diff --git a/software/sys_controller/ossc/avconfig.h b/software/sys_controller/ossc/avconfig.h
index d2aaf88..4cd7fce 100644
--- a/software/sys_controller/ossc/avconfig.h
+++ b/software/sys_controller/ossc/avconfig.h
@@ -89,6 +89,7 @@ typedef struct {
     alt_u8 pm_480i;
     alt_u8 pm_480p;
     alt_u8 pm_1080i;
+    alt_u8 pt_mode;
     alt_u8 l2_mode;
     alt_u8 l3_mode;
     alt_u8 l4_mode;
diff --git a/software/sys_controller/ossc/firmware.h b/software/sys_controller/ossc/firmware.h
index edaf51b..f402c11 100644
--- a/software/sys_controller/ossc/firmware.h
+++ b/software/sys_controller/ossc/firmware.h
@@ -24,10 +24,10 @@
 #include "sysconfig.h"
 
 #define FW_VER_MAJOR            1
-#define FW_VER_MINOR            9
+#define FW_VER_MINOR            10
 
 #define PROFILE_VER_MAJOR       1
-#define PROFILE_VER_MINOR       6
+#define PROFILE_VER_MINOR       10
 
 #define INITCFG_VER_MAJOR       1
 #define INITCFG_VER_MINOR       0
diff --git a/software/sys_controller/ossc/menu.c b/software/sys_controller/ossc/menu.c
index f5c68b0..9ffa1cb 100644
--- a/software/sys_controller/ossc/menu.c
+++ b/software/sys_controller/ossc/menu.c
@@ -55,6 +55,7 @@ static const char *s480p_mode_desc[] = { LNG("Auto","ｵｰﾄ"), "DTV 480p", "V
 static const char *s400p_mode_desc[] = { "VGA 640x400@70", "VGA 720x400@70" };
 static const char *sync_lpf_desc[] = { LNG("2.5MHz (max)","2.5MHz (ｻｲﾀﾞｲ)"), LNG("10MHz (med)","10MHz (ﾁｭｳｲ)"), LNG("33MHz (min)","33MHz (ｻｲｼｮｳ)"), LNG("Off","ｵﾌ") };
 static const char *stc_lpf_desc[] = { "4.8MHz (HDTV/PC)", "0.5MHz (SDTV)", "1.7MHz (EDTV)" };
+static const char *pt_mode_desc[] = {"Normal", "High samplerate", LNG("512x240 optim.","512x240 ｻｲﾃｷｶ."), LNG("384x240 optim.","384x240 ｻｲﾃｷｶ."), LNG("320x240 optim.","320x240 ｻｲﾃｷｶ."), LNG("256x240 optim.","256x240 ｻｲﾃｷｶ.") };
 static const char *l3_mode_desc[] = { LNG("Generic 16:9","ｼﾞｪﾈﾘｯｸ 16:9"), LNG("Generic 4:3","ｼﾞｪﾈﾘｯｸ 4:3"), LNG("512x240 optim.","512x240 ｻｲﾃｷｶ."), LNG("384x240 optim.","384x240 ｻｲﾃｷｶ."), LNG("320x240 optim.","320x240 ｻｲﾃｷｶ."), LNG("256x240 optim.","256x240 ｻｲﾃｷｶ.") };
 static const char *l2l4l5l6_mode_desc[] = { LNG("Generic 4:3","ｼﾞｪﾈﾘｯｸ 4:3"), LNG("512x240 optim.","512x240 ｻｲﾃｷｶ."), LNG("384x240 optim.","384x240 ｻｲﾃｷｶ."), LNG("320x240 optim.","320x240 ｻｲﾃｷｶ."), LNG("256x240 optim.","256x240 ｻｲﾃｷｶ.") };
 static const char *l5_fmt_desc[] = { "1920x1080", "1600x1200", "1920x1200" };
@@ -178,6 +179,7 @@ MENU(menu_output, P99_PROTECT({ \
     { LNG("480i/576i proc","480i/576iｼｮﾘ"),     OPT_AVCONFIG_SELECTION, { .sel = { &tc.pm_480i,         OPT_WRAP, SETTING_ITEM(pm_480i_desc) } } },
     { LNG("480p/576p proc","480p/576pｼｮﾘ"),     OPT_AVCONFIG_SELECTION, { .sel = { &tc.pm_480p,         OPT_WRAP, SETTING_ITEM(pm_480p_desc) } } },
     { LNG("960i/1080i proc","960i/1080iｼｮﾘ"),   OPT_AVCONFIG_SELECTION, { .sel = { &tc.pm_1080i,        OPT_WRAP, SETTING_ITEM(pm_1080i_desc) } } },
+    { "Passthru mode",                         OPT_AVCONFIG_SELECTION, { .sel = { &tc.pt_mode,         OPT_WRAP,  SETTING_ITEM(pt_mode_desc) } } },
     { LNG("Line2x mode","Line2xﾓｰﾄﾞ"),          OPT_AVCONFIG_SELECTION, { .sel = { &tc.l2_mode,         OPT_WRAP, SETTING_ITEM(l2l4l5l6_mode_desc) } } },
     { LNG("Line3x mode","Line3xﾓｰﾄﾞ"),          OPT_AVCONFIG_SELECTION, { .sel = { &tc.l3_mode,         OPT_WRAP, SETTING_ITEM(l3_mode_desc) } } },
     { LNG("Line4x mode","Line4xﾓｰﾄﾞ"),          OPT_AVCONFIG_SELECTION, { .sel = { &tc.l4_mode,         OPT_WRAP, SETTING_ITEM(l2l4l5l6_mode_desc) } } },
diff --git a/software/sys_controller/ossc/video_modes.c b/software/sys_controller/ossc/video_modes.c
index 2b292a1..511ac5b 100644
--- a/software/sys_controller/ossc/video_modes.c
+++ b/software/sys_controller/ossc/video_modes.c
@@ -135,7 +135,12 @@ int get_pure_lm_mode(avconfig_t *cc, mode_data_t *vm_in, mode_data_t *vm_out, vm
 {
     int i, diff_lines, diff_v_hz_x100, mindiff_id=0, mindiff_lines=1000, mindiff_v_hz_x100=10000;
     mode_data_t *mode_preset;
-    mode_flags valid_lm[] = { MODE_PT, (MODE_L2 | (MODE_L2<<cc->l2_mode)), (MODE_L3_GEN_16_9<<cc->l3_mode), (MODE_L4_GEN_4_3<<cc->l4_mode), (MODE_L5_GEN_4_3<<cc->l5_mode), (MODE_L6_GEN_4_3<<cc->l6_mode) };
+    mode_flags valid_lm[] = { (MODE_PT | (cc->pt_mode ? (MODE_L5_GEN_4_3<<(cc->pt_mode-1)) : 0)),
+                              (MODE_L2 | (MODE_L2<<cc->l2_mode)),
+                              (MODE_L3_GEN_16_9<<cc->l3_mode),
+                              (MODE_L4_GEN_4_3<<cc->l4_mode),
+                              (MODE_L5_GEN_4_3<<cc->l5_mode),
+                              (MODE_L6_GEN_4_3<<cc->l6_mode) };
     mode_flags target_lm, mindiff_lm;
     uint8_t pt_only = 0;
     uint8_t upsample2x = cc->upsample2x;
@@ -243,6 +248,10 @@ int get_pure_lm_mode(avconfig_t *cc, mode_data_t *vm_in, mode_data_t *vm_out, vm
 
