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Re: ATARI 1040 STe black RGB good Composite
Posted: 25 Apr 2022 19:51
by exxos
zChris wrote: 25 Apr 2022 19:47
With me nothing is obvious :lol:
Im using UBE Switch if that helps? What do that mod do anyway?
The UBE allows you to hookup VGA to the ST.. But it will only work with MONO.. unless you have a multisync RGB monitor which supports 15Khz.
https://www.exxosforum.co.uk/forum/viewt ... f=27&t=161
There is a little switch on top to switch between mono and colour modes.
Re: ATARI 1040 STe black RGB good Composite
Posted: 25 Apr 2022 19:58
by zChris
Yeah i got a 15kHz monitor that i've used with other Ataris ST's. Confirmed that the switch, cable, monitor works with another board :)
Unfortunately pressing the switch didn't help.
Worth nothing is that the monitor that's hooked up to RGB doesn't seem to see a signal at all since it goes into sleep mode.
Re: ATARI 1040 STe black RGB good Composite
Posted: 25 Apr 2022 20:02
by exxos
A monitor should not really care about missing RGB.. Monitors only really look for V-sync AFAIK. So you should probably continuity check V&H sync on your socket etc., If you have a scope then see if they are switching. Some monitors are able to use syncs over composite. But not all monitors can AFAIK.
Re: ATARI 1040 STe black RGB good Composite
Posted: 25 Apr 2022 21:08
by zChris
Looking on the monitor port i measured pin 12 (Horizontal) and Pin 9 (Vertical) (ref.
https://info-coach.fr/atari/hardware/interfaces.php).
Picture 1 and 2 is Horizontal while picture 3 is vertical. Looks fine to me. :?
HORIZONTAL1.png
HORIZONTAL2.png
VERTICAL1.png
Re: ATARI 1040 STe black RGB good Composite
Posted: 25 Apr 2022 21:10
by exxos
Vertical should be switching down to 0v.. It looks like it's going down to only 4v.. Are you testing this with nothing connected to the monitor port?
Re: ATARI 1040 STe black RGB good Composite
Posted: 25 Apr 2022 21:13
by zChris
Yeah, only thing connected is the composite cable. Can it be that it switches down to 0 too fast for my equipment to measure it ?
Re: ATARI 1040 STe black RGB good Composite
Posted: 25 Apr 2022 21:16
by exxos
zChris wrote: 25 Apr 2022 21:13
Yeah, only thing connected is the composite cable. Can it be that it switches down to 0 too fast for my equipment to measure it ?
Looks like you got the same scope as me anyway...
Unfortunately VSYNC goes right back to the large GSTMCU...
Capture.PNG
Maybe someone else can confirm the output on their own STE... But it looks like your chip is fried to me.
Re: ATARI 1040 STe black RGB good Composite
Posted: 25 Apr 2022 21:19
by zChris
Even though the composite works ?
Re: ATARI 1040 STe black RGB good Composite
Posted: 25 Apr 2022 21:26
by exxos
zChris wrote: 25 Apr 2022 21:19
Even though the composite works ?
Theoretically should not work with that either. #Welcome to electronics :lol:
Re: ATARI 1040 STe black RGB good Composite
Posted: 26 Apr 2022 05:59
by zChris
:S Hope someone can measure the signal on how it should look like so we can make a crosscheck