1, a0 # Skip end.
 
-	la a0, asm_exit
-	li a1, ASM_EXIT_SIZE
-	call _write_out
+	li a0, ASM_EXIT_SIZE
+	la a1, asm_exit
+	call _write_s
 
 	# Epilogue.
 	lw ra, 28(sp)
diff --git a/boot/stage2.elna b/boot/stage2.elna
index 6c11543..59bb42a 100644
--- a/boot/stage2.elna
+++ b/boot/stage2.elna
@@ -22,9 +22,9 @@ var
 	loca0: Word
 	loca4: Word
 	loca8: Word
+	loca12: ^Byte
 	loca16: Word
 	loca20: Word
-	loca12: ^Byte
 	loca24: Bool
 begin
 	_build_expression(0);
@@ -79,16 +79,16 @@ begin
 	_build_expression(1);
 
 	loca0 := 0x627573;
-	_write_out(@loca0, 3);
-	_write_out(@loca4, 4);
-	_write_out(@loca4, 4);
-	_write_out(@loca8, 4);
+	_write_s(3, @loca0);
+	_write_s(4, @loca4);
+	_write_s(4, @loca4);
+	_write_s(4, @loca8);
 
 	loca0 := 0x7a716573;
-	_write_out(@loca0, 4);
-	_write_out(@loca4, 4);
-	_write_out(@loca4, 3);
-	_put_char(0x0a);
+	_write_s(4, @loca0);
+	_write_s(4, @loca4);
+	_write_s(3, @loca4);
+	_write_c(0x0a);
 
 	goto .Lbuild_binary_expression_end;
 
@@ -96,10 +96,10 @@ begin
 	_advance(1);
 	_build_expression(1);
 	loca0 := 0x646e61;
-	_write_out(@loca0, 3);
-	_write_out(@loca4, 4);
-	_write_out(@loca4, 4);
-	_write_out(@loca8, 4);
+	_write_s(3, @loca0);
+	_write_s(4, @loca4);
+	_write_s(4, @loca4);
+	_write_s(4, @loca8);
 
 	goto .Lbuild_binary_expression_end;
 
@@ -107,10 +107,10 @@ begin
 	_advance(2);
 	_build_expression(1);
 	loca0 := 0x726f;
-	_write_out(@loca0, 2);
-	_write_out(@loca4, 4);
-	_write_out(@loca4, 4);
-	_write_out(@loca8, 4);
+	_write_s(2, @loca0);
+	_write_s(4, @loca4);
+	_write_s(4, @loca4);
+	_write_s(4, @loca8);
 
 	goto .Lbuild_binary_expression_end;
 
@@ -118,10 +118,10 @@ begin
 	_advance(1);
 	_build_expression(1);
 	loca0 := 0x646461;
-	_write_out(@loca0, 3);
-	_write_out(@loca4, 4);
-	_write_out(@loca4, 4);
-	_write_out(@loca8, 4);
+	_write_s(3, @loca0);
+	_write_s(4, @loca4);
+	_write_s(4, @loca4);
+	_write_s(4, @loca8);
 
 	goto .Lbuild_binary_expression_end;
 
@@ -129,10 +129,10 @@ begin
 	_advance(1);
 	_build_expression(1);
 	loca0 := 0x627573;
-	_write_out(@loca0, 3);
-	_write_out(@loca4, 4);
-	_write_out(@loca4, 4);
-	_write_out(@loca8, 4);
+	_write_s(3, @loca0);
+	_write_s(4, @loca4);
+	_write_s(4, @loca4);
+	_write_s(4, @loca8);
 
 	goto .Lbuild_binary_expression_end;
 
@@ -140,10 +140,10 @@ begin
 	_advance(1);
 	_build_expression(1);
 	loca0 := 0x6c756d;
-	_write_out(@loca0, 3);
-	_write_out(@loca4, 4);
-	_write_out(@loca4, 4);
-	_write_out(@loca8, 4);
+	_write_s(3, @loca0);
+	_write_s(4, @loca4);
+	_write_s(4, @loca4);
+	_write_s(4, @loca8);
 
 	goto .Lbuild_binary_expression_end;
 
