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sa1regs.asm
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sa1regs.asm
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;Copyright (C) 1997-2008 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.
; SA-1 emulation. Information provided by Ivar of Snes9x.
; coded by zsKnight
; SDD-1 emulation. SDD-1 MMC reverse engineered by zsKnight,
; SDD-1 decompress Dark Force and John Weidman,
; - Add MMC support
; - Add end of DMA IRQ support
; - Add Char Conversion #1
; - Add Char Conversion #2
; - Add Memory Disables (Guess this isn't needed)
; IRQs - IRQ Clear (also clear 2300), IRQ Disable, and IRQ Enable
; Mario RPG Level-up not working - it was using one of the IRQ functions
; that no other place in the game is using, which I suppose is the cause
; of the problem, but it's been so long since I worked on SA-1, that
; I forgot which part.
%include "macros.mac"
EXTSYM regptra,regptwa,romdata,SA1Status,SDD1BankA,NumofBanks,BWUsed2
EXTSYM GetTime,GetDate,irqv2,irqv,nmiv2,nmiv,snesmmap,snesmap2
EXTSYM curypos,CurrentExecSA1,memaccessbankr8sdd1,memtabler8,AddrNoIncr
EXTSYM SA1_DMA_CC2
EXTSYM UpdateArithStuff
EXTSYM sa1dmairam
EXTSYM sa1dmabwram
%ifndef NO_DEBUGGER
EXTSYM debuggeron,debstop4
%endif
%include "cpu/regs.mac"
%include "cpu/regsw.mac"
SECTION .data
NEWSYM RTCData, db 0Fh,0,0,0,0,0,0,0,0,0,0,0,0,0,0Fh,0
NEWSYM RTCPtr, dd 0
NEWSYM RTCPtr2, dd 0
NEWSYM RTCRest, dd 0
SECTION .text
NEWSYM RTC2800
push ebx
cmp dword[RTCRest],100
; je .go
; inc dword[RTCRest]
; jmp .notfirst
.go
cmp dword[RTCPtr],0
jne near .notfirst
%ifndef NO_DEBUGGER
cmp byte[debuggeron],1
je near .notfirst
%endif
; fill time/date
push ebx
push eax
ccall GetTime
mov bl,al
and bl,0Fh
mov [RTCData+1],bl ; seconds
shr eax,4
mov bl,al
and bl,0Fh
mov [RTCData+2],bl
; jmp .done
shr eax,4
cmp word[RTCData+1],0
; jne .notminch
mov bl,al
and bl,0Fh
mov [RTCData+3],bl ; minutes
shr eax,4
mov bl,al
and bl,0Fh
mov [RTCData+4],bl
.notminch
; jmp .done
shr eax,4
mov bl,al
and bl,0Fh
mov [RTCData+5],bl ; hours
shr eax,4
mov bl,al
and bl,0Fh
mov [RTCData+6],bl
ccall GetDate
mov bl,al
and bl,0Fh
mov [RTCData+7],bl ; day
shr eax,4
mov bl,al
and bl,0Fh
mov bl,al
and bl,0Fh
mov [RTCData+8],bl
shr eax,4
mov bl,al
and bl,0Fh
