diff --git a/SourceGen/AsmGen/AsmAcme.cs b/SourceGen/AsmGen/AsmAcme.cs
index 9eefc9e..7667bbf 100644
--- a/SourceGen/AsmGen/AsmAcme.cs
+++ b/SourceGen/AsmGen/AsmAcme.cs
@@ -523,19 +523,28 @@ namespace SourceGen.AsmGen {
 
         // IGenerator
         public void OutputOrgDirective(int offset, int address) {
-            // For the first one, set the "real" PC.  For all subsequent directives, set the
-            // "pseudo" PC.
+            // If there's only one address range, just set the "real" PC.  If there's more
+            // than one we can run out of space if the source file has a chunk in high memory
+            // followed by a chunk in low memory, because the "real" PC determines when the
+            // 64KB bank is overrun.
             if (offset == 0) {
-                OutputLine("*", "=", SourceFormatter.FormatHexValue(address, 4), string.Empty);
-            } else {
-                if (mInPseudoPcBlock) {
-                    // close previous block
-                    OutputLine(string.Empty, CLOSE_PSEUDOPC, string.Empty, string.Empty);
+                // first one
+                if (Project.AddrMap.Count == 1) {
+                    OutputLine("*", "=", SourceFormatter.FormatHexValue(address, 4), string.Empty);
+                    return;
+                } else {
+                    // set the real PC to address zero to ensure we get a full 64KB
+                    OutputLine("*", "=", SourceFormatter.FormatHexValue(0, 4), string.Empty);
                 }
-                OutputLine(string.Empty, sDataOpNames.OrgDirective,
-                    SourceFormatter.FormatHexValue(address, 4) + " {", string.Empty);
-                mInPseudoPcBlock = true;
             }
+
+            if (mInPseudoPcBlock) {
+                // close previous block
+                OutputLine(string.Empty, CLOSE_PSEUDOPC, string.Empty, string.Empty);
+            }
+            OutputLine(string.Empty, sDataOpNames.OrgDirective,
+                SourceFormatter.FormatHexValue(address, 4) + " {", string.Empty);
+            mInPseudoPcBlock = true;
         }
 
         // IGenerator
diff --git a/SourceGen/SGTestData/Expected/2004-numeric-types_acme.S b/SourceGen/SGTestData/Expected/2004-numeric-types_acme.S
index 69ed4b0..5912ce9 100644
--- a/SourceGen/SGTestData/Expected/2004-numeric-types_acme.S
+++ b/SourceGen/SGTestData/Expected/2004-numeric-types_acme.S
@@ -1,7 +1,8 @@
 ;Project file was edited to get all big-endian data types, and to have an
 ;incorrect .junk alignment directive.
         !cpu    6502
-*       =       $1000
+*       =       $0000
+        !pseudopc $1000 {
         bit     L1448
         jsr     L14A8
         nop
@@ -60,6 +61,7 @@ LABEL   !hex    00112233445566778899aabbccddeeff00112233445566778899aabbccddeeff
         !fill   2,$dd      ;incorrect alignment
         !align  255,0,$00
         !fill   8,$82
+        } ;!pseudopc
         !pseudopc $1408 {
         !fill   8,$82      ;note no-op .ORG
         !fill   8,$83
diff --git a/SourceGen/SGTestData/Expected/2007-labels-and-symbols_acme.S b/SourceGen/SGTestData/Expected/2007-labels-and-symbols_acme.S
index f766091..85e248c 100644
--- a/SourceGen/SGTestData/Expected/2007-labels-and-symbols_acme.S
+++ b/SourceGen/SGTestData/Expected/2007-labels-and-symbols_acme.S
@@ -1,5 +1,6 @@
 ;ACME can't handle 65816 code that lives outside bank zero
-*       =       $012345
+*       =       $0000
+        !pseudopc $012345 {
         !hex    18fbe230a9cda9dda90da9eda9fea92da9ffa929a910a9e9a90fa945a923a901
         !hex    f4edfef44523f40100f45634f41200f4edfef44523f40100f45634f41200a5ce
         !hex    adce00afce0000adecfeafecfe00adeefeafeefe00ad4623af462301ad4423af
@@ -22,3 +23,4 @@
         !hex    656172206f6e20746865206669727374206c696e652e20205468652071756963
         !hex    6b2062726f776e20666f78206a756d7073206f76657220746865206c617a7920
         !hex    646f67732ea97aa959a934c230a97b56a95a34a9341260
+        } ;!pseudopc
diff --git a/SourceGen/SGTestData/Expected/2008-address-changes_acme.S b/SourceGen/SGTestData/Expected/2008-address-changes_acme.S
index 92ab9c3..2baae7f 100644
--- a/SourceGen/SGTestData/Expected/2008-address-changes_acme.S
+++ b/SourceGen/SGTestData/Expected/2008-address-changes_acme.S
@@ -1,5 +1,6 @@
         !cpu    65816
-*       =       $1000
+*       =       $0000
+        !pseudopc $1000 {
         !as
         !rs
         clc
@@ -9,6 +10,7 @@
         jsr     L1107
         jmp     L2000
 
