SpritesMind.Net

Posted: **Wed Jan 09, 2008 12:05 pm**

Tested pins [18-25, 120-127] in the same way.
[18-25] - showed noise in the lower part VBlank, below raster (I have PAL console).
[120-127] - showed noise similar to the noise of buses M68K.
Nothing reminds raster. Just VDP has dividers of master clock frequency (I have models with 17,7MHz quartz directly on pins VDP). So, not bad to be included sketches of the VDP circuit in the device "The System C2."

Posted: **Wed Jan 09, 2008 12:13 pm**

You want photos of system C2 arcade board? I have some links... please wait

schematics I don't have any...

EDIT
A pirate one: http://www.mameworld.net/maws/img/pcb/tantr.png

Official: http://www.mameworld.net/maws/img/pcb/puyopuy2.png
http://www.mameworld.net/maws/img/pcb/puyo.png (Low-Res)

Right-click on the links and save target as

High-Resolution pirate (equal to the first one)

http://www.citylan.it/tantrbl3/PCB%20co ... 20side.jpg

The SE-93 is a pirate VDP, TmEE has one in his megadrive (check his website if you don't beleive me)

Also I emailed Charles MacDonald about where those pins (120-127) are leading, but I suspect they are connected to the 2 Srams in the arcade board and a triple DAC... but i'm still waiting for a reply

Posted: **Thu Jan 10, 2008 6:35 am**

SE-93 is like the best pirate VDP chip ever, but unfortunately my MD clone is dead (stupid 7805 fried and killed everything with it).
All is 100% pin compatible, and 100% same in function.

Posted: **Thu Jan 10, 2008 12:26 pm**

I just sent a rom to HwMan, so he can tell me what's on those pins, but I won't release it yet because i'm using the font from hacking cult or devega, and I want to draw my own...

Are you sure the SE-93 is dead? Damn, I once supplied 7.2V to the MD for some minutes, and my original sega vdp did run very hot and it's still alive and kicking... (to payoff, it runs now at a miserable 3.65V, always cold)

Posted: **Thu Jan 10, 2008 12:49 pm**

Jorge Nuno wrote:The SE-93 is a pirate VDP, TmEE has one in his megadrive (check his website if you don't beleive me)

I know this. Also SE-93 = TA-06; SE-95 = TA-04 + TA-05 and SE-95 = TA07 = YM2612.

Jorge Nuno wrote:I just sent a rom to HwMan, so he can tell me what's on those pins, but I won't release it yet because i'm using the font from hacking cult, and I want to draw my own...

I begin test right now!

Posted: **Thu Jan 10, 2008 12:51 pm**

OK thanks again

Posted: **Thu Jan 10, 2008 1:30 pm**

It not starts. I guess you do wrong hardware initialization (or do not at all). I did same mistake, when began make own programms for MD. Do this:

Code: Select all

*Boot code
	move.l	sp,a7
	move.w	#$2700,sr
	tst.l	$a10008.l
	bne.s	SkipJoyDetect
	tst.w	$a1000c.l
SkipJoyDetect:
	Bne	SkipTable
	lea	Table(pc),a5
	movem.w	(a5)+,d5-d7
	movem.l	(a5)+,a0-a4
	move.b	-$10ff(a1),d0		*Version number
	andi.b	#$0f,d0
	beq.s	WrongVersion
	move.l	#$53454741,$2f00(a1)	*Security code (SEGA)
WrongVersion:
	move.w	(a4),d0
	moveq	#$00,d0
	movea.l	d0,a6
	move	a6,usp
	moveq	#$17,d1			*VDP setup
FillLoop:
	move.b	(a5)+,d5
	move.w	d5,(a4)
	add.w	d7,d5
	dbra	d1,FillLoop
	move.l	(a5)+,(a4)
	move.w	d0,(a3)
	move.w	d7,(a1)
	move.w	d7,(a2)
L0250:	btst	d0,(a1)
	bne.s	L0250
	moveq	#$25,d2			*Init A00000
Filla:	move.b	(a5)+,(a0)+
	dbra	d2,Filla
	move.w	d0,(a2)
	move.w	d0,(a1)
	move.w	d7,(a2)
L0262:	move.l	d0,-(a6)		*Zero RAM
	dbra	d6,L0262
	move.l	(a5)+,(a4)
	move.l	(a5)+,(a4)
	moveq	#$1f,d3			*Init C00000
Filc0:	move.l	d0,(a3)
	dbra	d3,Filc0
	move.l	(a5)+,(a4)
	moveq	#$13,d4			*Init C00000
Fillc1:	move.l	d0,(a3)
	dbra	d4,Fillc1
	moveq	#$03,d5			*Init C00011
Fillc2:	move.b	(a5)+,$0011(a3)
	dbra	d5,Fillc2
	move.w	d0,(a2)
	movem.l	(a6),d0-d7/a0-a6
	move	#$2700,sr
	tst.w	$00C00004
	jmp	SkipTable
Table:	dc.w	$8000,$3fff,$0100,$00a0,$0000,$00a1,$1100,$00a1
	dc.w	$1200,$00c0,$0000,$00c0,$0004,$0414,$302c,$0754
	dc.w	$0000,$0000,$0000,$812b,$0001,$0100,$00ff,$ff00
	dc.w	$0080,$4000,$0080,$af01,$d91f,$1127,$0021,$2600
	dc.w	$f977,$edb0,$dde1,$fde1,$ed47,$ed4f,$d1e1,$f108
	dc.w	$d9c1,$d1e1,$f1f9,$f3ed,$5636,$e9e9,$8104,$8f01
	dc.w	$c000,$0000,$4000,$0010,$9fbf,$dfff
SkipTable:

