6502/6502bench
1
0
Fork 0
mirror of https://github.com/fadden/6502bench.git synced 2024-11-29 10:50:28 +00:00
Code Issues Projects Releases Wiki Activity

Update NES symbols

Browse Source 
The PPU registers are mirrored from $2000-3FFF.
This commit is contained in:
Andy McFadden 2019-11-08 07:49:23 -08:00
parent ceb07c809e
commit b4519b2aa2
1 changed files with 19 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
SourceGen/RuntimeData/Nintendo/NES.sym65
View File

@ -5,16 +5,22 @@
*SYNOPSIS Nintendo Entertainment System registers
; PPU registers ($2000-2007, repeating every 8 bytes)
; PPU registers ($2000-2007, repeating every 8 bytes to $3FFF)
; (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
;
; pattern: 001? ???? ???? ?xxx
*MULTI_MASK %0010000000000000 %0010000000000000 %0000000000000111
PPUCTRL @ $2000 ;W VPHB SINN various
PPUMASK @ $2001 ;W BGRs bMmG various
PPUSTATUS @ $2002 ;R VSO- ---- various; read resets $2005/2006
OAMADDR @ $2003 ;W OAM read/write address
OAMDATA @ $2004 ;RW OAM data read/write
PPUSCROLL @ $2005 ;WW fine scroll position (two writes: X,Y)
PPUADDR @ $2006 ;WW PPU read/write address (two writes: MSB, LSB)
PPUDATA @ $2007 ;RW PPU data read/write
*MULTI_MASK
; APU and I/O registers
; (see https://wiki.nesdev.com/w/index.php/2A03)
@ -38,7 +44,10 @@ DMC_FREQ @ $4010 ;IL-- RRRR
DMC_RAW @ $4011 ;-DDD DDDD
DMC_START @ $4012 ;AAAA AAAA
DMC_LEN @ $4013 ;LLLL LLLL
OAMDMA @ $4014
OAMDMA @ $4014 ;AAAA AAAA OAM DMA high address
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)
; $4018-401F normally disabled, but used in test mode
; (see http://wiki.nesdev.com/w/index.php/CPU_Test_Mode)