diff --git a/3rdparty/rcheevos/include/rc_api_runtime.h b/3rdparty/rcheevos/include/rc_api_runtime.h
index 5b5552ca54..fef1b8769d 100644
--- a/3rdparty/rcheevos/include/rc_api_runtime.h
+++ b/3rdparty/rcheevos/include/rc_api_runtime.h
@@ -220,6 +220,8 @@ typedef struct rc_api_award_achievement_request_t {
   uint32_t hardcore;
   /* The hash associated to the game being played */
   const char* game_hash;
+  /* The number of seconds since the achievement was unlocked */
+  uint32_t seconds_since_unlock;
 }
 rc_api_award_achievement_request_t;
 
@@ -263,6 +265,8 @@ typedef struct rc_api_submit_lboard_entry_request_t {
   int32_t score;
   /* The hash associated to the game being played */
   const char* game_hash;
+  /* The number of seconds since the leaderboard attempt was completed */
+  uint32_t seconds_since_completion;
 }
 rc_api_submit_lboard_entry_request_t;
 
diff --git a/3rdparty/rcheevos/src/rapi/rc_api_runtime.c b/3rdparty/rcheevos/src/rapi/rc_api_runtime.c
index 1a183f214e..0ad58f01fe 100644
--- a/3rdparty/rcheevos/src/rapi/rc_api_runtime.c
+++ b/3rdparty/rcheevos/src/rapi/rc_api_runtime.c
@@ -412,6 +412,8 @@ int rc_api_init_award_achievement_request(rc_api_request_t* request, const rc_ap
     rc_url_builder_append_unum_param(&builder, "h", api_params->hardcore ? 1 : 0);
     if (api_params->game_hash && *api_params->game_hash)
       rc_url_builder_append_str_param(&builder, "m", api_params->game_hash);
+    if (api_params->seconds_since_unlock)
+      rc_url_builder_append_unum_param(&builder, "o", api_params->seconds_since_unlock);
 
     /* Evaluate the signature. */
     md5_init(&md5);
@@ -420,6 +422,14 @@ int rc_api_init_award_achievement_request(rc_api_request_t* request, const rc_ap
     md5_append(&md5, (md5_byte_t*)api_params->username, (int)strlen(api_params->username));
     snprintf(buffer, sizeof(buffer), "%d", api_params->hardcore ? 1 : 0);
     md5_append(&md5, (md5_byte_t*)buffer, (int)strlen(buffer));
+    if (api_params->seconds_since_unlock) {
+      /* second achievement id is needed by delegated unlock. including it here allows overloading
+       * the hash generating code on the server */
+      snprintf(buffer, sizeof(buffer), "%u", api_params->achievement_id);
+      md5_append(&md5, (md5_byte_t*)buffer, (int)strlen(buffer));
+      snprintf(buffer, sizeof(buffer), "%u", api_params->seconds_since_unlock);
+      md5_append(&md5, (md5_byte_t*)buffer, (int)strlen(buffer));
+    }
     md5_finish(&md5, digest);
     rc_format_md5(buffer, digest);
     rc_url_builder_append_str_param(&builder, "v", buffer);
@@ -505,6 +515,9 @@ int rc_api_init_submit_lboard_entry_request(rc_api_request_t* request, const rc_
     if (api_params->game_hash && *api_params->game_hash)
       rc_url_builder_append_str_param(&builder, "m", api_params->game_hash);
 
