Added H Counter to try and fix Sonic demo - didn't work

2026-05-16 20:26:13 +01:00
parent b1ff22c9e6
commit f1140fa115
2 changed files with 24 additions and 1 deletions
--- a/Core/Io/SmsIoBus.cs
+++ b/Core/Io/SmsIoBus.cs
@@ -25,7 +25,11 @@ namespace Core.Io
                // VDP V-Counter (Vertical Scanline Position)
                return VideoProcessor.ReadVCounter();
            }
-
+            if (lowerPort == 0x7F)
+            {
+                // THE FIX: VDP H-Counter (Horizontal Pixel Position)
+                return VideoProcessor.ReadHCounter();
+            }
            if (lowerPort >= 0x80 && lowerPort <= 0xBF)
            {
                // Even ports (like 0xBE) are Data. Odd ports (like 0xBF) are Control.