A1200 RGB & H-V & C voltage?

Anemos · 02 March 2010, 17:02

Hello folks.
Can be someone plz to check (measuring)the voltage of 23pin out with a good multimeter?
thx!

Stedy · 02 March 2010, 23:44

Hi,

I assume you mean the Horizontal, Vertical and Composite sync of the RGB port?

They are all TTL level. Full details here:

http://www.ianstedman.co.uk/Amiga/am...iga_scart.html

Ian

Anemos · 03 March 2010, 00:41

oh ..
thanks Stedy

dabone · 03 March 2010, 03:24

Ok, hardware gurus, what would be the easiest way to get a 2v peak to peak composite sync signal from the 1200?

Would hooking up a lm1881 to the composite out work for the 15k modes?
Ideally I would be able to take pin 10 and convert it directly so I could get
31.5k modes also. I'm trying to connect a gbs-8200 external scan doubler and the ttl sync doesn't seem to agree with it.

Later,
dabone

Anemos · 03 March 2010, 08:06

i have same problem with similar converter (GBS-8220)..
i have try "before months" this my way,via component (Ypbpr) very stable signa also on hi res l!,but missed the real yellow color..

(if remember good)..this is my "crazy" diagram...
Direct from 23 port:
Amiga red to PR via 330 ohm resistor
Amiga blue to Pb via 330 ohm resistor
Amiga green to Y via 33ohm ~100 ohm resistor
Amiga C sync to Y via caps (no remember size..)
------------------------------------
i have stop to try for months.. maybe i start again my project..

Anemos · 03 March 2010, 09:57

ok.. the new gift for my self!

http://nl.benning.de/en/corporate/pr...ing-mm-p3.html

dabone · 03 March 2010, 11:13

I still swear by mine..

I got it for my 17th birthday.
I'm 39 now and I still use this nearly every day.
Gotta love that kind of quality.

later,
dabone

Anemos · 03 March 2010, 11:20

have a Chinese multimeter before this Benning..
hope is much much better,and accurate.

Anemos · 03 March 2010, 15:12

yeeeess I did! thanks guys..
now the s-video converter working perfect and on my Atari STE! (and natural with svideo-vga later..)

problem was coz Atari has to strong RGB signal..
next is the ZX+3 ..

cya soon..

rkauer · 04 March 2010, 08:15

@Anemos: nice PSU replacement! I have exactly the same one taken from an old Compaq Presario (K6 & Ciryx M3 era!).

I hacked it inside a near dead A1200 heavy duty ( 65W is heavy duty???) white brick, including fan and extra Molex connectors to the outside.

86W of pure Amiga action! Yay! 12A on +5V, 2A on 12V rails. More than enough.

Anemos · 04 March 2010, 08:39

thanks @rkauer ,but main is dead months ago..

I have to change it with other new one 400W.. http://eab.abime.net/showthread.php?t=50297

Anemos · 10 October 2010, 10:12

GBS-8220 CONVERTER

Hello,we know this strange converter is difficult to synchronize with Atari - Amiga via standard RBGS & RGBHV plug input ..
Here is my new solution via YUV input to VGA,screen is stable,no flicker,auto synchronize with PAL/NTSC,..
but losing a little colors like 20% of green,yellow,white,(not so bad).

Screen looks like this

here diagram for Atari-ST

Zetr0 · 10 October 2010, 15:05

@anemos

great work my friend

Have you tried this on a CRT? I believe that you will find that you will get a better picture with a CRT as opposed to an LCD monitor in this regard

Anemos · 10 October 2010, 18:35

Quote:

Originally Posted by Zetr0

@anemos

great work my friend

Have you tried this on a CRT? I believe that you will find that you will get a better picture with a CRT as opposed to an LCD monitor in this regard

Hello Zetr0

No testing yet on my CRT,but yes possible has better picture there there..

dabone · 12 October 2010, 22:30

Did anyone archive these diagrams? I was going to hook mine up tonight and didn't save the pics.

Later,
dabone

Anemos · 13 October 2010, 17:09

Quote:

Originally Posted by dabone

Did anyone archive these diagrams? I was going to hook mine up tonight and didn't save the pics.

Later,
dabone

Hi,sorry my server is down for a sec..
i upload here..

dabone · 15 October 2010, 03:45

Ok, did it, stable pic, but yeah the colors are butt ugly. Deluxe Galaga is really hard to play when you can't tell what colors some things are.

Later,
dabone

Stedy · 16 October 2010, 15:46

One of these kits would help from Jaycar:

http://www.jaycar.co.uk/productView....b&form=KEYWORD
It converts RGB to YPrPB (YUV) suitable for the video adaptors discussed previously.

Have not looked for ready built RGB to YUV converters but there must be some on the market.

Unsure of how the GBS-8220 will handle the sync signals. If you can feed in TTL level H and V Syncs from the Amiga rather than use a sync on green hack this should work best. Without measuring video levels it is hard to know what is best.

HTH

Ian

Anemos · 16 October 2010, 17:04

The GBS-8220 still "wayward" ..my first contact on him..nothing pic excepting display menu..
2 pins of central video IC controller ,took re-solder!
Some info from web saying..this converter working fine on JAMMA arcade boards.

02 March 2010, 17:02	#1
Anemos 70X7 Join Date: Apr 2008 Location: Ἑλλάς Posts: 1,078	A1200 RGB & H-V & C voltage? Hello folks. Can be someone plz to check (measuring)the voltage of 23pin out with a good multimeter? thx! Last edited by Anemos; 02 March 2010 at 17:08.

