mirror of
https://github.com/fadden/6502bench.git
synced 2024-11-12 06:06:12 +00:00
45 lines
1.7 KiB
Plaintext
45 lines
1.7 KiB
Plaintext
; Copyright 2018 faddenSoft. All Rights Reserved.
|
|
; See the LICENSE.txt file for distribution terms (Apache 2.0).
|
|
;
|
|
; Adapted from various online references, notably https://wiki.nesdev.com/
|
|
|
|
*SYNOPSIS Nintendo Entertainment System registers
|
|
|
|
; PPU registers ($2000-2007, repeating every 8 bytes)
|
|
; (see https://wiki.nesdev.com/w/index.php/PPU_registers)
|
|
PPUCTRL @ $2000 ;VPHB SINN various
|
|
PPUMASK @ $2001 ;BGRs bMmG various
|
|
PPUSTATUS @ $2002 ;VSO- ---- various
|
|
OAMADDR @ $2003 ;OAM read/write address
|
|
OAMDATA @ $2004 ;OAM data read/write
|
|
PPUSCROLL @ $2005 ;fine scroll position (two writes: X,Y)
|
|
PPUADDR @ $2006 ;PPU read/write address (two writes: MSB, LSB)
|
|
PPUDATA @ $2007 ;PPU data read/write
|
|
|
|
; APU and I/O registers
|
|
; (see https://wiki.nesdev.com/w/index.php/2A03)
|
|
SQ1_VOL @ $4000 ;DDLC VVVV
|
|
SQ1_SWEEP @ $4001 ;EPPP NSSS
|
|
SQ1_LO @ $4002 ;TTTT TTTT
|
|
SQ1_HI @ $4003 ;LLLL LTTT
|
|
SQ2_VOL @ $4004 ;DDLC VVVV
|
|
SQ2_SWEEP @ $4005 ;EPPP NSSS
|
|
SQ2_LO @ $4006 ;TTTT TTTT
|
|
SQ2_HI @ $4007 ;LLLL LTTT
|
|
TRI_LINEAR @ $4008 ;CRRR RRRR
|
|
TRI_UNU @ $4009
|
|
TRI_LO @ $400a ;TTTT TTTT
|
|
TRI_HI @ $400b ;LLLL LTTT
|
|
NOISE_VOL @ $400c ;--LC VVVV
|
|
NOISE_UNU @ $400d
|
|
NOISE_LO @ $400e ;L--- PPPP
|
|
NOISE_HI @ $400f ;LLLL L---
|
|
DMC_FREQ @ $4010 ;IL-- RRRR
|
|
DMC_RAW @ $4011 ;-DDD DDDD
|
|
DMC_START @ $4012 ;AAAA AAAA
|
|
DMC_LEN @ $4013 ;LLLL LLLL
|
|
OAMDMA @ $4014
|
|
SND_CHN @ $4015 ;W:---D NT21 R:IF-D NT21
|
|
JOY1 @ $4016 ;joystick 1 data (R) and joystick strobe (W)
|
|
JOY2 @ $4017 ;joystick 2 data (R) and frame counter (W)
|