diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index 06ead93..0b5daea 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -1,3 +1,11 @@
+0.9.2 buck50.{cxx,elf}  0.9.6 buck50.py    2021 Feb 12 Fri
+-----------------------------------------------------------
+* Fixed small buck50.py bugs: Missing initialization in upload_digital()
+  if no samples, typo in `help trigger trigger`, removed extra "#!" line.
+* Added simple vcd2txt.py utility.
+
+
+
 0.9.2 buck50.{cxx,elf}  0.9.5 buck50.py    2021 Jan 12 Tue
 -----------------------------------------------------------
 * Fixed buck50.py bugs in `dump` command with "auto-digital=disabled",
diff --git a/build/buck50.py b/build/buck50.py
index 37da28b..36aa169 100755
--- a/build/buck50.py
+++ b/build/buck50.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 
 # buck50: Test and measurement firmware for “Blue Pill” STM32F103 development board
-# Copyright (C) 2019,2020 Mark R. Rubin aka "thanks4opensource"
+# Copyright (C) 2019, 2020, 2021 Mark R. Rubin aka "thanks4opensource"
 #
 # This file is part of buck50.
 #
@@ -20,7 +20,6 @@
 # <https:#www.gnu.org/licenses/gpl.html>
 
 
-#!/usr/bin/env python3
 
 import argparse
 import collections
@@ -49,7 +48,7 @@
 #
 #
 
-VERSION = (0, 9, 5)
+VERSION = (0, 9, 6)
 
 COPYRIGHT = '''%s %d.%d.%d
 Copyright 2020 Mark R. Rubin aka "thanks4opensource"''' \
@@ -4119,7 +4118,8 @@ def upload_digital(samples   ,
 
         if file:
             if save_as == DigitalFormat.VCD:
-                chng = bits ^ last
+                timval = 0
+                chng   = bits ^ last
                 if chng:
                     timval =    tcks   * upload_config['tick-units'].val \
                              / (CPU_HZ * upload_config['per-tick'  ].val)
@@ -5180,7 +5180,7 @@ def trig_cmd(cmd, input, fields):
                                      % field)
             if not deletes:
                 sys.stderr.write("Specify one or more triggers "
-                                 "to delete: [-m] [p[-q] ...\n" )
+                                 "to delete: n[-m] [p[-q] ...\n" )
                 return
             for delete in deletes:
                 if delete == 0:
diff --git a/build/vcd2txt.py b/build/vcd2txt.py
new file mode 100755
index 0000000..3a76e9b
--- /dev/null
+++ b/build/vcd2txt.py
@@ -0,0 +1,100 @@
+#!/usr/bin/env python3
+
+# buck50: Test and measurement firmware for “Blue Pill” STM32F103 development board
+# Copyright (C) 2019, 2020, 2021 Mark R. Rubin aka "thanks4opensource"
+#
+# This file is part of buck50.
+#
+# The buck50 program is free software: you can redistribute it
+# and/or modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation, either version 3 of
+# the License, or (at your option) any later version.
+#
+# The buck50 program is distributed in the hope that it will be
+# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# (LICENSE.txt) along with the buck50 program.  If not, see
+# <https:#www.gnu.org/licenses/gpl.html>
+
+
+
+import argparse
+import sys
+
+
+
+def parse_commandline():
+    parser = argparse.ArgumentParser(
+                formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+
+
+    def units(text):
+        VALIDS = {'ns' : 1e9,
+                  'us' : 1e6,
+                  'ms' : 1e3,
+                  's'  : 1.0 ,
+                 }
+        if not text in VALIDS:
+            raise argparse.ArgumentTypeError(  "units must be one of {}"
+                                             .format(VALID_SCALES)      )
+        return (text, VALIDS[text])
+
+    parser.add_argument('-u', '--units',
+                        nargs='?',
+                        type=units,
+                        default='us')
+
+    parser.add_argument('infile',
+                        nargs='?',
+                        type=argparse.FileType('r'),
+                        default=sys.stdin)
+
+    parser.add_argument('outfile',
+                        nargs='?',
+                        type=argparse.FileType('w'),
+                        default=sys.stdout)
+
+    return parser.parse_args()
+
+
+
+if __name__ != '__main__':
+    sys.exit(1)
+
+
+UNITS = {'ns' : 1e-9,
+         'us' : 1e-6,
+         'ms' : 1e-3,
+         's'  : 1.0 ,
+        }
+
+args = parse_commandline()
+
+traces = {}
+tick   = None
+for line in args.infile:
+    if line.startswith('$timescale'):
+        fields = line.split()
+        tick = float(fields[1]) * UNITS[fields[2].lower()]
+
+    if line.startswith('$var'):
+        fields = line.split()
+        traces[fields[3]] = fields[4]
+
+    if line.startswith('$enddefinitions'):
+        break
+
+if tick is None:
+    sys.stderr.write("No $timescale in input VCD file\n")
+    sys.exit(1)
+
+for line in args.infile:
+    if line[0] == '#':
+        args.outfile.write(  '%.3f %s\n'
+                           % (int(line[1:]) * tick * args.units[1],
+                                                     args.units[0]))
+    else:
+        args.outfile.write("  %s  %s\n" % (line[0], traces[line[1]]))