New in 0.4:
- autoboot with \SYSTEM64\BOOT.INI
- proper SD reset sequence, might help with some cards
- more robust read routines

  0.4+:
- Fixed two T64 bugs, one affecting 32 MB and smaller cards,
  another affecting 64 MB and larger cards with 1-to-2^18 chance



Features:
- 1023 entries per directory
- Handles 247 chars long filenames. Only 34 chars displayed, but
  filename extension is found if it's within those 247 chars.
- 1351 mouse support
- D64 & T64 file support: you can browse disk/tape images and run
  programs directly from them. C= F also works.
- autostarting BOOT.INI version. Place it into SYSTEM64 directory.
  Press C= during boot to fall into MMC64 BIOS.


Keys:
- cursor up/dn	move selection
- F1		page up
- F7		page down
- F2		top
- F8		bottom

- C= C		card info
- C= F		file info

- RETURN	load and start program,	enter dir or d64/t64 image
	+ C=	load program without starting it
	+ CTRL	disable MMC64 after load

		C= and CTRL can be combined

- C= D		enter debugger
		debug keys:
			F1		backward $1000 bytes
			F3		backward $0100 bytes
			F5		forward $0100 bytes
			F7		forward $1000 bytes
			RUN/STOP	exit

		Debugging startup: press C= while inserting card.
		For partitioned media press C= RUN/STOP to exit
		MBR sector and to return to debugger with PBR.

		Card CSD/CID registers can be found at $8000/$8020
		after card insertion.


Program/T64 loader can load from $0200 to $ffff, D64 loader from
$0700 upwards. If load address is $0801 then it's started with RUN,
otherwise loader jumps to the start address (with interrupts
disabled and maximum amount of ROM visible). If non-basic program
is loaded without starting it, then normal BASIC init and warm
start is done. This is necessary with those programs that load
message to the screen but are runable.


To reset the browser just remove and reinsert card at any time.

To use Retro Replay with browser first load it from MMC64, then
reset, exit to basic with 2*F7, then sys2070. It is not possible
to use RR with autobooting version.
