diff --git a/biostools/analyzers.py b/biostools/analyzers.py
index 3272924..d4a457a 100644
--- a/biostools/analyzers.py
+++ b/biostools/analyzers.py
@@ -1831,6 +1831,7 @@ class PhoenixAnalyzer(Analyzer):
 		self._rombios_signon_pattern = re.compile(b'''\\x0D\\x0AAll Rights Reserved\\x0D\\x0A(?:\\x0A(?:\\x00(?:[\\x90\\xF4]\\x01)?)?|\\x0D\\x0A\\x0D\\x0A)''')
 		# No "All Rights Reserved" (Yangtech 2.27 / pxxt)
 		self._rombios_signon_alt_pattern = re.compile(b'''\\(R\\)eboot, other keys to continue\\x00\\xFF+''')
+		self._bcpsys_pattern = re.compile(b'''BCPSYS([\\x00-\\xFF]{8})''')
 		self._bcpsys_datetime_pattern = re.compile('''[0-9]{2}/[0-9]{2}/[0-9]{2} ''')
 		self._core_signon_pattern = re.compile(b'''\\x00FOR EVALUATION ONLY\\. NOT FOR RESALE\\.\\x00([\\x00-\\xFF]+?)\\x00Primary Master \\x00''')
 		self._intel_86_pattern = re.compile('''[0-9A-Z]{8}\\.86[0-9A-Z]\\.[0-9A-Z]{3,4}\\.[0-9A-Z]{1,4}\\.[0-9]{10}$''')
@@ -1879,8 +1880,12 @@ class PhoenixAnalyzer(Analyzer):
 			return False
 
 		# Read build code, date and time from BCPSYS on 4.0 and newer BIOSes.
-		offset = file_data.find(b'BCPSYS')
-		if offset > -1:
+		for match in self._bcpsys_pattern.finditer(file_data):
+			# Skip bogus BCPSYS in ACFG (DEC Venturis 466)
+			if match.group(1) == b'\x00\x00\x00\x00\x00\x00\x00\x00':
+				continue
+			offset = match.start(0)
+
 			# Extract the build code as a string.
 			build_code = self.string = util.read_string(file_data[offset + 55:offset + 63].replace(b'\x00', b'\x20')).strip()
 			if build_code:
@@ -1895,6 +1900,8 @@ class PhoenixAnalyzer(Analyzer):
 					self.string += '\n'
 				self.string += date_time
 
+			break
+
 		# Determine if this is a Dell BIOS (48-byte header).
 		offset = file_data.find(b'Dell System ')
 		if offset > -1: