From 6870dbbeb059268608fd1a5b1c89288b53423558 Mon Sep 17 00:00:00 2001
From: Souryo <mesenemu@gmail.com>
Date: Sun, 30 Oct 2016 10:37:15 -0400
Subject: [PATCH] Study box - Minor improvements, most likely not accurate

---
 Core/StudyBox.h | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/Core/StudyBox.h b/Core/StudyBox.h
index f2111426..1757b007 100644
--- a/Core/StudyBox.h
+++ b/Core/StudyBox.h
@@ -6,6 +6,9 @@ class StudyBox : public BaseMapper
 {
 private:
 	uint8_t _prgRamReg;
+	bool _tapeReady = false;
+	uint16_t _tapeReadyDelay = 0;
+	uint8_t _reg4202 = 0;
 
 protected:
 	virtual uint16_t RegisterStartAddress() { return 0x4200; }
@@ -41,8 +44,14 @@ protected:
 	uint8_t ReadRegister(uint16_t addr)
 	{
 		switch(addr) {
-			case 0x4200: case 0x4201: case 0x4203: return 0x00;
-			case 0x4202: return 0x40;
+			case 0x4200: case 0x4203: return 0x00;
+			case 0x4201: 
+				return 0x10; /* | (EmulationSettings::CheckFlag(EmulationFlags::ShowFPS) ? 0x20 : 0x00)
+					| (EmulationSettings::CheckFlag(EmulationFlags::Turbo) ? 0x40 : 0x00); */
+				/*(EmulationSettings::CheckFlag(EmulationFlags::ShowFPS) ? 0x00 : 0x20) |
+				(EmulationSettings::CheckFlag(EmulationFlags::Turbo) ? 0x00 : 0x50);*/
+
+			case 0x4202: return _tapeReady ? 0x40 : 0x00;
 			default: return 0xFF;
 		}
 	}
@@ -52,12 +61,28 @@ protected:
 		SetCpuMemoryMapping(0x6000, 0x7FFF, _prgRamReg, PrgMemoryType::WorkRam);
 	}
 
+	void ProcessCpuClock()
+	{
+		if(_tapeReadyDelay > 0) {
+			_tapeReadyDelay--;
+			if(_tapeReadyDelay == 0) {
+				_tapeReady = (_reg4202 & 0x10) == 0x10;
+			}
+		}
+	}
+
 	void WriteRegister(uint16_t addr, uint8_t value)
 	{
 		if(addr & 0x4203) {
 			switch(addr & 0x03) {
 				case 0: _prgRamReg = value >> 6; UpdateState(); break;
 				case 1: SelectPRGPage(0, value); break;
+				case 2:
+					_reg4202 = value;
+					_tapeReadyDelay = 100;
+					break;
+				case 3:
+					break;
 			}
 		}
 	}