     mindiff_lm &= mode_preset->flags;    //ensure L2 mode uniqueness
 
+    // Set passthru flag for all passthru mode options
+    if (*group_ptr[mode_preset->group] == 0)
+        mindiff_lm = MODE_PT;
+
     if (mindiff_lm >= MODE_L6_GEN_4_3)
         vm_conf->y_rpt = 5;
     else if (mindiff_lm >= MODE_L5_GEN_4_3)
@@ -258,6 +267,13 @@ int get_pure_lm_mode(avconfig_t *cc, mode_data_t *vm_in, mode_data_t *vm_out, vm
         case MODE_PT:
             vm_out->vic = vm_in->vic;
 
+            if ((cc->pt_mode == 1) && ((mode_preset->group >= GROUP_384P) && (mode_preset->group <= GROUP_576P))) {
+                vmode_hv_mult(vm_in, 2, 1);
+                vmode_hv_mult(vm_out, 2, 1);
+            } else if ((cc->pt_mode >= 2) && (mode_preset->group >= GROUP_240P) && (mode_preset->group <= GROUP_288P)) {
+                vm_conf->x_rpt = vm_conf->h_skip = cc->pt_mode;
+            }
+
             // multiply horizontal resolution if necessary to fulfill min. 25MHz TMDS clock requirement. Tweak infoframe pixel repetition indicator later to make sink treat it as original resolution.
             while ((((vm_out->timings.v_hz_x100*vm_out->timings.v_total)/100)*vm_out->timings.h_total*(vm_conf->h_skip+1))>>vm_out->timings.interlaced < 25000000UL) {
                 vm_conf->x_rpt = vm_conf->h_skip = 2*(vm_conf->h_skip+1)-1;