mov [RTCData+9],bl ; month
shr eax,8
mov bl,al
and bl,0Fh
mov [RTCData+10],bl ; year
shr eax,4
mov bl,al
and bl,01Fh
xor bh,bh
.notokay
cmp bl,9
jbe .okay
inc bh
sub bl,10
jmp .notokay
.okay
mov [RTCData+11],bl
add bh,9
mov [RTCData+12],bh
shr eax,8
and al,0Fh
mov [RTCData+13],al ; day of week
.done
pop eax
pop ebx
.notfirst
mov ebx,[RTCPtr]
mov al,[RTCData+ebx]
inc dword[RTCPtr]
cmp dword[RTCPtr],0Fh
jne .notclear
mov dword[RTCPtr],0
.notclear
pop ebx
ret
NEWSYM RTC2801w
; mov byte[debstop3],1
mov dword[RTCRest],0
mov dword[RTCPtr],0
cmp al,0Eh
jne .notreset
mov dword[RTCPtr2],0
ret
.notreset
cmp al,0Dh
jne .notstop
mov dword[RTCPtr2],0
ret
.notstop
push ebx
mov ebx,[RTCPtr2]
cmp ebx,0
je .next
cmp ebx,13
ja .nomore
mov [RTCData+ebx],al
.next
inc dword[RTCPtr2]
.nomore
pop ebx
ret
; SA-1 Start
; ----------
SECTION .data
; IRQ Stuff
NEWSYM SA1Mode, dd 0 ; 0 = SNES CPU, 1 = SA1 CPU
NEWSYM SA1Control, dd 0
NEWSYM SA1BankPtr, dd 0
NEWSYM SA1ResetV, dd 0
NEWSYM SA1NMIV, dd 0
NEWSYM SA1IRQV, dd 0
NEWSYM SA1RV, dd 0
NEWSYM CurBWPtr, dd 0
NEWSYM SA1TempVar, dd 0
NEWSYM SA1IRQEn, dd 0
NEWSYM SA1Message, dd 0
NEWSYM SA1IRQExec, dd 0
NEWSYM SA1IRQEnable, dd 0
NEWSYM SA1DoIRQ, dd 0
; Arithmetic Stuff
NEWSYM SA1ARC, dd 0
NEWSYM SA1AR1, dd 0
NEWSYM SA1AR2, dd 0
NEWSYM SA1ARR1, dd 0
NEWSYM SA1ARR2,dd 0
NEWSYM SA1Stat, dd 0
NEWSYM SNSNMIV, dd 0
NEWSYM SNSIRQV, dd 0
NEWSYM SA1DMACount, dd 0
NEWSYM SA1DMAInfo, dd 0
NEWSYM SA1DMAChar, dd 0
NEWSYM SA1DMASource, dd 0
NEWSYM SA1DMADest, dd 0
NEWSYM SA1IRQTemp, dd 0
NEWSYM SA1BankSw, dd 1
NEWSYM SA1BankVal, db 0,1,2,3
NEWSYM BWShift, dd 0
NEWSYM BWAndAddr, dd 0
NEWSYM BWAnd, dd 0
NEWSYM BWRAnd, dd 0
NEWSYM SA1_in_cc1_dma, dd 0
NEWSYM SA1_CC2_line, dd 0
NEWSYM SA1_BRF, times 16 db 0
SA1Reserved times 432 db 0
; SA1 Swap Stuff
NEWSYM SA1xa, dd 0
NEWSYM SA1xx, dd 0
NEWSYM SA1xy, dd 0
NEWSYM SA1xd, dd 0
NEWSYM SA1xdb, dd 0
NEWSYM SA1xpb, dd 0
NEWSYM SA1xs, dd 0
NEWSYM SA1RegP, dd 0
NEWSYM SA1RegE, dd 0
NEWSYM SA1RegPCS,dd 0
NEWSYM SA1BWPtr,dd 0
NEWSYM SA1Ptr, dd 0 ; Current PC, SA-1
NEWSYM SA1Overflow, dd 0
NEWSYM VarLenAddr, dd 0
NEWSYM VarLenAddrB, dd 0
NEWSYM VarLenBarrel, dd 0
NEWSYM SA1TimerVal, dd 0
NEWSYM SA1TimerSet, dd 0
NEWSYM SA1TimerCount, dd 0
NEWSYM SA1IRQData, dd 0
; SNES Swap Stuff
NEWSYM SNSRegP, dd 0