+    if (api_params->seconds_since_completion)
+      rc_url_builder_append_unum_param(&builder, "o", api_params->seconds_since_completion);
+
     /* Evaluate the signature. */
     md5_init(&md5);
     snprintf(buffer, sizeof(buffer), "%u", api_params->leaderboard_id);
@@ -512,6 +525,10 @@ int rc_api_init_submit_lboard_entry_request(rc_api_request_t* request, const rc_
     md5_append(&md5, (md5_byte_t*)api_params->username, (int)strlen(api_params->username));
     snprintf(buffer, sizeof(buffer), "%d", api_params->score);
     md5_append(&md5, (md5_byte_t*)buffer, (int)strlen(buffer));
+    if (api_params->seconds_since_completion) {
+      snprintf(buffer, sizeof(buffer), "%u", api_params->seconds_since_completion);
+      md5_append(&md5, (md5_byte_t*)buffer, (int)strlen(buffer));
+    }
     md5_finish(&md5, digest);
     rc_format_md5(buffer, digest);
     rc_url_builder_append_str_param(&builder, "v", buffer);
diff --git a/3rdparty/rcheevos/src/rc_client.c b/3rdparty/rcheevos/src/rc_client.c
index fc09c7d346..822a59b0f4 100644
--- a/3rdparty/rcheevos/src/rc_client.c
+++ b/3rdparty/rcheevos/src/rc_client.c
@@ -578,13 +578,7 @@ static int rc_client_get_image_url(char buffer[], size_t buffer_size, int image_
   image_request.image_name = image_name;
   result = rc_api_init_fetch_image_request(&request, &image_request);
   if (result == RC_OK)
-  {
-    const size_t url_length = strlen(request.url);
-    if (url_length >= buffer_size)
-      result = RC_INSUFFICIENT_BUFFER;
-    else
-      memcpy(buffer, request.url, url_length + 1);
-  }
+    snprintf(buffer, buffer_size, "%s", request.url);
 
   rc_api_destroy_request(&request);
   return result;
@@ -1440,7 +1434,6 @@ static void rc_client_activate_game(rc_client_load_state_t* load_state, rc_api_s
   rc_mutex_lock(&client->state.mutex);
   load_state->progress = (client->state.load == load_state) ?
       RC_CLIENT_LOAD_GAME_STATE_DONE : RC_CLIENT_LOAD_GAME_STATE_ABORTED;
-  client->state.load = NULL;
   rc_mutex_unlock(&client->state.mutex);
 
   if (load_state->progress != RC_CLIENT_LOAD_GAME_STATE_DONE) {
@@ -1461,17 +1454,15 @@ static void rc_client_activate_game(rc_client_load_state_t* load_state, rc_api_s
           start_session_response->num_unlocks, RC_CLIENT_ACHIEVEMENT_UNLOCKED_SOFTCORE);
     }
 
+    /* make the loaded game active if another game is not aleady being loaded. */
     rc_mutex_lock(&client->state.mutex);
-    if (client->state.load == NULL)
+    if (client->state.load == load_state)
       client->game = load_state->game;
+    else
+      load_state->progress = RC_CLIENT_LOAD_GAME_STATE_ABORTED;
     rc_mutex_unlock(&client->state.mutex);
 
-    if (client->game != load_state->game) {
-      /* previous load state was aborted */
-      if (load_state->callback)
-        load_state->callback(RC_ABORTED, "The requested game is no longer active", client, load_state->callback_userdata);
-    }
-    else {
+    if (load_state->progress != RC_CLIENT_LOAD_GAME_STATE_ABORTED) {
       /* if a change media request is pending, kick it off */
       rc_client_pending_media_t* pending_media;
 
@@ -1481,6 +1472,9 @@ static void rc_client_activate_game(rc_client_load_state_t* load_state, rc_api_s
       rc_mutex_unlock(&load_state->client->state.mutex);
 
       if (pending_media) {
+        /* rc_client_check_pending_media will fail if it can't find the game in client->game or
+         * client->state.load->game. since we've detached the load_state, this has to occur after
+         * we've made the game active. */
         if (pending_media->hash) {
           rc_client_begin_change_media_from_hash(client, pending_media->hash,
             pending_media->callback, pending_media->callback_userdata);
@@ -1494,12 +1488,50 @@ static void rc_client_activate_game(rc_client_load_state_t* load_state, rc_api_s
         rc_client_free_pending_media(pending_media);
       }
 
-      /* client->game must be set before calling this function so it can query the console_id */
+      rc_mutex_lock(&client->state.mutex);
+      if (client->state.load != load_state)
+        load_state->progress = RC_CLIENT_LOAD_GAME_STATE_ABORTED;
+      rc_mutex_unlock(&client->state.mutex);
+    }
+
+    /* if the game is still being loaded, make sure all the required memory addresses are accessible
+     * so we can mark achievements as unsupported before loading them into the runtime. */
+    if (load_state->progress != RC_CLIENT_LOAD_GAME_STATE_ABORTED) {
+      /* TODO: it is desirable to not do memory reads from a background thread. Some emulators (like Dolphin) don't
+       *       allow it. Dolphin's solution is to use a dummy read function that says all addresses are valid and
+       *       switches to the actual read function after the callback is called. latter invalid reads will
+       *       mark achievements as unsupported. */
+
+      /* ASSERT: client->game must be set before calling this function so the read_memory callback can query the console_id */
       rc_client_validate_addresses(load_state->game, client);
 
