From f4f4357a3e19082e9027b7290651fbb5a2100eae Mon Sep 17 00:00:00 2001
From: Adrian Conlon <98398945+AdrianConlon@users.noreply.github.com>
Date: Sat, 3 May 2025 00:51:20 +0100
Subject: [PATCH] More z80 timing fixes, 261 errors

---
 Z80/Z80.cs | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/Z80/Z80.cs b/Z80/Z80.cs
index 7ff2603..4d25aa9 100644
--- a/Z80/Z80.cs
+++ b/Z80/Z80.cs
@@ -771,11 +771,19 @@ namespace Z80
                     {
                         this.Bus.Address.Assign(this.HL);
                     }
-                    if (access == AccessLevel.ReadOnly)
+
+                    switch (access)
                     {
-                        _ = this.MemoryRead();
+                        case AccessLevel.ReadOnly:
+                            this.MemoryRead();
+                            break;
+                        case AccessLevel.WriteOnly:
+                            this.Tick();
+                            break;
+                        default:
+                            throw new NotSupportedException("Invalid access level");
                     }
-                    this.Tick();
+
                     // Will need a post-MemoryWrite
                     return ref this.Bus.Data;
                 case 7: