From 95d4f4d4be33b1eb4ed94633b4654540bbf6eb22 Mon Sep 17 00:00:00 2001
From: mahlemiut <bsr@xnet.co.nz>
Date: Sat, 23 Jul 2016 22:51:03 +1200
Subject: [PATCH] amstrad: allow any value for the last byte in Plus ASIC
 unlock sequence

---
 src/mame/machine/amstrad.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/mame/machine/amstrad.cpp b/src/mame/machine/amstrad.cpp
index bc48e1e76ad..a26ebcbc07d 100644
--- a/src/mame/machine/amstrad.cpp
+++ b/src/mame/machine/amstrad.cpp
@@ -1996,6 +1996,16 @@ void amstrad_state::amstrad_plus_seqcheck(int data)
 			m_asic.enabled = 1;
 		}
 	}
+	else
+	{
+		// last byte of ASIC sequence can be any value
+		if(m_asic.seqptr == 14)
+		{
+			m_asic.seqptr++;
+			logerror("SYS: ASIC unlocked\n");
+			m_asic.enabled = 1;
+		}
+	}
 	m_prev_data = data;
 }