From a3df106f9287d49f08bd63ca92ee6f3689204a88 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Mon, 6 Feb 2023 20:32:24 -0500
Subject: [PATCH] Reset write phase only upon traditional register accesses.

---
 Components/9918/Implementation/9918.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Components/9918/Implementation/9918.cpp b/Components/9918/Implementation/9918.cpp
index d659becda..b6acd78be 100644
--- a/Components/9918/Implementation/9918.cpp
+++ b/Components/9918/Implementation/9918.cpp
@@ -1068,10 +1068,13 @@ uint8_t Base<personality>::read_register_indirect() {
 
 template <Personality personality>
 uint8_t TMS9918<personality>::read(int address) {
-	// TODO: is this still a global effect of reads, even in the world of the Yamahas?
-	this->write_phase_ = false;
+	const int target = this->masked_address(address);
 
-	switch(this->masked_address(address)) {
+	if(target < 2) {
+		this->write_phase_ = false;
+	}
+
+	switch(target) {
 		default: return 0xff;
 		case 0:	return this->read_vram();
 		case 1:	return this->read_register();