diff --git a/Changes b/Changes
index b949dba1e..1495898e0 100644
--- a/Changes
+++ b/Changes
@@ -15,6 +15,8 @@ The contributors that suggested a given feature are shown in []. Thanks!
 
 ***   Fix genblk naming with directly nested generate blocks, #2176. [Alexander Grobman]
 
+****  Implement $displayb/o/h, $writeb/o/h, etc, #1637.
+
 ****  Use gcc -Os in examples instead of -O2 for better average performance.
 
 ****  Fix undeclared VL_SHIFTR_WWQ, #2114. [Alex Solomatnikov]
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index 7365d6430..b7ab752a8 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -2956,17 +2956,21 @@ public:
 class AstSFormatF : public AstNode {
     // Convert format to string, generally under an AstDisplay or AstSFormat
     // Also used as "real" function for /*verilator sformat*/ functions
-    string      m_text;
-    bool        m_hidden;       // Under display, etc
-    bool        m_hasFormat;    // Has format code
+    string m_text;
+    bool m_hidden;  // Under display, etc
+    bool m_hasFormat;  // Has format code
+    char m_missingArgChar;  // Format code when argument without format, 'h'/'o'/'b'
 public:
     class NoFormat {};
-    AstSFormatF(FileLine* fl, const string& text, bool hidden, AstNode* exprsp)
-        : ASTGEN_SUPER(fl), m_text(text), m_hidden(hidden), m_hasFormat(true) {
+    AstSFormatF(FileLine* fl, const string& text, bool hidden, AstNode* exprsp,
+                char missingArgChar = 'd')
+        : ASTGEN_SUPER(fl)
+        , m_text(text), m_hidden(hidden), m_hasFormat(true), m_missingArgChar(missingArgChar) {
         dtypeSetString();
         addNOp1p(exprsp); addNOp2p(NULL); }
-    AstSFormatF(FileLine* fl, NoFormat, AstNode* exprsp)
-        : ASTGEN_SUPER(fl), m_text(""), m_hidden(true), m_hasFormat(false) {
+    AstSFormatF(FileLine* fl, NoFormat, AstNode* exprsp, char missingArgChar = 'd')
+        : ASTGEN_SUPER(fl)
+        , m_text(""), m_hidden(true), m_hasFormat(false), m_missingArgChar(missingArgChar) {
         dtypeSetString();
         addNOp1p(exprsp); addNOp2p(NULL); }
     ASTNODE_NODE_FUNCS(SFormatF)
@@ -2988,6 +2992,7 @@ public:
     bool hidden() const { return m_hidden; }
     void hasFormat(bool flag) { m_hasFormat = flag; }
     bool hasFormat() const { return m_hasFormat; }
+    char missingArgChar() const { return m_missingArgChar; }
 };
 
