Houston we have S-Video...

Charlie · 15 August 2008, 16:01

When's the last time I posted something of what I'm up to?
When's the last time I posted any Amiga-related p0rn..?

Ok, ok... almost never...

Here you go then:

Click on the images
if you like:
Big-Ones!

Hmmm, giving away a bit here - but not that much

Shoonay · 15 August 2008, 16:40

/me wants to see more piccies... how you take care of her... how you make love to her...

gklinger · 15 August 2008, 16:48

What am I seeing here exactly?

coze · 15 August 2008, 17:12

is this zetro's board ?

alexh · 15 August 2008, 17:26

That looks like an A1200... can you not get S-Video directly from the onboard video encoder using nothing more than 3 wires and an S-Video connector?

Charlie · 15 August 2008, 17:36

Ah, further info required, no probs:

There's quite a bunch of stuff on dispaly here - one of my on-going A1200 projects that I've STILL not finished...

The Saga of S-Video:
Once Upon a time...
A certain Wizzard with a soldering iron began a project to build an Amiga VGA-> S-Video adapter - I expect its release to be a truly joyous experience for one & all.

This wholesome plan got Charlie the butcher a-thinking...
'S-Video, eh', I thought. 'My CD32 has S-Video and it produces crisp & tasty output on the old TFT telly.'
I reasoned; 'Why the hell didn't C= put such a port in the A1200? My old C= monitor is taking up too much room, I'm too cheap to buy one of those Indy-vision thingamies...' And low - the light dawned. 'I bet most of the circuitry is already present in an A1200 - time to butcher!'
Well, I journeyed to the far land of SEGA & communed with the guru who is Megadrive. 'So, it's S-Video you want foolish youth. Why come to me for advice when many great sages in the land of Amiga have already beaten you to it?'
Chargined I returned to the pastures I knew with schematics in my hand to discover that indeed Megadrive spake truthfully. I hatched my plan, I guirded my loins...
...While guirding mightyly I stumbled across a guru of wholsome aspect in the shape of DJBase. We spake thusly:
Me: 'Oh great master I have been on a long journey seeking enlightenment.'
DJBase: 'And what is it that you seek my son?'

(This lead me to surmise that he may be no other than Darth Vader himself, but as I'm pretty sure my name isn't Luke I got back to the point)

Me: 'I have been seeking wisdom regarding improved clarity of vision. I have made my plans but have come to realise you've got a better one than me.'
DJBase: 'Ah, that's what they all say. Would you like me to give you one?'
Me: 'Um, an S-Video adapter would be just fine thank you.'

And so it was that I spent a scary hour-or-so giving my darling A1200 the old hot-rodding, and indeed Megadrive & DJBase spake truthfully. My vision is indeed cleared markedly.

Much more might I say regarding the modding of the A1200, but for now I'll invite you to peruse the piccies more closely.

P.S.
Yes, the signals are all there, but the chip doesn't have the grunt to directly drive an S-Video signal. The little circuit board is a signal amplifier.

adolescent · 15 August 2008, 17:46

Damn that's a big pointer! Looks good though.

gklinger · 15 August 2008, 17:48

Quote:

Originally Posted by Charlie

Yes, the signals are all there, but the chip doesn't have the grunt to directly drive an S-Video signal. The little circuit board is a signal amplifier.

I see. Where did you obtain the wee amplifier?

Anubis · 15 August 2008, 18:05

Quote:

Originally Posted by alexh

That looks like an A1200... can you not get S-Video directly from the onboard video encoder using nothing more than 3 wires and an S-Video connector?

More info, please.

Charlie · 15 August 2008, 18:05

Hmmm, I've heard DJBase is a very nice chap...
...he's also the one who makes that groovy little circuit board.

Things to say:
-There's nothing to stop you doing this yourself, but his version is far better than any horror I might have hacked together.
-Take a close look @ your mobo. There is a small surface mount chip obscured by DJBase's circut in the above piccies. You need to solder four wires to its legs - very fiddly! For me this was getting pretty close to the limit of my skill / equipment.

alexh · 15 August 2008, 18:21

Quote:

Originally Posted by Anubis

More info, please.

The video encoder on the A1200 motherboard is the Sony CXA1145 which as well as converting RGB+Sync into composite it also produces luma and chroma which are not AFAIK wired up.

This guide for the NeoGeo shows you how to add a fully working S-Video cable to a Sony CXA1145 using a couple of transistors and some resistors and a 74LS273 (buffer).

Quote:

Originally Posted by Charlie

Yes, the signals are all there, but the chip doesn't have the grunt to directly drive an S-Video signal. The little circuit board is a signal amplifier.

