How to add a newer SEGA screen to Sonic 1

OscillateNumInit · Dec 22, 2008

Note: You must be using the ASM68K assembler to properly add the screen

In sonic1.asm add the following equates and macros to the beginning of the file:

Code:

BitMapXpos	equ	4

BitMapYpos	equ	2

BitMapWidth	equ	256

BitMapHeight	equ	128

BitMapCellHeight	equ	&#40;BitMapHeight/8&#41;

BitMapCellWidth	equ	&#40;BitMapWidth/8&#41;

WallPalBits	equ	$2000

MapRowWidth	equ	64

bitmapaddr	equ $8000

scrollAaddr	equ	$C000

spriteaddr	equ	$D800

hscrolladdr	equ	$DC00

scrollBaddr	equ	$E000

windowaddr	equ	$F000

DMA_ByteInc	equ	$0

DMA_Length1	equ	$2

DMA_Length2	equ	$4

DMA_SrcAdr1	equ	$6

DMA_SrcAdr2	equ	$8

DMA_SrcAdr3	equ	$A

DMA_DMAenbl	equ	$C

DMA_DstAdr1	equ	$E

DMA_DstAdr2	equ	$10

DMA_DMADisbl	equ	$12

SNDADD		  EQU	 $A04000

SNDDAT		  EQU	 $A04001

CNTLA		   EQU	 $A10008

CNTLB		   EQU	 $A1000A

CNTLC		   EQU	 $A1000C

CNTLAW		  EQU	 $A10009

CNTLBW		  EQU	 $A1000B

CNTLCW		  EQU	 $A10009

PPCNTL		  EQU	 $A1000D

PPDATA		  EQU	 $A10007

BUSREQ		  EQU	 $A11100

BUSRES		  EQU	 $A11200

Z80RAM		  EQU	 $A00000

VDATA		   EQU	 $C00000

VCTRL		   EQU	 $C00004

SetVdpRegister  MACRO

		MOVE.W  #$8000|&#40;\1<<8&#41;|\2,VCTRL; check out the SEGA manual

		ENDM

SetVdpRegisterCode	  MACRO

		and.w   #$00ff,\2			 &#59; Mask off high part

		or.w	#$8000|&#40;\1<<8&#41;,\2

		move.w  \2,VCTRL

		ENDM

AutoIncrement   MACRO

		SetVdpRegister  15,\1

		ENDM

VramWrtAddr  MACRO

		MOVE.L  #$40000000|&#40;&#40;\1&$3fff&#41;<<16&#41;|&#40;&#40;\1>>14&#41;&3&#41;,\2

		ENDM

VSramWrtAddr  MACRO

		MOVE.L  #$40000010|&#40;&#40;\1&$3fff&#41;<<16&#41;|&#40;&#40;\1>>14&#41;&3&#41;,\2

		ENDM

CramWrtAddr  MACRO

		MOVE.L  #$C0000000|&#40;&#40;\1&$3fff&#41;<<16&#41;|&#40;&#40;\1>>14&#41;&3&#41;,\2

		ENDM

CalcVramWrtAddrCode MACRO

		move.w  \1,\2		 &#59; Copy for lower 14 bits

		and.l   #$3fff,\2	 &#59; mask

		lsl.l   #8,\2

		lsl.l   #8,\2		 &#59; Shift up

		or.l	#$40000000,\2 &#59; Set bit that tells VDP it&#39;s a VRAM WRITE

		lsr.l   #8,\1

		lsr.l   #6,\1		 &#59; Shift down 14 bits

		and.l   #$3,\1

		or.l	\1,\2		 &#59; and combine

		ENDM

At the end of the file add

Code:

SegaLogo

	move.l  #10,d6

	bsr	delay

	SetVdpRegister  1,$44

	SetVdpRegister  16,1 

	lea.l   LogoChars,A0 

	VramWrtAddr  $20,VCTRL

	move.l  #16*147,d0

ldchar&#58;

	move.w  &#40;a0&#41;+,VDATA

	dbra	d0,ldchar

	lea.l   LogoPalette,a0

	CramWrtAddr  $0,VCTRL

	moveq.l #15,d0

ldpal&#58;

	move.w  &#40;a0&#41;+,VDATA

	dbra	d0,ldpal

	VramWrtAddr $C51C,D2

	moveq.l	#1,d1

	moveq.l #3,d3

newrow&#58;

	move.l	d2,VCTRL

	add.l   #$00800000,D2

	moveq.l #11,D0

wrtrow1&#58;

	move.w	d1,VDATA

	addq.w	#1,d1

	dbra	d0,wrtrow1

	dbra	d3,newrow

	lea.l   LogoCycle,a0

	add.l	#32,a0

	moveq   #16,d1

	move.l  #$3f,d6

	jsr	delay

stcycl&#58;