+      rc_mutex_lock(&client->state.mutex);
+      if (client->state.load != load_state)
+        load_state->progress = RC_CLIENT_LOAD_GAME_STATE_ABORTED;
+      rc_mutex_unlock(&client->state.mutex);
+    }
+
+    /* if the game is still being loaded, load any active acheivements/leaderboards into the runtime */
+    if (load_state->progress != RC_CLIENT_LOAD_GAME_STATE_ABORTED) {
       rc_client_activate_achievements(load_state->game, client);
       rc_client_activate_leaderboards(load_state->game, client);
 
+      /* detach the load state to indicate that loading is fully complete */
+      rc_mutex_lock(&client->state.mutex);
+      if (client->state.load == load_state)
+        client->state.load = NULL;
+      else
+        load_state->progress = RC_CLIENT_LOAD_GAME_STATE_ABORTED;
+      rc_mutex_unlock(&client->state.mutex);
+    }
+
+    /* one last sanity check to make sure the game is still being loaded. */
+    if (load_state->progress == RC_CLIENT_LOAD_GAME_STATE_ABORTED) {
+      /* game has been unloaded, or another game is being loaded over the top of this game */
+      if (load_state->callback)
+        load_state->callback(RC_ABORTED, "The requested game is no longer active", client, load_state->callback_userdata);
+    }
+    else {
       if (load_state->hash->hash[0] != '[') {
         if (load_state->client->state.spectator_mode != RC_CLIENT_SPECTATOR_MODE_LOCKED) {
           /* schedule the periodic ping */
@@ -2007,7 +2039,6 @@ static int rc_client_attach_load_state(rc_client_t* client, rc_client_load_state
 {
   if (client->state.load == NULL) {
     rc_client_unload_game(client);
-    client->state.load = load_state;
 
     if (load_state->game == NULL) {
       load_state->game = rc_client_allocate_game();
@@ -2018,6 +2049,10 @@ static int rc_client_attach_load_state(rc_client_t* client, rc_client_load_state
         return 0;
       }
     }
+
+    rc_mutex_lock(&client->state.mutex);
+    client->state.load = load_state;
+    rc_mutex_unlock(&client->state.mutex);
   }
   else if (client->state.load != load_state) {
     /* previous load was aborted */
@@ -2621,8 +2656,6 @@ static void rc_client_game_mark_ui_to_be_hidden(rc_client_t* client, rc_client_g
 void rc_client_unload_game(rc_client_t* client)
 {
   rc_client_game_info_t* game;
-  rc_client_scheduled_callback_data_t** last;
-  rc_client_scheduled_callback_data_t* next;
 
   if (!client)
     return;
@@ -2649,29 +2682,38 @@ void rc_client_unload_game(rc_client_t* client)
   if (client->state.load) {
     /* this mimics rc_client_abort_async without nesting the lock */
     client->state.load->async_handle.aborted = RC_CLIENT_ASYNC_ABORTED;
+
+    /* if the game is still being loaded, let the load process clean it up */
+    if (client->state.load->game == game)
+      game = NULL;
+
     client->state.load = NULL;
   }
 
   if (client->state.spectator_mode == RC_CLIENT_SPECTATOR_MODE_LOCKED)
     client->state.spectator_mode = RC_CLIENT_SPECTATOR_MODE_ON;
 
-  if (game != NULL)
+  if (game != NULL) {
+    rc_client_scheduled_callback_data_t** last;
+    rc_client_scheduled_callback_data_t* next;
+
     rc_client_game_mark_ui_to_be_hidden(client, game);
 
-  last = &client->state.scheduled_callbacks;
-  do {
-    next = *last;
-    if (!next)
-      break;
+    last = &client->state.scheduled_callbacks;
+    do {
+      next = *last;
+      if (!next)
+        break;
 
