From 5487612a0ecdcf3aa07273c8f413b57a2c5b167e Mon Sep 17 00:00:00 2001
From: AJR <ajrhacker@users.noreply.github.com>
Date: Mon, 14 Jun 2021 19:28:23 -0400
Subject: [PATCH] hd6120: Prevent PEX from changing AC

---
 src/devices/cpu/pdp8/hd6120.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/devices/cpu/pdp8/hd6120.cpp b/src/devices/cpu/pdp8/hd6120.cpp
index 1455fa7e8298f..947225ae60356 100644
--- a/src/devices/cpu/pdp8/hd6120.cpp
+++ b/src/devices/cpu/pdp8/hd6120.cpp
@@ -1015,6 +1015,7 @@ void hd6120_device::execute_run()
 			break;
 
 		case minor_state::PEX_1:
+			m_temp = m_ac;
 			m_state = minor_state::PEX_2;
 			break;