AppleWin/source/MouseInterface.cpp

// Based on Apple in PC's mousecard.cpp
// - Permission given by Kyle Kim to reuse in AppleWin

/*
Contiki v1.3:
. I still see 2 cases of abnormal operation. These occur during boot up, during some period of disk access.
. See Contiki's IRQ() in apple2-stdmou.s

** Normal operation **
 
<VBL EVENT>   : h/w asserts IRQ
<6502 jumps to IRQ vector>
. MOUSE_SERVE : h/w deasserts IRQ
. MOUSE_READ
. RTS with C=1
 
<VBL EVENT>   : h/w asserts IRQ
<6502 jumps to IRQ vector>
. MOUSE_SERVE : h/w deasserts IRQ
. MOUSE_READ
. RTS with C=1
 
Etc.
 
** Abnormal operation **
 
<VBL EVENT>                        : h/w asserts IRQ
<6502 jumps to IRQ vector>
. MOUSE_SERVE (for VBL EVENT)      : h/w deasserts IRQ
<VBL EVENT>				           : h/w asserts IRQ
. MOUSE_READ
  - this clears the mouse IRQ status byte in the mouse-card's "h/w"
. RTS with C=1
 
<6502 jumps to IRQ vector>
. MOUSE_SERVE (for MOVEMENT EVENT) : h/w deasserts IRQ
  - but IRQ status byte is 0
. RTS with C=0

*/


#include "StdAfx.h"

#include "MouseInterface.h"
#include "SaveState_Structs_common.h"
#include "Common.h"

#include "Core.h"	// g_SynchronousEventMgr
#include "CardManager.h"
#include "CPU.h"
#include "Interface.h"	// FrameSetCursorPosByMousePos()
#include "Log.h"
#include "Memory.h"
#include "NTSC.h"	// NTSC_GetCyclesUntilVBlank()
#include "YamlHelper.h"

#include "../resource/resource.h"

#ifdef _DEBUG
	#define _DEBUG_SPURIOUS_IRQ
#endif

// Sets mouse mode
#define MOUSE_SET		0x00
// Reads mouse position
#define MOUSE_READ		0x10
// Services mouse interrupt
#define MOUSE_SERV		0x20
// Clears mouse positions to 0 (for delta mode)
#define MOUSE_CLEAR		0x30
// Sets mouse position to a user-defined pos
#define MOUSE_POS		0x40
// Resets mouse clamps to default values
// Sets mouse position to 0,0
#define MOUSE_INIT		0x50
// Sets mouse bounds in a window
#define MOUSE_CLAMP		0x60
// Sets mouse to upper-left corner of clamp win
#define MOUSE_HOME		0x70

// Set VBL Timing : 0x90 is 60Hz, 0x91 is 50Hz
#define MOUSE_TIME		0x90

#define BIT0		0x01
#define BIT1		0x02
#define BIT2		0x04
#define BIT3		0x08
#define BIT4		0x10
#define BIT5		0x20
#define BIT6		0x40
#define BIT7		0x80

// Interrupt status byte
                                                //Bit 7 6 5 4 3 2 1 0 
                                                //    | | | | | | | | 
#define STAT_PREV_BUTTON1   (1<<0)              //    | | | | | | | \--- Previously, button 1 was up (0) or down (1)
#define STAT_INT_MOVEMENT   (1<<1)              //    | | | | | | \----- Movement interrupt 
#define STAT_INT_BUTTON     (1<<2)              //    | | | | | \------- Button 0/1 interrupt 
#define STAT_INT_VBL        (1<<3)              //    | | | | \--------- VBL interrupt 
#define STAT_CURR_BUTTON1   (1<<4)              //    | | | \----------- Currently, button 1 is up (0) or down (1) 
#define STAT_MOVEMENT_SINCE_READMOUSE   (1<<5)  //    | | \------------- X/Y moved since last READMOUSE 
#define STAT_PREV_BUTTON0   (1<<6)              //    | \--------------- Previously, button 0 was up (0) or down (1)
#define STAT_CURR_BUTTON0   (1<<7)              //    \----------------- Currently, button 0 is up (0) or down (1) 