@@ -151,6 +151,15 @@ begin
 end
 
 proc _compile_identifier_expression(loca84: Word, loca80: Byte)
+var
+	loca0: Word
+	loca4: ^Byte
+	loca8: Word
+	loca12: Bool
+	loca16: Word
+	loca20: Word
+	loca24: ^Byte
+	loca28: Byte
 begin
 	loca24 := _current();
 	loca0 := 0x61636f6c;
@@ -158,17 +167,17 @@ begin
 
 	if loca0 = 0 then
 		loca8 := 0x6120776c;
-		_write_out(@loca8, 4);
+		_write_s(4, @loca8);
 		loca8 := 0x00202c00 or loca80;
-		_write_out(@loca8, 3);
+		_write_s(3, @loca8);
 
 		loca4 := loca24 + 4;
 		loca0 := loca84 - 4;
-		_write_out(loca4, loca0);
+		_write_s(loca0, loca4);
 
 		loca8 := 0x29707328;
-		_write_out(@loca8, 4);
-		_put_char(0x0a);
+		_write_s(4, @loca8);
+		_write_c(0x0a);
 
 		goto .Lcompile_identifier_expression_end
 	end;
@@ -177,32 +186,32 @@ begin
 	loca12 := loca0 = 0x73;
 	if loca8 & loca12 then
 		loca8 := 0x6120766d;
-		_write_out(@loca8, 4);
+		_write_s(4, @loca8);
 		loca8 := 0x00202c00 or loca80;
-		_write_out(@loca8, 3);
-		_write_out(loca24, loca84);
-		_put_char(0x0a);
+		_write_s(3, @loca8);
+		_write_s(loca84, loca24);
+		_write_c(0x0a);
 
 		goto .Lcompile_identifier_expression_end
 	end;
 
 	loca8 := 0x6120616c;
-	_write_out(@loca8, 4);
+	_write_s(4, @loca8);
 	loca8 := 0x00202c00 or loca80;
-	_write_out(@loca8, 3);
+	_write_s(3, @loca8);
 
-	_write_out(loca24, loca84);
-	_put_char(0x0a);
+	_write_s(loca84, loca24);
+	_write_c(0x0a);
 
 	if _is_upper(loca0) then
 		loca8 := 0x6120776c;
-		_write_out(@loca8, 4);
+		_write_s(4, @loca8);
 		loca8 := 0x28202c00 or loca28;
-		_write_out(@loca8, 4);
-		_put_char(0x61);
-		_put_char(loca28);
-		_put_char(0x29);
-		_put_char(0x0a);
+		_write_s(4, @loca8);
+		_write_c(0x61);
+		_write_c(loca28);
+		_write_c(0x29);
+		_write_c(0x0a);
 
 		goto .Lcompile_identifier_expression_end
 	end;
@@ -210,14 +219,16 @@ begin
 	.Lcompile_identifier_expression_end
 end
 
-proc _build_expression()
+proc _build_expression(loca84: Word)
 var
 	loca0: Word
-	loca20: Word
-	loca28: Word
-	loca8: Word
-	loca24: ^Byte
 	loca4: ^Byte
+	loca8: Word
+	loca12: Word
+	loca16: Word
+	loca20: Word
+	loca24: ^Byte
+	loca28: Word
 begin
 	loca28 := loca84 + 0x30;
 
@@ -250,24 +261,24 @@ begin
 	_build_expression(0);
 
 	loca8 := 0x2067656e;
-	_write_out(@loca8, 4);
+	_write_s(4, @loca8);
 	loca8 := 0x202c3061;
-	_write_out(@loca8, 4);
+	_write_s(4, @loca8);
 	loca8 := 0x0a3061;
-	_write_out(@loca8, 3);
+	_write_s(3, @loca8);
 
 	goto .Lbuild_expression_advance;
 
 	.Lbuild_expression_address;
 	loca8 := 0x69646461;
-	_write_out(@loca8, 4);
+	_write_s(4, @loca8);
 	loca8 := 0x6120;
-	_write_out(@loca8, 2);
-	_put_char(loca28);
+	_write_s(2, @loca8);
+	_write_c(loca28);
 	loca8 := 0x7073202c;
-	_write_out(@loca8, 4);
+	_write_s(4, @loca8);
 	loca8 := 0x202c;
-	_write_out(@loca8, 2);
+	_write_s(2, @loca8);
 
