From a23b0f5122695eb3d836988035851c92f667c296 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Thu, 23 Jun 2022 20:57:47 -0400
Subject: [PATCH] Map `STA (d), y` to correct calculator.

---
 Processors/65816/Implementation/65816Storage.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Processors/65816/Implementation/65816Storage.cpp b/Processors/65816/Implementation/65816Storage.cpp
index 677fd496b..ddd9202ec 100644
--- a/Processors/65816/Implementation/65816Storage.cpp
+++ b/Processors/65816/Implementation/65816Storage.cpp
@@ -479,7 +479,11 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
 		target(CycleFetchData);							// AAH.
 
 		target(OperationCopyDataToInstruction);
-		target(OperationConstructAbsoluteYRead);
+		if(type == AccessType::Read) {
+			target(OperationConstructAbsoluteYRead);	// Calculate data address, potentially skipping the next fetch.
+		} else {
+			target(OperationConstructAbsoluteY);		// Calculate data address.
+		}
 		target(CycleFetchIncorrectDataAddress);			// IO.
 
 		read_write(type, is8bit, target);