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26a919a8c0a101f6f1504f72c36a54453a3b22c0
ZSNES/zsnes/src/cpu/regs.inc
pagefault 26a919a8c0 IO latch behaviour
2003-05-05 16:58:57 +00:00

1495 lines
36 KiB
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;Copyright (C) 1997-2001 ZSNES Team ( zsknight@zsnes.com / _demo_@zsnes.com )
;
;This program is free software; you can redistribute it and/or
;modify it under the terms of the GNU General Public License
;as published by the Free Software Foundation; either
;version 2 of the License, or (at your option) any later
;version.
;
;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.
EXTSYM SFXEnable,regptr,initsfxregsr,initSA1regs,SA1Enable,initSDD1regs
EXTSYM SPC7110Enable,initSPC7110regs,RTCEnable,RTCReset
EXTSYM curypos,cycpl,debuggeron,pdh
EXTSYM vram
EXTSYM romispal
EXTSYM reg1read,spcnumread,spchalted,spcon
EXTSYM reg2read
EXTSYM reg3read
EXTSYM reg4read
EXTSYM JoyEOrig,JoyENow
EXTSYM snesmouse
EXTSYM cycphb,joycontren,totlines
EXTSYM DosExit,invalid,numinst,previdmode,printhex,printnum
NEWSYM initregr
; Fill register pointer with invalid register accesses
mov edi,[regptr]
add edi,8000h
mov ecx,3000h
mov eax,regINVALID
.loopa
mov [edi],eax
add edi,4
dec ecx
jnz .loopa
; Set all valid register accesses
setreg 2100h*4,reg2100r
setreg 2134h*4,reg2134r
setreg 2135h*4,reg2135r
setreg 2136h*4,reg2136r
setreg 2137h*4,reg2137r
setreg 2138h*4,reg2138r
setreg 2139h*4,reg2139r
setreg 213Ah*4,reg213Ar
setreg 213Bh*4,reg213Br
setreg 213Ch*4,reg213Cr
setreg 213Dh*4,reg213Dr
setreg 213Eh*4,reg213Er
setreg 213Fh*4,reg213Fr
setreg 2140h*4,reg2140r
setreg 2141h*4,reg2141r
setreg 2142h*4,reg2142r
setreg 2143h*4,reg2143r
setreg 2144h*4,reg2140r
setreg 2180h*4,reg2180r
setreg 2A00h*4,reg2Axxr
setreg 2A01h*4,reg2Axxr
setreg 2A02h*4,reg2Axxr
setreg 2A03h*4,reg2Axxr
setreg 2A04h*4,reg2Axxr
setreg 2A05h*4,reg2Axxr
setreg 2A06h*4,reg2Axxr
setreg 2A07h*4,reg2Axxr
setreg 2A08h*4,reg2Axxr
setreg 2A09h*4,reg2Axxr
setreg 2A0Ah*4,reg2Axxr
setreg 2A0Bh*4,reg2Axxr
setreg 2A0Ch*4,reg2Axxr
setreg 2A0Dh*4,reg2Axxr
setreg 2A0Eh*4,reg2Axxr
setreg 2A0Fh*4,reg2Axxr
setreg 2A10h*4,reg2Axxr
setreg 2A11h*4,reg2Axxr
setreg 2A12h*4,reg2Axxr
setreg 2A13h*4,reg2Axxr
setreg 2A14h*4,reg2Axxr
setreg 2A15h*4,reg2Axxr
setreg 2A16h*4,reg2Axxr
setreg 2A17h*4,reg2Axxr
setreg 2A18h*4,reg2Axxr
setreg 2A19h*4,reg2Axxr
setreg 2A1Ah*4,reg2Axxr
setreg 2A1Bh*4,reg2Axxr
setreg 2A1Ch*4,reg2Axxr
setreg 2A1Dh*4,reg2Axxr
setreg 2A1Eh*4,reg2Axxr
setreg 2A1Fh*4,reg2Axxr
setreg 2A20h*4,reg2Axxr
setreg 2A21h*4,reg2Axxr
setreg 2A22h*4,reg2Axxr
setreg 2A23h*4,reg2Axxr
setreg 2A24h*4,reg2Axxr
setreg 2A25h*4,reg2Axxr
setreg 2A26h*4,reg2Axxr
setreg 2A27h*4,reg2Axxr
setreg 2A28h*4,reg2Axxr
setreg 2A29h*4,reg2Axxr
setreg 2A2Ah*4,reg2Axxr
setreg 2A2Bh*4,reg2Axxr
setreg 2A2Ch*4,reg2Axxr
setreg 2A2Dh*4,reg2Axxr
setreg 2A2Eh*4,reg2Axxr
setreg 2A2Fh*4,reg2Axxr
setreg 2A30h*4,reg2Axxr
setreg 2A31h*4,reg2Axxr
setreg 2A32h*4,reg2Axxr
setreg 2A33h*4,reg2Axxr
setreg 2A34h*4,reg2Axxr
setreg 2A35h*4,reg2Axxr
setreg 2A36h*4,reg2Axxr
setreg 2A37h*4,reg2Axxr
setreg 2A38h*4,reg2Axxr
setreg 2A39h*4,reg2Axxr
setreg 2A3Ah*4,reg2Axxr
setreg 2A3Bh*4,reg2Axxr
setreg 2A3Ch*4,reg2Axxr
setreg 2A3Dh*4,reg2Axxr
setreg 2A3Eh*4,reg2Axxr
setreg 2A3Fh*4,reg2Axxr
setreg 2A40h*4,reg2Axxr
setreg 2A41h*4,reg2Axxr
setreg 2A42h*4,reg2Axxr
setreg 2A43h*4,reg2Axxr
setreg 2A44h*4,reg2Axxr
setreg 2A45h*4,reg2Axxr
setreg 2A46h*4,reg2Axxr
setreg 2A47h*4,reg2Axxr
setreg 2A48h*4,reg2Axxr
setreg 2A49h*4,reg2Axxr
setreg 2A4Ah*4,reg2Axxr
setreg 2A4Bh*4,reg2Axxr
setreg 2A4Ch*4,reg2Axxr
setreg 2A4Dh*4,reg2Axxr
setreg 2A4Eh*4,reg2Axxr
setreg 2A4Fh*4,reg2Axxr
setreg 2A50h*4,reg2Axxr
setreg 2A51h*4,reg2Axxr
setreg 2A52h*4,reg2Axxr
setreg 2A53h*4,reg2Axxr
setreg 2A54h*4,reg2Axxr
setreg 2A55h*4,reg2Axxr
setreg 2A56h*4,reg2Axxr
setreg 2A57h*4,reg2Axxr
setreg 2A58h*4,reg2Axxr
setreg 2A59h*4,reg2Axxr
