diff --git a/src/devices/cpu/pdp8/hd6120.cpp b/src/devices/cpu/pdp8/hd6120.cpp
index 769a41d8b5b..fda3deea264 100644
--- a/src/devices/cpu/pdp8/hd6120.cpp
+++ b/src/devices/cpu/pdp8/hd6120.cpp
@@ -664,27 +664,29 @@ void hd6120_device::execute_run()
 
 		case minor_state::OP1_1:
 			m_pc = m_temp & 07777;
-			m_temp = (BIT(m_ir, 7) ? 0 : m_ac) ^ (BIT(m_ir, 5) ? 07777 : 0);
-			if (BIT(m_ir, 0))
-			{
-				++m_temp;
-				if (m_temp >= 010000)
-					m_flags ^= 4; // LINK is complemented upon carry out
-			}
+			m_temp = (BIT(m_ir, 7) ? 0 : m_ac) ^ (BIT(m_ir, 5) ? 07777 : 0); // CLA and/or CMA
+			if (BIT(m_ir, 6))
+				m_flags &= 3; // CLL
+			if (BIT(m_ir, 4))
+				m_flags ^= 4; // CML
 			m_state = minor_state::OP1_2;
 			break;
 
 		case minor_state::OP1_2:
-			m_ac = m_temp & 07777;
-			if (BIT(m_ir, 6))
-				m_flags &= 3;
-			if (BIT(m_ir, 4))
-				m_flags ^= 4;
+			if (BIT(m_ir, 0))
+			{
+				++m_temp; // IAC
+				if (m_temp == 010000)
+				{
+					m_flags ^= 4; // LINK is complemented upon carry out
+					m_temp = 0;
+				}
+			}
 			m_state = minor_state::OP1_3;
 			break;
 
 		case minor_state::OP1_3:
-			m_temp = rotate_step(m_ac);
+			m_temp = rotate_step(m_temp);
 			if (BIT(m_ir, 1))
 				m_state = minor_state::OP1_4;
 			else