#define STAT_INT_ALL		(STAT_INT_VBL | STAT_INT_BUTTON | STAT_INT_MOVEMENT)

// Mode byte
                                                //Bit 7 6 5 4 3 2 1 0 
                                                //    | | | | | | | | 
#define MODE_MOUSE_ON       (1<<0)              //    | | | | | | | \--- Mouse off (0) or on (1) 
#define MODE_INT_MOVEMENT   (1<<1)              //    | | | | | | \----- Interrupt if mouse is moved 
#define MODE_INT_BUTTON	    (1<<2)              //    | | | | | \------- Interrupt if button is pressed
#define MODE_INT_VBL        (1<<3)              //    | | | | \--------- Interrupt on VBL 
#define MODE_RESERVED4      (1<<4)              //    | | | \----------- Reserved 
#define MODE_RESERVED5      (1<<5)              //    | | \------------- Reserved 
#define MODE_RESERVED6      (1<<6)              //    | \--------------- Reserved 
#define MODE_RESERVED7      (1<<7)              //    \----------------- Reserved 

#define MODE_INT_ALL		STAT_INT_ALL

//===========================================================================

void M6821_Listener_B( void* objTo, BYTE byData )
{
	((CMouseInterface*)objTo)->On6821_B( byData );
}

void M6821_Listener_A( void* objTo, BYTE byData )
{
	((CMouseInterface*)objTo)->On6821_A( byData );
}

//===========================================================================

CMouseInterface::CMouseInterface(UINT slot) :
	Card(CT_MouseInterface, slot),
	m_pSlotRom(NULL),
	m_syncEvent(slot, 0, SyncEventCallback)	// use slot# as "unique" id for MouseInterfaces
{
	if (m_slot != 4)	// fixme
		throw std::runtime_error("Card: wrong slot");

	m_6821.SetListenerB( this, M6821_Listener_B );
	m_6821.SetListenerA( this, M6821_Listener_A );

//	Uninitialize();
	InitializeROM();
	Reset();
}

CMouseInterface::~CMouseInterface()
{
	delete [] m_pSlotRom;

	if (m_syncEvent.m_active)
		g_SynchronousEventMgr.Remove(m_syncEvent.m_id);
}

//===========================================================================

void CMouseInterface::InitializeROM(void)
{
	_ASSERT(m_pSlotRom == NULL);
	if (m_pSlotRom)
		return;

	const UINT FW_SIZE = 2*1024;
	BYTE* pData = GetFrame().GetResource(IDR_MOUSEINTERFACE_FW, "FIRMWARE", FW_SIZE);
	if(pData == NULL)
		return;

	m_pSlotRom = new BYTE [FW_SIZE];
	memcpy(m_pSlotRom, pData, FW_SIZE);
}

void CMouseInterface::InitializeIO(LPBYTE pCxRomPeripheral)
{
//	m_bActive = true;
	m_bEnabled = true;
	SetSlotRom();	// Pre: m_bActive == true
	RegisterIoHandler(m_slot, &CMouseInterface::IORead, &CMouseInterface::IOWrite, NULL, NULL, this, NULL);

	if (m_syncEvent.m_active) g_SynchronousEventMgr.Remove(m_syncEvent.m_id);
	m_syncEvent.m_cyclesRemaining = NTSC_GetCyclesUntilVBlank(0);
	g_SynchronousEventMgr.Insert(&m_syncEvent);
}

#if 0
void CMouseInterface::Uninitialize()
{
//	m_bActive = false;
}
#endif

void CMouseInterface::Reset()
{
	m_by6821A = 0;
	m_by6821B = 0x40;		// Set PB6
	m_6821.SetPB(m_by6821B);
	m_bVBL = false;
	m_byMode = 0;