	move.l	a0,a1

	move.l  #$c00e0000,$C00004.L

	moveq   #8,d0

cyc&#58;

	move.w  &#40;a1&#41;+,VDATA

	dbra	d0,cyc

	move.l  #$08,d6

	bsr	 delay

	subq	#2,a0

	dbra	d1,stcycl

	move.l  #$40,d6

	bsr	 delay

	CramWrtAddr  $0,VCTRL

	moveq.l #15,d0

.clpal&#58;

	move.w  #0,VDATA

	dbra	d0,.clpal

	VramWrtAddr $C000,VCTRL

	move.l #64*28,d0

.clmap&#58;

	move.w  #0,VDATA

	dbra	d0,.clmap

	rts

delay&#58;

	move.l  #$fff,d7

dt&#58;	nop

	dbra	d7,dt

	dbra	d6,delay

	rts

LogoChars&#58;

				dc.l	$00000000,$00000111,$00011BBC,$001ABBBB

				dc.l	$01AABBBB,$01AAABBB,$1AAAABB1,$19AAAA1B

				dc.l	$00000000,$11111111,$CCCDDDDE,$CCCCDDDD

				dc.l	$CCCCDDDD,$BCCCCDDD,$11111111,$BBCCCCDD

				dc.l	$00000000,$11111100,$EEEFF100,$EEEEF101

				dc.l	$EEEEF11A,$DEEEE11A,$111111AA,$DDEEE1AA

				dc.l	$00000000,$00111111,$11BBCCCC,$BBBBCCCC

				dc.l	$ABBBBCCC,$ABBBBCCC,$AABBB111,$AABB1BCC

				dc.l	$00000000,$11111111,$DDDDEEEE,$DDDDEEEE

				dc.l	$CDDDDEEE,$CDDDDEEE,$11111111,$CCDDDDEE

				dc.l	$00000000,$11110000,$FFF10011,$FFF101BB

				dc.l	$EFF11ABB,$EFF11ABB,$1111AAAB,$EEF1AAAB

				dc.l	$00000000,$11111111,$BCCCCDDD,$BCCCCDDD

				dc.l	$BBCCCCDD,$BBCCCCDD,$BBB11111,$B11CCCCD

				dc.l	$00000000,$11111111,$DEEEEFFF,$DEEEEFFF

				dc.l	$DDEEEEFF,$DDEEEEFF,$11111111,$DDDEEEEF

				dc.l	$00000000,$11000000,$F1000000,$F1000000

				dc.l	$F1000000,$F1000000,$11000000,$F1000001

				dc.l	$00000000,$00000111,$00011DDD,$001CCDDD

				dc.l	$01CCCDDD,$1BCCCCDD,$1BCCCCDD,$BBBCCC11

				dc.l	$00001111,$10000010,$E1100010,$DEE10010

				dc.l	$DEEE1010,$DDEEE100,$DDEEE100,$DDDEEE10

				dc.l	$10100001,$00110011,$00101101,$00100001

				dc.l	$00100001,$00000000,$00000000,$00000000

				dc.l	$19AAA1BB,$199AA1AB,$199AA1AB,$1999A1AA

				dc.l	$1999A1AA,$199991AA,$199991AA,$1899991A

				dc.l	$BBCCCCDD,$BBBCCCCD,$BBBCCCCD,$BB111111

				dc.l	$BBBBCCCC,$ABBBBCCC,$ABBBBCCC,$AABBBBCC

				dc.l	$DDEEE19A,$DDDEE19A,$DDDEE199,$11111199

				dc.l	$11111199,$CD111199,$CDD11199,$CCDD1199

				dc.l	$AAA1BBBC,$AAA1BBBC,$AAA1BBBB,$AAA1BBB1

				dc.l	$9AA1ABBB,$9AA1ABBB,$99A1AABB,$99A1AABB

				dc.l	$CCCDDDDE,$CCCDDDDE,$CCCCDDDD,$11111111

				dc.l	$BCCCCDDD,$BCCCCDDD,$BBCCCCDD,$BBCCCCDD

				dc.l	$EEE1AAAA,$EEE19AAA,$EEE19AAA,$111199AA

				dc.l	$D11199AA,$D111999A,$D111999A,$D1119999

				dc.l	$1BBBCCCC,$1BBBBCCC,$1BBBBCCC,$1ABBB111

				dc.l	$1ABBB1CC,$1AABB1BC,$1AABB1BC,$1AAAB1BB

				dc.l	$DDDDEEEE,$CDDDEEEE,$CDDDDEEE,$11111111

				dc.l	$CCDDDDEE,$CCCDDDEE,$CCCDDDDE,$CCCCDDDE

				dc.l	$F1000001,$F1000001,$E100001A,$1100001A

				dc.l	$E100001A,$E10001AA,$E10001AA,$E100019A

				dc.l	$BBBCCC11,$BBBBC1CC,$BBBBC1CC,$ABBBB1CC

				dc.l	$ABBB1CCC,$AABB1BCC,$AABB1BCC,$AAA1BBBC

				dc.l	$DDDEEE10,$1DDDEE10,$1DDDEEE1,$1DDDDEE1

				dc.l	$C1DDDEE1,$C1DDDDEE,$C1DDDDEE,$CC1DDDDE

				dc.l	$00000000,$00000000,$00000000,$00000000

				dc.l	$00000000,$10000000,$10000000,$10000000

				dc.l	$019999A1,$0189999A,$0019999A,$00189999

				dc.l	$00011199,$11111111,$18888999,$18888899

				dc.l	$1111111C,$AAABBBB1,$AAABBBBC,$AAAABBBB

