Please help me to get an XRGB-2 (not plus) to output 31Khz Hsync VGA

Tech Talk
1

I’m trying to get CPS-2 SSF2T working with a VGA crt that will do ~30Khz Hsync using an XRGB-2 (not plus) as a scan converter. When I wire things up, the ‘input’ light on the XRGB-2 comes on, but the 15Khz light is lit, and the CRT indicates that it’s getting a 15Khz Hsync signal.

I don’t read Japanese, so the manual isn’t of much help. Is there some magic button combination that I can push to have the XRGB2 put out 31Khz VGA instead?

In case it matters: To hook the CPS-2 to the XRGB I’m using a hand-wired RGB-21 cable. I don’t know much about RGB-21. I’ve got the RGBS from the JAMMA wired to corresponding pins on the RGB-21 connector, and the video ground hooked to all of the RGBS grounds. (Is there something I should be doing with the other pins? I especially wonder about Video Signal, AV control, and RGB video signal mask - pins 16,11, and 12) http://junkerhq.net/xrgb/index.php/RGB-21 is the best documentation I can find on RGB-21 pinout. (I’ve also seen it referred to as “Japanese SCART”.)

2

You might want to ask on the shmups forum, but have you tried resetting your xrgb 2? Power it off, hold all 4 buttons and power it on.

http://junkerhq.net/xrgb/index.php/XRGB-2

3

Yeah, I’ve tried resetting.

4

Have you tried turning the xrgb2 off, holding up and pressing the power button to turn it on? That is supposed to force 31khz output (15khz forced is down + power, according to the pdf i found)

5

That did the trick. Thanks.
If the PDF is in English, can you link to it please?

6
7

Thanks.

8

Hi everyone,
I’m trying to get and XRGB2 Plus to output a 15Khz signal from a 30Khz VGA input (Downscan). There is no English manual I can find online or any info on how to do this :confused: Anyone out there able to help?

My application is running MAME from my PC to my 15Khz RGB monitor.

9

Did you look at the PDF file linked above?

Turn it on while holding power and ‘downward triangle’.

10

Yep, tried that. I read through that manual but the 2 and 2 plus are very different. When I hold down triangle and power on it enters 47khz mode I believe (thats what lights up), which is a mode the predecessor didn’t have.

Hopefully someone here has a 2 Plus that has tried it, or translated manual. I’m also curious what syncs the XRGB 2 / 2Plus output on the monitor side (horizontal, vertical, composite, all 3?) Theres a lot of documentation out there for the SCART input but almost nothing for the VGA and monitor outputs that I could find.

11

Sorry. Missed the “plus” reading comprehension FTW… I guess I’d try powering up with different button combinations.

Not sure if this is the 15Khz mode you’re looking for:
http://junkerhq.net/xrgb/index.php?title=XRGB-2_plus#
How to enable low screen resolution ?

Options → Low screen resolution → ON
XRGB-2 plus will be able to output at 320x240 (15 kHz) and 640x400 (24 kHz).
Note : this option should be used only with a classic japanese PC monitor (PC-988x and X68k).