Waiting for fixed one.

Posted: **Thu Jan 10, 2008 1:50 pm**

Did it show the bios message?
Or you have no bios?

I'm trying to manually fix it... if that doesn't work then I will copy the init code

Rom sent...

Posted: **Thu Jan 10, 2008 2:15 pm**

Jorge Nuno wrote:Did it show the bios message?
Or you have no bios?
I'm trying to manually fix it... if that doesn't work then I will copy the init code
Rom sent...

I have an clone, that have no BIOS. That is correct, BIOS do init itself (TMSS), but most of clones have no BIOS. Second round...
***Not working. Can you just copy code above?
You even don't send "SEGA" in security register...

Code: Select all

move.l   #$53454741,$2f00(a1)   *Security code (SEGA)

Posted: **Thu Jan 10, 2008 2:31 pm**

Code: Select all

START:
	NOP
	NOP
	MOVEA.l	#$A11100,		a0
	MOVE.b	-$10ff(a0),		d0
	ANDI.b	#$0f,			d0 
	MOVE.l	($000100),		$2F00(a0)
	BEQ 	Versao0
Versao0:

my first instructions...

I'm copying your code now...

EDIT: Done

LOL the BEQ should be after the ANDI, OMGLOL

Posted: **Thu Jan 10, 2008 2:45 pm**

OK, finally it works.

Posted: **Thu Jan 10, 2008 2:46 pm**

At last LOL, and the pins?

Posted: **Thu Jan 10, 2008 2:55 pm**

Jorge Nuno wrote:At last LOL, and the pins?

LOL. There (on [120-127]) really have an VIDEO. And it remind an index of color. But on [18-25] still quiet. Maybe its activated on CRAM loads?
By the way: pins actived only on "sky". On text no moves there.
What do you think?

Posted: **Thu Jan 10, 2008 3:04 pm**

Jorge Nuno wrote:Are you sure the SE-93 is dead? Damn, I once supplied 7.2V to the MD for some minutes, and my original sega vdp did run very hot and it's still alive and kicking... (to payoff, it runs now at a miserable 3.65V, always cold)

Actually not... but the system didn't boot anymore that's for sure. After burnout, I cleaned the board of most components, but I kept the chips for "nostalgic" reasons... if I get another MD which is not in very good condition, I'll try to see if the chip works, they're so easy to solder to /get off from board. But I doubt it works since the 7805 that fried was connected to digital parts, the other that didn't fry is for analog parts of the chips (AFAIK).

Posted: **Thu Jan 10, 2008 3:07 pm**

HardWareMan wrote:
Jorge Nuno wrote:At last LOL, and the pins?
LOL. There (on [120-127]) really have an VIDEO. And it remind an index of color. But on [18-25] still quiet. Maybe its activated on CRAM loads?
By the way: pins actived only on "sky". On text no moves there.
What do you think?

H0ly $hit!! It seems I figured out the bit that enables the VDP digital output, OMG!!!, you mean the intro didn't show up on pins 120-127???

Please put the "sun" onscreen and watch SPA/B, pin 40

Also forget pins 18-25 for now, I think they are a digital audio output...

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