setreg 2A5Ah*4,reg2Axxr
setreg 2A5Bh*4,reg2Axxr
setreg 2A5Ch*4,reg2Axxr
setreg 2A5Dh*4,reg2Axxr
setreg 2A5Eh*4,reg2Axxr
setreg 2A5Fh*4,reg2Axxr
setreg 2A60h*4,reg2Axxr
setreg 2A61h*4,reg2Axxr
setreg 2A62h*4,reg2Axxr
setreg 2A63h*4,reg2Axxr
setreg 2A64h*4,reg2Axxr
setreg 2A65h*4,reg2Axxr
setreg 2A66h*4,reg2Axxr
setreg 2A67h*4,reg2Axxr
setreg 2A68h*4,reg2Axxr
setreg 2A69h*4,reg2Axxr
setreg 2A6Ah*4,reg2Axxr
setreg 2A6Bh*4,reg2Axxr
setreg 2A6Ch*4,reg2Axxr
setreg 2A6Dh*4,reg2Axxr
setreg 2A6Eh*4,reg2Axxr
setreg 2A6Fh*4,reg2Axxr
setreg 2A70h*4,reg2Axxr
setreg 2A71h*4,reg2Axxr
setreg 2A72h*4,reg2Axxr
setreg 2A73h*4,reg2Axxr
setreg 2A74h*4,reg2Axxr
setreg 2A75h*4,reg2Axxr
setreg 2A76h*4,reg2Axxr
setreg 2A77h*4,reg2Axxr
setreg 2A78h*4,reg2Axxr
setreg 2A79h*4,reg2Axxr
setreg 2A7Ah*4,reg2Axxr
setreg 2A7Bh*4,reg2Axxr
setreg 2A7Ch*4,reg2Axxr
setreg 2A7Dh*4,reg2Axxr
setreg 2A7Eh*4,reg2Axxr
setreg 2A7Fh*4,reg2Axxr
setreg 2A80h*4,reg2Axxr
setreg 2A81h*4,reg2Axxr
setreg 2A82h*4,reg2Axxr
setreg 2A83h*4,reg2Axxr
setreg 2A84h*4,reg2Axxr
setreg 2A85h*4,reg2Axxr
setreg 2A86h*4,reg2Axxr
setreg 2A87h*4,reg2Axxr
setreg 2A88h*4,reg2Axxr
setreg 2A89h*4,reg2Axxr
setreg 2A8Ah*4,reg2Axxr
setreg 2A8Bh*4,reg2Axxr
setreg 2A8Ch*4,reg2Axxr
setreg 2A8Dh*4,reg2Axxr
setreg 2A8Eh*4,reg2Axxr
setreg 2A8Fh*4,reg2Axxr
setreg 2A90h*4,reg2Axxr
setreg 2A91h*4,reg2Axxr
setreg 2A92h*4,reg2Axxr
setreg 2A93h*4,reg2Axxr
setreg 2A94h*4,reg2Axxr
setreg 2A95h*4,reg2Axxr
setreg 2A96h*4,reg2Axxr
setreg 2A97h*4,reg2Axxr
setreg 2A98h*4,reg2Axxr
setreg 2A99h*4,reg2Axxr
setreg 2A9Ah*4,reg2Axxr
setreg 2A9Bh*4,reg2Axxr
setreg 2A9Ch*4,reg2Axxr
setreg 2A9Dh*4,reg2Axxr
setreg 2A9Eh*4,reg2Axxr
setreg 2A9Fh*4,reg2Axxr
setreg 2AA0h*4,reg2Axxr
setreg 2AA1h*4,reg2Axxr
setreg 2AA2h*4,reg2Axxr
setreg 2AA3h*4,reg2Axxr
setreg 2AA4h*4,reg2Axxr
setreg 2AA5h*4,reg2Axxr
setreg 2AA6h*4,reg2Axxr
setreg 2AA7h*4,reg2Axxr
setreg 2AA8h*4,reg2Axxr
setreg 2AA9h*4,reg2Axxr
setreg 2AAAh*4,reg2Axxr
setreg 2AABh*4,reg2Axxr
setreg 2AACh*4,reg2Axxr
setreg 2AADh*4,reg2Axxr
setreg 2AAEh*4,reg2Axxr
setreg 2AAFh*4,reg2Axxr
setreg 2AB0h*4,reg2Axxr
setreg 2AB1h*4,reg2Axxr
setreg 2AB2h*4,reg2Axxr
setreg 2AB3h*4,reg2Axxr
setreg 2AB4h*4,reg2Axxr
setreg 2AB5h*4,reg2Axxr
setreg 2AB6h*4,reg2Axxr
setreg 2AB7h*4,reg2Axxr
setreg 2AB8h*4,reg2Axxr
setreg 2AB9h*4,reg2Axxr
setreg 2ABAh*4,reg2Axxr
setreg 2ABBh*4,reg2Axxr
setreg 2ABCh*4,reg2Axxr
setreg 2ABDh*4,reg2Axxr
setreg 2ABEh*4,reg2Axxr
setreg 2ABFh*4,reg2Axxr
setreg 2AC0h*4,reg2Axxr
setreg 2AC1h*4,reg2Axxr
setreg 2AC2h*4,reg2Axxr
setreg 2AC3h*4,reg2Axxr
setreg 2AC4h*4,reg2Axxr
setreg 2AC5h*4,reg2Axxr
setreg 2AC6h*4,reg2Axxr
setreg 2AC7h*4,reg2Axxr
setreg 2AC8h*4,reg2Axxr
setreg 2AC9h*4,reg2Axxr
setreg 2ACAh*4,reg2Axxr
setreg 2ACBh*4,reg2Axxr
setreg 2ACCh*4,reg2Axxr
setreg 2ACDh*4,reg2Axxr
setreg 2ACEh*4,reg2Axxr
setreg 2ACFh*4,reg2Axxr
setreg 2AD0h*4,reg2Axxr
setreg 2AD1h*4,reg2Axxr
setreg 2AD2h*4,reg2Axxr
setreg 2AD3h*4,reg2Axxr
setreg 2AD4h*4,reg2Axxr
setreg 2AD5h*4,reg2Axxr
setreg 2AD6h*4,reg2Axxr
setreg 2AD7h*4,reg2Axxr
setreg 2AD8h*4,reg2Axxr
setreg 2AD9h*4,reg2Axxr
setreg 2ADAh*4,reg2Axxr
setreg 2ADBh*4,reg2Axxr
setreg 2ADCh*4,reg2Axxr
setreg 2ADDh*4,reg2Axxr
setreg 2ADEh*4,reg2Axxr
setreg 2ADFh*4,reg2Axxr
setreg 2AE0h*4,reg2Axxr
setreg 2AE1h*4,reg2Axxr
setreg 2AE2h*4,reg2Axxr
setreg 2AE3h*4,reg2Axxr
setreg 2AE4h*4,reg2Axxr
setreg 2AE5h*4,reg2Axxr
setreg 2AE6h*4,reg2Axxr
setreg 2AE7h*4,reg2Axxr
setreg 2AE8h*4,reg2Axxr
setreg 2AE9h*4,reg2Axxr
setreg 2AEAh*4,reg2Axxr
setreg 2AEBh*4,reg2Axxr
setreg 2AECh*4,reg2Axxr
setreg 2AEDh*4,reg2Axxr
setreg 2AEEh*4,reg2Axxr
setreg 2AEFh*4,reg2Axxr
setreg 2AF0h*4,reg2Axxr
setreg 2AF1h*4,reg2Axxr
setreg 2AF2h*4,reg2Axxr
setreg 2AF3h*4,reg2Axxr
setreg 2AF4h*4,reg2Axxr
setreg 2AF5h*4,reg2Axxr
setreg 2AF6h*4,reg2Axxr
setreg 2AF7h*4,reg2Axxr
setreg 2AF8h*4,reg2Axxr
setreg 2AF9h*4,reg2Axxr
setreg 2AFAh*4,reg2Axxr
setreg 2AFBh*4,reg2Axxr
setreg 2AFCh*4,reg2Axxr
