#include?“burnint.h“
#include?“8255ppi.h“

#define?MAX_PPIS		3

PPIPortRead?PPI0PortReadA;
PPIPortRead?PPI0PortReadB;
PPIPortRead?PPI0PortReadC;
PPIPortWrite?PPI0PortWriteA;
PPIPortWrite?PPI0PortWriteB;
PPIPortWrite?PPI0PortWriteC;
PPIPortRead?PPI1PortReadA;
PPIPortRead?PPI1PortReadB;
PPIPortRead?PPI1PortReadC;
PPIPortWrite?PPI1PortWriteA;
PPIPortWrite?PPI1PortWriteB;
PPIPortWrite?PPI1PortWriteC;
PPIPortRead?PPI2PortReadA;
PPIPortRead?PPI2PortReadB;
PPIPortRead?PPI2PortReadC;
PPIPortWrite?PPI2PortWriteA;
PPIPortWrite?PPI2PortWriteB;
PPIPortWrite?PPI2PortWriteC;

typedef?struct
{
	/*?mode?flags?*/
	UINT8?groupA_mode;
	UINT8?groupB_mode;
	UINT8?portA_dir;
	UINT8?portB_dir;
	UINT8?portCH_dir;
	UINT8?portCL_dir;

	/*?handshake?signals?（1=asserted;?0=non-asserted）?*/
	UINT8?obf_a;
	UINT8?obf_b;
	UINT8?ibf_a;
	UINT8?ibf_b;
	UINT8?inte_a;
	UINT8?inte_b;

	UINT8?in_mask[3];		/*?input?mask?*/
	UINT8?out_mask[3];	/*?output?mask?*/
	UINT8?read[3];		/*?data?read?from?ports?*/
	UINT8?latch[3];		/*?data?written?to?ports?*/
	UINT8?output[3];	/*?actual?output?data?*/
}?ppi8255;

static?ppi8255?chips[MAX_PPIS];

static?void?ppi8255_get_handshake_signals（ppi8255?*chip?UINT8?*result）
{
	UINT8?handshake?=?0x00;
	UINT8?mask?=?0x00;

	/*?group?A?*/
	if?（chip->groupA_mode?==?1）
	{
		if?（chip->portA_dir）
		{
			handshake?|=?chip->ibf_a???0x20?:?0x00;
			handshake?|=?（chip->ibf_a?&&?chip->inte_a）???0x08?:?0x00;
			mask?|=?0x28;
		}
		else
		{
			handshake?|=?chip->obf_a???0x00?:?0x80;
			handshake?|=?（chip->obf_a?&&?chip->inte_a）???0x08?:?0x00;
			mask?|=?0x88;
		}
	}
	else?if?（chip->groupA_mode?==?2）
??	{
		handshake?|=?chip->inte_a???0x08?:?0x00;
		handshake?|=?chip->obf_a???0x00?:?0x80;
		handshake?|=?chip->ibf_a???0x20?:?0x00;
		mask?|=?0xA8;
	}

	/*?group?B?*/
	if?（chip->groupB_mode?==?1）
??	{
		if?（chip->portA_dir）
		{
			handshake?|=?chip->ibf_b???0x02?:?0x00;
			handshake?|=?（chip->ibf_b?&&?chip->inte_b）???0x01?:?0x00;
			mask?|=?0x03;
??		}
		else
??		{
			handshake?|=?chip->obf_b???0x00?:?0x02;
			handshake?|=?（chip->obf_b?&&?chip->inte_b）???0x01?:?0x00;
			mask?|=?0x03;
		}
??	}

	*result?&=?~mask;
	*result?|=?handshake?&?mask;
}

static?void?ppi8255_write_port（ppi8255?*chip?int?port?int?chipnum）
{
	UINT8?write_data;

	write_data?=?chip->latch[port]?&?chip->out_mask[port];
	write_data?|=?0xFF?&?~chip->out_mask[port];

	/*?write?out?special?port?2?signals?*/
	if?（port?==?2）
		ppi8255_get_handshake_signals（chip?&write_data）;

	chip->output[port]?=?write_data;
	
	if?（chipnum?==?0?&&?port?==?0）?{
		if?（PPI0PortWriteA）?PPI0PortWriteA（write_data）;
	}
	
	if?（chipnum?==?0?&&?port?==?1）?{
		if?（PPI0PortWriteB）?PPI0PortWriteB（write_data）;
	}
	
	if?（chipnum?==?0?&&?port?==?2）?{
		if?（PPI0PortWriteC）?PPI0PortWriteC（write_data）;
	}
	
	if?（chipnum?==?1?&&?port?==?0）?{
		if?（PPI1PortWriteA）?PPI1PortWriteA（write_data）;
	}
	
	if?（chipnum?==?1?&&?port?==?1）?{
		if?（PPI1PortWriteB）?PPI1PortWriteB（write_data）;
	}
	
	if?（chipnum?==?1?&&?port?==?2）?{
		if?（PPI1PortWriteC）?PPI1P