03 March 2010, 03:24	#4
dabone Registered User Join Date: Oct 2009 Location: Chattanooga TN, USA Posts: 109	Ok, hardware gurus, what would be the easiest way to get a 2v peak to peak composite sync signal from the 1200? Would hooking up a lm1881 to the composite out work for the 15k modes? Ideally I would be able to take pin 10 and convert it directly so I could get 31.5k modes also. I'm trying to connect a gbs-8200 external scan doubler and the ttl sync doesn't seem to agree with it. Later, dabone Last edited by dabone; 03 March 2010 at 03:31.

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02 March 2010, 23:44	#2
Stedy Registered User Join Date: Jan 2008 Location: United Kingdom Age: 46 Posts: 735	Hi, I assume you mean the Horizontal, Vertical and Composite sync of the RGB port? They are all TTL level. Full details here: http://www.ianstedman.co.uk/Amiga/am...iga_scart.html Ian

03 March 2010, 00:41	#3
Anemos 70X7 Join Date: Apr 2008 Location: Ἑλλάς Posts: 1,078	oh .. thanks Stedy

03 March 2010, 08:06	#5
Anemos 70X7 Join Date: Apr 2008 Location: Ἑλλάς Posts: 1,078	i have same problem with similar converter (GBS-8220).. i have try "before months" this my way,via component (Ypbpr) very stable signa also on hi res l!,but missed the real yellow color.. (if remember good)..this is my "crazy" diagram... Direct from 23 port: Amiga red to PR via 330 ohm resistor Amiga blue to Pb via 330 ohm resistor Amiga green to Y via 33ohm ~100 ohm resistor Amiga C sync to Y via caps (no remember size..) ------------------------------------ i have stop to try for months.. maybe i start again my project..

03 March 2010, 09:57	#6
Anemos 70X7 Join Date: Apr 2008 Location: Ἑλλάς Posts: 1,078	ok.. the new gift for my self! http://nl.benning.de/en/corporate/pr...ing-mm-p3.html

03 March 2010, 11:13	#7
dabone Registered User Join Date: Oct 2009 Location: Chattanooga TN, USA Posts: 109	I still swear by mine.. I got it for my 17th birthday. I'm 39 now and I still use this nearly every day. Gotta love that kind of quality. later, dabone

03 March 2010, 11:20	#8
Anemos 70X7 Join Date: Apr 2008 Location: Ἑλλάς Posts: 1,078	have a Chinese multimeter before this Benning.. hope is much much better,and accurate.

03 March 2010, 15:12	#9
Anemos 70X7 Join Date: Apr 2008 Location: Ἑλλάς Posts: 1,078	yeeeess I did! thanks guys.. now the s-video converter working perfect and on my Atari STE! (and natural with svideo-vga later..) problem was coz Atari has to strong RGB signal.. next is the ZX+3 .. cya soon..

04 March 2010, 08:15	#10
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	@Anemos: nice PSU replacement! I have exactly the same one taken from an old Compaq Presario (K6 & Ciryx M3 era!). I hacked it inside a near dead A1200 heavy duty ( 65W is heavy duty???) white brick, including fan and extra Molex connectors to the outside. 86W of pure Amiga action! Yay! 12A on +5V, 2A on 12V rails. More than enough.

04 March 2010, 08:39	#11
Anemos 70X7 Join Date: Apr 2008 Location: Ἑλλάς Posts: 1,078	thanks @rkauer ,but main is dead months ago.. I have to change it with other new one 400W.. http://eab.abime.net/showthread.php?t=50297

10 October 2010, 10:12	#12
Anemos 70X7 Join Date: Apr 2008 Location: Ἑλλάς Posts: 1,078	GBS-8220 CONVERTER Hello,we know this strange converter is difficult to synchronize with Atari - Amiga via standard RBGS & RGBHV plug input .. Here is my new solution via YUV input to VGA,screen is stable,no flicker,auto synchronize with PAL/NTSC,.. but losing a little colors like 20% of green,yellow,white,(not so bad). Screen looks like this here diagram for Atari-ST

10 October 2010, 15:05	#13
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@anemos great work my friend Have you tried this on a CRT? I believe that you will find that you will get a better picture with a CRT as opposed to an LCD monitor in this regard

12 October 2010, 22:30	#15
dabone Registered User Join Date: Oct 2009 Location: Chattanooga TN, USA Posts: 109	Did anyone archive these diagrams? I was going to hook mine up tonight and didn't save the pics. Later, dabone

15 October 2010, 03:45	#17
dabone Registered User Join Date: Oct 2009 Location: Chattanooga TN, USA Posts: 109	Ok, did it, stable pic, but yeah the colors are butt ugly. Deluxe Galaga is really hard to play when you can't tell what colors some things are. Later, dabone

16 October 2010, 15:46	#18
Stedy Registered User Join Date: Jan 2008 Location: United Kingdom Age: 46 Posts: 735	One of these kits would help from Jaycar: http://www.jaycar.co.uk/productView....b&form=KEYWORD It converts RGB to YPrPB (YUV) suitable for the video adaptors discussed previously. Have not looked for ready built RGB to YUV converters but there must be some on the market. Unsure of how the GBS-8220 will handle the sync signals. If you can feed in TTL level H and V Syncs from the Amiga rather than use a sync on green hack this should work best. Without measuring video levels it is hard to know what is best. HTH Ian

16 October 2010, 17:04	#19
Anemos 70X7 Join Date: Apr 2008 Location: Ἑλλάς Posts: 1,078	The GBS-8220 still "wayward" ..my first contact on him..nothing pic excepting display menu.. 2 pins of central video IC controller ,took re-solder! Some info from web saying..this converter working fine on JAMMA arcade boards.

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