setreg 2AFDh*4,reg2Axxr
setreg 2AFEh*4,reg2Axxr
setreg 2AFFh*4,reg2Axxr
setreg 4016h*4,reg4016r
setreg 4017h*4,reg4017r
setreg 4100h*4,reg4100r
setreg 420Ah*4,reg420Ar
setreg 420Bh*4,reg420Br
setreg 420Ch*4,reg420Cr
setreg 420Dh*4,reg420Dr
setreg 420Eh*4,reg420Er
setreg 420Fh*4,reg420Fr
setreg 4210h*4,reg4210r
setreg 4211h*4,reg4211r
setreg 4212h*4,reg4212r
setreg 4213h*4,reg4213r
setreg 4214h*4,reg4214r
setreg 4215h*4,reg4215r
setreg 4216h*4,reg4216r
setreg 4217h*4,reg4217r
setreg 4218h*4,reg4218r
setreg 4219h*4,reg4219r
setreg 421Ah*4,reg421Ar
setreg 421Bh*4,reg421Br
setreg 421Ch*4,reg421Cr
setreg 421Dh*4,reg421Dr
setreg 421Eh*4,reg421Er
setreg 421Fh*4,reg421Fr
setreg 4300h*4,reg43XXr
setreg 4301h*4,reg43XXr
setreg 4302h*4,reg43XXr
setreg 4303h*4,reg43XXr
setreg 4304h*4,reg43XXr
setreg 4305h*4,reg43XXr
setreg 4306h*4,reg43XXr
setreg 4307h*4,reg43XXr
setreg 4308h*4,reg43XXr
setreg 4309h*4,reg43XXr
setreg 430Ah*4,reg43XXr
setreg 430Bh*4,reg43XXr
setreg 430Ch*4,reg43XXr
setreg 430Dh*4,reg43XXr
setreg 430Eh*4,reg43XXr
setreg 430Fh*4,reg43XXr
setreg 4310h*4,reg43XXr
setreg 4311h*4,reg43XXr
setreg 4312h*4,reg43XXr
setreg 4313h*4,reg43XXr
setreg 4314h*4,reg43XXr
setreg 4315h*4,reg43XXr
setreg 4316h*4,reg43XXr
setreg 4317h*4,reg43XXr
setreg 4318h*4,reg43XXr
setreg 4319h*4,reg43XXr
setreg 431Ah*4,reg43XXr
setreg 431Bh*4,reg43XXr
setreg 431Ch*4,reg43XXr
setreg 431Dh*4,reg43XXr
setreg 431Eh*4,reg43XXr
setreg 431Fh*4,reg43XXr
setreg 4320h*4,reg43XXr
setreg 4321h*4,reg43XXr
setreg 4322h*4,reg43XXr
setreg 4323h*4,reg43XXr
setreg 4324h*4,reg43XXr
setreg 4325h*4,reg43XXr
setreg 4326h*4,reg43XXr
setreg 4327h*4,reg43XXr
setreg 4328h*4,reg43XXr
setreg 4329h*4,reg43XXr
setreg 432Ah*4,reg43XXr
setreg 432Bh*4,reg43XXr
setreg 432Ch*4,reg43XXr
setreg 432Dh*4,reg43XXr
setreg 432Eh*4,reg43XXr
setreg 432Fh*4,reg43XXr
setreg 4330h*4,reg43XXr
setreg 4331h*4,reg43XXr
setreg 4332h*4,reg43XXr
setreg 4333h*4,reg43XXr
setreg 4334h*4,reg43XXr
setreg 4335h*4,reg43XXr
setreg 4336h*4,reg43XXr
setreg 4337h*4,reg43XXr
setreg 4338h*4,reg43XXr
setreg 4339h*4,reg43XXr
setreg 433Ah*4,reg43XXr
setreg 433Bh*4,reg43XXr
setreg 433Ch*4,reg43XXr
setreg 433Dh*4,reg43XXr
setreg 433Eh*4,reg43XXr
setreg 433Fh*4,reg43XXr
setreg 4340h*4,reg43XXr
setreg 4341h*4,reg43XXr
setreg 4342h*4,reg43XXr
setreg 4343h*4,reg43XXr
setreg 4344h*4,reg43XXr
setreg 4345h*4,reg43XXr
setreg 4346h*4,reg43XXr
setreg 4347h*4,reg43XXr
setreg 4348h*4,reg43XXr
setreg 4349h*4,reg43XXr
setreg 434Ah*4,reg43XXr
setreg 434Bh*4,reg43XXr
setreg 434Ch*4,reg43XXr
setreg 434Dh*4,reg43XXr
setreg 434Eh*4,reg43XXr
setreg 434Fh*4,reg43XXr
setreg 4350h*4,reg43XXr
setreg 4351h*4,reg43XXr
setreg 4352h*4,reg43XXr
setreg 4353h*4,reg43XXr
setreg 4354h*4,reg43XXr
setreg 4355h*4,reg43XXr
setreg 4356h*4,reg43XXr
setreg 4357h*4,reg43XXr
setreg 4358h*4,reg43XXr
setreg 4359h*4,reg43XXr
setreg 435Ah*4,reg43XXr
setreg 435Bh*4,reg43XXr
setreg 435Ch*4,reg43XXr
setreg 435Dh*4,reg43XXr
setreg 435Eh*4,reg43XXr
setreg 435Fh*4,reg43XXr
setreg 4360h*4,reg43XXr
setreg 4361h*4,reg43XXr
setreg 4362h*4,reg43XXr
setreg 4363h*4,reg43XXr
setreg 4364h*4,reg43XXr
setreg 4365h*4,reg43XXr
setreg 4366h*4,reg43XXr
setreg 4367h*4,reg43XXr
setreg 4368h*4,reg43XXr
setreg 4369h*4,reg43XXr
setreg 436Ah*4,reg43XXr
setreg 436Bh*4,reg43XXr
setreg 436Ch*4,reg43XXr
setreg 436Dh*4,reg43XXr
setreg 436Eh*4,reg43XXr
setreg 436Fh*4,reg43XXr
setreg 4370h*4,reg43XXr
setreg 4371h*4,reg43XXr
setreg 4372h*4,reg43XXr
setreg 4373h*4,reg43XXr
setreg 4374h*4,reg43XXr
setreg 4375h*4,reg43XXr
setreg 4376h*4,reg43XXr
setreg 4377h*4,reg43XXr
setreg 4378h*4,reg43XXr
setreg 4379h*4,reg43XXr
setreg 437Ah*4,reg43XXr
setreg 437Bh*4,reg43XXr
setreg 437Ch*4,reg43XXr
setreg 437Dh*4,reg43XXr
setreg 437Eh*4,reg43XXr
setreg 437Fh*4,reg43XXr
cmp byte[SFXEnable],0
je .nosfx
call initsfxregsr
.nosfx
cmp byte[SA1Enable],0
je .nosa1
call initSA1regs
.nosa1
cmp byte[SDD1Enable],0
je .nosdd1