+        } ;!pseudopc
         !pseudopc $1100 {
 L1100   bit     L1100
 L1103   lda     #$11
diff --git a/SourceGen/SGTestData/Expected/2009-branches-and-banks_acme.S b/SourceGen/SGTestData/Expected/2009-branches-and-banks_acme.S
index dd06c38..e175d1e 100644
--- a/SourceGen/SGTestData/Expected/2009-branches-and-banks_acme.S
+++ b/SourceGen/SGTestData/Expected/2009-branches-and-banks_acme.S
@@ -1,6 +1,8 @@
 ;ACME can't handle 65816 code that lives outside bank zero
-*       =       $1000
+*       =       $0000
+        !pseudopc $1000 {
         !hex    18fbe2304c00002c0000a500a503d0ba30b862b5ff7006826d00000102a51482
         !hex    a5ff2c80005c0000442cc0ff823d00cf000044af000044ad0000a50030f562b2
         !hex    ffd0b082a9ff1700170044cfc0ff44f005303c8239005c0020002c0020f41700
         !hex    f44400d003dc1300ea201220201520200f202256341260
+        } ;!pseudopc
diff --git a/SourceGen/SGTestData/Expected/2010-target-adjustment_acme.S b/SourceGen/SGTestData/Expected/2010-target-adjustment_acme.S
index 8b907b0..a5e15f2 100644
--- a/SourceGen/SGTestData/Expected/2010-target-adjustment_acme.S
+++ b/SourceGen/SGTestData/Expected/2010-target-adjustment_acme.S
@@ -1,5 +1,6 @@
         !cpu    65816
-*       =       $1000
+*       =       $0000
+        !pseudopc $1000 {
         !as
         !rs
 load11  lda     #$11
@@ -48,6 +49,7 @@ load11  lda     #$11
 
         !byte   $80
 @dat81  !byte   $81
+        } ;!pseudopc
         !pseudopc $2000 {
 @L2000  !byte   $82
         !byte   $83
diff --git a/SourceGen/SGTestData/Expected/2014-label-dp_acme.S b/SourceGen/SGTestData/Expected/2014-label-dp_acme.S
index 1c0befd..a42e645 100644
--- a/SourceGen/SGTestData/Expected/2014-label-dp_acme.S
+++ b/SourceGen/SGTestData/Expected/2014-label-dp_acme.S
@@ -1,6 +1,7 @@
 ;6502bench SourceGen v1.1.0-dev1
         !cpu    65816
-*       =       $1000
+*       =       $0000
+        !pseudopc $1000 {
         !as
         !rs
         sec
@@ -286,6 +287,7 @@ L11FC   cmp+2   L0086,x
         sbc+2   L0086,x
         inc+2   L0086,x
         sbc+3   L0089,x
+        } ;!pseudopc
         !pseudopc $0080 {
 L0080   bit+1   @L0082
 @L0082  bit+1   @L0082
diff --git a/SourceGen/SGTestData/Expected/2019-local-variables_acme.S b/SourceGen/SGTestData/Expected/2019-local-variables_acme.S
index f755693..228e817 100644
--- a/SourceGen/SGTestData/Expected/2019-local-variables_acme.S
+++ b/SourceGen/SGTestData/Expected/2019-local-variables_acme.S
@@ -5,7 +5,8 @@ CONST_ZERO =    $f0        ;project const
 PROJ_ZERO =     $00        ;project addr
 PROJ_ONE =      $01        ;project addr
 
-*       =       $1000
+*       =       $0000
+        !pseudopc $1000 {
         !as
         !rs
         ldy     PROJ_ZERO
@@ -187,6 +188,7 @@ L103C   lda     #$fe
         jsr     DPCODE
         rts
 
+        } ;!pseudopc
         !pseudopc $0080 {
 DPCODE  nop
         lda+1   DPCODE
diff --git a/SourceGen/SGTestData/Expected/2022-extension-scripts_acme.S b/SourceGen/SGTestData/Expected/2022-extension-scripts_acme.S
index a34f758..9426863 100644
--- a/SourceGen/SGTestData/Expected/2022-extension-scripts_acme.S
+++ b/SourceGen/SGTestData/Expected/2022-extension-scripts_acme.S
@@ -3,7 +3,8 @@ PrintInlineL1String = $011000
 PrintInlineL2String = $012000
 PrintInlineDciString = $013000
 
-*       =       $1000
+*       =       $0000
+        !pseudopc $1000 {
         !as
         !rs
         clc
@@ -92,6 +93,7 @@ Next1   jsr     L10BA
 
         !fill   300,$00
 
+        } ;!pseudopc
         !pseudopc $1800 {
 L1800   jsr     PrintInlineNullString
         per     $8778
diff --git a/SourceGen/SGTestData/Expected/2024-ui-edge-cases_acme.S b/SourceGen/SGTestData/Expected/2024-ui-edge-cases_acme.S
index b714551..e5abe21 100644
--- a/SourceGen/SGTestData/Expected/2024-ui-edge-cases_acme.S
+++ b/SourceGen/SGTestData/Expected/2024-ui-edge-cases_acme.S
@@ -1,8 +1,10 @@
         !cpu    6502
-*       =       $2000
+*       =       $0000
+        !pseudopc $2000 {
         jmp     L2100
 
         !text   "hello, "  ;string should be split by no-op addr change
+        } ;!pseudopc
         !pseudopc $200a {
         !text   "world"
         !byte   $80