NTSC non-interlaced mode doesn't work properly.

[IvanDSM]

Setting the "Interlaced" setting to Off on the menu stretches the emulator's screen such that only half the screen is displayed. I'm trying to use the emulator in 240p. Am I doing something wrong?

I'm using a SCPH-90XXX console with the latest release [x.3.3], connected to a CRT through component cables. I can provide a picture if necessary!

[IvanDSM]

I was able to fix this issue with a small change to the source code. Here's the diff:

diff --git a/src/drivers/ps2/init.c b/src/drivers/ps2/init.c
index 4c447c7..6b13f00 100644
--- a/src/drivers/ps2/init.c
+++ b/src/drivers/ps2/init.c
@@ -168,7 +168,7 @@ void init_custom_screen()
         gsGlobal->Interlace = GS_INTERLACED;
         gsGlobal->Field = GS_FIELD;
         gsGlobal->Width = 640;
-        gsGlobal->Height = 448;
+        gsGlobal->Height = 480;
         VCK = 4;
     }
     else if (Settings.display == 1) {

I realized that the code that deals with the non-interlaced mode in src/drivers/ps2/init.c (pasted below) would result in a 640x224 video mode when using the NTSC non-interlaced mode. Changing the NTSC resolution to 640x480 as done above so that the non-interlaced mode would be 640x240 fixed the image.

if (Settings.display == 0 || Settings.display == 1) {
        if (!Settings.interlace) {
            gsGlobal->Interlace = GS_NONINTERLACED;
            gsGlobal->Height = gsGlobal->Height / 2; <-- This results in 640x224 in NTSC
            VCK = 2;
        }
    }

[smeagol44]

I was able to fix this issue with a small change to the source code. Here's the diff:

diff --git a/src/drivers/ps2/init.c b/src/drivers/ps2/init.c
index 4c447c7..6b13f00 100644
--- a/src/drivers/ps2/init.c
+++ b/src/drivers/ps2/init.c
@@ -168,7 +168,7 @@ void init_custom_screen()
         gsGlobal->Interlace = GS_INTERLACED;
         gsGlobal->Field = GS_FIELD;
         gsGlobal->Width = 640;
-        gsGlobal->Height = 448;
+        gsGlobal->Height = 480;
         VCK = 4;
     }
     else if (Settings.display == 1) {

I realized that the code that deals with the non-interlaced mode in src/drivers/ps2/init.c (pasted below) would result in a 640x224 video mode when using the NTSC non-interlaced mode. Changing the NTSC resolution to 640x480 as done above so that the non-interlaced mode would be 640x240 fixed the image.

if (Settings.display == 0 || Settings.display == 1) {
        if (!Settings.interlace) {
            gsGlobal->Interlace = GS_NONINTERLACED;
            gsGlobal->Height = gsGlobal->Height / 2; <-- This results in 640x224 in NTSC
            VCK = 2;
        }
    }

Can you upload a compiled .elf somewhere? Would greatly appreciate it!

[KingKannibal]

I would also like access to an elf with this tweak. I'm using a 9PT50 and 240p games look the best on it without the flickering from the interlaced 480i signal.

[AKuHAK]

NES resolutions:
PAL: 256x240
NTSC: 256x240 - overscan = 256x224

or doubled:
PAL: 512x480
NTSC: 512x448

unfortunately, PS2 doesn't handle 512 widths, so I changed it to 640 in all resolutions
in fact, I think it is possible to add one more overscan (left and right) so the picture will not be stretched. Your solution will lead to non-pixel-perfect output, while now it is pixel perfect.
Picture will get more blurry in your case.

[MondoGecko]

I was able to fix this issue with a small change to the source code. Here's the diff:

diff --git a/src/drivers/ps2/init.c b/src/drivers/ps2/init.c
index 4c447c7..6b13f00 100644
--- a/src/drivers/ps2/init.c
+++ b/src/drivers/ps2/init.c
@@ -168,7 +168,7 @@ void init_custom_screen()
         gsGlobal->Interlace = GS_INTERLACED;
         gsGlobal->Field = GS_FIELD;
         gsGlobal->Width = 640;
-        gsGlobal->Height = 448;
+        gsGlobal->Height = 480;
         VCK = 4;
     }
     else if (Settings.display == 1) {

I realized that the code that deals with the non-interlaced mode in src/drivers/ps2/init.c (pasted below) would result in a 640x224 video mode when using the NTSC non-interlaced mode. Changing the NTSC resolution to 640x480 as done above so that the non-interlaced mode would be 640x240 fixed the image.

if (Settings.display == 0 || Settings.display == 1) {
        if (!Settings.interlace) {
            gsGlobal->Interlace = GS_NONINTERLACED;
            gsGlobal->Height = gsGlobal->Height / 2; <-- This results in 640x224 in NTSC
            VCK = 2;
        }
    }

Also wondering if you could please upload your compiled .elf. I would love to play 240p on my CRT and the interlaced flickering is just too much on the eyes.