call initSDD1regs
.nosdd1
cmp byte[SPC7110Enable],0
je .nospc7110
call initSPC7110regs
.nospc7110
cmp byte[RTCEnable],0
je .noRTC
call RTCReset
.noRTC
ret
; global variables
SECTION .data ;ALIGN=32
NEWSYM invreg, dw 0
NEWSYM sndrot, db 0 ; rotates to use A,X or Y for sound skip
NEWSYM sndrot2, db 0 ; rotates a random value for sound skip
NEWSYM INTEnab, db 0 ; enables NMI(7)/VIRQ(5)/HIRQ(4)/JOY(0)
NEWSYM NMIEnab, db 1 ; controlled in e65816 loop. Sets to 81h
NEWSYM VIRQLoc, dw 0 ; VIRQ Y location
NEWSYM vidbright, db 0 ; screen brightness (0 .. 15)
NEWSYM previdbr, db 0 ; previous screen brightness
NEWSYM forceblnk, db 80h ; force blanking on/off ($80=on)
NEWSYM objptr, dd 0 ; pointer to object data in VRAM
NEWSYM objptrn, dd 0 ; pointer2 to object data in VRAM
NEWSYM objsize1, db 1 ; 1 = 8dot, 4=16 dot, 16=32 dot, 64=64dot
NEWSYM objsize2, db 4 ; large object size
NEWSYM objmovs1, db 2 ; number of bytes to move/paragraph
NEWSYM objadds1, dw 14 ; number of bytes to add/paragraph
NEWSYM objmovs2, db 2 ; number of bytes to move/paragraph
NEWSYM objadds2, dw 14 ; number of bytes to add/paragraph
NEWSYM oamaddrt, dw 0 ; oam address
NEWSYM oamaddrs, dw 0 ; oam address at beginning of vblank
NEWSYM objhipr, db 0 ; highest priority object #
NEWSYM bgmode, db 0 ; graphics mode ( 0 .. 7 )
NEWSYM bg3highst, db 0 ; is 1 if background 3 has the highest priority
NEWSYM bgtilesz, db 0 ; 0 = 8x8, 1 = 16x16, bit 0=bg1,bit1=bg2,etc
NEWSYM mosaicon, db 0 ; mosaic on, bit 0=bg1,bit1=bg2, etc
NEWSYM mosaicsz, db 0 ; mosaic size in pixels
NEWSYM bg1ptr, dw 0 ; pointer to background1
NEWSYM bg2ptr, dw 0 ; pointer to background2
NEWSYM bg3ptr, dw 0 ; pointer to background3
NEWSYM bg4ptr, dw 0 ; pointer to background4
NEWSYM bg1ptrb, dw 0 ; pointer to background1
NEWSYM bg2ptrb, dw 0 ; pointer to background2
NEWSYM bg3ptrb, dw 0 ; pointer to background3
NEWSYM bg4ptrb, dw 0 ; pointer to background4
NEWSYM bg1ptrc, dw 0 ; pointer to background1
NEWSYM bg2ptrc, dw 0 ; pointer to background2
NEWSYM bg3ptrc, dw 0 ; pointer to background3
NEWSYM bg4ptrc, dw 0 ; pointer to background4
NEWSYM bg1ptrd, dw 0 ; pointer to background1
NEWSYM bg2ptrd, dw 0 ; pointer to background2
NEWSYM bg3ptrd, dw 0 ; pointer to background3
NEWSYM bg4ptrd, dw 0 ; pointer to background4
NEWSYM bg1scsize, db 0 ; bg #1 screen size (0=1x1,1=1x2,2=2x1,3=2x2)
NEWSYM bg2scsize, db 0 ; bg #2 screen size (0=1x1,1=1x2,2=2x1,3=2x2)
NEWSYM bg3scsize, db 0 ; bg #3 screen size (0=1x1,1=1x2,2=2x1,3=2x2)
NEWSYM bg4scsize, db 0 ; bg #4 screen size (0=1x1,1=1x2,2=2x1,3=2x2)
NEWSYM bg1objptr, dw 0 ; pointer to tiles in background1
NEWSYM bg2objptr, dw 0 ; pointer to tiles in background2
NEWSYM bg3objptr, dw 0 ; pointer to tiles in background3
NEWSYM bg4objptr, dw 0 ; pointer to tiles in background4
NEWSYM bg1scrolx, dw 0 ; background 1 x position
NEWSYM bg2scrolx, dw 0 ; background 2 x position
NEWSYM bg3scrolx, dw 0 ; background 3 x position
NEWSYM bg4scrolx, dw 0 ; background 4 x position
NEWSYM bg1sx, dw 0 ; Temporary Variable for Debugging purposes
NEWSYM bg1scroly, dw 0 ; background 1 y position
NEWSYM bg2scroly, dw 0 ; background 2 y position
NEWSYM bg3scroly, dw 0 ; background 3 y position
NEWSYM bg4scroly, dw 0 ; background 4 y position
NEWSYM addrincr, dw 2 ; vram increment (2,64,128,256)
NEWSYM vramincr, db 0 ; 0 = inrement at 2118/2139, 1 = 2119,213A
NEWSYM vramread, db 0 ; previous character for vram read
NEWSYM vramaddr, dd 0 ; vram address
NEWSYM cgaddr, dw 0 ; cg (palette) address
NEWSYM cgmod, db 0 ; if cgram is modified or not
NEWSYM scrnon, dw 0 ; main & sub screen on
NEWSYM scrndist, db 0 ; which background is disabled
NEWSYM resolutn, dw 224 ; screen resolution
NEWSYM multa, db 0 ; multiplier A
NEWSYM diva, dw 0 ; divisor C
NEWSYM divres, dw 0 ; quotent of divc/divb
NEWSYM multres, dw 0 ; result of multa * multb/remainder of divc/divb
NEWSYM latchx, dw 0 ; latched x value