 class AstDisplay : public AstNodeStmt {
@@ -2995,18 +3000,19 @@ class AstDisplay : public AstNodeStmt {
     // Children: file which must be a varref
     // Children: SFORMATF to generate print string
 private:
-    AstDisplayType      m_displayType;
+    AstDisplayType m_displayType;
 public:
     AstDisplay(FileLine* fl, AstDisplayType dispType, const string& text, AstNode* filep,
-               AstNode* exprsp)
+               AstNode* exprsp, char missingArgChar = 'd')
         : ASTGEN_SUPER(fl) {
-        setOp1p(new AstSFormatF(fl, text, true, exprsp));
+        setOp1p(new AstSFormatF(fl, text, true, exprsp, missingArgChar));
         setNOp3p(filep);
         m_displayType = dispType;
     }
-    AstDisplay(FileLine* fl, AstDisplayType dispType, AstNode* filep, AstNode* exprsp)
+    AstDisplay(FileLine* fl, AstDisplayType dispType, AstNode* filep, AstNode* exprsp,
+               char missingArgChar = 'd')
         : ASTGEN_SUPER(fl) {
-        setOp1p(new AstSFormatF(fl, AstSFormatF::NoFormat(), exprsp));
+        setOp1p(new AstSFormatF(fl, AstSFormatF::NoFormat(), exprsp, missingArgChar));
         setNOp3p(filep);
         m_displayType = dispType;
     }
@@ -3092,9 +3098,10 @@ class AstSFormat : public AstNodeStmt {
     // Children: string to load
     // Children: SFORMATF to generate print string
 public:
-    AstSFormat(FileLine* fl, AstNode* lhsp, const string& text, AstNode* exprsp)
+    AstSFormat(FileLine* fl, AstNode* lhsp, const string& text, AstNode* exprsp,
+               char missingArgChar = 'd')
         : ASTGEN_SUPER(fl) {
-        setOp1p(new AstSFormatF(fl, text, true, exprsp));
+        setOp1p(new AstSFormatF(fl, text, true, exprsp, missingArgChar));
         setOp3p(lhsp);
     }
     ASTNODE_NODE_FUNCS(SFormat)
diff --git a/src/V3Width.cpp b/src/V3Width.cpp
index dc4152b46..0f886eea2 100644
--- a/src/V3Width.cpp
+++ b/src/V3Width.cpp
@@ -2819,7 +2819,7 @@ private:
                     } else if (argp && argp->isString()) {
                         ch = '@';
                     } else {
-                        ch = 'h';
+                        ch = nodep->missingArgChar();
                     }
                     if (argp) argp = argp->nextp();
                     break;
diff --git a/src/verilog.l b/src/verilog.l
index 33b791946..2ebd3694e 100644
--- a/src/verilog.l
+++ b/src/verilog.l
@@ -197,6 +197,9 @@ vnum    {vnum1}|{vnum2}|{vnum3}|{vnum4}|{vnum5}
   "$cos"                { FL; return yD_COS; }
   "$cosh"               { FL; return yD_COSH; }
   "$display"            { FL; return yD_DISPLAY; }
+  "$displayb"           { FL; return yD_DISPLAYB; }
+  "$displayh"           { FL; return yD_DISPLAYH; }
+  "$displayo"           { FL; return yD_DISPLAYO; }
   "$dumpall"            { FL; return yD_DUMPALL; }
   "$dumpfile"           { FL; return yD_DUMPFILE; }
   "$dumpflush"          { FL; return yD_DUMPFLUSH; }
@@ -213,6 +216,9 @@ vnum    {vnum1}|{vnum2}|{vnum3}|{vnum4}|{vnum5}
   "$exp"                { FL; return yD_EXP; }
   "$fclose"             { FL; return yD_FCLOSE; }
   "$fdisplay"           { FL; return yD_FDISPLAY; }
+  "$fdisplayb"          { FL; return yD_FDISPLAYB; }
+  "$fdisplayh"          { FL; return yD_FDISPLAYH; }
+  "$fdisplayo"          { FL; return yD_FDISPLAYO; }
   "$feof"               { FL; return yD_FEOF; }
   "$fflush"             { FL; return yD_FFLUSH; }
   "$fgetc"              { FL; return yD_FGETC; }
@@ -227,6 +233,9 @@ vnum    {vnum1}|{vnum2}|{vnum3}|{vnum4}|{vnum5}
   "$ftell"              { FL; return yD_FTELL; }
   "$fullskew"           { FL; return yaTIMINGSPEC; }
   "$fwrite"             { FL; return yD_FWRITE; }