	//

	m_nX = 0;
	m_nY = 0;

	m_iX = 0;
	m_iMinX = 0;
	m_iMaxX = 1023;

	m_iY = 0;
	m_iMinY = 0;
	m_iMaxY = 1023;

	m_bButtons[0] = m_bButtons[1] = false;

	//

	Clear();
	memset( m_byBuff, 0, sizeof( m_byBuff ) );
	SetSlotRom();

	// NB. Leave the syncEvent in the list - otherwise nothing else will re-add it!
}

void CMouseInterface::SetSlotRom()
{
//	if (!m_bActive)
//		return;

	LPBYTE pCxRomPeripheral = MemGetCxRomPeripheral();
	if (pCxRomPeripheral == NULL)
		return;

	UINT uOffset = (m_by6821B << 7) & 0x0700;
	memcpy(pCxRomPeripheral+m_slot*256, m_pSlotRom+uOffset, 256);
	if (mem)
		memcpy(mem+0xC000+m_slot*256, m_pSlotRom+uOffset, 256);
}

//===========================================================================

BYTE __stdcall CMouseInterface::IORead(WORD PC, WORD uAddr, BYTE bWrite, BYTE uValue, ULONG nExecutedCycles)
{
	UINT uSlot = ((uAddr & 0xff) >> 4) - 8;
	CMouseInterface* pMouseIF = (CMouseInterface*) MemGetSlotParameters(uSlot);

	BYTE byRS;
	byRS = uAddr & 3;
	return pMouseIF->m_6821.Read( byRS );
}

BYTE __stdcall CMouseInterface::IOWrite(WORD PC, WORD uAddr, BYTE bWrite, BYTE uValue, ULONG nExecutedCycles)
{
	UINT uSlot = ((uAddr & 0xff) >> 4) - 8;
	CMouseInterface* pMouseIF = (CMouseInterface*) MemGetSlotParameters(uSlot);

	BYTE byRS;
	byRS = uAddr & 3;
	pMouseIF->m_6821.Write( byRS, uValue );

	return 0;
}

//===========================================================================

void CMouseInterface::On6821_A(BYTE byData)
{
	m_by6821A = byData;
}

void CMouseInterface::On6821_B(BYTE byData)
{
	BYTE byDiff = ( m_by6821B ^ byData ) & 0x3E;

	if ( byDiff )
	{
		m_by6821B &= ~0x3E;
		m_by6821B |= byData & 0x3E;
		if ( byDiff & BIT5 )			// Write to 0285 chip
		{
			if ( byData & BIT5 )
				m_by6821B |= BIT7;		// OK, I'm ready to read from MC6821
			else						// Clock Activate for read
			{
				m_byBuff[m_nBuffPos++] = m_by6821A;
				if ( m_nBuffPos == 1 )
					OnCommand();
				if ( m_nBuffPos == m_nDataLen || m_nBuffPos > 7 )
				{
					OnWrite();			// Have written all, Commit the command.
					m_nBuffPos = 0;
				}
				m_by6821B &= ~BIT7;		// for next reading
				m_6821.SetPB( m_by6821B );
			}
			
		}
		if ( byDiff & BIT4 )		// Read from 0285 chip ?
		{
			if ( byData & BIT4 )
				m_by6821B &= ~BIT6;		// OK, I'll prepare next value
			else						// Clock Activate for write
			{
				if ( m_nBuffPos )		// if m_nBuffPos is 0, something goes wrong!
					m_nBuffPos++;
				if ( m_nBuffPos == m_nDataLen || m_nBuffPos > 7 )
					m_nBuffPos = 0;			// Have read all, ready for next command.
				else
					m_6821.SetPA( m_byBuff[m_nBuffPos] );
				m_by6821B |= BIT6;		// for next writing
			}
		}
		m_6821.SetPB( m_by6821B );