NEWSYM latchy, dw 0 ; latched y value
NEWSYM latchxr, db 0 ; low or high byte read for x value
NEWSYM latchyr, db 0 ; low or high byte read for y value
NEWSYM frskipper, db 0 ; used to control frame skipping
NEWSYM winl1, db 0 ; window 1 left position
NEWSYM winr1, db 0 ; window 1 right position
NEWSYM winl2, db 0 ; window 2 left position
NEWSYM winr2, db 0 ; window 2 right position
NEWSYM winbg1en, db 0 ; Win1 on (IN/OUT) or Win2 on (IN/OUT) on BG1
NEWSYM winbg2en, db 0 ; Win1 on (IN/OUT) or Win2 on (IN/OUT) on BG2
NEWSYM winbg3en, db 0 ; Win1 on (IN/OUT) or Win2 on (IN/OUT) on BG3
NEWSYM winbg4en, db 0 ; Win1 on (IN/OUT) or Win2 on (IN/OUT) on BG4
NEWSYM winobjen, db 0 ; Win1 on (IN/OUT) or Win2 on (IN/OUT) on sprites
NEWSYM wincolen, db 0 ; Win1 on (IN/OUT) or Win2 on (IN/OUT) on backarea
NEWSYM winlogica, db 0 ; Window logic type for BG1 to 4
NEWSYM winlogicb, db 0 ; Window logic type for Sprites and Backarea
NEWSYM winenabm, db 0 ; Window logic enable for main screen
NEWSYM winenabs, db 0 ; Window logic enable for sub screen
NEWSYM mode7set, db 0 ; mode 7 settings
NEWSYM mode7A, dw 0 ; A value for Mode 7
NEWSYM mode7B, dw 0 ; B value for Mode 7
NEWSYM mode7C, dw 0 ; C value for Mode 7
NEWSYM mode7D, dw 0 ; D value for Mode 7
NEWSYM mode7X0, dw 0 ; Center X for Mode 7
NEWSYM mode7Y0, dw 0 ; Center Y for Mode 7
NEWSYM JoyAPos, db 0 ; Old-Style Joystick Read Position for Joy 1 & 3
NEWSYM JoyBPos, db 0 ; Old-Style Joystick Read Position for Joy 2 & 4
NEWSYM compmult, dd 0 ; Complement Multiplication for Mode 7
NEWSYM joyalt, db 0 ; temporary joystick alternation
NEWSYM wramrwadr, dd 0 ; continuous read/write to wram address
NEWSYM dmadata, times 129 db 0h ; dma data (written from ports 43xx)
NEWSYM irqon, db 0 ; if IRQ has been called (80h) or not (0)
NEWSYM nexthdma, db 0 ; HDMA data to execute once vblank ends
NEWSYM curhdma, db 0 ; Currently executed hdma
NEWSYM hdmadata, times 8*19 db 0 ; 4 dword register addresses, # of bytes to
; transfer/line, address increment (word)
NEWSYM hdmatype, db 0 ; if first time executing hdma or not
NEWSYM coladdr, db 0 ; red value of color to add
NEWSYM coladdg, db 0 ; green value of color to add
NEWSYM coladdb, db 0 ; blue value of color to add
NEWSYM colnull, db 0 ; keep this 0 (when accessing colors by dword)
NEWSYM scaddset, db 0 ; screen/fixed color addition settings
NEWSYM scaddtype, db 0 ; which screen to add/sub
NEWSYM Voice0Disabl2, db 1 ; Disable Voice 0
NEWSYM Voice1Disabl2, db 1 ; Disable Voice 1
NEWSYM Voice2Disabl2, db 1 ; Disable Voice 2
NEWSYM Voice3Disabl2, db 1 ; Disable Voice 3
NEWSYM Voice4Disabl2, db 1 ; Disable Voice 4
NEWSYM Voice5Disabl2, db 1 ; Disable Voice 5
NEWSYM Voice6Disabl2, db 1 ; Disable Voice 6
NEWSYM Voice7Disabl2, db 1 ; Disable Voice 7
NEWSYM oamram, times 1024 db 0 ; OAMRAM (544 bytes)
NEWSYM cgram, times 512 db 0 ; CGRAM
NEWSYM pcgram, times 512 db 0 ; Previous CGRAM
NEWSYM vraminctype, db 0
; New variables
NEWSYM vramincby8on, db 0 ; if increment by 8 is on
NEWSYM vramincby8left, db 0 ; how many left
NEWSYM vramincby8totl, db 0 ; how many in total (32,64,128)
NEWSYM vramincby8rowl, db 0 ; how many left in that row (start at 8)
NEWSYM vramincby8ptri, dw 0 ; increment by how many when rowl = 0
NEWSYM nexthprior, db 0
NEWSYM doirqnext, db 0
NEWSYM vramincby8var, dw 0
NEWSYM screstype, db 0
NEWSYM extlatch, db 0
NEWSYM cfield, db 0
NEWSYM interlval, db 0
NEWSYM HIRQLoc, dw 0 ; HIRQ X location
NEWSYM KeyOnStA, db 0
NEWSYM KeyOnStB, db 0
NEWSYM SDD1BankA, db 0
NEWSYM SDD1BankB, db 1
NEWSYM SDD1BankC, db 2
NEWSYM SDD1BankD, db 3
NEWSYM vramread2, db 0 ; previous character for vram read
NEWSYM nosprincr, db 0
NEWSYM poamaddrs, dw 0
NEWSYM ioportval, db 0
NEWSYM tempdat, times 479 db 0 ; expandable area
num2writeppureg equ $-sndrot
; pharos equ hack *sigh*
NEWSYM PHnum2writeppureg, dd num2writeppureg
NEWSYM scrndis, db 0 ; which background is disabled
ALIGN32
