diff --git a/projects/examples/dev.console.usm b/projects/examples/dev.console.usm
index d132dfc..ef84a75 100644
--- a/projects/examples/dev.console.usm
+++ b/projects/examples/dev.console.usm
@@ -2,6 +2,14 @@
 
 %RTN { JMP2r }
 
+( devices )
+
+|10 @Console    [ &pad $8 &char $1 ]
+
+( variables )
+
+|0000
+
 ( program )
 
 |0100
@@ -22,6 +30,3 @@ RTN
 
 @hello-word [ 48 65 6c 6c 6f 20 57 6f 72 6c 64 21 ]
 
-( devices )
-
-|ff10 @Console    [ &pad $8 &char $1 ]
diff --git a/projects/examples/dev.controller.buttons.usm b/projects/examples/dev.controller.buttons.usm
index 8af463e..91e920f 100644
--- a/projects/examples/dev.controller.buttons.usm
+++ b/projects/examples/dev.controller.buttons.usm
@@ -6,8 +6,17 @@
 %=>SC/ADDR { .Screen/addr IOW2 }
 %->SC/COLR { .Screen/color IOW }
 
+( devices )
+
+|00 @System     [ &vector $2 &pad    $6 &r      $2 &g     $2 &b      $2 ]
+|10 @Console    [ &pad    $8 &char   $1 &byte   $1 &short $2 &string $2 ]
+|20 @Screen     [ &vector $2 &width  $2 &height $2 &pad   $2 &x      $2 &y $2 &addr $2 &color $1 ]
+|40 @Controller [ &vector $2 &button $1 &key    $1 ]
+
 ( variables )
 
+|0000
+
 @slime $1
 
 |0100
@@ -78,9 +87,3 @@ BRK
 @right_icn   [ 3c7e f7f8 f8f7 7e3c ]
 @slime_icn   [ 0000 183c 3c18 0000 ]
 
-( devices )
-
-|ff00 @System     [ &vector $2 &pad    $6 &r      $2 &g     $2 &b      $2 ]
-|ff10 @Console    [ &pad    $8 &char   $1 &byte   $1 &short $2 &string $2 ]
-|ff20 @Screen     [ &vector $2 &width  $2 &height $2 &pad   $2 &x      $2 &y $2 &addr $2 &color $1 ]
-|ff40 @Controller [ &vector $2 &button $1 &key    $1 ]
diff --git a/projects/examples/dev.file.usm b/projects/examples/dev.file.usm
index becbc39..3352e40 100644
--- a/projects/examples/dev.file.usm
+++ b/projects/examples/dev.file.usm
@@ -16,6 +16,19 @@
 
 %MEMORY { #1000 }
 
+( devices )
+
+|00 @System     [ &vector $2 &pad    $6 &r      $2 &g     $2 &b      $2 ]
+|10 @Console    [ &pad    $8 &char   $1 &byte   $1 &short $2 &string $2 ]
+|20 @Screen     [ &vector $2 &width  $2 &height $2 &pad   $2 &x      $2 &y $2 &addr $2 &color $1 ]
+|40 @Controller [ &vector $2 &button $1 &key    $1 ]
+|60 @Mouse      [ &vector $2 &x $2 &y $2 &state $1 &chord $1 ]
+|70 @File       [ &vector $2 &success $2 &offset $2 &pad $2 &name $2 &length $2 &load $2 &save $2 ]
+
+( variables )
+
+|0000
+
 @loadbtn [ &x $2 &y $2 ]
 @output [ &x $2 &y $2 ]
 @pointer [ &x $2 &y $2 ]
@@ -192,11 +205,3 @@ RTN
 	0000 0032 4c00 0000 3c42 99a1 a199 423c
 ]
 
-( devices )
-
-|ff00 @System     [ &vector $2 &pad    $6 &r      $2 &g     $2 &b      $2 ]
-|ff10 @Console    [ &pad    $8 &char   $1 &byte   $1 &short $2 &string $2 ]
-|ff20 @Screen     [ &vector $2 &width  $2 &height $2 &pad   $2 &x      $2 &y $2 &addr $2 &color $1 ]
-|ff40 @Controller [ &vector $2 &button $1 &key    $1 ]
-|ff60 @Mouse      [ &vector $2 &x $2 &y $2 &state $1 &chord $1 ]
-|ff70 @File       [ &vector $2 &success $2 &offset $2 &pad $2 &name $2 &length $2 &load $2 &save $2 ]
diff --git a/src/assembler.c b/src/assembler.c
index 2b9ab40..76fd081 100644
--- a/src/assembler.c
+++ b/src/assembler.c
@@ -286,8 +286,6 @@ pass1(FILE *f)
 	while(fscanf(f, "%s", w) == 1) {
 		if(skipblock(w, &ccmnt, '(', ')')) continue;
 		if(w[0] == '|') {
-			if(shex(w + 1) < addr)
-				return error("Memory Overwrite", w);
 			addr = shex(w + 1);
 		} else if(w[0] == '%') {
 			if(!makemacro(w + 1, f))
@@ -322,6 +320,8 @@ pass2(FILE *f)
 		if(skipblock(w, &ccmnt, '(', ')')) continue;
 		if(skipblock(w, &ctemplate, '{', '}')) continue;
 		if(w[0] == '|') {
+			if(p.length && shex(w + 1) < p.ptr)
+				return error("Memory Overwrite", w);
 			p.ptr = shex(w + 1);
 			continue;
 		} else if(w[0] == '$') {