		//

		SetSlotRom();	// Update Cn00 ROM page
	}
}

void CMouseInterface::OnCommand()
{
#ifdef _DEBUG_SPURIOUS_IRQ
	static UINT uSpuriousIrqCount = 0;
	char szDbg[200];
	BYTE byOldState = m_byState;
#endif

	switch( m_byBuff[0] & 0xF0 )
	{
	case MOUSE_SET:
		m_nDataLen = 1;
		m_byMode = m_byBuff[0] & 0x0F;
		break;
	case MOUSE_READ:				// Read
		m_nDataLen = 6;
		m_byState &= STAT_MOVEMENT_SINCE_READMOUSE;
		m_nX = m_iX;
		m_nY = m_iY;
		if ( m_bBtn0 )	m_byState |= STAT_PREV_BUTTON0;	// Previous Button 0
		if ( m_bBtn1 )	m_byState |= STAT_PREV_BUTTON1;	// Previous Button 1
		m_bBtn0 = m_bButtons[0];
		m_bBtn1 = m_bButtons[1];
		if ( m_bBtn0 )	m_byState |= STAT_CURR_BUTTON0;	// Current Button 0
		if ( m_bBtn1 )	m_byState |= STAT_CURR_BUTTON1;	// Current Button 1
		m_byBuff[1] = m_nX & 0xFF;
		m_byBuff[2] = ( m_nX >> 8 ) & 0xFF;
		m_byBuff[3] = m_nY & 0xFF;
		m_byBuff[4] = ( m_nY >> 8 ) & 0xFF;
		m_byBuff[5] = m_byState;					// button 0/1 interrupt status
		m_byState &= ~STAT_MOVEMENT_SINCE_READMOUSE;
#ifdef _DEBUG_SPURIOUS_IRQ
		sprintf(szDbg, "[MOUSE_READ] Old=%02X New=%02X\n", byOldState, m_byState); OutputDebugString(szDbg);
#endif
		break;
	case MOUSE_SERV:
		m_nDataLen = 2;
		m_byBuff[1] = m_byState & ~STAT_MOVEMENT_SINCE_READMOUSE;			// reason of interrupt
#ifdef _DEBUG_SPURIOUS_IRQ
		if ((m_byMode & MODE_INT_ALL) && (m_byBuff[1] & MODE_INT_ALL) == 0)
		{
			uSpuriousIrqCount++;
			sprintf(szDbg, "[MOUSE_SERV] 0x%04X Buff[1]=0x%02X, ***\n", uSpuriousIrqCount, m_byBuff[1]); OutputDebugString(szDbg);
		}
		else
		{
			sprintf(szDbg, "[MOUSE_SERV] ------ Buff[1]=0x%02X\n", m_byBuff[1]); OutputDebugString(szDbg);
		}
#endif
		CpuIrqDeassert(IS_MOUSE);
		break;
	case MOUSE_CLEAR:
		Clear();					// [TC] NB. Don't reset clamp values (eg. Fantavision)
		m_nDataLen = 1;
		break;
	case MOUSE_POS:
		m_nDataLen = 5;
		break;
	case MOUSE_INIT:
		m_nDataLen = 3;
		m_byBuff[1] = 0xFF;			// I don't know what it is
		break;
	case MOUSE_CLAMP:
		m_nDataLen = 5;
		break;
	case MOUSE_HOME:
		m_nDataLen = 1;
		SetPositionAbs( 0, 0 );
		break;
	case MOUSE_TIME:		// 0x90
		switch( m_byBuff[0] & 0x0C )
		{
		case 0x00: m_nDataLen = 1; break;	// write cmd ( #$90 is DATATIME 60Hz, #$91 is 50Hz )
		case 0x04: m_nDataLen = 3; break;	// write cmd, $0478, $04F8
		case 0x08: m_nDataLen = 2; break;	// write cmd, $0578
		case 0x0C: m_nDataLen = 4; break;	// write cmd, $0478, $04F8, $0578
		}
		break;
	case 0xA0:
		m_nDataLen = 2;
		break;
	case 0xB0:
	case 0xC0:
		m_nDataLen = 1;
		break;
	default:
		m_nDataLen = 1;
		//TRACE( "CMD : UNKNOWN CMD : #$%02X\n", m_byBuff[0] );
		//_ASSERT(0);
		break;
	}
	m_6821.SetPA( m_byBuff[1] );
}

