

Types
	type=0	   data
	type=1	   mp3
	type=2	   telephone
	type=3	   sc4
	type=4	   reserved?

Wheres
	where=0	   main memory
	where=1	   card memory

Indices
	one byte to reference a file indexes >0x7f are in
	the card, no file has index=0

memsize word size of memory in units of 16K
memfree free memory in units of 16K

Opcode

0x1     Write mp3? file 
		-> Byte  1
		-> Byte  where 
		-> Byte  type 
		-> Dword size
		-> Word  blocks
		-> Byte  name[515]

		-> Byte block[0x3ff0]
		-> Byte 0
	
		   {
		-> Byte block[0x41f8]	
		-> Byte 0
		   }

		<- Byte index

0x2	Get file
		-> Byte  2
		-> Byte  index
		<- Dword size
		
		<- Byte block[0x3ff0]

		   {
		-> Byte 0	
		<- Byte ?
		<- Byte block[0x41f8]
		   }

0x3	Get directory
		-> Byte  3
		   {
		<- Byte  index
		<- Byte  type
		<- Dword size
		<- Byte  name[515]
		<- Byte  attr
		   } End is signaled by all of the above being 0
		<-  Byte  0xff

0x4	Get status
		-> Byte  4
	             
		<- Word  memsize    BASE
		<- Word  memfree?

		<- Word  memsize    CARD
		<- Word  memfree?

0x5	Erase	
		-> Byte  5
		-> Byte  index
		<- Byte  0

0x6	Format
		-> Byte  6
		-> Byte  where 
		<- Byte 0xff

0x7 	Get Play Order?
		-> Byte  7
		<- Byte gunk[8] (always seen 0x3a 0x68 0xa0 0x00 0x00 0x01 0x03 0x09)
		<- Byte order[250] 
			Array of indexes, terminated by zeros
		<- Byte q (Don't know what these are)
		<- Byte q


0x8

0x9 

0xa	Ping
		-> Byte 10
		<- Byte 1

I Think the point of these three
is to ensure the index number
is deterministic.

0xb     Download config.dat 
		same format as 0x1, type=0x0

0xc	Download encode.mas 
		same format as 0x1, type=0x4

0xd	Download decode.mas 
		same format as 0x1, type=0x4
		
0xe	Download serial.dat
		same format as 0x1, type=0x0

0x20	?????? (After format flash 0x6 0x1 )
		-> Byte 32
		<- Word 0xe698=59032 (with 8Mb card)

0x21	?????? (After 0x20)
		-> Byte 33	 (With 8Mb card)
		<- Byte 0

0x22	?????? (After 0x21) 
		-> Byte 34
		-> Word blocks   (80 with 8Mb card)
		   {
		-> Byte data[512];
		   }
		<- Byte 24 	 (With 8Mb Card)
	



	
