MiSTer FPGA Forum

Is anyone else seeing this?

I have a Benq 1702A (I think that's what it is) 15Khz capable LCD monitor. It can look out and out lovely when it's set up right. I have it set up using an HDMI to VGA adapter. direct_video=0 (direct_video refuses to work even though I would think the screen could take the resolutions). It has a native resolution of 1280x1024@60Hz. Sadly that is too big for an Amiga RTG desktop at 17" and everything is really small so we have to go to a lower than native resolution.

If I set the mister to 1024x768@60 for the minimig core and the desktop at the same, specifying HV-Integer scaling which of course it doesn't need to use as it's a1:1 to the frame buffer setting then I can leave the mister on for hours on end and it won't bat an eyelid. Dropping to a PAL game isn't bad at all but there is a sizeable border all round and it's offset to one side - this I know about and it's not the issue.

If instead I specify 800x600@60 the PAL programs have much less of a border and they look pretty good but if I just leave the system at the 800x600@60 RTG desktop the screen blanks for a second or two every now and again. Often enough to be unnerving that something might be wrong. But this is a much better resolution.

I initially thought that I might have been pushing the FPGA clocks a bit hard but it's the LOWER resolution that's blanking out on me so I would have thought that the higher resolution would be pushing harder?

Any ideas?

The monitor is a 31khz monitor and does not support 15khz.

It's also a older LCD Screen, it only handles one resolution, in this case 1280x1024

Here the manual if you want a closer look
https://www.manualslib.com/manual/15623/Benq-Fp731.html
https://esupportdownload.benq.com/esupp ... 731_EN.pdf


You are best off with a HDMI to VGA Adapter with the following settings
video_mode=4
forced_scandoubler=1

The vga_scaler option will do nothing for you as you are using the HDMI out.

Dropping to PAL mode is always going to add a Border, that just PAL for you.

Why did you link manuals for the FP731 when the poster probably means the BL702A?

I wish this forum sent me notifications when people reply or send me messages - I might not need to accidentally stumble over my own posts via google!!

[EDIT] I've now found and changed the required settings - hopefully I'll know this time if someone replies !

Yes, I mean the BL702A. It absolutely can support 50Hz and even 15Khz, even if the specs on the website don't advertise the fact. I can plug my actual Amigas (A1000, A600 and A1200) into it just fine with a simple 23 pin to 15pin d-sub adapter I made. You just need to go into the service menu (I totally forget how now) and disable the irritating non-optimal mode warning that otherwise comes up all the time. You only need to do that once when you first get the monitor.

Anyway, It still does it I believe, I just haven't been using the mister so much lately.