NEWSYM oamaddr, dd 0 ; oam address
NEWSYM bg1ptrx, dd 0 ; pointer to background1
NEWSYM bg2ptrx, dd 0 ; pointer to background2
NEWSYM bg3ptrx, dd 0 ; pointer to background3
NEWSYM bg4ptrx, dd 0 ; pointer to background4
NEWSYM bg1ptry, dd 0 ; pointer to background1
NEWSYM bg2ptry, dd 0 ; pointer to background2
NEWSYM bg3ptry, dd 0 ; pointer to background3
NEWSYM bg4ptry, dd 0 ; pointer to background4
NEWSYM Voice0Disable, db 1 ; Disable Voice 0
NEWSYM Voice1Disable, db 1 ; Disable Voice 1
NEWSYM Voice2Disable, db 1 ; Disable Voice 2
NEWSYM Voice3Disable, db 1 ; Disable Voice 3
NEWSYM Voice4Disable, db 1 ; Disable Voice 4
NEWSYM Voice5Disable, db 1 ; Disable Voice 5
NEWSYM Voice6Disable, db 1 ; Disable Voice 6
NEWSYM Voice7Disable, db 1 ; Disable Voice 7
NEWSYM BG116x16t, db 0
NEWSYM BG216x16t, db 0
NEWSYM BG316x16t, db 0
NEWSYM BG416x16t, db 0
NEWSYM SPC700read, dd 0
NEWSYM SPC700write, dd 0
NEWSYM JoyCRead, db 0
NEWSYM nssdip1, db 0
NEWSYM nssdip2, db 0
NEWSYM nssdip3, db 0
NEWSYM nssdip4, db 0
NEWSYM nssdip5, db 0
NEWSYM nssdip6, db 0
SECTION .text
NEWSYM ClearRegs
mov word[VIRQLoc],0
mov word[bg1ptr],0
mov word[bg2ptr],0
mov word[bg3ptr],0
mov word[bg4ptr],0
mov word[bg1ptrb],0
mov word[bg2ptrb],0
mov word[bg3ptrb],0
mov word[bg4ptrb],0
mov word[bg1ptrc],0
mov word[bg2ptrc],0
mov word[bg3ptrc],0
mov word[bg4ptrc],0
mov word[bg1ptrd],0
mov word[bg2ptrd],0
mov word[bg3ptrd],0
mov word[bg4ptrd],0
mov word[bg1objptr],0
mov word[bg2objptr],0
mov word[bg3objptr],0
mov word[bg4objptr],0
ret
reg2100r:
mov al,[vidbright]
or al,[forceblnk]
ret
; Multiply Result Low
reg2134r:
checkmultchange
mov al,[compmult]
ret
; Multiply Result Middle
reg2135r:
checkmultchange
mov al,[compmult+1]
ret
; Multiply Result High
reg2136r:
checkmultchange
mov al,[compmult+2]
ret
; Software latch for horizontal/vertical counter
reg2137r:
; mov byte[debstop3],1
cmp byte[debuggeron],1
je .debugger
cmp byte[iocounteren],1
je .dolatch
test byte[ioportval],80h
jnz .nolatch
.dolatch
xor ebx,ebx
mov bl,[cycpl]
sub bl,dh
add bx,bx
mov [latchx],bx
mov bx,[curypos]
mov [latchy],bx
mov bl,[INTEnab]
and bl,30h
cmp bl,30h
jne .novhirq
cmp word[HIRQLoc],0F0h
ja .incry
cmp dh,20
jae .noincly
.incry
inc word[latchy]
.novhirq
.noincly
.nolatch
xor al,al
mov byte[extlatch],0
ret
.debugger
debblah:
test byte[ioportval],80h
jnz .nolatch2
xor ebx,ebx
mov bl,[cycpl]
sub bl,[pdh]
add bx,bx
mov [latchx],bx
mov bx,[curypos]
mov [latchy],bx
mov bl,[INTEnab]
and bl,30h
cmp bl,30h
jne .novhirq
cmp word[HIRQLoc],0F0h
; ja .incry
cmp word[latchx],80
; jb .noincly
.incry
inc word[latchy]
.novhirq
.noincly
xor al,al
mov byte[extlatch],0
ret
push eax
push edx
xor eax,eax
xor ebx,ebx
mov al,[cycpl]
sub al,[pdh]
mov bx,339
mul bx
xor ebx,ebx
mov bl,[cycpl]
div bx
mov [latchx],ax
pop edx
pop eax
mov bx,[curypos]
mov [latchy],bx
mov bl,[INTEnab]
and bl,30h
cmp bl,30h
jne .novhirq2
cmp word[HIRQLoc],0F0h
ja .incry2
cmp word[latchx],80
jb .noincly2
.incry2
inc word[latchy]
.novhirq2
.noincly2
.nolatch2
xor al,al
mov byte[extlatch],0
ret
; Read OAM Data (Low, High)
reg2138r:
xor ebx,ebx
mov bx,word[oamaddr]
add ebx,oamram
mov al,[ebx]
inc word[oamaddr]
cmp word[oamaddr],543
ja .wrapoam
ret
.wrapoam
mov word[oamaddr],0
ret
; Read VRAM Data (Low)
reg2139r:
mov al,[vramread]
xor ebx,ebx
mov bx,[vramaddr]
add ebx,[vram]
mov bl,[ebx]
mov [vramread],bl
cmp byte[vramincr],0
je near .noincr
mov bx,[addrincr]
add [vramaddr],bx
cmp byte[vramincby8on],1
jne .noincr
dec byte[vramincby8left]
jnz .noincr
add word[vramaddr],2
mov bl,byte[vramincby8totl]
mov byte[vramincby8left],bl
dec byte[vramincby8rowl]
jz .nextrow
mov bx,[vramincby8ptri]
sub [vramaddr],bx
jmp .noincr
.nextrow
mov byte[vramincby8rowl],8
sub word[vramaddr],16
.noincr
ret
; Read VRAM Data (High)
reg213Ar:
mov al,[vramread2]
xor ebx,ebx
mov bx,[vramaddr]
add ebx,[vram]
mov bl,[ebx+1]
mov [vramread2],bl
cmp byte[vramincr],1
je near .noincr
mov bx,[addrincr]