+  "$fwriteb"            { FL; return yD_FWRITEB; }
+  "$fwriteh"            { FL; return yD_FWRITEH; }
+  "$fwriteo"            { FL; return yD_FWRITEO; }
   "$hold"               { FL; return yaTIMINGSPEC; }
   "$hypot"              { FL; return yD_HYPOT; }
   "$itor"               { FL; return yD_ITOR; }
@@ -245,9 +254,9 @@ vnum    {vnum1}|{vnum2}|{vnum3}|{vnum4}|{vnum5}
   "$removal"            { FL; return yaTIMINGSPEC; }
   "$rewind"             { FL; return yD_REWIND; }
   "$rtoi"               { FL; return yD_RTOI; }
+  "$sampled"            { FL; return yD_SAMPLED; }
   "$setup"              { FL; return yaTIMINGSPEC; }
   "$setuphold"          { FL; return yaTIMINGSPEC; }
-  "$sampled"            { FL; return yD_SAMPLED; }
   "$sformat"            { FL; return yD_SFORMAT; }
   "$sformatf"           { FL; return yD_SFORMATF; }
   "$shortrealtobits"    { FL; return yD_SHORTREALTOBITS; }
@@ -259,6 +268,9 @@ vnum    {vnum1}|{vnum2}|{vnum3}|{vnum4}|{vnum5}
   "$stime"              { FL; return yD_STIME; }
   "$stop"               { FL; return yD_STOP; }
   "$swrite"             { FL; return yD_SWRITE; }
+  "$swriteb"            { FL; return yD_SWRITEB; }
+  "$swriteh"            { FL; return yD_SWRITEH; }
+  "$swriteo"            { FL; return yD_SWRITEO; }
   "$system"             { FL; return yD_SYSTEM; }
   "$tan"                { FL; return yD_TAN; }
   "$tanh"               { FL; return yD_TANH; }
@@ -270,6 +282,9 @@ vnum    {vnum1}|{vnum2}|{vnum3}|{vnum4}|{vnum5}
   "$value$plusargs"     { FL; return yD_VALUEPLUSARGS; }
   "$width"              { FL; return yaTIMINGSPEC; }
   "$write"              { FL; return yD_WRITE; }
+  "$writeb"             { FL; return yD_WRITEB; }
+  "$writeh"             { FL; return yD_WRITEH; }
+  "$writeo"             { FL; return yD_WRITEO; }
   "$writememh"          { FL; return yD_WRITEMEMH; }
   /*     Keywords */
   "always"              { FL; return yALWAYS; }
@@ -374,19 +389,6 @@ vnum    {vnum1}|{vnum2}|{vnum3}|{vnum4}|{vnum5}
   "wor"                 { FL; return yWOR; }
   "xnor"                { FL; return yXNOR; }
   "xor"                 { FL; return yXOR; }
-  /*     Special errors */
-  "$displayb"           { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $display with %%b format instead: %s", yytext); }
-  "$displayh"           { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $display with %%x format instead: %s", yytext); }
-  "$displayo"           { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $display with %%o format instead: %s", yytext); }
-  "$fdisplayb"          { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $fdisplay with %%b format instead: %s", yytext); }
-  "$fdisplayh"          { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $fdisplay with %%x format instead: %s", yytext); }
-  "$fdisplayo"          { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $fdisplay with %%o format instead: %s", yytext); }
-  "$fwriteb"            { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $fwrite with %%b format instead: %s", yytext); }
-  "$fwriteh"            { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $fwrite with %%x format instead: %s", yytext); }
-  "$fwriteo"            { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $fwrite with %%o format instead: %s", yytext); }
-  "$writeb"             { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $write with %%b format instead: %s", yytext); }
-  "$writeh"             { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $write with %%x format instead: %s", yytext); }
-  "$writeo"             { FL; RETURN_BBOX_SYS_OR_MSG("Unsupported: Use $write with %%o format instead: %s", yytext); }
 }
 