void CMouseInterface::OnWrite()
{
	int nMin, nMax;
	switch( m_byBuff[0] & 0xF0 )
	{
	case MOUSE_CLAMP:
		// Blazing Paddles:
		// . MOUSE_CLAMP(Y, 0xFFEC, 0x00D3)
		// . MOUSE_CLAMP(X, 0xFFEC, 0x012B)
		nMin = ( m_byBuff[3] << 8 ) | m_byBuff[1];
		nMax = ( m_byBuff[4] << 8 ) | m_byBuff[2];
		if ( m_byBuff[0] & 1 )	// Clamp Y
			SetClampY( nMin, nMax );
		else					// Clamp X
			SetClampX( nMin, nMax );
		break;
	case MOUSE_POS:
		m_nX = ( m_byBuff[2] << 8 ) | m_byBuff[1];
		m_nY = ( m_byBuff[4] << 8 ) | m_byBuff[3];
		SetPositionAbs( m_nX, m_nY );
		break;
	case MOUSE_INIT:
		m_nX = 0;
		m_nY = 0;
		SetClampX( 0, 1023 );
		SetClampY( 0, 1023 );
		SetPositionAbs( 0, 0 );
		break;
	}
}

void CMouseInterface::OnMouseEvent(bool bEventVBL)
{
	int byState = 0;

	if ( !( m_byMode & MODE_MOUSE_ON ) )		// Mouse Off
		return;

	if ( m_nX != m_iX || m_nY != m_iY )
	{
		byState |= STAT_INT_MOVEMENT|STAT_MOVEMENT_SINCE_READMOUSE;	// X/Y moved since last READMOUSE | Movement interrupt
		m_byState |= STAT_MOVEMENT_SINCE_READMOUSE;							// [TC] Used by CopyII+9.1 and ProTERM3.1
	}

	if ( m_bBtn0 != m_bButtons[0] || m_bBtn1 != m_bButtons[1] )
		byState |= STAT_INT_BUTTON;		// Button 0/1 interrupt
	if ( bEventVBL )
		byState |= STAT_INT_VBL;

	//byState &= m_byMode & 0x2E;
	byState &= ((m_byMode & MODE_INT_ALL) | STAT_MOVEMENT_SINCE_READMOUSE);	// [TC] Keep "X/Y moved since last READMOUSE" for next MOUSE_READ (Contiki v1.3 uses this)

	if ( byState & STAT_INT_ALL )
	{
		m_byState |= byState;
		CpuIrqAssert(IS_MOUSE);
#ifdef _DEBUG_SPURIOUS_IRQ
		char szDbg[200]; sprintf(szDbg, "[MOUSE EVNT] 0x%02X Mode=0x%02X\n", m_byState, m_byMode); OutputDebugString(szDbg);
#endif
	}
}

int CMouseInterface::SyncEventCallback(int id, int cycles, ULONG /*uExecutedCycles*/)
{
	GetCardMgr().GetMouseCard()->OnMouseEvent(true);
	return NTSC_GetCyclesUntilVBlank(cycles);
}

void CMouseInterface::Clear()
{
	m_nBuffPos = 0;
	m_nDataLen = 1;

//	m_byMode = 0;	// Not for BeagleWrite / MultiScribe
	m_byState = 0;
	m_nX = 0;
	m_nY = 0;
	m_bBtn0 = false;
	m_bBtn1 = false;
	SetPositionAbs( 0, 0 );

