From cc4ab9bc25227ebada38aadfafd49ff3abf3c218 Mon Sep 17 00:00:00 2001
From: byuu <2107894+byuu@users.noreply.github.com>
Date: Sat, 28 Dec 2019 13:53:06 +0900
Subject: [PATCH] Added workaround to reduce auto-joypad polling delays (until
 we can emulate the behavior more faithfully)

---
 bsnes/sfc/cpu/timing.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/bsnes/sfc/cpu/timing.cpp b/bsnes/sfc/cpu/timing.cpp
index 20d76f07..d4f713bd 100644
--- a/bsnes/sfc/cpu/timing.cpp
+++ b/bsnes/sfc/cpu/timing.cpp
@@ -5,7 +5,11 @@ auto CPU::dmaCounter() const -> uint {
 
 //joypad auto-poll clock divider
 auto CPU::joypadCounter() const -> uint {
-  return counter.cpu & 255;
+  //todo: this should be &255, but it causes too many issues in games, due to incomplete emulation:
+  //Nuke (PD): inputs do not work (unless clearing $421x to $00)
+  //Taikyoku Igo - Goliath: start button not acknowledged (unless clearing $421x to $ff)
+  //Tatakae Genshijin 2: attract sequence ends early
+  return counter.cpu & 31;
 }
 
 auto CPU::stepOnce() -> void {