   /* Verilog 2001 */
diff --git a/src/verilog.y b/src/verilog.y
index 8ad3f5fb9..70c6288e0 100644
--- a/src/verilog.y
+++ b/src/verilog.y
@@ -553,6 +553,9 @@ class AstSenTree;
 %token<fl>		yD_COUNTONES	"$countones"
 %token<fl>		yD_DIMENSIONS	"$dimensions"
 %token<fl>		yD_DISPLAY	"$display"
+%token<fl>		yD_DISPLAYB	"$displayb"
+%token<fl>		yD_DISPLAYH	"$displayh"
+%token<fl>		yD_DISPLAYO	"$displayo"
 %token<fl>		yD_DUMPALL	"$dumpall"
 %token<fl>		yD_DUMPFILE	"$dumpfile"
 %token<fl>		yD_DUMPFLUSH	"$dumpflush"
@@ -566,6 +569,9 @@ class AstSenTree;
 %token<fl>		yD_FATAL	"$fatal"
 %token<fl>		yD_FCLOSE	"$fclose"
 %token<fl>		yD_FDISPLAY	"$fdisplay"
+%token<fl>		yD_FDISPLAYB	"$fdisplayb"
+%token<fl>		yD_FDISPLAYH	"$fdisplayh"
+%token<fl>		yD_FDISPLAYO	"$fdisplayo"
 %token<fl>		yD_FEOF		"$feof"
 %token<fl>		yD_FFLUSH	"$fflush"
 %token<fl>		yD_FGETC	"$fgetc"
@@ -579,6 +585,9 @@ class AstSenTree;
 %token<fl>		yD_FSEEK	"$fseek"
 %token<fl>		yD_FTELL	"$ftell"
 %token<fl>		yD_FWRITE	"$fwrite"
+%token<fl>		yD_FWRITEB	"$fwriteb"
+%token<fl>		yD_FWRITEH	"$fwriteh"
+%token<fl>		yD_FWRITEO	"$fwriteo"
 %token<fl>		yD_HIGH		"$high"
 %token<fl>		yD_HYPOT	"$hypot"
 %token<fl>		yD_INCREMENT	"$increment"
@@ -614,6 +623,9 @@ class AstSenTree;
 %token<fl>		yD_STIME	"$stime"
 %token<fl>		yD_STOP		"$stop"
 %token<fl>		yD_SWRITE	"$swrite"
+%token<fl>		yD_SWRITEB	"$swriteb"
+%token<fl>		yD_SWRITEH	"$swriteh"
+%token<fl>		yD_SWRITEO	"$swriteo"
 %token<fl>		yD_SYSTEM	"$system"
 %token<fl>		yD_TAN		"$tan"
 %token<fl>		yD_TANH		"$tanh"
@@ -627,7 +639,10 @@ class AstSenTree;
 %token<fl>		yD_VALUEPLUSARGS "$value$plusargs"
 %token<fl>		yD_WARNING	"$warning"
 %token<fl>		yD_WRITE	"$write"
+%token<fl>		yD_WRITEB	"$writeb"
+%token<fl>		yD_WRITEH	"$writeh"
 %token<fl>		yD_WRITEMEMH	"$writememh"
+%token<fl>		yD_WRITEO	"$writeo"
 
