/******************************************************************************
 ******************************************************************************
 *** From <emulator>/SrcShared/Bank_ROM.cpp
 ******************************************************************************
 ******************************************************************************/

// ===========================================================================
//		¥ Flash Bank Accessors
// ===========================================================================
// These functions provide fetch and store access to the emulator's read only
// memory.

/*
	There are five types of flash that our flash manager routines identify:
	Mitsubishi, Hitachi, Intel, AMD, and Fujitsu.  Of these, only the last
	two are really supported right now.  Unfortunately, they are the hardest
	to emulate.  :-(

	To identify the kind of flash being used, our ROM routines:

		- Read a word from FLASHBASE
		- Write 0x00FF to FLASHBASE
		- Read a word from FLASHBASE
		- Write 0x0090 to FLASHBASE
		- Read a manufacturer ID (word) from FLASHBASE
		- Read a device ID (word) from FLASHBASE + 2
		- Write 0x00FF to FLASHBASE

	Mitsubishi: manufacturer == 0x001C, device == 0x005E
	Hitachi:	manufacturer == 0x0007, device == 0x0086
	Intel:		manufacturer == 0x0089, device == 0x0091

	If the flash is not one of those, our ROM routines:

		- Read a word from FLASHBASE
		- Write 0x00F0 to FLASHBASE
		- Write 0x00AA to FLASHBASE + 0xAAAA
		- Write 0x0055 to FLASHBASE + 0x5554
		- Write 0x0090 to FLASHBASE + 0xAAAA
		- Read a manufacturer ID (word) from FLASHBASE
		- Read a device ID (word) from FLASHBASE + 2
		- Write 0x00F0 to FLASHBASE

	AMD:		manufacturer == 0x0001, device == 0x0049
	Fujitsu:	manufacturer == 0x0004, device == 0x0049


	To erase a word of flash, our ROM routines:

		AMD, Fujitsu:

		- Read a word from FLASHBASE
		- Write 0x00F0 to FLASHBASE
		- Write 0x00AA to FLASHBASE + 0xAAAA
		- Write 0x0055 to FLASHBASE + 0x5554
		- Write 0x0080 to FLASHBASE + 0xAAAA
		- Write 0x00AA to FLASHBASE + 0xAAAA
		- Write 0x0055 to FLASHBASE + 0x5554
		- Write 0x0030 to location to be erased
		- Check erase location for 0x0080
		- Read from FLASHBASE
		- Write 0x00F0 to FLASHBASE

		Mitsubishi, Hitachi:

		- Read a word from FLASHBASE
		- Write 0x00FF to FLASHBASE
		- Write 0x0020 to FLASHBASE
		- Write 0x00D0 to location to be erased
		- Check erase location for 0x0080
			-- If 0x0020 is also set, an error occured
		- Read from FLASHBASE
		- Write 0x00FF to FLASHBASE

		Intel

		- Not supported

	To program a block of flash:

		AMD, Fujitsu:

		- Read a word from FLASHBASE
		- Write 0x00F0 to FLASHBASE
		- For each word to write
			- If the word is already there, continue
			- Write 0x00AA to FLASHBASE + 0xAAAA
			- Write 0x0055 to FLASHBASE + 0x5554
			- Write 0x00A0 to FLASHBASE + 0xAAAA
			- Write the word to the dest location
			- Check write location for 0x0080
		- Read from FLASHBASE
		- Write 0x00F0 to FLASHBASE

		Mitsubishi, Hitachi, Intel:

		- Not supported
*/