 	_advance(1);
 	_skip_spaces();
@@ -276,9 +287,9 @@ begin
 
 	loca4 := loca24 + 4;
 	loca0 := loca20 - 4;
-	_write_out(loca4, loca0);
+	_write_s(loca0, loca4);
 
-	_put_char(0xa);
+	_write_c(0xa);
 
 	goto .Lbuild_expression_advance;
 
@@ -291,12 +302,12 @@ begin
 
 	.Lbuild_expression_literal;
 	loca8 := 0x6120696c;
-	_write_out(@loca8, 4);
+	_write_s(4, @loca8);
 	loca8 := 0x00202c00 or loca28;
-	_write_out(@loca8, 3);
+	_write_s(3, @loca8);
 
-	_write_out(loca24, loca20);
-	_put_char(0x0a);
+	_write_s(loca20, loca24);
+	_write_c(0x0a);
 
 	goto .Lbuild_expression_advance;
 
@@ -309,23 +320,27 @@ end
 proc _compile_designator_expression(loca84: ^Byte, loca80: Word)
 var
 	loca0: Word
+	loca4: Int
+	loca8: Char
+	loca12: Bool
+	loca16: Bool
 begin
 	loca0 := 0x61636f6c;
 	loca4 := _memcmp(@loca0, loca84, 4);
 
 	if loca4 = 0 then
 		loca0 := 0x61207773;
-		_write_out(@loca0, 4);
+		_write_s(4, @loca0);
 		loca0 := 0x202c30;
-		_write_out(@loca0, 3);
+		_write_s(3, @loca0);
 
 		loca84 := loca84 + 4;
 		loca80 := loca80 - 4;
-		_write_out(loca84, loca80);
+		_write_s(loca80, loca84);
 
 		loca0 := 0x29707328;
-		_write_out(@loca0, 4);
-		_put_char(0x0a);
+		_write_s(4, @loca0);
+		_write_c(0x0a);
 
 		goto .Lcompile_designator_expression_end
 	end;
@@ -334,11 +349,11 @@ begin
 	loca16 := loca80 = 2;
 	if loca12 & loca16 then
 		loca0 := 0x20766d;
-		_write_out(@loca0, 3);
-		_write_out(loca84, loca80);
+		_write_s(3, @loca0);
+		_write_s(loca80, loca84);
 		loca0 := 0x3061202c;
-		_write_out(@loca0, 4);
-		_put_char(0x0a);
+		_write_s(4, @loca0);
+		_write_c(0x0a);
 
 		goto .Lcompile_designator_expression_end
 	end;
@@ -349,11 +364,11 @@ end
 proc _compile_identifier()
 var
 	loca0: Word
-	loca16: Word
-	loca8: Word
-	loca20: ^Byte
-	loca12: ^Byte
 	loca4: Bool
+	loca8: Word
+	loca12: ^Byte
+	loca16: Word
+	loca20: ^Byte
 begin
 	loca20 := _current();
 	loca16 := _read_token();
@@ -388,8 +403,8 @@ proc _compile_call(loca84: ^Byte, loca80: Word)
 var
 	loca0: Word
 	loca4: Word
-	loca12: Word
 	loca8: ^Byte
+	loca12: Word
 begin
 	loca12 := 0;
 
@@ -404,17 +419,17 @@ begin
 	_build_expression(0);
 
 	loca0 := 0x61207773;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x202c30;
-	_write_out(@loca0, 3);
+	_write_s(3, @loca0);
 
 	loca0 := -4 * loca12;
 	loca0 := loca0 + 60;
-	_printi(loca0);
+	_write_i(loca0);
 
 	loca0 := 0x29707328;
-	_write_out(@loca0, 4);
-	_put_char(0x0a);
+	_write_s(4, @loca0);
+	_write_c(0x0a);
 
