From d33deb676fe5695c854726dafe888636894195b7 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Wed, 20 Dec 2023 15:55:00 -0500
Subject: [PATCH] Adjust (abs, y) addressing.

---
 .../Implementation/6502Implementation.hpp     | 30 ++++++++++++-------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/Processors/6502/Implementation/6502Implementation.hpp b/Processors/6502/Implementation/6502Implementation.hpp
index 7c6b5ea8e..1c4bcbe5d 100644
--- a/Processors/6502/Implementation/6502Implementation.hpp
+++ b/Processors/6502/Implementation/6502Implementation.hpp
@@ -544,6 +544,17 @@ template <Personality personality, typename T, bool uses_ready_line> void Proces
 							break;
 						}
 					continue;
+					case CycleAddYToAddressLow:
+						next_address_.full = address_.full + y_;
+						address_.halves.low = next_address_.halves.low;
+						if(address_.halves.high != next_address_.halves.high) {
+							page_crossing_stall_read();
+							break;
+						}
+					continue;
+
+#undef page_crossing_stall_read
+
 					case CycleAddXToAddressLowRead:
 						next_address_.full = address_.full + x_;
 						address_.halves.low = next_address_.halves.low;
@@ -559,21 +570,18 @@ template <Personality personality, typename T, bool uses_ready_line> void Proces
 							throwaway_read(pc_.full - 1);
 						}
 					break;
-					case CycleAddYToAddressLow:
-						next_address_.full = address_.full + y_;
-						address_.halves.low = next_address_.halves.low;
-						if(address_.halves.high != next_address_.halves.high) {
-							page_crossing_stall_read();
-							break;
-						}
-					continue;
 					case CycleAddYToAddressLowRead:
 						next_address_.full = address_.full + y_;
 						address_.halves.low = next_address_.halves.low;
-						page_crossing_stall_read();
-					break;
 
-#undef page_crossing_stall_read
+						// A similar rule as for above applies; this one adjusts (abs, y) addressing.
+
+						if(!is_65c02(personality) || next_address_.full == address_.full) {
+							throwaway_read(address_.full);
+						} else {
+							throwaway_read(pc_.full - 1);
+						}
+					break;
 
 					case OperationCorrectAddressHigh:
 						// Preserve the uncorrected address in next_address_ (albeit that it's