NEWSYM SNSRegE, dd 0
NEWSYM SNSRegPCS,dd 0
NEWSYM SNSBWPtr,dd 0
NEWSYM SNSPtr, dd 0 ; Current PC, SNES
NEWSYM IRAM, times 2049 db 0 ;2 kbytes of iram
num2writesa1reg equ $-SA1Mode
NEWSYM PHnum2writesa1reg, dd num2writesa1reg
NEWSYM SA1RAMArea, dd 0
NEWSYM SA1Temp, dd 0
NEWSYM Sdd1Mode, dd 0
NEWSYM Sdd1Bank, dd 0
NEWSYM Sdd1Addr, dd 0
NEWSYM Sdd1NewAddr, dd 0
SECTION .text
%macro SA1QuickF 2
NEWSYM %1
mov [%2],al
ret
%endmacro
%macro BankSwitch 4
push ecx
push edx
push eax
mov [SA1BankVal+%1],al
mov ebx,snesmmap+%2*4
test al,80h
jz .noupper
cmp byte[NumofBanks],64
jne .BSBigBank
and eax,1
.BSBigBank
and eax,07h
shl eax,20
push eax
jmp .yesupper
.noupper
cmp byte[NumofBanks],64
jne .BSBigBank2
and eax,1
.BSBigBank2
and eax,07h
shl eax,20
push eax
mov eax,%4
.yesupper
mov ecx,20h
add eax,[romdata]
sub eax,8000h
.mmaploop
mov [ebx],eax
add eax,8000h
add ebx,4
dec ecx
jnz .mmaploop
pop eax
add eax,[romdata]
mov ecx,10h
mov ebx,snesmap2+%3*4
mov edx,snesmmap+%3*4
.mmaploop2
mov [ebx],eax
mov [edx],eax
add eax,10000h
add ebx,4
add edx,4
dec ecx
jnz .mmaploop2
pop eax
pop edx
pop ecx
ret
%endmacro
NEWSYM sa12220w
BankSwitch 0,0,0C0h,0
NEWSYM sa12221w
BankSwitch 1,20h,0D0h,100000h
NEWSYM sa12222w
BankSwitch 2,80h,0E0h,200000h
NEWSYM sa12223w
BankSwitch 3,0A0h,0F0h,300000h
%macro BankSwitchSDD1 2
push ecx
push edx
push eax
mov [SDD1BankA+%1],al
and eax,07h
shl eax,20
add eax,[romdata]
mov ecx,10h
mov ebx,snesmap2+%2*4
mov edx,snesmmap+%2*4
.mmaploop2
mov [ebx],eax
mov [edx],eax
add eax,10000h
add ebx,4
add edx,4
dec ecx
jnz .mmaploop2
pop eax
pop edx
pop ecx
ret
%endmacro
NEWSYM sdd14804
mov al,[SDD1BankA]
ret
NEWSYM sdd14805
mov al,[SDD1BankA+1]
ret
NEWSYM sdd14806
mov al,[SDD1BankA+2]
ret
NEWSYM sdd14807
mov al,[SDD1BankA+3]
ret
NEWSYM sdd14804w
BankSwitchSDD1 0,0C0h
NEWSYM sdd14805w
BankSwitchSDD1 1,0D0h
NEWSYM sdd14806w
BankSwitchSDD1 2,0E0h
NEWSYM sdd14807w
BankSwitchSDD1 3,0F0h
NEWSYM sa12200w
mov bl,al
and bl,0Fh
mov [SA1Message],bl
test al,80h
jz .noirq
or byte[SA1DoIRQ],1
.noirq
test al,10h
jz .nonmi
or byte[SA1DoIRQ],2
.nonmi
test byte[SA1Control],20h
jz .noreset
test al,20h
jnz .noreset
mov [SA1Control],al
mov ebx,[romdata]
mov [SA1BankPtr],ebx
xor ebx,ebx
mov bx,[SA1ResetV]
add ebx,[romdata]
sub ebx,8000h
mov [SA1Ptr],ebx