//	CpuIrqDeassert(IS_MOUSE);
}

//===========================================================================

int CMouseInterface::ClampX()
{
	if ( m_iX > m_iMaxX )
	{
		m_iX = m_iMaxX;
		return 1;
	}
	else if ( m_iX < m_iMinX )
	{
		m_iX = m_iMinX;
		return -1;
	}

	return 0;
}

int CMouseInterface::ClampY()
{
	if ( m_iY > m_iMaxY )
	{
		m_iY = m_iMaxY;
		return 1;
	}
	else if ( m_iY < m_iMinY )
	{
		m_iY = m_iMinY;
		return -1;
	}

	return 0;
}

void CMouseInterface::SetClampX(int iMinX, int iMaxX)
{
	if ( (UINT)iMinX > 0xFFFF || (UINT)iMaxX > 0xFFFF )
	{
		_ASSERT(0);
		return;
	}
	if ( iMinX > iMaxX )
	{
		// For Blazing Paddles
		int iNewMaxX = (iMinX + iMaxX) & 0xFFFF;
		iMinX = 0;
		iMaxX = iNewMaxX;
	}
	m_iMaxX = iMaxX;
	m_iMinX = iMinX;
	ClampX();
}

void CMouseInterface::SetClampY(int iMinY, int iMaxY)
{
	if ( (UINT)iMinY > 0xFFFF || (UINT)iMaxY > 0xFFFF )
	{
		_ASSERT(0);
		return;
	}
	if ( iMinY > iMaxY )
	{
		// For Blazing Paddles
		int iNewMaxY = (iMinY + iMaxY) & 0xFFFF;
		iMinY = 0;
		iMaxY = iNewMaxY;
	}
	m_iMaxY = iMaxY;
	m_iMinY = iMinY;
	ClampY();
}

void CMouseInterface::SetPositionAbs(int x, int y)
{
	m_iX = x;
	m_iY = y;
	GetFrame().FrameSetCursorPosByMousePos();
}

void CMouseInterface::SetPositionRel(long dX, long dY, int* pOutOfBoundsX, int* pOutOfBoundsY)
{
	m_iX += dX;
	*pOutOfBoundsX = ClampX();

	m_iY += dY;
	*pOutOfBoundsY = ClampY();

	OnMouseEvent();
}

void CMouseInterface::SetButton(eBUTTON Button, eBUTTONSTATE State)
{
	m_bButtons[Button] = (State == BUTTON_DOWN);
	OnMouseEvent();
}

#define SS_YAML_VALUE_CARD_MOUSE "Mouse Card"

#define SS_YAML_KEY_MC6821 "MC6821"
#define SS_YAML_KEY_PRA "PRA"
#define SS_YAML_KEY_DDRA "DDRA"
#define SS_YAML_KEY_CRA "CRA"
#define SS_YAML_KEY_PRB "PRB"
#define SS_YAML_KEY_DDRB "DDRB"
#define SS_YAML_KEY_CRB "CRB"
#define SS_YAML_KEY_IA "IA"
#define SS_YAML_KEY_IB "IB"

#define SS_YAML_KEY_DATALEN "DataLen"
#define SS_YAML_KEY_MODE "Mode"
#define SS_YAML_KEY_6821B "6821B"
#define SS_YAML_KEY_6821A "6821A"
#define SS_YAML_KEY_BUFF "Buffer"
#define SS_YAML_KEY_BUFFPOS "Buffer Position"
#define SS_YAML_KEY_MOUSESTATE "State"
#define SS_YAML_KEY_X "X"
#define SS_YAML_KEY_Y "Y"
#define SS_YAML_KEY_BTN0 "Btn0"
#define SS_YAML_KEY_BTN1 "Btn1"
#define SS_YAML_KEY_VBL "VBL"
#define SS_YAML_KEY_IX "iX"
#define SS_YAML_KEY_IMINX "iMinX"
#define SS_YAML_KEY_IMAXX "iMaxX"
#define SS_YAML_KEY_IY "iY"
#define SS_YAML_KEY_IMINY "iMinY"
#define SS_YAML_KEY_IMAXY "iMaxY"
#define SS_YAML_KEY_BUTTON0 "Button0"
#define SS_YAML_KEY_BUTTON1 "Button1"
#define SS_YAML_KEY_ENABLED "Enabled"