Interesting. This is a custom circuit board? It probably implements something similar to the above guide? (Much nicer).

Quote:

Originally Posted by Charlie

You need to solder four wires

Four? Luma out, chroma out, power & ground?

Charlie · 15 August 2008, 18:32

Quote:

Originally Posted by alexh

...Four? Luma out, chroma out, power & ground?

Yep.

alexh · 15 August 2008, 18:38

This is the datasheet for a CXA1145 compatible chip (all the CXA1145 datasheets I can find are in Jap)

DJBase · 15 August 2008, 18:50

The small SVideo pcb is based on the real C= Amiga CD32 schematics which is an open secret.

Anubis · 15 August 2008, 18:58

Thank you alexh!

Charlie, where did you get your amplifier? How much they go for? Is there any diagram how to diy?

The whole thing does not seems complicated, but it would definitely move me to get some better soldering tools. (two solders I have together costed about 10 bucks

- zetr0 would kill me if I use that on Amiga

)

rkauer · 15 August 2008, 19:58

Just a hint for people with a broken CXA1145: the CXA1645 is its successor and totally pin-compatible.

Charlie · 15 August 2008, 20:32

Quote:

Originally Posted by Anubis

Thank you alexh!

Charlie, where did you get your amplifier? How much they go for? Is there any diagram how to diy?

The whole thing does not seems complicated, but it would definitely move me to get some better soldering tools. (two solders I have together costed about 10 bucks

- zetr0 would kill me if I use that on Amiga

)

This little beauty is nothing to do with me - it's DJBase's work & very nice it is too.

Schematics?
Apart from being surface mount as far as I can see it's much the same as the version posted by Zetr0 in this very forum - incidentally the reason why I learned of this version.
Also the following links may be of interest - where I got my info from when I was planning to do this myself. (not as well obviously)

S-Video for CXA1145 or MB3514

SEGA Genesis S-Video Mod
(and other stuff)

This Link had info on A1200 specific S-Video butchery. Would likely be the path I'd have followed if I'd done it myself - seems not to be working ATM.

@Alexh:
I've seen complaints on a few forums that the data-sheet for this chip is Japanese only...
...Not relevant to me I'm glad to say as all I've done is follow other's guidance & in the end use another's pre-made circuit too!

P.S.
It's worth saying that though I'm very pleased with the results the soldering is not for the faint-hearted - very fiddly, at least for me.
This is a great mod & DJBase's PCB is a marvellous bit of design IMO. But doing this mod could very easily result in a mullered computer.

I'd say Zetr0's 'Narmi' board has it's own advantages & I'm certainly looking forward to mine.

TheCorfiot · 15 August 2008, 23:08

Charlie

Nice one Mate AWESOME

TC

mfilos · 16 August 2008, 16:50

I also got some months ago the same S-VHS adapter from DJBase for my A1200.
It worked like a charm on my 23" LCD/TV where RGB-->Scart cables gave me some issues with scrolling lines! Excellent quality and very small PCB. Not hard to solder the 4 required cables on top of the U12 chip

gklinger · 16 August 2008, 16:54

DJBase's adaptor is equally good for the 600, yes?

15 August 2008, 16:01	#1
Charlie . . Mouse . . Join Date: Jun 2005 Location: Nowhere Age: 55 Posts: 1,792	Houston we have S-Video... When's the last time I posted something of what I'm up to? When's the last time I posted any Amiga-related p0rn..? Ok, ok... almost never... Here you go then: Click on the images if you like: Big-Ones! Hmmm, giving away a bit here - but not that much Last edited by Charlie; 15 August 2008 at 16:15.

