INIT.DOC
-or-
Things that happen before you see a diagnostic screen, and what they mean

Last edited : 22JUL92 : RWS
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First, after fetching the magic number from $FA0000 ($FA52235F)
the TOS ROMs jump to $FA0004.

Then:	RESET Instruction
	CPU VBR set to 0
	FF8006 is read twice.
	The Video Master Control ($ff82c0, I think is written)
	FF8007 is written with #$5
	Palette+2 is set to 1 as a debug flag
	
	Next, RAM is sized by writing to just above where we think RAM
	ends, and checking to see if the value written can be read back

	If a 14MB RAM board is present, a quick address check is run to
	be sure all address bits are there and not shorted. If this fails,
	the screen should flash red and white.

	Next, RAM is tested to see if there's a place to put the system stack
	and variables. Failiures should be logged to the SCC serial port.
	If the SCC doesn't work, we're stuck about here, RAM good or not.
	
	The vector table is copied from ROM to location 8 & up
	
	Palette+$a is set to 3 as a debug flag.

	Video is enabled and initialized

	Bit 5 of $ff8007 is set.

	'Testing FPU' is printed to the screen
	If the FPU is not installed and Bus Errors are not lengthened,	
	the message 'Rev 1 COMBEL installed' will be printed.

	The PSG is initialized. The DAC Record Control in SDMA is written.
	in rev 3 versions of the test, bus errors are disabled before this
	by writing $01 to $FF8007. If SDMA is bad, the test will probably
	hang at this point.

	Bus Errors are tested by writing to location 0.

	$FF8007 is set to turn on 16 MHz (if not already) and set the
	blitter clock = cpu clock.
	
	Interrupts of level 5 or above are enabled.

	The IDE drive is reset (maybe, depends on bit definitions)
	
	The MFP and system/video timers and counters are tested. (Timing Test)

	The keyboard is initialized. If it does not respond, or responds with an
	error code, the message 'Use RS232 terminal' is printed and all I/O takes
	place via the SCC channel.

	Then the code jumps to the main menu. If a loopback plug is installed in
	the SCC serial port, it will not be used for I/O.