std::string CMouseInterface::GetSnapshotCardName(void)
{
	static const std::string name(SS_YAML_VALUE_CARD_MOUSE);
	return name;
}

void CMouseInterface::SaveSnapshotMC6821(YamlSaveHelper& yamlSaveHelper, std::string key)
{
	mc6821_t mc6821;
	BYTE byIA;
	BYTE byIB;

	m_6821.Get6821(mc6821, byIA, byIB);

	YamlSaveHelper::Label label(yamlSaveHelper, "%s:\n", key.c_str());
	yamlSaveHelper.SaveUint(SS_YAML_KEY_PRA, mc6821.pra);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_DDRA, mc6821.ddra);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_CRA, mc6821.cra);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_PRB, mc6821.prb);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_DDRB, mc6821.ddrb);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_CRB, mc6821.crb);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_IA, byIA);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_IB, byIB);
}

void CMouseInterface::SaveSnapshot(YamlSaveHelper& yamlSaveHelper)
{
//	if (!m_bActive)
//		return;

	YamlSaveHelper::Slot slot(yamlSaveHelper, GetSnapshotCardName(), m_slot, 1);

	YamlSaveHelper::Label state(yamlSaveHelper, "%s:\n", SS_YAML_KEY_STATE);
	SaveSnapshotMC6821(yamlSaveHelper, SS_YAML_KEY_MC6821);
	yamlSaveHelper.Save("%s: %d\n", SS_YAML_KEY_DATALEN, m_nDataLen);
	yamlSaveHelper.SaveHexUint8(SS_YAML_KEY_MODE, m_byMode);
	yamlSaveHelper.SaveHexUint8(SS_YAML_KEY_6821B, m_by6821B);
	yamlSaveHelper.SaveHexUint8(SS_YAML_KEY_6821A, m_by6821A);

	// New label
	{
		YamlSaveHelper::Label buffer(yamlSaveHelper, "%s:\n", SS_YAML_KEY_BUFF);
		yamlSaveHelper.SaveMemory(m_byBuff, sizeof(m_byBuff));
	}

	yamlSaveHelper.Save("%s: %d\n", SS_YAML_KEY_BUFFPOS, m_nBuffPos);
	yamlSaveHelper.SaveHexUint8(SS_YAML_KEY_MOUSESTATE, m_byState);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_X, m_nX);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_Y, m_nY);
	yamlSaveHelper.SaveBool(SS_YAML_KEY_BTN0, m_bBtn0);
	yamlSaveHelper.SaveBool(SS_YAML_KEY_BTN1, m_bBtn1);
	yamlSaveHelper.SaveBool(SS_YAML_KEY_VBL, m_bVBL);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_IX, m_iX);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_IMINX, m_iMinX);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_IMAXX, m_iMaxX);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_IY, m_iY);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_IMINY, m_iMinY);
	yamlSaveHelper.SaveUint(SS_YAML_KEY_IMAXY, m_iMaxY);
	yamlSaveHelper.SaveBool(SS_YAML_KEY_BUTTON0, m_bButtons[0]);
	yamlSaveHelper.SaveBool(SS_YAML_KEY_BUTTON1, m_bButtons[1]);
	yamlSaveHelper.SaveBool(SS_YAML_KEY_ENABLED, m_bEnabled);
}

void CMouseInterface::LoadSnapshotMC6821(YamlLoadHelper& yamlLoadHelper, std::string key)
{
	if (!yamlLoadHelper.GetSubMap(key))
		throw std::runtime_error("Card: Expected key: " + key);