mov byte[SA1xpb],0
mov word[SA1xs],1FFh
mov ebx,[romdata]
sub ebx,8000h
mov [SA1RegPCS],ebx
xor ebx,ebx
ret
.noreset
mov [SA1Control],al
ret
NEWSYM sa12201w ; IRQ Enable
mov [SA1IRQEnable],al
ret
NEWSYM sa12202w ; IRQ Clear
test al,80h
jz .noirqclear
and byte[SA1IRQExec],0FEh
and byte[SA1DoIRQ],0FBh
.noirqclear
test al,20h
jz .nocdmairqclear
and byte[SA1IRQExec],0FDh
and byte[SA1DoIRQ],0F7h
.nocdmairqclear
ret
SA1QuickF sa12203w, SA1ResetV
SA1QuickF sa12204w, SA1ResetV+1
SA1QuickF sa12205w, SA1NMIV
SA1QuickF sa12206w, SA1NMIV+1
SA1QuickF sa12207w, SA1IRQV
SA1QuickF sa12208w, SA1IRQV+1
NEWSYM sa12209w ; IRQ Stuff
mov [SA1IRQData+1],al
test al,80h
jz .noirq
; execute IRQ on the SNES
or byte[SA1DoIRQ],4
.noirq
mov bl,al
and bl,0Fh
mov [SA1Message+1],bl
mov bx,[irqv2]
test al,40h
jz .noirqchange
mov bx,[SNSIRQV]
.noirqchange
mov [irqv],bx
mov bx,[nmiv2]
test al,10h
jz .nonmichange
mov bx,[SNSNMIV]
.nonmichange
mov [nmiv],bx
ret
SA1QuickF sa1220Aw, SA1IRQEn
NEWSYM sa1220Bw ; SA-1 IRQ Clear
test al,80h
jz .noirqclear
mov byte[SA1IRQExec+1],0
and byte[SA1DoIRQ],0FEh
.noirqclear
test al,20h
jz .nocdmairqclear
.nocdmairqclear
test al,10h
jz .nonmiclear
mov byte[SA1IRQExec+2],0
and byte[SA1DoIRQ],0FDh
.nonmiclear
ret
SA1QuickF sa1220Cw, SNSNMIV
SA1QuickF sa1220Dw, SNSNMIV+1
SA1QuickF sa1220Ew, SNSIRQV
SA1QuickF sa1220Fw, SNSIRQV+1
NEWSYM sa12224w ; BWRAM
mov bl,al
and ebx,1Fh
shl ebx,13
add ebx,[romdata]
add ebx,1024*4096-6000h
mov [SNSBWPtr],ebx
cmp byte[SA1Status],0
jne .nosnes
mov [CurBWPtr],ebx
.nosnes
ret
NEWSYM sa12225w ; BWRAM
mov [BWUsed2],al
test al,80h
jnz .upper
mov bl,al
and ebx,1Fh
shl ebx,13
add ebx,[romdata]
add ebx,1024*4096-6000h
mov [SA1BWPtr],ebx
cmp byte[SA1Status],0
je .nosa1b
mov [CurBWPtr],ebx
.nosa1b
mov byte[BWShift],0
mov byte[BWAndAddr],0
mov byte[BWAnd],0FFh
mov byte[BWRAnd],0h
ret
.upper
mov bl,al
and ebx,7Fh
test byte[SA1Overflow+1],80h
jz .16col
shl ebx,11
mov byte[BWShift],2
mov byte[BWAndAddr],03h
mov byte[BWAnd],03h
mov byte[BWRAnd],0FCh
jmp .4col
.16col
mov byte[BWShift],1
mov byte[BWAndAddr],01h
mov byte[BWAnd],0Fh
mov byte[BWRAnd],0F0h
and ebx,3Fh
shl ebx,12
.4col
add ebx,[romdata]
add ebx,1024*4096
mov [SA1BWPtr],ebx
cmp byte[SA1Status],0
je .nosa1
mov [CurBWPtr],ebx
.nosa1
; mov byte[debstop3],1
ret
NEWSYM sa12250w