				dc.l	$AAAABBBB,$1111ABBB,$9AAAABBB,$99AAAABB

				dc.l	$CCDD1189,$CCCDD189,$1CCDD188,$1CCCD188

				dc.l	$1CCCD188,$1CCCC188,$1CCCC188,$1BCCC188

				dc.l	$99911111,$9991AAAB,$9991AAAA,$9991AAAA

				dc.l	$89919AAA,$89919AA1,$889199AA,$889199AA

				dc.l	$11111111,$BBBCCCCD,$BBBBCCCC,$BBBBCCCC

				dc.l	$ABBBBCCC,$11111111,$AABBBBCC,$AABBBBCC

				dc.l	$11119999,$D1118999,$D1118999,$D1118899

				dc.l	$C1118899,$11118889,$CCD18889,$CCD18888

				dc.l	$1AAAB111,$1AAAA1BB,$1AAAA1BB,$19AAA1BB

				dc.l	$19AAA1BB,$199AA111,$199AAAAB,$1999AAAA

				dc.l	$11111DDD,$BCCC1DDD,$BCCC1DDD,$BBCC1CDD

				dc.l	$BBCC1CDD,$BBBC1CCD,$BBBC1CCD,$BBBB1CCC

				dc.l	$E100199A,$E1001999,$D1001999,$D1018999

				dc.l	$D1018999,$D1018899,$D1188899,$D1188889

				dc.l	$AAA1BBBC,$AAA1BBBB,$AA1ABBBB,$9A1AABBB

				dc.l	$9A1AAB11,$91AAAA11,$91AAAABB,$919AAAAB

				dc.l	$CC1DDDDE,$CC1CDDDD,$CCC1DDDD,$BCC1CDDD

				dc.l	$BCC1CDDD,$BBCC1CDD,$BBCC1CDD,$BBBC1CCD

				dc.l	$E1000000,$E1000000,$E1000000,$DE100000

				dc.l	$DE100000,$DD100000,$DDE10000,$DDD10000

				dc.l	$17888899,$17788889,$11111111,$17778888

				dc.l	$17778888,$17777888,$17777888,$11111111

				dc.l	$99AAAABB,$999AAAA1,$1111111B,$9999AAAA

				dc.l	$9999AAAA,$89999AAA,$89999AAA,$11111111

				dc.l	$1BCCC178,$BBBCC178,$BBBCC177,$BBBB1017

				dc.l	$BBBB1017,$ABB10001,$A1100000,$10000000

				dc.l	$8881999A,$8889199A,$88889111,$88889999

				dc.l	$78888999,$78888999,$11888899,$00111111

				dc.l	$AAABBBBC,$AAABBBBC,$11111111,$AAAABBBB

				dc.l	$9AAAABBB,$9AAAABBB,$99AAAABB,$11111111

				dc.l	$CCC17888,$CCC17888,$11111788,$CCC11788

				dc.l	$BCC11778,$BCC10178,$BBC10011,$11110000

				dc.l	$1999AAAA,$81199AAA,$88911111,$889999AA

				dc.l	$8889999A,$8889999A,$88889999,$11111111

				dc.l	$BBBB1CCC,$ABBB1CCC,$11111BCC,$AABBBBCC

				dc.l	$AAABBBBC,$AAABBBBC,$AAAABBBB,$11111111

				dc.l	$D1788889,$C1778888,$CC778888,$CC777881

				dc.l	$CC777881,$CC777781,$CC777781,$11111111

				dc.l	$199AAAAB,$1999AAAA,$19991111,$89991AAA

				dc.l	$89911AAA,$889119AA,$881119AA,$11111111

				dc.l	$BBBCC1CD,$BBBBC1CC,$111111CC,$ABBBBCCC

				dc.l	$ABBBBCCC,$AABBBBCC,$AABBBBCC,$11111111

				dc.l	$DDD10000,$DDDD1000,$DDDD1000,$CDDD1000

				dc.l	$CDDDD100,$CCDDD100,$CCDDD100,$11111100

	DC.L	$00000000,$00000000,$00000000,$00000000

	DC.L	$00000000,$00000000,$00000000,$00000000

	DC.L	$00110000,$00110000,$00110000,$00110000

	DC.L	$00110000,$00000000,$00110000,$00000000

	DC.L	$01101100,$01101100,$01101100,$00000000

	DC.L	$00000000,$00000000,$00000000,$00000000

	DC.L	$01101100,$01101100,$11111110,$01101100

	DC.L	$11111110,$01101100,$01101100,$00000000

	DC.L	$00110000,$01111100,$11000000,$01111000

	DC.L	$00001100,$11111000,$00110000,$00000000

	DC.L	$00000000,$11000110,$11001100,$00011000

	DC.L	$00110000,$01100110,$11000110,$00000000

	DC.L	$00111000,$01101100,$00111000,$01110110

	DC.L	$11011100,$11001100,$01110110,$00000000

	DC.L	$01100000,$01100000,$11000000,$00000000

	DC.L	$00000000,$00000000,$00000000,$00000000

