Function IORead_C07x

source/Memory.cpp:753–781

//-------------------------------------

static BYTE __stdcall IORead_C07x(WORD pc, WORD addr, BYTE bWrite, BYTE d, ULONG nExecutedCycles)
{
	// Apple//e TRM, pg-258: "Reading or writing any address in the range $C070-$C07F also triggers the paddle timer and resets the VBLINT(*)." (*) //c only!
	JoyResetPosition(nExecutedCycles);  //$C07X Analog input reset

	switch (addr & 0xf)
	{
	case 0x0:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0x1:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0x2:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0x3:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0x4:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0x5:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0x6:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0x7:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0x8:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0x9:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0xA:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0xB:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0xC:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0xD:	return IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0xE:	return IS_APPLE2C()			? MemReadFloatingBus(SW_IOUDIS ? true : false, nExecutedCycles)	// GH#636
											: IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	case 0xF:	return IsEnhancedIIEorIIC()	? MemReadFloatingBus(GetVideo().VideoGetSWDHIRES(), nExecutedCycles)		// GH#636
											: IO_Null(pc, addr, bWrite, d, nExecutedCycles);
	}

	return 0;
}

static BYTE __stdcall IOWrite_C07x(WORD pc, WORD addr, BYTE bWrite, BYTE d, ULONG nExecutedCycles)
{