PPUCTRL = $2000
PPUMASK = $2001
PPUSTATUS = $2002
OAMADDR = $2003
OAMDATA = $2004
PPUSCROLL = $2005
PPUADDR = $2006
PPUDATA = $2007
OAMDMA = $4014
SND_CHN = $4015
JOY1 = $4016
JOY2 = $4017

; APU registers
APUPULSE1CTRL       = $4000
APUPULSE1SWEEP      = $4001
APUPULSE1TIMERLO    = $4002
APUPULSE1TIMERHI    = $4003
APUPULSE2CTRL       = $4004
APUPULSE2SWEEP      = $4005
APUPULSE2TIMERLO    = $4006
APUPULSE2TIMERHI    = $4007
APUTRIANGLECTRL     = $4008
APUTRIANGLETIMERLO  = $400A
APUTRIANGLETIMERHI  = $400B
APUNOISECTRL        = $400C
APUNOISEPERIOD      = $400E
APUNOISELENGTH      = $400F
APUDMCCTRL          = $4010
APUDMCDIRECT        = $4011
APUDMCADDR          = $4012
APUDMCLENGTH        = $4013