How to center the image in PAL VGA mode?
Added by ndary almost 7 years ago
in the Video settings when i select:
Mode: VGA
TV Standard: PAL
the image is not centered on the screen, how can i fix it?
i have noticed that in this mode ExlairXL produce a resolution of 720x576(50HZ) which is not one of the VESA standard resolution and probably that's why the screen is shifted, is there a way to fix it?
i tried to switch the TV Standard: NTSC and the video produced is 640x480 (Which is a vesa standard), but the core keep crashing so i can proceed
any tip will be appriciated
Nir
Replies (12)
RE: How to center the image in PAL VGA mode? - Added by foft almost 7 years ago
Hi Nir,
NTSC works on v8, but not on v7 (it shipped with v7). So if you install that you can switch modes.
Regarding resolution 'pal' mode is 576p50 and 'ntsc' mode is 480p59.94. A lot of modern monitors handle them since they are HDMI standard.
We added the dynamic pll clock chip so we can add more modes. We added the i2c chip so we can talk EDID/DDC with the monitors. These will take a while to implement. Once implemented you would probably have to craft a mode to fix your monitor.
HOWEVER there is NO standard 50Hz mode for VGA:-( Some monitors reject it entirely, some put it off centre. Really down to luck of the draw. You could try turning composite sync on/off. You could also try using 'scandoubler' mode rather the 'vga' which has somewhat different timings (scandoubled atari rather than 576p50 exactly). Or 'rgb' mode which is the 15KHz Hsync mode with original timings.
So ... errr ... basically best to look for a different monitor if you want to use PAL?
Mark
---
-- TODO -- allow ZPU to write these - simple CRTC!
process(out_pal)
begin
if (out_pal = '1') then
h_pixels_across <= 720 - 1;
h_sync_on <= 732 - 1;
h_sync_off <= 795 - 1;
h_end_count <= 864 - 1;
v_pixels_down <= 576 - 1;
v_sync_on <= 581 - 1;
v_sync_off <= 586 - 1;
v_end_count <= 625 - 1;
else
h_pixels_across <= 720 - 1;
h_sync_on <= 736 -1;
h_sync_off <= 798 -1;
h_end_count <= 858 -1;
v_pixels_down <= 480 -1;
v_sync_on <= 489 -1;
v_sync_off <= 495 -1;
v_end_count <= 525 -1;
end if;
end process;
RE: How to center the image in PAL VGA mode? - Added by foft almost 7 years ago
That said if you can make a working 50Hz mode (of similar resolution) with your pc and this monitor, please send me the timings used.
RE: How to center the image in PAL VGA mode? - Added by ndary almost 7 years ago
OK Mark,
where can i download V8? its not it the files section here
Nir
RE: How to center the image in PAL VGA mode? - Added by foft almost 7 years ago
RE: How to center the image in PAL VGA mode? - Added by ndary almost 7 years ago
ok i just downloaded v8.sof, used the USB Blaster to program and its says 100% successful.
still when i switch on NTSC screen crashes?! is that suppose to happen in this version?
it would be nice to have an info on the SETTINGS screen showing what core i have in the board
Nir
RE: How to center the image in PAL VGA mode? - Added by foft almost 7 years ago
If you flashed a sof then it only lasts until you switch off! So when you say 'when I switch on' I guess you reset it back to v7.
RE: How to center the image in PAL VGA mode? - Added by foft almost 7 years ago
To make it last you need to make a .jic file.
RE: How to center the image in PAL VGA mode? - Added by ndary almost 7 years ago
how do i make a jic file?
there is a v8.jic on the folder as well.. can i use it?
Nir
RE: How to center the image in PAL VGA mode? - Added by foft almost 7 years ago
Yes if its there you can use it. There are instructions to make one on the wiki tag.
RE: How to center the image in PAL VGA mode? - Added by ndary almost 7 years ago
ok, managed to get CORE8 flashed
Nir
RE: How to center the image in PAL VGA mode? - Added by foft almost 7 years ago
Does NTSC mode work?
RE: How to center the image in PAL VGA mode? - Added by ndary almost 7 years ago
yes!!!, will test it further later... now texting the XC12 Tape