From fea593bd65905d4be1c6ecfa5406e1ca25d76cd3 Mon Sep 17 00:00:00 2001
From: angelosa <lordkale4@gmail.com>
Date: Sat, 1 Apr 2023 02:44:02 +0200
Subject: [PATCH] atari/atarigt.cpp: fix MT#07146

---
 src/mame/atari/atarigt.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/mame/atari/atarigt.cpp b/src/mame/atari/atarigt.cpp
index 44a72cdd6fe..69ee735c29d 100644
--- a/src/mame/atari/atarigt.cpp
+++ b/src/mame/atari/atarigt.cpp
@@ -248,6 +248,13 @@ void atarigt_state::latch_w(offs_t offset, uint32_t data, uint32_t mem_mask)
 
 	if (ACCESSING_BITS_16_23)
 	{
+		// tmek20 needs following otherwise will cause a Cage CPU crash
+		// that eventually turns into a MAME hardlock.
+		// https://mametesters.org/view.php?id=7146
+		m_cage->reset_w(!BIT(data, 21));
+		// sndres may reset internals instead?
+		// 0 in tmek, 1 in primrage
+		// also cfr. m_cage->control_w
 		//cage_reset_w(space, data & 0x00100000);
 		machine().bookkeeping().coin_counter_w(0, data & 0x00080000);
 		machine().bookkeeping().coin_counter_w(1, data & 0x00010000);