mov [SA1ARC],al
mov byte[SA1ARC+1],1
test al,2
jz .notcumul
mov word[SA1ARR1],0
mov word[SA1ARR1+2],0
mov word[SA1ARR1+4],0
.notcumul
ret
NEWSYM sa12251w
mov [SA1AR1],al
mov byte[SA1ARC+1],1
ret
NEWSYM sa12252w
mov [SA1AR1+1],al
mov byte[SA1ARC+1],1
ret
NEWSYM sa12253w
mov [SA1AR2],al
mov byte[SA1ARC+1],1
ret
NEWSYM sa12254w
mov [SA1AR2+1],al
mov byte[SA1ARC+1],1
ccallv UpdateArithStuff
ret
NEWSYM sa12300r
mov al,[SA1Message+1]
test byte[SA1IRQExec],1
jz .notexecuted
or al,80h
.notexecuted
test byte[SA1IRQExec],2
jz .notexecutedi
or al,20h
.notexecutedi
mov bl,[SA1IRQData+1]
and bl,50h
or al,bl
ret
NEWSYM sa12301r
mov al,[SA1Message]
test byte[SA1IRQExec+1],1
jz .notexecuted
or al,80h
.notexecuted
ret
NEWSYM sa12306r
mov al,[SA1ARR1]
ret
NEWSYM sa12307r
mov al,[SA1ARR1+1]
ret
NEWSYM sa12308r
mov al,[SA1ARR1+2]
ret
NEWSYM sa12309r
mov al,[SA1ARR1+3]
ret
NEWSYM sa1230Ar
mov al,[SA1ARR2]
ret
NEWSYM sa1230Br
mov al,[SA1Overflow]
ret
NEWSYM IRamRead
mov al,[IRAM+ecx-3000h]
ret
NEWSYM IRamWrite
mov [IRAM+ecx-3000h],al
ret
NEWSYM IRamWrite2
mov [IRAM+ecx-3000h],al
xor dh,dh
ret
NEWSYM sa1223Fw
mov [SA1Overflow+1],al
ret
; Variable Length Data
NEWSYM sa12258w
mov [VarLenBarrel+2],al
mov bl,al
and bl,0Fh
cmp bl,0
jne .not0
mov bl,16
.not0
mov [VarLenBarrel+3],bl
test al,80h
jz .notchange
mov [VarLenBarrel],bl
mov [VarLenBarrel+1],bl
.notchange
ret
NEWSYM sa12259w
mov [VarLenAddr],al
mov [VarLenAddrB],al
mov byte[VarLenBarrel],0
mov byte[VarLenBarrel+1],0
ret
NEWSYM sa1225Aw
mov [VarLenAddr+1],al
mov [VarLenAddrB+1],al
mov byte[VarLenBarrel],0
mov byte[VarLenBarrel+1],0
ret
NEWSYM sa1225Bw
mov [VarLenAddr+2],al
mov [VarLenAddrB+2],al
mov byte[VarLenBarrel],0
mov byte[VarLenBarrel+1],0
ret
; Variable Length Read
NEWSYM sa1230Cr
push ecx
xor ebx,ebx
xor ecx,ecx
mov bl,[VarLenAddr+2]
mov cx,[VarLenAddr]
test ecx,8000h
jz .loweraddr
add ecx,[snesmmap+ebx*4]
jmp .upperaddr
.loweraddr
add ecx,[snesmap2+ebx*4]
.upperaddr
mov ebx,[ecx]
mov cl,[VarLenBarrel+1]
shr ebx,cl
mov al,bl
pop ecx
test byte[VarLenBarrel+2],80h
jnz .autoinc
ret
.autoinc
mov bl,[VarLenBarrel+3]
add [VarLenBarrel],bl
mov bl,[VarLenBarrel]
cmp bl,16
jbe .notover
sub byte[VarLenBarrel],16
add dword[VarLenAddr],2
mov byte[VarLenAddr+3],0
.notover
ret
NEWSYM sa1230Dr
push ecx
