87 lines
2.0 KiB
NASM
87 lines
2.0 KiB
NASM
;Copyright (C) 1997-2005 ZSNES Team ( zsKnight, _Demo_, pagefault, Nach )
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;
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;http://www.zsnes.com
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;http://sourceforge.net/projects/zsnes
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;
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;This program is free software; you can redistribute it and/or
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;modify it under the terms of the GNU General Public License
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;as published by the Free Software Foundation; either
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;version 2 of the License, or (at your option) any later
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;version.
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;
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;This program is distributed in the hope that it will be useful,
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;but WITHOUT ANY WARRANTY; without even the implied warranty of
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;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;GNU General Public License for more details.
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;
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;You should have received a copy of the GNU General Public License
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;along with this program; if not, write to the Free Software
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;Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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%include "macros.mac"
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EXTSYM dsp4_address,dsp4_byte,DSP4GetByte,DSP4SetByte
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EXTSYM regaccessbankr16,regaccessbankr8,regaccessbankw16,regaccessbankw8
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SECTION .text
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NEWSYM DSP4Read8b
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test ecx,8000h
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jnz .dsp4area
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jmp regaccessbankr8
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.dsp4area
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mov word[dsp4_address],cx
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pushad
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call DSP4GetByte
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popad
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mov al,byte[dsp4_byte]
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ret
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NEWSYM DSP4Write8b
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test ecx,8000h
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jnz .dsp4area
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jmp regaccessbankw8
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.dsp4area
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mov word[dsp4_address],cx
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mov byte[dsp4_byte],al
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pushad
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call DSP4SetByte
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popad
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ret
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NEWSYM DSP4Read16b
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test ecx,8000h
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jnz .dsp4area
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jmp regaccessbankr16
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.dsp4area
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mov word[dsp4_address],cx
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pushad
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call DSP4GetByte
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popad
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mov al,byte[dsp4_byte]
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inc word[dsp4_address]
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pushad
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call DSP4GetByte
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popad
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mov ah,byte[dsp4_byte]
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ret
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NEWSYM DSP4Write16b
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test ecx,8000h
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jnz .dsp4area
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jmp regaccessbankw16
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.dsp4area
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mov word[dsp4_address],cx
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mov byte[dsp4_byte],al
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mov byte[dsp4temp],ah
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pushad
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call DSP4SetByte
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mov ah,byte[dsp4temp]
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mov byte[dsp4_byte],ah
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inc word[dsp4_address]
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call DSP4SetByte
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popad
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ret
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SECTION .bss
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NEWSYM dsp4temp, resb 1 |