	DC.L	$00011000,$00110000,$01100000,$01100000

	DC.L	$01100000,$00110000,$00011000,$00000000

	DC.L	$01100000,$00110000,$00011000,$00011000

	DC.L	$00011000,$00110000,$01100000,$00000000

	DC.L	$00000000,$01100110,$00111100,$11111111

	DC.L	$00111100,$01100110,$00000000,$00000000

	DC.L	$00000000,$00110000,$00110000,$11111100

	DC.L	$00110000,$00110000,$00000000,$00000000

	DC.L	$00000000,$00000000,$00000000,$00000000

	DC.L	$00000000,$00110000,$00110000,$01100000

	DC.L	$00000000,$00000000,$00000000,$11111100

	DC.L	$00000000,$00000000,$00000000,$00000000

	DC.L	$00000000,$00000000,$00000000,$00000000

	DC.L	$00000000,$00110000,$00110000,$00000000

	DC.L	$00000110,$00001100,$00011000,$00110000

	DC.L	$01100000,$11000000,$10000000,$00000000

	DC.L	$01111100,$11000110,$11001110,$11011110

	DC.L	$11110110,$11100110,$01111100,$00000000

	DC.L	$00110000,$01110000,$00110000,$00110000

	DC.L	$00110000,$00110000,$01111000,$00000000

	DC.L	$11111000,$00001100,$00001100,$00111000

	DC.L	$01100000,$11000000,$11111100,$00000000

	DC.L	$11111000,$00001100,$00001100,$00111000

	DC.L	$00001100,$00001100,$11111000,$00000000

	DC.L	$00011100,$00111100,$01101100,$11001100

	DC.L	$11111110,$00001100,$00001100,$00000000

	DC.L	$11111100,$11000000,$11111000,$00001100

	DC.L	$00001100,$00001100,$11111000,$00000000

	DC.L	$00111100,$01100000,$11000000,$11111000

	DC.L	$11001100,$11001100,$01111000,$00000000

	DC.L	$11111100,$00001100,$00011000,$00110000

	DC.L	$01100000,$11000000,$11000000,$00000000

	DC.L	$01111000,$11001100,$11001100,$01111000

	DC.L	$11001100,$11001100,$01111000,$00000000

	DC.L	$01111000,$11001100,$11001100,$01111100

	DC.L	$00001100,$00001100,$01111000,$00000000

	DC.L	$00000000,$00110000,$00110000,$00000000

	DC.L	$00000000,$00110000,$00110000,$00000000

	DC.L	$00000000,$00110000,$00110000,$00000000

	DC.L	$00000000,$00110000,$00110000,$01100000

	DC.L	$00011000,$00110000,$01100000,$11000000

	DC.L	$01100000,$00110000,$00011000,$00000000

	DC.L	$00000000,$00000000,$11111100,$00000000

	DC.L	$00000000,$11111100,$00000000,$00000000

	DC.L	$01100000,$00110000,$00011000,$00001100

	DC.L	$00011000,$00110000,$01100000,$00000000

	DC.L	$11111000,$00001100,$00001100,$00111000

	DC.L	$00110000,$00000000,$00110000,$00000000

	DC.L	$01111100,$11000110,$11011110,$11011110

	DC.L	$11011110,$11000000,$01111000,$00000000

	DC.L	$00110000,$01111000,$11001100,$11001100

	DC.L	$11111100,$11001100,$11001100,$00000000

	DC.L	$11111000,$11001100,$11001100,$11111000

	DC.L	$11001100,$11001100,$11111000,$00000000

	DC.L	$01111100,$11000000,$11000000,$11000000

	DC.L	$11000000,$11000000,$01111100,$00000000

	DC.L	$11111000,$11001100,$11001100,$11001100

	DC.L	$11001100,$11001100,$11111000,$00000000

	DC.L	$11111100,$11000000,$11000000,$11111000

	DC.L	$11000000,$11000000,$11111100,$00000000

	DC.L	$11111100,$11000000,$11000000,$11111000

	DC.L	$11000000,$11000000,$11000000,$00000000

	DC.L	$01111100,$11000000,$11000000,$11000000

	DC.L	$11011100,$11001100,$01111100,$00000000

	DC.L	$11001100,$11001100,$11001100,$11111100

