4. List of Registers Ordered Alphabetically
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P  =  New register in Pandora chip set
p  =  Stuff added or changed in hires chips
H  =  New register in hires chips
h  =  stuff added or changed in hires chips

A  =  Agnus/Alice chip
D  =  Denise/Lisa chip
P  =  Paula chip

W  =  Write
R  =  Read
ER =  Early read. This is a DMA data transfer to RAM, from either the disk
      or from the blitter, Ram timing requires data to be on the bus
      earlier than microprocessor read cycles. These transfers are
      therefore initiated by Agnus timing, rather than a read address on
      the register address bus (RGA).