RCPU Specs.txt

Memory structure:
	0x0000		Zero page
	0x0100		P-stack
	0x0200		R-stack
	0x0300		bus
	0x0400		receiving bus
	0x0500		Ram

MMU OpCode:
	0x00 Map device in Reg A to redbus window.
	0x80 Get mapped device to A.
	
	0x01 Redbus Window offset to A
	0x81 Get RB window offset to A.
	
	0x02 Enable redbus
	0x82 Disable redbus
	
	0x03 Set external memory mapped window to A.
	0x83 Get memory mapped window to A.
	
	0x04 Enable external memory mapped window.
	0x84 Disable external memory mapped window.
	
	0x05 Set BRK address to A
	0x85 Get BRK address to A
	
	0x06 Set POR address to A
	0x86 Get POR address to A

	0xFF Output A register to MC logfile.

Display Registers:
	0x00 Memory access row.
	
	0x01 cursor x
	0x02 cursor y
	0x03 cursor mode (0: hidden, 1: solid, 2: blink)
	
	0x04 key buffer start (16 byte buffer)
	0x05 key buffer position
	0x06 key value at buffer start
	
	0x07 blit mode (1: fill, 2: invert; 3: shift)
	0x08 blit x start / fill value
	0x09 blit y start
	0x0A blit x offset
	0x0B blit y offset
	0x0C blit width
	0x0D blit height
	
	0x10 -> 0x60 display memory window

IO Expander:
	0x00-0x01: Read buffer (little endian)
	0x02-0x03: Output latch

Disk Drive:
	0x00-0x7F: Disk sector buffer
	0x80-0x81: Sector number
	0x82: Disk command:
		0: Idle/success
		1: Read Disk Name
		2: Write Disk Name
		3: Read Disk Serial
		4: Read Disk Sector
		5: Write Disk Sector
		0xFF: Command failure