	DC.L	$11001100,$11001100,$11001100,$00000000

	DC.L	$01111000,$00110000,$00110000,$00110000

	DC.L	$00110000,$00110000,$01111000,$00000000

	DC.L	$00011110,$00001100,$00001100,$00001100

	DC.L	$00001100,$00001100,$11111000,$00000000

	DC.L	$11000110,$11001100,$11011000,$11110000

	DC.L	$11011000,$11001100,$11000110,$00000000

	DC.L	$11000000,$11000000,$11000000,$11000000

	DC.L	$11000000,$11000000,$11111100,$00000000

	DC.L	$11000110,$11101110,$11111110,$11010110

	DC.L	$11000110,$11000110,$11000110,$00000000

	DC.L	$11000110,$11100110,$11110110,$11011110

	DC.L	$11001110,$11000110,$11000110,$00000000

	DC.L	$01111000,$11001100,$11001100,$11001100

	DC.L	$11001100,$11001100,$01111000,$00000000

	DC.L	$11111000,$11001100,$11001100,$11111000

	DC.L	$11000000,$11000000,$11000000,$00000000

	DC.L	$01111000,$11001100,$11001100,$11001100

	DC.L	$11001100,$11011000,$01101100,$00000000

	DC.L	$11111000,$11001100,$11001100,$11111000

	DC.L	$11110000,$11011000,$11001100,$00000000

	DC.L	$01111100,$11000000,$11000000,$01111000

	DC.L	$00001100,$00001100,$11111000,$00000000

	DC.L	$11111100,$00110000,$00110000,$00110000

	DC.L	$00110000,$00110000,$00110000,$00000000

	DC.L	$11001100,$11001100,$11001100,$11001100

	DC.L	$11001100,$11001100,$01111100,$00000000

	DC.L	$11001100,$11001100,$11001100,$11001100

	DC.L	$11001100,$01111000,$00110000,$00000000

	DC.L	$11000110,$11000110,$11000110,$11010110

	DC.L	$11111110,$11101110,$11000110,$00000000

	DC.L	$11000110,$11000110,$01101100,$00111000

	DC.L	$01101100,$11000110,$11000110,$00000000

	DC.L	$11001100,$11001100,$11001100,$01111000

	DC.L	$00110000,$00110000,$00110000,$00000000

	DC.L	$11111110,$00001100,$00011000,$00110000

	DC.L	$01100000,$11000000,$11111110,$00000000

	DC.L	$01111000,$01100000,$01100000,$01100000

	DC.L	$01100000,$01100000,$01111000,$00000000

	DC.L	$11000000,$01100000,$00110000,$00011000

	DC.L	$00001100,$00000110,$00000010,$00000000

	DC.L	$01111000,$00011000,$00011000,$00011000

	DC.L	$00011000,$00011000,$01111000,$00000000

	DC.L	$00010000,$00111000,$01101100,$11000110

	DC.L	$00000000,$00000000,$00000000,$00000000

	DC.L	$00000000,$00000000,$00000000,$00000000

	DC.L	$00000000,$00000000,$00000000,$11111111

	DC.L	$00110000,$00110000,$00011000,$00000000

	DC.L	$00000000,$00000000,$00000000,$00000000

	DC.L	$00000000,$00000000,$11111000,$00001100

	DC.L	$01111100,$11001100,$01111100,$00000000

	DC.L	$11000000,$11000000,$11111000,$11001100

	DC.L	$11001100,$11001100,$11111000,$00000000

	DC.L	$00000000,$00000000,$01111100,$11000000

	DC.L	$11000000,$11000000,$01111100,$00000000

	DC.L	$00001100,$00001100,$01111100,$11001100

	DC.L	$11001100,$11001100,$01111100,$00000000

	DC.L	$00000000,$00000000,$01111000,$11001100

	DC.L	$11111100,$11000000,$01111100,$00000000

	DC.L	$00111100,$01100000,$01100000,$11111000

	DC.L	$01100000,$01100000,$01100000,$00000000

	DC.L	$00000000,$00000000,$01111100,$11001100

	DC.L	$11001100,$01111100,$00001100,$11111000

	DC.L	$11000000,$11000000,$11111000,$11001100