15 August 2008, 17:36	#6
Charlie . . Mouse . . Join Date: Jun 2005 Location: Nowhere Age: 55 Posts: 1,792	Ah, further info required, no probs: There's quite a bunch of stuff on dispaly here - one of my on-going A1200 projects that I've STILL not finished... The Saga of S-Video: Once Upon a time... A certain Wizzard with a soldering iron began a project to build an Amiga VGA-> S-Video adapter - I expect its release to be a truly joyous experience for one & all. This wholesome plan got Charlie the butcher a-thinking... 'S-Video, eh', I thought. 'My CD32 has S-Video and it produces crisp & tasty output on the old TFT telly.' I reasoned; 'Why the hell didn't C= put such a port in the A1200? My old C= monitor is taking up too much room, I'm too cheap to buy one of those Indy-vision thingamies...' And low - the light dawned. 'I bet most of the circuitry is already present in an A1200 - time to butcher!' Well, I journeyed to the far land of SEGA & communed with the guru who is Megadrive. 'So, it's S-Video you want foolish youth. Why come to me for advice when many great sages in the land of Amiga have already beaten you to it?' Chargined I returned to the pastures I knew with schematics in my hand to discover that indeed Megadrive spake truthfully. I hatched my plan, I guirded my loins... ...While guirding mightyly I stumbled across a guru of wholsome aspect in the shape of DJBase. We spake thusly: Me: 'Oh great master I have been on a long journey seeking enlightenment.' DJBase: 'And what is it that you seek my son?' (This lead me to surmise that he may be no other than Darth Vader himself, but as I'm pretty sure my name isn't Luke I got back to the point) Me: 'I have been seeking wisdom regarding improved clarity of vision. I have made my plans but have come to realise you've got a better one than me.' DJBase: 'Ah, that's what they all say. Would you like me to give you one?' Me: 'Um, an S-Video adapter would be just fine thank you.' And so it was that I spent a scary hour-or-so giving my darling A1200 the old hot-rodding, and indeed Megadrive & DJBase spake truthfully. My vision is indeed cleared markedly. Much more might I say regarding the modding of the A1200, but for now I'll invite you to peruse the piccies more closely. P.S. Yes, the signals are all there, but the chip doesn't have the grunt to directly drive an S-Video signal. The little circuit board is a signal amplifier. Last edited by Charlie; 15 August 2008 at 17:43.

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15 August 2008, 16:40	#2
Shoonay Global Caturator Join Date: Aug 2004 Location: Porando Age: 43 Posts: 6,105	/me wants to see more piccies... how you take care of her... how you make love to her...

15 August 2008, 16:48	#3
gklinger Vegetable Lasagna Join Date: Mar 2007 Location: Toronto, CANADA Age: 54 Posts: 711	What am I seeing here exactly?

15 August 2008, 17:12	#4
coze hastala vista winny vista Join Date: Feb 2006 Location: mt fuji Age: 46 Posts: 1,335	is this zetro's board ?

15 August 2008, 17:26	#5
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,331	That looks like an A1200... can you not get S-Video directly from the onboard video encoder using nothing more than 3 wires and an S-Video connector?

15 August 2008, 17:46	#7
adolescent Powered by Motorola Join Date: Feb 2002 Location: Redondo Beach, CA Age: 52 Posts: 1,065	Damn that's a big pointer! Looks good though.

15 August 2008, 18:05	#10
Charlie . . Mouse . . Join Date: Jun 2005 Location: Nowhere Age: 55 Posts: 1,792	Hmmm, I've heard DJBase is a very nice chap... ...he's also the one who makes that groovy little circuit board. Things to say: -There's nothing to stop you doing this yourself, but his version is far better than any horror I might have hacked together. -Take a close look @ your mobo. There is a small surface mount chip obscured by DJBase's circut in the above piccies. You need to solder four wires to its legs - very fiddly! For me this was getting pretty close to the limit of my skill / equipment.

15 August 2008, 18:38	#13
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,331	This is the datasheet for a CXA1145 compatible chip (all the CXA1145 datasheets I can find are in Jap)

15 August 2008, 18:50	#14
DJBase Amiga is my Religion Join Date: May 2005 Location: Germany Posts: 578	The small SVideo pcb is based on the real C= Amiga CD32 schematics which is an open secret.

15 August 2008, 18:58	#15
Anubis Retro Gamer Join Date: Jan 2005 Location: Underworld Age: 51 Posts: 4,058	Thank you alexh! Charlie, where did you get your amplifier? How much they go for? Is there any diagram how to diy? The whole thing does not seems complicated, but it would definitely move me to get some better soldering tools. (two solders I have together costed about 10 bucks - zetr0 would kill me if I use that on Amiga )

15 August 2008, 19:58	#16
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	Just a hint for people with a broken CXA1145: the CXA1645 is its successor and totally pin-compatible.

15 August 2008, 23:08	#18
TheCorfiot Amibay Senior Staff Join Date: Feb 2008 Location: Cardiff / Wales Posts: 1,302	Charlie Nice one Mate AWESOME TC

16 August 2008, 16:50	#19
mfilos Paranoid Amigoid Join Date: Mar 2008 Location: Athens/Greece Age: 45 Posts: 1,978	I also got some months ago the same S-VHS adapter from DJBase for my A1200. It worked like a charm on my 23" LCD/TV where RGB-->Scart cables gave me some issues with scrolling lines! Excellent quality and very small PCB. Not hard to solder the 4 required cables on top of the U12 chip

16 August 2008, 16:54	#20
gklinger Vegetable Lasagna Join Date: Mar 2007 Location: Toronto, CANADA Age: 54 Posts: 711	DJBase's adaptor is equally good for the 600, yes?

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