 	_skip_spaces();
 	loca8 := _current();
@@ -434,60 +449,60 @@ begin
 	.Lcompile_call_restore;
 
 	loca0 := 0x6120776c;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x36202c30;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x70732830;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x0a29;
-	_write_out(@loca4, 2);
+	_write_s(2, @loca4);
 
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x35202c31;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x70732836;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x0a29;
-	_write_out(@loca4, 2);
+	_write_s(2, @loca4);
 
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x35202c32;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x70732832;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x0a29;
-	_write_out(@loca4, 2);
+	_write_s(2, @loca4);
 
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x34202c33;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x70732838;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x0a29;
-	_write_out(@loca4, 2);
+	_write_s(2, @loca4);
 
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x34202c34;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x70732834;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x0a29;
-	_write_out(@loca4, 2);
+	_write_s(2, @loca4);
 
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x34202c35;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x70732830;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca4 := 0x0a29;
-	_write_out(@loca4, 2);
+	_write_s(2, @loca4);
 
 	loca0 := 0x6c6c6163;
-	_write_out(@loca0, 4);
-	_put_char(0x20);
+	_write_s(4, @loca0);
+	_write_c(0x20);
 
-	_write_out(loca84, loca80);
-	_put_char(0x0a);
+	_write_s(loca80, loca84);
+	_write_c(0x0a);
 
 	_skip_spaces();
 	_advance(1)
@@ -623,10 +638,10 @@ var loca0: ^Byte
 begin
 	loca0 := _current();
 
-	_write_out(loca0, loca84);
+	_write_s(loca84, loca0);
 	_advance(loca84);
 
-	_put_char(0xa);
+	_write_c(0xa);
 
 	_advance(1)
 end
@@ -635,13 +650,13 @@ proc _compile_program()
 var loca0: Word
 begin
 	loca0 := 0x6f6c672e;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x206c6162;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x6174735f;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a7472;
-	_write_out(@loca0, 3);
+	_write_s(3, @loca0);
 
 	_advance(8)
 end
@@ -652,15 +667,15 @@ var
 	loca4: ^Byte
 begin
 	loca0 := 0x6365732e;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x6e6f6974;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x6f722e20;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x61746164;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a;
-	_write_out(@loca0, 1);
+	_write_s(1, @loca0);
 
 	_advance(6);
 
@@ -685,25 +700,25 @@ begin
 	loca4 := _read_token();
 	loca8 := _current();
 
-	_write_out(loca8, loca4);
+	_write_s(loca4, loca8);
 	_advance(loca4);
 
 	_skip_spaces();
 	_advance(2);
 
 	loca0 := 0x6c2e203a;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x20676e6f;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 
 	_skip_spaces();
 	loca4 := _read_token();
 	loca8 := _current();
 
-	_write_out(loca8, loca4);
+	_write_s(loca4, loca8);
 	_advance(loca4);
 
-	_put_char(0x0a)
+	_write_c(0x0a)
 end
 
 proc _compile_variable_section()
@@ -712,13 +727,13 @@ var
 	loca4: ^Byte
 begin
 	loca0 := 0x6365732e;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x6e6f6974;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x73622e20;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a73;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
 	_advance(4);
 
@@ -740,11 +755,14 @@ end
 
 proc _compile_variable()
 var
-	loca28: ^Byte
-	loca16: ^Byte
 	loca0: Word
-	loca24: Word
+	loca4: Word
+	loca8: Word
+	loca12: Word
+	loca16: ^Byte
 	loca20: Word
+	loca24: Word
+	loca28: ^Byte
 begin
 	loca24 := _read_token();
 	loca28 := _current();
@@ -769,42 +787,42 @@ begin
 	_advance(loca0);
 
 	loca0 := 0x7079742e;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x2065;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
-	_write_out(loca28, loca24);
+	_write_s(loca24, loca28);
 
 	loca0 := 0x6f40202c;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x63656a62;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a74;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
 	loca0 := 0x7a69732e;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x2065;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
-	_write_out(loca28, loca24);
+	_write_s(loca24, loca28);
 
 	loca0 := 0x202c;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
-	_write_out(loca20, loca16);
-	_put_char(0x0a);
+	_write_s(loca16, loca20);
+	_write_c(0x0a);
 