	DC.L	$11001100,$11001100,$11001100,$00000000

	DC.L	$00110000,$00000000,$00110000,$00110000

	DC.L	$00110000,$00110000,$00110000,$00000000

	DC.L	$00011000,$00000000,$00011000,$00011000

	DC.L	$00011000,$00011000,$00011000,$11110000

	DC.L	$11000000,$11000000,$11001100,$11011000

	DC.L	$11110000,$11011000,$11001100,$00000000

	DC.L	$01110000,$00110000,$00110000,$00110000

	DC.L	$00110000,$00110000,$00110000,$00000000

	DC.L	$00000000,$00000000,$11000110,$11111110

	DC.L	$11010110,$11000110,$11000110,$00000000

	DC.L	$00000000,$00000000,$11111000,$11001100

	DC.L	$11001100,$11001100,$11001100,$00000000

	DC.L	$00000000,$00000000,$01111000,$11001100

	DC.L	$11001100,$11001100,$01111000,$00000000

	DC.L	$00000000,$00000000,$11111000,$11001100

	DC.L	$11001100,$11001100,$11111000,$11000000

	DC.L	$00000000,$00000000,$01111100,$11001100

	DC.L	$11001100,$11001100,$01111100,$00001100

	DC.L	$00000000,$00000000,$11011100,$11100000

	DC.L	$11000000,$11000000,$11000000,$00000000

	DC.L	$00000000,$00000000,$01111100,$11000000

	DC.L	$01111000,$00001100,$11111000,$00000000

	DC.L	$01100000,$01100000,$11111100,$01100000

	DC.L	$01100000,$01100000,$00111100,$00000000

	DC.L	$00000000,$00000000,$11001100,$11001100

	DC.L	$11001100,$11001100,$01111100,$00000000

	DC.L	$00000000,$00000000,$11001100,$11001100

	DC.L	$11001100,$01111000,$00110000,$00000000

	DC.L	$00000000,$00000000,$11000110,$11000110

	DC.L	$11010110,$11111110,$11000110,$00000000

	DC.L	$00000000,$00000000,$11000110,$01101100

	DC.L	$00111000,$01101100,$11000110,$00000000

	DC.L	$00000000,$00000000,$11001100,$11001100

	DC.L	$11001100,$01111100,$00001100,$11111000

	DC.L	$00000000,$00000000,$11111100,$00011000

	DC.L	$00110000,$01100000,$11111100,$00000000

	DC.L	$00011100,$00110000,$00110000,$11100000

	DC.L	$00110000,$00110000,$00011100,$00000000

	DC.L	$00011000,$00011000,$00011000,$00000000

	DC.L	$00011000,$00011000,$00011000,$00000000

	DC.L	$11100000,$00110000,$00110000,$00011100

	DC.L	$00110000,$00110000,$11100000,$00000000

	DC.L	$01110110,$11011100,$00000000,$00000000

	DC.L	$00000000,$00000000,$00000000,$00000000

	DC.L	$00000000,$00010000,$00111000,$01101100

	DC.L	$11000110,$11000110,$11111110,$00000000

	dc.l	$10000000

	dc.l	$00000000

	dc.l	$00000000

	dc.l	$00000000

	dc.l	$00000000

	dc.l	$00000000

	dc.l	$00000000

	dc.l	$00000000

	dc.l	$00011000

	dc.l	$00011000

	dc.l	$00011000

	dc.l	$11000011

	dc.l	$11000011

	dc.l	$00011000

	dc.l	$00011000

	dc.l	$00011000

	dc.l	$00000000

	dc.l	$01100110

	dc.l	$11111110

	dc.l	$11111110

	dc.l	$10011010

	dc.l	$00000010

	dc.l	$00000010

	dc.l	$00000010

	dc.l	$11000000

	dc.l	$11110000

	dc.l	$11111100

	dc.l	$01111000

	dc.l	$01111100

	dc.l	$00100110

	dc.l	$00000011

	dc.l	$00000000

LogoPalette&#58;

				dc.w	$000,$EEE,$EEE,$EEE,$EEE,$EEE,$EEE

LogoCycle&#58;

				dc.w	$EA0,$E80,$E60,$E40,$E20,$E00,$C00,$A00,$800

				dc.w	$A00,$C00,$E00,$E20,$E40,$E60,$E80,$EA0,$E80

				dc.w	$E60,$E40,$E20,$E00,$C00,$A00,$800

But wait! The code needed for the SEGA logo needs to be added!

