diff --git a/src/devices/cpu/m6809/konami.lst b/src/devices/cpu/m6809/konami.lst
index ba5b791914d..260a3cbdc56 100644
--- a/src/devices/cpu/m6809/konami.lst
+++ b/src/devices/cpu/m6809/konami.lst
@@ -521,13 +521,13 @@ LSRDI:
 	@m_temp.b.h = read_operand(0);
 	@m_temp.b.l = read_operand(1);
 
-	do
+	while (m_bcount-- & 0xf)
 	{
 		@eat(1);
 		m_cc &= ~CC_C;
 		m_cc |= (m_temp.w & 1) ? CC_C : 0;
 		m_temp.w = set_flags<uint16_t>(CC_NZ, m_temp.w >> 1);
-	} while (--m_bcount & 0xf);
+	}
 
 	@write_operand(0, m_temp.b.h);
 	write_operand(1, m_temp.b.l);
@@ -540,11 +540,11 @@ ASLDI:
 	@m_temp.b.h = read_operand(0);
 	@m_temp.b.l = read_operand(1);
 
-	do
+	while (m_bcount-- & 0xf)
 	{
 		@eat(1);
 		m_temp.w = set_flags<uint16_t>(CC_NZVC, m_temp.w, m_temp.w, m_temp.w << 1);
-	} while (--m_bcount & 0xf);
+	}
 
 	@write_operand(0, m_temp.b.h);
 	write_operand(1, m_temp.b.l);
@@ -557,13 +557,13 @@ ASRDI:
 	@m_temp.b.h = read_operand(0);
 	@m_temp.b.l = read_operand(1);
 
-	do
+	while (m_bcount-- & 0xf)
 	{
 		@eat(1);
 		m_cc &= ~CC_C;
 		m_cc |= (m_temp.w & 1) ? CC_C : 0;
 		m_temp.w = set_flags<uint16_t>(CC_NZ, ((int16_t) m_temp.w) >> 1);
-	} while (--m_bcount & 0xf);
+	}
 
 	@write_operand(0, m_temp.b.h);
 	write_operand(1, m_temp.b.l);
@@ -576,11 +576,11 @@ ROLDI:
 	@m_temp.b.h = read_operand(0);
 	@m_temp.b.l = read_operand(1);
 
-	do
+	while (m_bcount-- & 0xf)
 	{
 		@eat(1);
 		m_temp.w = set_flags<uint16_t>(CC_NZV, rotate_left(m_temp.w));
-	} while (--m_bcount & 0xf);
+	}
 
 	@write_operand(0, m_temp.b.h);
 	write_operand(1, m_temp.b.l);
@@ -593,11 +593,11 @@ RORDI:
 	@m_temp.b.h = read_operand(0);
 	@m_temp.b.l = read_operand(1);
 
-	do
+	while (m_bcount-- & 0xf)
 	{
 		@eat(1);
 		m_temp.w = set_flags<uint16_t>(CC_NZ, rotate_right(m_temp.w));
-	} while (--m_bcount & 0xf);
+	}
 
 	@write_operand(0, m_temp.b.h);
 	write_operand(1, m_temp.b.l);