MSX RGB Cable for Panasonic MSX 2 FS-A1

Resident (54)

01-12-2015, 21:51

Hi!

I bought a MSX RGB Cable from retrogamingcables and it's working great on atleast three televisions, however on my Bang Olufsen, the image is like this:
Guess the game! :P

Anyone have a clue why this might be? If I turn on controller from TV -> AV it looks good for a millisec then it switches to the crappy dark blurr.
Sharp Twin Famicom RGB modded looks great on it. US SNES looks great on it. PAL Mega drive looks great. It's just the MSX which looks weird. :face:

By Manuel

Ascended (19466)

01-12-2015, 22:00

Space Manbow?

By Algorythms

Champion (288)

01-12-2015, 22:20

Vampire Killer!

By Elrinth

Resident (54)

01-12-2015, 22:24

it's not a shmup
But is there some other rgb cable which maybe carries sync or something like that?

Yes Vampire Killer is the correct answer!

By gdx

Enlighted (6213)

02-12-2015, 00:49

Elrinth wrote:

Anyone have a clue why this might be?

Maybe it is caused by the status/ratio signal +12V missing or too weak (pin 8). If that's not enough try to create a voltage of 1~3V at the pin 16.

By Jupp3

Resident (41)

02-12-2015, 00:35

Does this happen on all games? If not, this might be the case of the TV not liking the signal the game forces the system to output. One of the earlier guesses was Space Manbow, which (I think) forces the MSX output NTSC framerate (in which case, it might look wrong on some displays, while games running in PAL look ok.)

By madscient

Master (193)

02-12-2015, 04:25

Suspected "HIC-1" issue...

See below:
http://www.msx.org/forum/msx-talk/hardware/urgent-alert-msx2...

By Elrinth

Resident (54)

02-12-2015, 16:42

I only have two games to try it on. Vampire Killer and Lode Runner.
Next salary I'll order some caps in case there is the HIC-1 issue of leaking caps. That would suck so much. I'll inspect my board whenever I find time. Before that I'll try with just booting it and with Lode Runner to see if there is a difference.

I also need to contact the guy I bought it from and see if he actually already maybe replaced those caps, who knows!?

By meits

Scribe (6544)

02-12-2015, 18:54

Vamprire Killer doesn't change framerate...
Haven't read anywhere in this topic that it's only in games or as well in basic or directly during boot...

By Elrinth

Resident (54)

02-12-2015, 21:22

It happens on basic boot, Lode Runner and Vampire Killer. That's all I have to test on right now.

Here's some video footage of what it looks like:
https://youtu.be/rtwbXCBP2_U

By Wild_Penguin

Hero (644)

02-12-2015, 22:47

I don't mean to hijack, but I have an issue with Sony HB-75P RGB SCART, that might be related (or not). Hypothesis: Although RGB signal is sent trough the SCART, it is interpreted as S-Video (or composite) by the TV.

I have only one TV to test, so behaviour might be TV specific (which might fit into your situation, since it works on some other TVs). My TV (LG) does not allow to set the input type (composite, S-Video, RGB) at all, it is (supposedly) autodetected. If your does, try to force it to RGB - or see if it reports the input type somewhere.

As for my HB-75P symptoms: RGB output blinks on/off and is reddish (mostly missing green - and sometimes during blinking, the composite picture - which is OK - can be seen for a fraction of a second). Composite output is actually fine from the very same SCART connector (the HB-75P has a DIN connector, too, for which I do not have a cable). I measured BLANK signal (pin16) and it is 5V, which is out of spec (should be 1-3V for RGB). Not sure if that is part of the problem or not. Then it occured to me, that my TV might be trying to show the RGB as S-Video. I disconnected pin 19 (composite out) and, the result: correct colors! But the picture is moving up/down and left/right slowly, back and forth (every few seconds), and there are darger bands in the picture. So the TV is struggling to sync with the signal, which I believe is not surprising, since composite is used for SCART RGB syncing (I haven't checked jet properly from the mighty archives of the NET, but preliminarily it looks light that and also I remember it is that way).

So your the problem might be an imcompatibility with the TV and/or out-of-spec RGB output implementation? Just a guess. Try to disconnect pin19 temporarily and see what happens.

(Of course, disconnect it from the SCART cable at the FS-A1 end, not inside the FS-A1. This can be done without damaging the SCART lead with a pin / small flathead screwdriver if one knows how to)

EDIT: Another hypothesis: B&O is expecting component video? Too tired to think about it, but getting R, G and B instead if R-Y, B-Y and Y might produce something like that... so your issue is different. I took pictures of the S-Video mixup, it does look different....