add [vramaddr],bx
cmp byte[vramincby8on],1
jne .noincr
dec byte[vramincby8left]
jnz .noincr
add word[vramaddr],2
mov bl,byte[vramincby8totl]
mov byte[vramincby8left],bl
dec byte[vramincby8rowl]
jz .nextrow
mov bx,[vramincby8ptri]
sub [vramaddr],bx
jmp .noincr
.nextrow
mov byte[vramincby8rowl],8
sub word[vramaddr],16
.noincr
ret
; Read CGRAM Data
reg213Br:
xor ebx,ebx
mov bx,[cgaddr]
mov al,[cgram+ebx]
inc word[cgaddr]
and word[cgaddr],01FFh
ret
; H counter data by external or software latch
reg213Cr:
cmp byte[latchxr],1
je .highv
mov al,byte[latchx]
mov byte[latchxr],1
ret
.highv
mov al,byte[latchx]
and al,0FEh
or al,byte[latchx+1]
mov byte[latchxr],0
ret
; V counter data by external or software latch
reg213Dr:
cmp byte[latchyr],2 ; hack for games that don't read 213F
je .noreset
cmp byte[latchyr],1
je .highv
mov al,byte[latchy]
mov byte[latchyr],1
ret
.highv
mov al,byte[latchy]
and al,0FEh
or al,byte[latchy+1]
mov byte[latchyr],0
ret
.noreset
mov al,byte[latchy]
and al,0FEh
or al,byte[latchy+1]
ret
; PPU Status Flag & Version number (OBJ over flags)
reg213Er:
mov al,01h
ret
; PPU Status Flag & Version number (NTSC/PAL/EXTRN Latch flag)
reg213Fr:
; mov byte[debstop3],1
mov al,[romispal]
shl al,4
or al,[cfield]
mov byte[latchxr],0
mov byte[latchyr],0
or al,[extlatch]
ret
; Sound Reg #1
reg2140r:
cmp byte[spcon],0
je .nosound
inc dword[SPC700read]
mov al,[reg1read]
mov dword[spcnumread],0
; mov dword[spchalted],-1
ret
.nosound
; Find for D0
mov ebx,esi
cmp word[ebx],0FB10h
jne .noret
mov word[ebx],0EAEAh
.noret
mov al,5
.tryagain
cmp byte[ebx],0D0h
je .foundit
inc ebx
dec al
jnz .tryagain
jmp .notfound
.foundit
mov byte[ebx],0EAh
mov byte[ebx+1],0EAh
.notfound
inc byte[sndrot2]
cmp byte[sndrot2],3
jne .a
mov byte[sndrot2],0
.a
xor al,al
test byte[sndrot2],01h
jz .n
mov al,[xa]
.n
ret
; Sound Reg #2
reg2141r:
cmp byte[spcon],0
je .nosound
inc dword[SPC700read]
mov al,[reg2read]
mov dword[spcnumread],0
; mov dword[spchalted],-1
ret
.nosound
; Find for D0
mov ebx,esi
mov al,3
.tryagain
cmp byte[ebx],0D0h
je .foundit
inc ebx
dec al
jnz .tryagain
jmp .notfound
.foundit
mov byte[ebx],0EAh
mov byte[ebx+1],0EAh
.notfound
xor byte[sndrot],01h
mov al,[xa+1]
test byte[sndrot],01h
jz .n
mov al,[xa]
.n
ret
; Sound Reg #3
reg2142r:
cmp byte[spcon],0
je .nosound
inc dword[SPC700read]
mov al,[reg3read]
mov dword[spcnumread],0
; mov dword[spchalted],-1
ret
.nosound
; Find for D0
mov ebx,esi
mov al,3
.tryagain
cmp byte[ebx],0D0h
je .foundit
inc ebx
dec al
jnz .tryagain
jmp .notfound
.foundit
mov byte[ebx],0EAh
mov byte[ebx+1],0EAh
.notfound
mov al,[xa]
test byte[sndrot],01h
jz .n
mov al,[xa+1]
.n
ret
; Sound Reg #4
reg2143r:
cmp byte[spcon],0
je .nosound
inc dword[SPC700read]
mov al,[reg4read]
mov dword[spcnumread],0
; mov dword[spchalted],-1
ret
.nosound
; Find for D0
mov ebx,esi
mov al,3
.tryagain
cmp byte[ebx],0D0h
je .foundit
inc ebx
dec al
jnz .tryagain
jmp .notfound
.foundit
mov byte[ebx],0EAh
mov byte[ebx+1],0EAh
.notfound
mov al,[xa+1]
ret
reg2144r:
xor al,al
ret
; WRAM Read
reg2180r:
mov ebx,[wramrwadr]
add ebx,[wramdata]
mov al,[ebx]
inc dword[wramrwadr]
and dword[wramrwadr],01FFFFh
ret
reg2Axxr:
xor al,al
ret
; Joystick Data for controller 1 and 2
reg4016r:
xor al,al
test dword[JoyANow],80000000h
jz .noal
mov al,1
.noal
rol dword[JoyANow],1
ret
SECTION .bss ;ALIGN=32
NEWSYM MultiTap, resb 1
SECTION .text
; Joystick Data for controller 2 and 4
reg4017r:
cmp byte[snesmouse],0
jne .nomultitap
cmp byte[MultiTap],1
je .multitap
.nomultitap
xor al,al
test dword[JoyBNow],80000000h
jz .noal
mov al,1
.noal
rol dword[JoyBNow],1
ret
.multitap
test byte[MultiTapStat],1
jz .no1
mov al,0FFh
ret
.no1
test byte[MultiTapStat],80h
jz .contr45
xor al,al
test dword[JoyBNow],80000000h
jz .nojb
or al,01h
.nojb
test dword[JoyCNow],80000000h
jz .nojc
or al,02h
.nojc
rol dword[JoyBNow],1
rol dword[JoyCNow],1
ret
.contr45
xor al,al
test dword[JoyDNow],80000000h