Under CheckSumCheck add:

Code:

				jsr	 SegaLogo

OK, Now there are 2 SEGA Screens, how do we solve that?

Replace all of SegaScreen with this:

Code:

SegaScreen&#58;		&#59; XREF&#58; GameModeArray

		move.b	#$E4,d0

		bsr.w	PlaySound_Special; stop music

		bsr.w	ClearPLC

		bsr.w	Pal_FadeFrom

		lea	&#40;$C00004&#41;.l,a6

		move.w	#$8004,&#40;a6&#41;

		move.w	#$8230,&#40;a6&#41;

		move.w	#$8407,&#40;a6&#41;

		move.w	#$8700,&#40;a6&#41;

		move.w	#$8B00,&#40;a6&#41;

		clr.b	&#40;$FFFFF64E&#41;.w

		move	#$2700,sr

		move.w	&#40;$FFFFF60C&#41;.w,d0

		andi.b	#$BF,d0

		move.w	d0,&#40;$C00004&#41;.l

		bsr.w	ClearScreen

		move.l	#$40000000,&#40;$C00004&#41;.l

		lea	&#40;Nem_SegaLogo&#41;.l,a0; load Sega	logo patterns

		bsr.w	NemDec

		lea	&#40;$FF0000&#41;.l,a1

		lea	&#40;Eni_SegaLogo&#41;.l,a0; load Sega	logo mappings

		move.w	#0,d0

		bsr.w	EniDec

		lea	&#40;$FF0000&#41;.l,a1

		move.w	#-$A,&#40;$FFFFF632&#41;.w

		move.w	#0,&#40;$FFFFF634&#41;.w

		move.w	#0,&#40;$FFFFF662&#41;.w

		move.w	#0,&#40;$FFFFF660&#41;.w

		move.w	&#40;$FFFFF60C&#41;.w,d0

		ori.b	#$40,d0

		move.w	d0,&#40;$C00004&#41;.l



Sega_GotoTitle&#58;

		move.b	#4,&#40;$FFFFF600&#41;.w; go to title screen

		rts

And there you go! A newer SEGA screen!

Selbi · Dec 22, 2008

Doesn't work! Also, this is the most worst guide I've ever seen! To say "Add this at the beginning of the file" and "At(<-n00b) the end of the file add:" is shit! And who made this? Not you!

SonicVaan · Dec 22, 2008

Selbi said: ↑

Doesn't work! Also, this is the most worst guide I've ever seen! To say "Add this at the beginning of the file" and "At(<-n00b) the end of the file add:" is shit! And who made this? Not you!
Click to expand...

Now don't be bad to him.. He's a newbie and sure there would be some errors.. But don't be so rude

c1owd · Dec 22, 2008

Selbi said: ↑

Doesn't work! Also, this is the most worst guide I've ever seen! To say "Add this at the beginning of the file" and "At(<-n00b) the end of the file add:" is shit! And who made this? Not you!
Click to expand...

yea it dosen't work ............but i don't think it the worst guide i ever seen...........

Selbi · Dec 22, 2008

SonicVaan said: ↑

Selbi said: ↑

Doesn't work! Also, this is the most worst guide I've ever seen! To say "Add this at the beginning of the file" and "At(<-n00b) the end of the file add:" is shit! And who made this? Not you!
Click to expand...

Now don't be bad to him.. He's a newbie and sure there would be some errors.. But don't be so rude
Click to expand...

I can build, but there's only a black screen instead of an nice Sega Screen! Clean up your guide with proper locations! No excuse!

Irixion · Dec 23, 2008

Selbi said: ↑

Doesn't work! Also, this is the most worst guide I've ever seen! To say "Add this at the beginning of the file" and "At(<-n00b) the end of the file add:" is shit! And who made this? Not you!
Click to expand...

Your guides aren't gold either so you'd better shut your mouth.

As for the guide, I haven't tried it but perhaps you left something out? Also, what does 'Newer' SEGA screen supposed to mean?

c1owd · Dec 23, 2008

Irixion said: ↑

Selbi said: ↑

Doesn't work! Also, this is the most worst guide I've ever seen! To say "Add this at the beginning of the file" and "At(<-n00b) the end of the file add:" is shit! And who made this? Not you!
Click to expand...

Your guides aren't gold either so you'd better shut your mouth.

