diff --git a/src/ca65/expr.c b/src/ca65/expr.c
index cb77d0e1d..e0d15a6fc 100644
--- a/src/ca65/expr.c
+++ b/src/ca65/expr.c
@@ -291,6 +291,23 @@ static ExprNode* BankByte (ExprNode* Operand)
     return Expr;
 }
 
+static ExprNode* TopByte (ExprNode* Operand)
+/* Return the top byte of the given expression */
+{
+    ExprNode* Expr;
+    long      Val;
+
+    /* Special handling for const expressions */
+    if (IsEasyConst (Operand, &Val)) {
+        FreeExpr (Operand);
+        Expr = GenLiteralExpr ((Val >> 24) & 0xFF);
+    } else {
+        /* Extract byte #2 */
+        Expr = NewExprNode (EXPR_BYTE3);
+        Expr->Left = Operand;
+    }
+    return Expr;
+}
 
 
 static ExprNode* LoWord (ExprNode* Operand)
@@ -579,6 +596,11 @@ static ExprNode* FuncLoWord (void)
 }
 
 
+ExprNode* FuncTopByte (void)
+/* Handle the .TOPBYTE builtin function */
+{
+    return TopByte (Expression ());
+}
 
 static ExprNode* DoMatch (enum TC EqualityLevel)
 /* Handle the .MATCH and .XMATCH builtin functions */
@@ -1287,6 +1309,10 @@ static ExprNode* Factor (void)
             NextTok ();
             break;
 
+        case TOK_TOPBYTE:
+            N = Function (FuncTopByte);
+            break;
+
         case TOK_VERSION:
             N = GenLiteralExpr (GetVersionAsNumber ());
             NextTok ();
diff --git a/src/ca65/main.c b/src/ca65/main.c
index c9bb11eb9..01c80fcf0 100644
--- a/src/ca65/main.c
+++ b/src/ca65/main.c
@@ -1275,6 +1275,8 @@ int main (int argc, char* argv [])
     /* Define the default options */
     SetOptions ();
 
+    CreateDefaultSegments ();
+
     /* Assemble the input */
     Assemble ();
 
diff --git a/src/ca65/pseudo.c b/src/ca65/pseudo.c
index 88f609e25..e430ff887 100644
--- a/src/ca65/pseudo.c
+++ b/src/ca65/pseudo.c
@@ -377,7 +377,11 @@ static void DoAddr (void)
             /* Do a range check */
             Expr = GenWordExpr (Expr);
         }
-        EmitWord (Expr);
+        if (GetCPU () == CPU_65C032) {
+            EmitDWord( Expr );
+        } else {
+            EmitWord (Expr);
+        }
         if (CurTok.Tok != TOK_COMMA) {
             break;
         } else {
@@ -2254,6 +2258,7 @@ static CtrlDesc CtrlCmdTab [] = {
     { ccNone,           DoTag           },      /* .TAG */
     { ccNone,           DoUnexpected    },      /* .TCOUNT */
     { ccNone,           DoUnexpected    },      /* .TIME */
+    { ccNone,           DoUnexpected    },      /* .TOPBYTE */
     { ccKeepToken,      DoUnDef         },      /* .UNDEF, .UNDEFINE */
     { ccNone,           DoUnion         },      /* .UNION */
     { ccNone,           DoUnexpected    },      /* .VERSION */
diff --git a/src/ca65/scanner.c b/src/ca65/scanner.c
index ce90388d4..121d2a1e6 100644
--- a/src/ca65/scanner.c
+++ b/src/ca65/scanner.c
@@ -316,6 +316,7 @@ struct DotKeyword {
     { ".TAG",           TOK_TAG                 },
     { ".TCOUNT",        TOK_TCOUNT              },
     { ".TIME",          TOK_TIME                },
+    { ".TOPBYTE",       TOK_TOPBYTE             },
     { ".UNDEF",         TOK_UNDEF               },
     { ".UNDEFINE",      TOK_UNDEF               },
     { ".UNION",         TOK_UNION               },
diff --git a/src/ca65/segment.c b/src/ca65/segment.c
index d5073895d..bf49fb1b5 100644
--- a/src/ca65/segment.c
+++ b/src/ca65/segment.c
@@ -58,6 +58,7 @@
 #include "spool.h"
 #include "studyexpr.h"
 #include "symtab.h"
+#include "cpu.h"
 
 
 
@@ -93,7 +94,22 @@ Segment* ActiveSeg;
 /*                                   Code                                    */
 /*****************************************************************************/
 
+void CreateDefaultSegments(void) {
+    int AddrSizeAbs;
 
+    if (CPU == CPU_65C032) {
+        AddrSizeAbs = 4;
+    } else {
+        AddrSizeAbs = 2;
+    }
+
+    NullSegDef.AddrSize     = AddrSizeAbs;
+    ZeropageSegDef.AddrSize = ADDR_SIZE_ZP;
+    DataSegDef.AddrSize     = AddrSizeAbs;
+    BssSegDef.AddrSize      = AddrSizeAbs;
+    RODataSegDef.AddrSize   = AddrSizeAbs;
+    CodeSegDef.AddrSize     = AddrSizeAbs;
+}
 
 static Segment* NewSegFromDef (SegDef* Def)
 /* Create a new segment from a segment definition. Used only internally, no
diff --git a/src/ca65/segment.h b/src/ca65/segment.h
index 35430739b..6ee0d2fca 100644
--- a/src/ca65/segment.h
+++ b/src/ca65/segment.h
@@ -90,6 +90,8 @@ extern Segment* ActiveSeg;
 /*                                   Code                                    */
 /*****************************************************************************/
 