jz .nojd
or al,1
.nojd
test dword[JoyENow],80000000h
jz .noje
or al,02h
.noje
rol dword[JoyDNow],1
rol dword[JoyENow],1
ret
reg4100r:
xor al,al
cmp byte[nssdip1],1
jne .nodip1
mov al,1
.nodip1
cmp byte[nssdip2],1
jne .nodip2
or al,02h
.nodip2
cmp byte[nssdip3],1
jne .nodip3
or al,04h
.nodip3
cmp byte[nssdip4],1
jne .nodip4
or al,08h
.nodip4
cmp byte[nssdip5],1
jne .nodip5
or al,10h
.nodip5
cmp byte[nssdip6],1
jne .nodip6
or al,20h
.nodip6
ret
reg420Ar:
reg420Br:
reg420Cr:
reg420Dr:
reg420Er:
reg420Fr:
xor al,al
ret
; NMI Check Register
reg4210r:
mov al,[NMIEnab]
cmp byte[curnmi],0
jne .nmi
mov byte[NMIEnab],01h
.nmi
mov byte[curnmi],0
ret
; Video IRQ Register
reg4211r:
mov al,[irqon]
mov byte[irqon],0
cmp dh,[cycphb]
jae .nohblank
or al,40h
.nohblank
ret
SECTION .bss
NEWSYM hblank, resb 1
SECTION .text
; H/V Blank Flag & Joystick Controller Enable Flag
; bit 7 = vblank, 0=out,1=in, bit 6 = hblank, 0=out,1=in, bit 0 = joystick on
reg4212r:
xor al,al
cmp byte[joycontren],25
jb .nojoyc
.yesjoy
mov al,1
.nojoyc
inc byte[joycontren]
cmp byte[joycontren],50
jne .n
mov byte[joycontren],0
.n
cmp byte[debuggeron],1
je .debugger
mov bx,[resolutn]
cmp word[curypos],bx
jne .notres
cmp byte[nmistatus],2
je .vblank
.notres
inc bx
cmp word[curypos],bx
jb .novbl
mov bx,[totlines]
dec bx
cmp word[curypos],bx
jae .novbl
.vblank
or al,80h
; jmp .nohblank
.novbl
mov byte[hblank],0
cmp dh,[cycphb]
jae .nohblank
mov byte[hblank],1
or al,40h
.nohblank
test byte[INTEnab],01h
jz .nojoy
mov bx,[resolutn]
add bx,2
cmp word[curypos],bx
jne .nojoy
cmp dh,5
ja .nojoy
ret
.nojoy
ret
.debugger
debblah2:
push edx
mov dh,[pdh]
mov bx,[resolutn]
cmp word[curypos],bx
jne .notres
cmp byte[nmistatus],2
je .vblank
.notres
inc bx
cmp word[curypos],bx
jb .novbl
mov bx,[totlines]
dec bx
cmp word[curypos],bx
jae .novbl
.vblank
or al,80h
; jmp .nohblank
.novbl
cmp dh,[cycphb]
jae .nohblank
or al,40h
.nohblank
test byte[INTEnab],01h
jz .nojoy
mov bx,[resolutn]
add bx,2
cmp word[curypos],bx
jne .nojoy
cmp dh,5
ja .nojoy
pop edx
ret
.nojoy
pop edx
ret
mov bx,[resolutn]
inc bx
cmp word[curypos],bx
jb .novbl2
or al,80h
jmp .nohblank2
.novbl2
mov bl,[pdh]
cmp bl,[cycphb]
jae .nohblank2
or al,40h
.nohblank2
test byte[INTEnab],01h
jz .nojoy2
mov bx,[resolutn]
add bx,2
cmp word[curypos],bx
jne .nojoy2
cmp byte[pdh],5
ja .nojoy
; or al,01h
ret
.nojoy2
ret
; Programmable I/O port
reg4213r:
mov al,[ioportval]
ret
; Quotent of Divide Result (Low)
reg4214r:
mov al,[divres]
ret
; Quotent of Divide Result (High)
reg4215r:
mov al,[divres+1]
ret
; Product of Multiplication Result or Remainder of Divide Result (Low)
reg4216r:
mov al,[multres]
ret
; Product of Multiplication Result or Remainder of Divide Result (High)
reg4217r:
mov al,[multres+1]
ret
; Joystick 1 Low
; bit7=X,bit6=Y,bit5=L,bit4=R
reg4218r:
mov al,[JoyAOrig+2]
ret
; Joystick 1 High
; bit7=A,bit6=B,bit5=Sel,bit4=Start,bit3=up,bit2=down,bit1=left,bit0=right
reg4219r:
mov al,[JoyAOrig+3]
ret
; Joystick 2 Low
reg421Ar:
mov al,[JoyBOrig+2]
ret
; Joystick 2 High
reg421Br:
mov al,[JoyBOrig+3]
ret
; Joystick 3 Low
reg421Cr:
mov al,[JoyDOrig+2]
ret
; Joystick 3 High
reg421Dr:
mov al,[JoyDOrig+3]
ret
; Joystick 4 Low
reg421Er:
mov al,[JoyCOrig+2]
ret
; Joystick 4 High
reg421Fr:
mov al,[JoyCOrig+3]
ret
; DMA Reader
reg43XXr:
xor ebx,ebx
mov bx,cx
sub bx,4300h
mov al,[dmadata+ebx]
ret
regINVALID: ; Invalid Register
cmp cx,2100h
jb .cleared
mov al,ch
cmp byte[SPC7110Enable],0
je .nospc7110
.cleared
xor al,al
.nospc7110
; mov byte[debstop3],1
ret
mov al,[previdmode]
mov ah,0
int 10h
mov byte[invalid],1
mov [invreg],cx
mov ah,9
mov edx,.invalidreg
int 21h
xor eax,eax
mov ax,[invreg]
call printhex
mov ah,2
mov dl,13
int 21h
mov ah,2
mov dl,10
int 21h
mov eax,[numinst] ;Temporary
call printnum
jmp DosExit
SECTION .data ;ALIGN=32
.invalidreg db 'Invalid Read Register : $'
SECTION .text
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