 %token<fl>		yVL_CLOCK		"/*verilator sc_clock*/"
 %token<fl>		yVL_CLOCKER		"/*verilator clocker*/"
@@ -3195,16 +3210,40 @@ system_t_call<nodep>:		// IEEE: system_tf_call (as task)
 	|	yD_STOP parenE				{ $$ = new AstStop($1, false); }
 	|	yD_STOP '(' expr ')'			{ $$ = new AstStop($1, false); DEL($3); }
 	//
-	|	yD_SFORMAT '(' expr ',' str commaEListE ')'	{ $$ = new AstSFormat($1,$3,*$5,$6); }
-	|	yD_SWRITE  '(' expr ',' str commaEListE ')'	{ $$ = new AstSFormat($1,$3,*$5,$6); }
+	|	yD_SFORMAT '(' expr ',' str commaEListE ')'	{ $$ = new AstSFormat($1, $3, *$5, $6); }
+	|	yD_SWRITE  '(' expr ',' str commaEListE ')'	{ $$ = new AstSFormat($1, $3, *$5, $6); }
+	|	yD_SWRITEB '(' expr ',' str commaEListE ')'	{ $$ = new AstSFormat($1, $3, *$5, $6, 'b'); }
+	|	yD_SWRITEH '(' expr ',' str commaEListE ')'	{ $$ = new AstSFormat($1, $3, *$5, $6, 'h'); }
+	|	yD_SWRITEO '(' expr ',' str commaEListE ')'	{ $$ = new AstSFormat($1, $3, *$5, $6, 'o'); }
 	//
 	|	yD_DISPLAY  parenE			{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, NULL, NULL); }
 	|	yD_DISPLAY  '(' exprList ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, NULL, $3); }
+	|	yD_DISPLAYB  parenE			{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, NULL, NULL, 'b'); }
+	|	yD_DISPLAYB  '(' exprList ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, NULL, $3, 'b'); }
+	|	yD_DISPLAYH  parenE			{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, NULL, NULL, 'h'); }
+	|	yD_DISPLAYH  '(' exprList ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, NULL, $3, 'h'); }
+	|	yD_DISPLAYO  parenE			{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, NULL, NULL, 'o'); }
+	|	yD_DISPLAYO  '(' exprList ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, NULL, $3, 'o'); }
 	|	yD_WRITE    parenE			{ $$ = NULL; }  // NOP
 	|	yD_WRITE    '(' exprList ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_WRITE,   NULL, $3); }
+	|	yD_WRITEB   parenE			{ $$ = NULL; }  // NOP
+	|	yD_WRITEB   '(' exprList ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_WRITE,   NULL, $3, 'b'); }
+	|	yD_WRITEH   parenE			{ $$ = NULL; }  // NOP
+	|	yD_WRITEH   '(' exprList ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_WRITE,   NULL, $3, 'h'); }
+	|	yD_WRITEO   parenE			{ $$ = NULL; }  // NOP
+	|	yD_WRITEO   '(' exprList ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_WRITE,   NULL, $3, 'o'); }
 	|	yD_FDISPLAY '(' expr ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, $3, NULL); }
 	|	yD_FDISPLAY '(' expr ',' exprListE ')' 	{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, $3, $5); }
+	|	yD_FDISPLAYB '(' expr ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, $3, NULL, 'b'); }
+	|	yD_FDISPLAYB '(' expr ',' exprListE ')' { $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, $3, $5, 'b'); }
+	|	yD_FDISPLAYH '(' expr ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, $3, NULL, 'h'); }
+	|	yD_FDISPLAYH '(' expr ',' exprListE ')' { $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, $3, $5, 'h'); }
+	|	yD_FDISPLAYO '(' expr ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, $3, NULL, 'o'); }
+	|	yD_FDISPLAYO '(' expr ',' exprListE ')' { $$ = new AstDisplay($1,AstDisplayType::DT_DISPLAY, $3, $5, 'o'); }
 	|	yD_FWRITE   '(' expr ',' exprListE ')'	{ $$ = new AstDisplay($1,AstDisplayType::DT_WRITE,   $3, $5); }
+	|	yD_FWRITEB  '(' expr ',' exprListE ')'	{ $$ = new AstDisplay($1,AstDisplayType::DT_WRITE,   $3, $5, 'b'); }
+	|	yD_FWRITEO  '(' expr ',' exprListE ')'	{ $$ = new AstDisplay($1,AstDisplayType::DT_WRITE,   $3, $5, 'h'); }
+	|	yD_FWRITEH  '(' expr ',' exprListE ')'	{ $$ = new AstDisplay($1,AstDisplayType::DT_WRITE,   $3, $5, 'o'); }
 	|	yD_INFO	    parenE			{ $$ = new AstDisplay($1,AstDisplayType::DT_INFO,    NULL, NULL); }
 	|	yD_INFO	    '(' exprList ')'		{ $$ = new AstDisplay($1,AstDisplayType::DT_INFO,    NULL, $3); }
 	|	yD_WARNING  parenE			{ $$ = new AstDisplay($1,AstDisplayType::DT_WARNING, NULL, NULL); }
diff --git a/test_regress/t/t_assert_comp_bad.out b/test_regress/t/t_assert_comp_bad.out
index ec27ed155..a3d3be7a7 100644
--- a/test_regress/t/t_assert_comp_bad.out
+++ b/test_regress/t/t_assert_comp_bad.out
@@ -7,7 +7,7 @@
       $warning("User compile-time warning");
       ^~~~~~~~
                    ... Use "/* verilator lint_off USERWARN */" and lint_on around source to disable this message.
-%Warning-USERWARN: t/t_assert_comp_bad.v:11: 00000001
+%Warning-USERWARN: t/t_assert_comp_bad.v:11:           1
                                            : ... In instance t
       $warning(1);   
       ^~~~~~~~
diff --git a/test_regress/t/t_display.out b/test_regress/t/t_display.out
index 289022a90..7102f4108 100644
--- a/test_regress/t/t_display.out
+++ b/test_regress/t/t_display.out
@@ -43,11 +43,15 @@
 [0] %s=! %s= what! %s= hmmm!1234
 [0] %6s=:     !: %6s=: what!: %6s=: hmmm!1234:
 [0] %8s=:  sv-str:
+d:  12  12
+h: 00c 00c
+o: 014 014
+b: 000001100 000001100
 [0] hello, from a very long string. Percent %s are literally substituted in.
 hello, from a concatenated string.
 hello, from a concatenated format string [0].
-extra argument: 0000000000000000
-0000000000000000: pre argument
+extra argument:                    0
+                   0: pre argument
 [0] Embedded <#013> return
 [0] Embedded
 multiline
diff --git a/test_regress/t/t_display.v b/test_regress/t/t_display.v
index 90b80c6eb..12bc6db5f 100644
--- a/test_regress/t/t_display.v
+++ b/test_regress/t/t_display.v
@@ -132,6 +132,12 @@ module t;
       $display("[%0t] %%8s=:%8s:", $time,
                svs);
 