-	_write_out(loca28, loca24);
+	_write_s(loca24, loca28);
 
 	loca0 := 0x7a2e203a;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x206f7265;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 
-	_write_out(loca20, loca16);
+	_write_s(loca16, loca20);
 
-	_put_char(0x0a)
+	_write_c(0x0a)
 end
 
 proc _compile_procedure()
@@ -823,23 +841,23 @@ begin
 	_advance(loca16);
 
 	loca0 := 0x7079742e;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x2065;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
-	_write_out(loca20, loca16);
+	_write_s(loca16, loca20);
 
 	loca0 := 0x6640202c;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x74636e75;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a6e6f69;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 
-	_write_out(loca20, loca16);
+	_write_s(loca16, loca20);
 
 	loca0 := 0x0a3a;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
 	_skip_spaces();
 	_advance(1);
@@ -862,85 +880,85 @@ begin
 	end;
 
 	loca0 := 0x69646461;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 
 	loca0 := 0x2c707320;
-	_write_out(@loca0, 4);
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
+	_write_s(4, @loca0);
 
 	loca0 := 0x0a36392d;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 
 	loca0 := 0x72207773;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x39202c61;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x70732832;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a29;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
 	loca0 := 0x73207773;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x38202c30;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x70732838;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a29;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
 	loca0 := 0x69646461;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x2c307320;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x2c707320;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a363920;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 
 	loca0 := 0x61207773;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x38202c30;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca8 := 0x70732834;
-	_write_out(@loca8, 4);
+	_write_s(4, @loca8);
 	loca12 := 0x0a29;
-	_write_out(@loca12, 2);
+	_write_s(2, @loca12);
 
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x38202c31;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca8 := 0x70732830;
-	_write_out(@loca8, 4);
-	_write_out(@loca12, 2);
+	_write_s(4, @loca8);
+	_write_s(2, @loca12);
 
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x37202c32;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca8 := 0x70732836;
-	_write_out(@loca8, 4);
-	_write_out(@loca12, 2);
+	_write_s(4, @loca8);
+	_write_s(2, @loca12);
 
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x37202c33;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca8 := 0x70732832;
-	_write_out(@loca8, 4);
-	_write_out(@loca12, 2);
+	_write_s(4, @loca8);
+	_write_s(2, @loca12);
 
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x36202c34;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca8 := 0x70732838;
-	_write_out(@loca8, 4);
-	_write_out(@loca12, 2);
+	_write_s(4, @loca8);
+	_write_s(2, @loca12);
 
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca4 := 0x36202c35;
-	_write_out(@loca4, 4);
+	_write_s(4, @loca4);
 	loca8 := 0x70732838;
-	_write_out(@loca8, 4);
-	_write_out(@loca12, 2);
+	_write_s(4, @loca8);
+	_write_s(2, @loca12);
 
 	.Lcompile_procedure_body;
 	_skip_spaces();
@@ -960,43 +978,43 @@ begin
 	_advance(4);
 
 	loca0 := 0x7220776c;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x39202c61;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x70732832;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a29;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
 	loca0 := 0x7320776c;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x38202c30;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x70732838;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a29;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
 	loca0 := 0x69646461;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 
 	loca0 := 0x2c707320;
-	_write_out(@loca0, 4);
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
+	_write_s(4, @loca0);
 
 	loca0 := 0x0a3639;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 
 	loca0 := 0x0a746572;
-	_write_out(@loca0, 4)
+	_write_s(4, @loca0)
 end
 
 proc _token_compare(loca84: ^Byte, loca80: Word, loca76: ^Byte)
 var
 	loca0: Bool
 	loca4: Byte
-	loca12: Byte
 	loca8: Word
+	loca12: Byte
 begin
 	.Ltoken_compare_loop;
 	loca4 := _front(loca76);
@@ -1038,12 +1056,13 @@ end
 proc _compile_goto()
 var
 	loca0: Word
+	loca4: Word
 	loca8: ^Byte
 begin
 	_advance(4);
 
 	loca0 := 0x206a;
-	_write_out(@loca0, 2);
+	_write_s(2, @loca0);
 