As for the guide, I haven't tried it but perhaps you left something out? Also, what does 'Newer' SEGA screen supposed to mean?
Click to expand...

yea what does the SEGA screen suppossed to look like (pics please) oh and Selbi's tutorials arn't that bad like i couldn't do the spindash tutorial but his video made it easier and i did it........so there not that bad........

c1owd · Dec 29, 2008

CarrascoZX0 said: ↑

Irixion said: ↑

Selbi said: ↑

Doesn't work! Also, this is the most worst guide I've ever seen! To say "Add this at the beginning of the file" and "At(<-n00b) the end of the file add:" is shit! And who made this? Not you!
Click to expand...

Your guides aren't gold either so you'd better shut your mouth.

As for the guide, I haven't tried it but perhaps you left something out? Also, what does 'Newer' SEGA screen supposed to mean?
Click to expand...

yea what does the SEGA screen suppossed to look like (pics please) oh and Selbi's tutorials arn't that bad like i couldn't do the spindash tutorial but his video made it easier and i did it........so there not that bad........
Click to expand...

Son of A Bi**h!!! sorry i had to double post but it fucking worked!!!........(well the sonic retro one did..........even though there both the same)........here's a pic:

but i've seen games older than sonic 1 that have this sega screen.......but yea it works (applied to my hack)

Oerg866 · Feb 9, 2009

WTF! Fuck you all -- Who is responsible for you being a no-brainer and if you unable to follow this guide? This gude works damn fine, in fact, I use this screen on my hack, I layed some PCM music on it and that's it.

You rude pieces of shit.

Btw: I love this screen. For those a) too stupid to get this working, B) curious, c) who don't want to use this screen albeit wanting to have a look at it, here's what it looks like:

Complete with pallette animation and stuff.

PS: Selbi, judging from your posts, you are pretty much an idiot.

How the heck do you want to tell if it isn't his? I mean, sure, it's modeled after the screen that some SEGA Genesis games used, but it takes quite an effort to rebuild, if not port the screen in ASM. And it takes effort YOU don't know to bring up.

Yours,

Oerg866

Selbi · Feb 9, 2009

Oerg866 said: ↑

PS: Selbi, judging from your posts, you are pretty much an idiot.

How the heck do you want to tell if it isn't his? I mean, sure, it's modeled after the screen that some SEGA Genesis games used, but it takes quite an effort to rebuild, if not port the screen in ASM. And it takes effort YOU don't know to bring up.
Click to expand...

Because it's already posted on Sonic Retro. Look here. A simple copy paste! But if "Shaonic" is "OscillateNumInit", then I'm sorry!

Oerg866 · Feb 9, 2009

Dude, I know that it's been posted ad Retro.

Plus, spreading of information is a GOOD thing, right?!

LSD · May 3, 2009

Alright, I got the screen to work, but after that, I got a checksum error, any help?

Selbi · May 3, 2009

Just fix the Checksum. In nearly every Emulator is an option called "Auto Fix Checksum". Enable it. If you still get the error, you made something wrong.

Oerg866 · May 3, 2009

or, well, you could drop the rom onto "FIXHEADR.EXE" which is included to the disassembly.

Or include it to build.bat:

fixheadr s1built.bin

Selbi · May 3, 2009

Oerg866 said: ↑

or, well, you could drop the rom onto "FIXHEADR.EXE" which is included to the disassembly.

Or include it to build.bat:

fixheadr s1built.bin
Click to expand...

It's enabled by default. I don't think he disabled it. Also, sometimes you can get a Checksum error, even with fixheadr.exe.

But if you disabled it, enable it again, using Oerg's method.

LSD · May 3, 2009

Okay, I didn't have AutoFix on. Thanks both of you for helping!

Sephiroth · May 4, 2009

I have to say that this Sega screen is pretty neat. It's a shame that you have to resort to having the artwork in the raw coding, and I'm sure there is an easy way to just incbin the artwork.

Spanner · May 4, 2009

Sephiroth said: ↑

I have to say that this Sega screen is pretty neat. It's a shame that you have to resort to having the artwork in the raw coding, and I'm sure there is an easy way to just incbin the artwork.
Click to expand...

Here you go. It's very easy to assemble the data anyway.

Pokepunch · Dec 2, 2009

There is no sega! music.Or have I done it wrong??

MarkeyJester · Dec 2, 2009

I don't mean to sound rude, I know the fact that this thread is pretty old, but seeing as it's bumped, I'm going to ask something.

Everyone who has posted on this thread before me, can any of you explain WHY it works? i.e. what all those routines do individually to create the SEGA screen?

Just a little curious to see how many people actually know how it navigates, mainly to see if anyone here has actually taken the time to analyse and properly play around with it is all, not to be mean or rude or anything like that. Lets just call it my little research as it were =P

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How to add a newer SEGA screen to Sonic 1

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How to add a newer SEGA screen to Sonic 1

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