spcaddr.inc

linux下的任天堂模拟器代码。供大家参考。

;Copyright (C) 1997-2007 ZSNES Team ( zsKnight, _Demo_, pagefault, Nach )
;
;http://www.zsnes.com
;http://sourceforge.net/projects/zsnes
;https://zsnes.bountysource.com
;
;This program is free software; you can redistribute it and/or
;modify it under the terms of the GNU General Public License
;version 2 as published by the Free Software Foundation.
;
;This program is distributed in the hope that it will be useful,
;but WITHOUT ANY WARRANTY; without even the implied warranty of
;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;GNU General Public License for more details.
;
;You should have received a copy of the GNU General Public License
;along with this program; if not, write to the Free Software
;Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.



; A,DP addressing mode
%macro SPCaddr_DP 0
      mov bl,[ebp]
      add ebx,[spcRamDP]
      inc ebp
      ReadByte
%endmacro

%macro SPCaddr_DP_X 0
      mov bl,[ebp]
      add bl,[spcX]
      add ebx,[spcRamDP]
      inc ebp
      ReadByte
%endmacro

%macro SPCaddr_LABS 0
      mov bx,[ebp]
      add ebx,SPCRAM
      ReadByte
      add ebp,2
%endmacro

%macro SPCaddr_LABS_X 0
      mov bl,[spcX]
      add bx,[ebp]
      add ebp,2
      add ebx,SPCRAM
      ReadByte
%endmacro

; A,(X)
%macro SPCaddr__X_ 0
      mov bl,[spcX]
      add ebx,[spcRamDP]
      ReadByte
%endmacro

; A,labs+Y
%macro SPCaddr_LABS_Y 0
      mov bl,[spcY]
      add bx,[ebp]
      add ebp,2
      add ebx,SPCRAM
      ReadByte
%endmacro

; A,(DP,X)
%macro SPCaddr_bDP_Xb 0
      mov bl,[ebp]
      add bl,[spcX]
      xor eax,eax
      add ebx,[spcRamDP]
      inc ebp
      mov ax, [ebx]
      mov ebx,eax
      add ebx,SPCRAM
      ReadByte
%endmacro

%macro SPCaddr_bDPb_Y 0
      mov bl,[ebp]
      xor eax,eax
      add ebx,[spcRamDP]
      inc ebp
      mov ax,[ebx]
      add ax,[spcY]
      mov ebx,eax
      add ebx,SPCRAM
      ReadByte
%endmacro