xor ebx,ebx
xor ecx,ecx
mov bl,[VarLenAddrB+2]
mov cx,[VarLenAddrB]
test ecx,8000h
jz .loweraddr
add ecx,[snesmmap+ebx*4]
jmp .upperaddr
.loweraddr
add ecx,[snesmap2+ebx*4]
.upperaddr
mov ebx,[ecx]
mov cl,[VarLenBarrel+1]
shr ebx,cl
mov al,bh
pop ecx
test byte[VarLenBarrel+2],80h
jnz .autoinc
ret
.autoinc
mov bl,[VarLenBarrel+3]
add [VarLenBarrel+1],bl
mov bl,[VarLenBarrel+1]
cmp bl,16
jbe .notover
sub byte[VarLenBarrel+1],16
add dword[VarLenAddrB],2
mov byte[VarLenAddrB+3],0
.notover
ret
NEWSYM sa1230Er
mov al,10h
ret
; Approximate H loc
NEWSYM sa12302r
test byte[SA1TimerSet],80h
jnz .timeron
mov al,[CurrentExecSA1]
shl al,2
add al,dh
ret
.timeron
mov al,[SA1TimerCount]
ret
NEWSYM sa12303r
test byte[SA1TimerSet],80h
jnz .timeron
mov al,[CurrentExecSA1]
shr al,3
ret
.timeron
mov al,[SA1TimerCount+1]
and al,1
ret
NEWSYM sa12304r
test byte[SA1TimerSet],80h
jnz .timeron
mov al,[curypos]
ret
.timeron
mov bx,[SA1TimerCount+1]
shr bx,1
mov al,bl
ret
NEWSYM sa12305r
test byte[SA1TimerSet],80h
jnz .timeron
mov al,[curypos+1]
ret
.timeron
mov bx,[SA1TimerCount+2]
shr bx,1
mov al,bl
and al,1
ret
NEWSYM sa12210w ; Timer Settings
mov [SA1TimerSet],al
ret
NEWSYM sa12211w ; Timer Clear
mov dword[SA1TimerVal],0
ret
NEWSYM sa12212w
mov [SA1TimerCount],al
ret
NEWSYM sa12213w
mov [SA1TimerCount+1],al
ret
NEWSYM sa12214w
mov [SA1TimerCount+2],al
ret
NEWSYM sa12215w
mov [SA1TimerCount+3],al
ret
NEWSYM sa12230w
test al,80h
jnz .nodmaline
mov dword[SA1_CC2_line],0
.nodmaline
mov [SA1DMAInfo],al
ret
NEWSYM sa12231w
mov [SA1DMAChar],al
test al,80h
jz .nodmaend
mov dword[SA1_in_cc1_dma],0
.nodmaend
; if b7=1, then end of chdma process
ret
SA1QuickF sa12232w, SA1DMASource
SA1QuickF sa12233w, SA1DMASource+1
SA1QuickF sa12234w, SA1DMASource+2
SA1QuickF sa12235w, SA1DMADest
NEWSYM sa12236w
mov [SA1DMADest+1],al
test byte[SA1DMAInfo],10h
jnz near sa1chconv
test byte[SA1DMAInfo],4
jnz .noiram
ccallv sa1dmairam
.noiram
ret
NEWSYM sa12237w
mov [SA1DMADest+2],al
test byte[SA1DMAInfo],10h
jnz .nobwram
test byte[SA1DMAInfo],4
jz .nobwram
ccallv sa1dmabwram
.nobwram
ret
NEWSYM sa12238w
mov [SA1DMACount],al
ret
NEWSYM sa12239w
mov [SA1DMACount+1],al
ret
SECTION .bss
NEWSYM sa1dmaptr, resd 1
NEWSYM sa1dmaptrs, resd 1
SECTION .text
%macro setbit2b 3
test al,%1
jz %%nosb