+      // Displays without format, must use default
+      $write("d: "); $write(nine); $write(" "); $display(nine);
+      $writeh("h: "); $writeh(nine); $writeh(" "); $displayh(nine);
+      $writeo("o: "); $writeo(nine); $writeo(" "); $displayo(nine);
+      $writeb("b: "); $writeb(nine); $writeb(" "); $displayb(nine);
+
       $display("[%0t] %s%s%s", $time,
                "hel", "lo, fr", "om a very long string. Percent %s are literally substituted in.");
       $display("hel", "lo, fr", "om a concatenated string.");
diff --git a/test_regress/t/t_display_merge.out b/test_regress/t/t_display_merge.out
index 5d290cba7..7ab198f50 100644
--- a/test_regress/t/t_display_merge.out
+++ b/test_regress/t/t_display_merge.out
@@ -8,12 +8,12 @@ f
  t2=0
  post
  t3=0
- t4=0 t5=00000000000000000
+ t4=0 t5=0                   0
 m
  t=0 t2=0 t3=0 t4=0 t5=0
  t=0 t2=0 t3=0 t4=0 t5=0
 mm
 
-f a=top.t b=top.t pre t=0 t2=0 post t3=0 t4=0 t5=00000000000000000m t=0 t2=0 t3=0 t4=0 t5=0 t=0 t2=0 t3=0 t4=0 t5=0mm
+f a=top.t b=top.t pre t=0 t2=0 post t3=0 t4=0 t5=0                   0m t=0 t2=0 t3=0 t4=0 t5=0 t=0 t2=0 t3=0 t4=0 t5=0mm
 
 *-* All Finished *-*
diff --git a/test_regress/t/t_sys_file_basic.out b/test_regress/t/t_sys_file_basic.out
new file mode 100644
index 000000000..bd5e9f664
--- /dev/null
+++ b/test_regress/t/t_sys_file_basic.out
@@ -0,0 +1,6 @@
+[0] hello v=12345667
+[0] Hello2
+d:         12         12
+h: 00000000014 0000000c
+o: 0000000c 00000000014
+b: 00000000000000000000000000001100 00000000000000000000000000001100
diff --git a/test_regress/t/t_sys_file_basic.pl b/test_regress/t/t_sys_file_basic.pl
index 1c167efd4..5e4c3a3ba 100755
--- a/test_regress/t/t_sys_file_basic.pl
+++ b/test_regress/t/t_sys_file_basic.pl
@@ -21,10 +21,7 @@ execute(
     check_finished => 1,
     );
 
-file_grep("$Self->{obj_dir}/t_sys_file_basic_test.log",
-qr/\[0\] hello v=12345667
-\[0\] Hello2
-/);
+files_identical("$Self->{obj_dir}/t_sys_file_basic_test.log", $Self->{golden_filename});
 
 ok(1);
 1;
diff --git a/test_regress/t/t_sys_file_basic.v b/test_regress/t/t_sys_file_basic.v
index d0bb007c4..60ed787bb 100644
--- a/test_regress/t/t_sys_file_basic.v
+++ b/test_regress/t/t_sys_file_basic.v
@@ -19,6 +19,7 @@ module t;
    reg [16*8:1]	letterz;
    real		r;
    string	s;
+   integer 	i;
 
    reg [7:0] 	v_a,v_b,v_c,v_d;
    reg [31:0] 	v_worda;
@@ -51,6 +52,13 @@ module t;
 
       $fdisplay(file, "[%0t] hello v=%x", $time, 32'h12345667);
       $fwrite(file, "[%0t] %s\n", $time, "Hello2");
+
+      i = 12;
+      $fwrite(file, "d: "); $fwrite(file, i); $fwrite(file, " "); $fdisplay(file, i);
+      $fwriteh(file, "h: "); $fwriteh(file, i); $fwriteh(file, " "); $fdisplayh(file, i);
+      $fwriteo(file, "o: "); $fwriteo(file, i); $fwriteo(file, " "); $fdisplayo(file, i);
+      $fwriteb(file, "b: "); $fwriteb(file, i); $fwriteb(file, " "); $fdisplayb(file, i);
+
       $fflush(file);
 
       $fclose(file);