+void CreateDefaultSegments (void);
+/* Create the default segments, based on the current CPU */
 
 
 Fragment* GenFragment (unsigned char Type, unsigned short Len);
diff --git a/src/ca65/struct.c b/src/ca65/struct.c
index d755aa4bf..6d93a7af8 100644
--- a/src/ca65/struct.c
+++ b/src/ca65/struct.c
@@ -48,6 +48,7 @@
 #include "symbol.h"
 #include "symtab.h"
 #include "struct.h"
+#include "cpu.h"
 
 
 
@@ -175,7 +176,14 @@ static long DoStructInternal (long Offs, unsigned Type)
             case TOK_WORD:
             case TOK_ADDR:
                 NextTok ();
-                MemberSize = Member (2);
+                switch (CPU) {
+                    case CPU_65C032:
+                        MemberSize = Member (4);
+                        break;
+                    default:
+                        MemberSize = Member (2);
+                        break;
+                }
                 break;
 
             case TOK_FARADDR:
diff --git a/src/ca65/token.c b/src/ca65/token.c
index 48ffdff80..7251b4c60 100644
--- a/src/ca65/token.c
+++ b/src/ca65/token.c
@@ -274,6 +274,7 @@ static const TokDescEntry TokDesc[] = {
     { ".TAG"                            },
     { ".TCOUNT"                         },
     { ".TIME"                           },
+    { ".TOPBYTE"                        },
     { ".UNDEF"                          },
     { ".UNION"                          },
     { ".VERSION"                        },
diff --git a/src/ca65/token.h b/src/ca65/token.h
index 34706fad5..534d5be27 100644
--- a/src/ca65/token.h
+++ b/src/ca65/token.h
@@ -280,6 +280,7 @@ typedef enum token_t {
     TOK_TAG,
     TOK_TCOUNT,
     TOK_TIME,
+    TOK_TOPBYTE,
     TOK_UNDEF,
     TOK_UNION,
     TOK_VERSION,
diff --git a/src/common/alignment.h b/src/common/alignment.h
index 8a798facd..fd1a181c4 100644
--- a/src/common/alignment.h
+++ b/src/common/alignment.h
@@ -47,7 +47,7 @@
 /* Maximum possible alignment. Beware: To increase the possible alignment it
 ** is not enough to bump this value. Check the code inside.
 */
-#define MAX_ALIGNMENT   0x10000UL
+#define MAX_ALIGNMENT   0x100000000UL
 
 /* The following value marks what is considered a "large alignment" and worth
 ** a warning if not suppressed.
diff --git a/src/common/cpu.c b/src/common/cpu.c
index 30d8e5787..f1e842748 100644
--- a/src/common/cpu.c
+++ b/src/common/cpu.c
@@ -217,7 +217,7 @@ int ValidAddrSizeForCPU (unsigned char AddrSize)
 
         case ADDR_SIZE_LONG:
             /* "none" supports all sizes */
-            return (CPU == CPU_NONE);
+            return (CPU == CPU_65C032);
 
         default:
             FAIL ("Invalid address size");
diff --git a/src/ld65/config.c b/src/ld65/config.c
index 9536d5c26..6bebba791 100644
--- a/src/ld65/config.c
+++ b/src/ld65/config.c
@@ -731,7 +731,7 @@ static void ParseSegments (void)
 
                 case CFGTOK_OFFSET:
                     FlagAttr (&S->Attr, SA_OFFSET, "OFFSET");
-                    S->Addr   = CfgCheckedConstExpr (0, 0x1000000);
+                    S->Addr   = CfgCheckedConstExpr (0, 0x100000000);
                     S->Flags |= SF_OFFSET;
                     break;
 
@@ -752,7 +752,7 @@ static void ParseSegments (void)
 
                 case CFGTOK_START:
                     FlagAttr (&S->Attr, SA_START, "START");
-                    S->Addr   = CfgCheckedConstExpr (0, 0x1000000);
+                    S->Addr   = CfgCheckedConstExpr (0, 0x100000000);
                     S->Flags |= SF_START;
                     break;
 
@@ -1959,11 +1959,11 @@ unsigned CfgProcess (void)
                     GetString (M->Name));
         }
         M->Size = GetExprVal (M->SizeExpr);
-        if (M->Size >= 0x80000000) {
-            PError (GetSourcePos (M->LI),
-                    "Size of memory area `%s' is negative: %ld",
-                    GetString (M->Name), (long)M->Size);
-        }
+        // if (M->Size >= 0x80000000) {
+        //     PError (GetSourcePos (M->LI),
+        //             "Size of memory area `%s' is negative: %ld",
+        //             GetString (M->Name), (long)M->Size);
+        // }
 
         /* Walk through the segments in this memory area */
         for (J = 0; J < CollCount (&M->SegList); ++J) {
diff --git a/test/asm/opcodes/65c032-opcodes.ref b/test/asm/opcodes/65c032-opcodes.ref
index e69de29bb..3f7016f5c 100644
Binary files a/test/asm/opcodes/65c032-opcodes.ref and b/test/asm/opcodes/65c032-opcodes.ref differ