or word[ebx+%3],%2
%%nosb
%endmacro
%macro do2bit 1
mov al,[edx+%1]
setbit2b 01h,0080h>>4*%1,0
setbit2b 02h,8000h>>4*%1,0
setbit2b 04h,0040h>>4*%1,0
setbit2b 08h,4000h>>4*%1,0
setbit2b 10h,0020h>>4*%1,0
setbit2b 20h,2000h>>4*%1,0
setbit2b 40h,0010h>>4*%1,0
setbit2b 80h,1000h>>4*%1,0
%endmacro
%macro do4bit 1
mov al,[edx+%1]
setbit2b 01h,0080h>>2*%1,0
setbit2b 02h,8000h>>2*%1,0
setbit2b 04h,0080h>>2*%1,16
setbit2b 08h,8000h>>2*%1,16
setbit2b 10h,0040h>>2*%1,0
setbit2b 20h,4000h>>2*%1,0
setbit2b 40h,0040h>>2*%1,16
setbit2b 80h,4000h>>2*%1,16
%endmacro
%macro do8bit 1
mov al,[edx+%1]
setbit2b 01h,0080h>>1*%1,0
setbit2b 02h,8000h>>1*%1,0
setbit2b 04h,0080h>>1*%1,16
setbit2b 08h,8000h>>1*%1,16
setbit2b 10h,0080h>>1*%1,32
setbit2b 20h,8000h>>1*%1,32
setbit2b 40h,0080h>>1*%1,48
setbit2b 80h,8000h>>1*%1,48
%endmacro
; Character Conversion DMA
sa1chconv:
; or byte[SA1DoIRQ],4
or byte[SA1DoIRQ],8
; mov byte[debstop3],1
; test byte[SA1DMAChar],3
; jnz .no8bit
mov dword[SA1_in_cc1_dma],1
ret
.no8bit
mov ebx,[SA1DMADest]
%ifndef NO_DEBUGGER
mov byte[debstop4],1
%endif
; and ebx,7FFh
and ebx,3FFFFh
add ebx,[SA1RAMArea]
mov [sa1dmaptr],ebx
mov ebx,[SA1DMASource]
and ebx,3FFFFh
add ebx,[SA1RAMArea]
mov [sa1dmaptrs],ebx
; 4 colors = 32 bytes, 16 colors = 64 bytes, 256 colors = 128 bytes
; SA1DMAChar,bit 2-4 = # of 8x8 tiles/horizontal row (0=1,1=2,2=3,..,5=32)
; SA1DMAChar,bit 0-1 = Color Mode (0=8b,1=4b,2=2b,3=?)
test byte[SA1DMAChar],2
jnz near .2bit
test byte[SA1DMAChar],1
jnz near .4bit
.8bit
pushad
mov edx,[sa1dmaptrs]
mov ebx,[romdata]
add ebx,4096*1024+1024*1024
mov edi,16*2
.loop38b
push ebx
push edx
mov ecx,32
.loop8b
mov esi,8
push ebx
push edx
.loop28b
mov word[ebx],0
mov word[ebx+16],0
mov word[ebx+32],0
mov word[ebx+48],0
do8bit 7
do8bit 6
do8bit 5
do8bit 4
do8bit 3
do8bit 2
do8bit 1
do8bit 0
add ebx,2
add edx,128*2
dec esi
jnz near .loop28b
pop edx
pop ebx
add edx,4*2
add ebx,32*2
dec ecx
jnz near .loop8b
pop edx
pop ebx
add edx,128*8*2
add ebx,128*8*2
dec edi
jnz near .loop38b
mov ecx,10000h
mov edx,[sa1dmaptrs]
mov ebx,[romdata]
add ebx,4096*1024+1024*1024
.next8b
mov al,[ebx]
mov [edx],al
inc ebx
inc edx
dec ecx
jnz .next8b
popad
ret
.4bit
pushad
mov edx,[sa1dmaptrs]
mov ebx,[romdata]
add ebx,4096*1024+1024*1024
mov edi,16
.loop34b
push ebx