 	_skip_spaces();
 	loca8 := _current();
@@ -1052,15 +1071,16 @@ begin
 	loca0 := _read_token();
 	_advance(loca0);
 	loca0 := loca0 + 1;
-	_write_out(loca8, loca0);
+	_write_s(loca0, loca8);
 
 	_advance(1);
-	_put_char(0x0a)
+	_write_c(0x0a)
 end
 
 proc _compile_label(loca84: Word)
 var
 	loca0: Word
+	loca4: Word
 begin
 	loca0 := _current();
 
@@ -1072,10 +1092,10 @@ begin
 	if loca0 = 0x3b then
 		loca4 := loca4 - 1
 	end;
-	_write_out(s1, loca4);
+	_write_s(loca4, s1);
 
-	_put_char(0x3a);
-	_put_char(0x0a);
+	_write_c(0x3a);
+	_write_c(0x0a);
 
 	_advance(loca84)
 end
@@ -1089,11 +1109,12 @@ end
 
 proc _compile_if()
 var
+	loca0: Word
+	loca4: ^Byte
 	loca8: Word
 	loca12: Word
 	loca16: Word
 	loca20: Word
-	loca4: ^Byte
 begin
 	_advance(2);
 	_skip_spaces();
@@ -1107,15 +1128,15 @@ begin
 	loca16 := 0x66694c2e;
 
 	loca12 := 0x7a716562;
-	_write_out(@loca12, 4);
+	_write_s(4, @loca12);
 	loca12 := 0x2c306120;
-	_write_out(@loca12, 4);
-	_put_char(0x20);
+	_write_s(4, @loca12);
+	_write_c(0x20);
 
-	_write_out(@loca16, 4);
-	_printi(s2);
+	_write_s(4, @loca16);
+	_write_i(s2);
 
-	_put_char(0x0a);
+	_write_c(0x0a);
 
 	.Lcompile_if_loop;
 	_skip_spaces();
@@ -1131,11 +1152,11 @@ begin
 		goto .Lcompile_if_loop
 	end;
 
-	_write_out(@loca16, 4);
-	_printi(s2);
+	_write_s(4, @loca16);
+	_write_i(s2);
 
 	loca12 := 0x0a3a0a3a;
-	_write_out(@loca12, 2);
+	_write_s(2, @loca12);
 
 	s2 := s2 + 1;
 	_advance(4)
@@ -1316,34 +1337,34 @@ proc _compile_text_section()
 var loca0: Word
 begin
 	loca0 := 0x6365732e;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x6e6f6974;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x65742e20;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a7478;
-	_write_out(@loca0, 3)
+	_write_s(3, @loca0)
 end
 
 proc _compile_entry_point()
 var loca0: Word
 begin
 	loca0 := 0x7079742e;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x735f2065;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x74726174;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x6640202c;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x74636e75;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a6e6f69;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x6174735f;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a3a7472;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 
 	_advance(6)
 end
@@ -1352,19 +1373,19 @@ proc _compile_exit()
 var loca0: Word
 begin
 	loca0 := 0x6120696c;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x30202c30;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x20696c0a;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x202c3761;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x650a3339;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x6c6c6163;
-	_write_out(@loca0, 4);
+	_write_s(4, @loca0);
 	loca0 := 0x0a;
-	_write_out(@loca0, 1);
+	_write_s(1, @loca0);
 
 	_advance(4);
 	_skip_spaces()
diff --git a/boot/test.elna b/boot/test.elna
index f4ce4c5..3b7a962 100644
--- a/boot/test.elna
+++ b/boot/test.elna
@@ -1,14 +1,11 @@
 program
 
-proc _main(x: Word)
-var loca0: Word
-loca4: Word
+proc _main(x: Word, y: Word)
 begin
-	loca0 := 0x0a2c3061;
-	loca4 := x;
-	_write_out(@loca4, 4)
+	_write_s(@x, 4);
+	_write_s(@y, 4)
 end
 
 begin
-	_main()
+	_main(0x0a2c3061, 0x0a2c3062)
 end.