	mc6821_t mc6821;
	mc6821.pra  = yamlLoadHelper.LoadUint(SS_YAML_KEY_PRA);
	mc6821.ddra = yamlLoadHelper.LoadUint(SS_YAML_KEY_DDRA);
	mc6821.cra  = yamlLoadHelper.LoadUint(SS_YAML_KEY_CRA);
	mc6821.prb  = yamlLoadHelper.LoadUint(SS_YAML_KEY_PRB);
	mc6821.ddrb = yamlLoadHelper.LoadUint(SS_YAML_KEY_DDRB);
	mc6821.crb  = yamlLoadHelper.LoadUint(SS_YAML_KEY_CRB);

	BYTE byIA   = yamlLoadHelper.LoadUint(SS_YAML_KEY_IA);
	BYTE byIB   = yamlLoadHelper.LoadUint(SS_YAML_KEY_IB);

	m_6821.Set6821(mc6821, byIA, byIB);

	yamlLoadHelper.PopMap();
}

bool CMouseInterface::LoadSnapshot(YamlLoadHelper& yamlLoadHelper, UINT version)
{
	if (version != 1)
		throw std::runtime_error("Card: wrong version");

	LoadSnapshotMC6821(yamlLoadHelper, SS_YAML_KEY_MC6821);

	m_nDataLen = yamlLoadHelper.LoadUint(SS_YAML_KEY_DATALEN);
	m_byMode = yamlLoadHelper.LoadUint(SS_YAML_KEY_MODE);
	m_by6821B = yamlLoadHelper.LoadUint(SS_YAML_KEY_6821B);
	m_by6821A = yamlLoadHelper.LoadUint(SS_YAML_KEY_6821A);

	if (!yamlLoadHelper.GetSubMap(SS_YAML_KEY_BUFF))
		throw std::runtime_error("Card: Expected key: " SS_YAML_KEY_BUFF);
	yamlLoadHelper.LoadMemory(m_byBuff, sizeof(m_byBuff));
	yamlLoadHelper.PopMap();

	m_nBuffPos = yamlLoadHelper.LoadUint(SS_YAML_KEY_BUFFPOS);
	m_byState = yamlLoadHelper.LoadUint(SS_YAML_KEY_MOUSESTATE);
	m_nX = yamlLoadHelper.LoadInt(SS_YAML_KEY_X);
	m_nY = yamlLoadHelper.LoadInt(SS_YAML_KEY_Y);
	m_bBtn0 = yamlLoadHelper.LoadBool(SS_YAML_KEY_BTN0);
	m_bBtn1 = yamlLoadHelper.LoadBool(SS_YAML_KEY_BTN1);
	m_bVBL = yamlLoadHelper.LoadBool(SS_YAML_KEY_VBL);
	m_iX = yamlLoadHelper.LoadInt(SS_YAML_KEY_IX);
	m_iMinX = yamlLoadHelper.LoadInt(SS_YAML_KEY_IMINX);
	m_iMaxX = yamlLoadHelper.LoadInt(SS_YAML_KEY_IMAXX);
	m_iY = yamlLoadHelper.LoadInt(SS_YAML_KEY_IY);
	m_iMinY = yamlLoadHelper.LoadInt(SS_YAML_KEY_IMINY);
	m_iMaxY = yamlLoadHelper.LoadInt(SS_YAML_KEY_IMAXY);
	m_bButtons[0] = yamlLoadHelper.LoadBool(SS_YAML_KEY_BUTTON0);
	m_bButtons[1] = yamlLoadHelper.LoadBool(SS_YAML_KEY_BUTTON1);
	m_bEnabled = yamlLoadHelper.LoadBool(SS_YAML_KEY_ENABLED);	// MemInitializeIO() calls Initialize() which sets true

	if (m_byState & STAT_INT_ALL)	// GH#677
		CpuIrqAssert(IS_MOUSE);

	return true;
}