-    /* remove rich presence ping scheduled event for game */
-    if (next->callback == rc_client_ping && game && next->related_id == game->public_.id) {
-      *last = next->next;
-      continue;
-    }
+      /* remove rich presence ping scheduled event for game */
+      if (next->callback == rc_client_ping && next->related_id == game->public_.id) {
+        *last = next->next;
+        continue;
+      }
 
-    last = &next->next;
-  } while (1);
+      last = &next->next;
+    } while (1);
+  }
 
   rc_mutex_unlock(&client->state.mutex);
 
@@ -3534,7 +3576,7 @@ typedef struct rc_client_award_achievement_callback_data_t
   uint32_t retry_count;
   uint8_t hardcore;
   const char* game_hash;
-  time_t unlock_time;
+  rc_clock_t unlock_time;
   rc_client_t* client;
   rc_client_scheduled_callback_data_t* scheduled_callback_data;
 } rc_client_award_achievement_callback_data_t;
@@ -3685,6 +3727,11 @@ static void rc_client_award_achievement_server_call(rc_client_award_achievement_
   api_params.hardcore = ach_data->hardcore;
   api_params.game_hash = ach_data->game_hash;
 
+  if (ach_data->retry_count) {
+    const rc_clock_t now = ach_data->client->callbacks.get_time_millisecs(ach_data->client);
+    api_params.seconds_since_unlock = (uint32_t)((now - ach_data->unlock_time) / 1000);
+  }
+
   result = rc_api_init_award_achievement_request(&request, &api_params);
   if (result != RC_OK) {
     RC_CLIENT_LOG_ERR_FORMATTED(ach_data->client, "Error constructing unlock request for achievement %u: %s", ach_data->id, rc_error_str(result));
@@ -3751,7 +3798,8 @@ static void rc_client_award_achievement(rc_client_t* client, rc_client_achieveme
   callback_data->client = client;
   callback_data->id = achievement->public_.id;
   callback_data->hardcore = client->state.hardcore;
-  callback_data->unlock_time = achievement->public_.unlock_time;
+  callback_data->game_hash = client->game->public_.hash;
+  callback_data->unlock_time = client->callbacks.get_time_millisecs(client);
 
   if (client->game) /* may be NULL if this gets called while unloading the game (from another thread - events are raised outside the lock) */
     callback_data->game_hash = client->game->public_.hash;
@@ -4185,7 +4233,7 @@ typedef struct rc_client_submit_leaderboard_entry_callback_data_t
   int32_t score;
   uint32_t retry_count;
   const char* game_hash;
-  time_t submit_time;
+  rc_clock_t submit_time;
   rc_client_t* client;
   rc_client_scheduled_callback_data_t* scheduled_callback_data;
 } rc_client_submit_leaderboard_entry_callback_data_t;
@@ -4340,6 +4388,11 @@ static void rc_client_submit_leaderboard_entry_server_call(rc_client_submit_lead
   api_params.score = lboard_data->score;
   api_params.game_hash = lboard_data->game_hash;
 
+  if (lboard_data->retry_count) {
+    const rc_clock_t now = lboard_data->client->callbacks.get_time_millisecs(lboard_data->client);
+    api_params.seconds_since_completion = (uint32_t)((now - lboard_data->submit_time) / 1000);
+  }
+
   result = rc_api_init_submit_lboard_entry_request(&request, &api_params);
   if (result != RC_OK) {
     RC_CLIENT_LOG_ERR_FORMATTED(lboard_data->client, "Error constructing submit leaderboard entry for leaderboard %u: %s", lboard_data->id, rc_error_str(result));
@@ -4383,7 +4436,7 @@ static void rc_client_submit_leaderboard_entry(rc_client_t* client, rc_client_le
   callback_data->id = leaderboard->public_.id;
   callback_data->score = leaderboard->value;
   callback_data->game_hash = client->game->public_.hash;
-  callback_data->submit_time = time(NULL);
+  callback_data->submit_time = client->callbacks.get_time_millisecs(client);
 
   RC_CLIENT_LOG_INFO_FORMATTED(client, "Submitting %s (%d) for leaderboard %u: %s",
       leaderboard->public_.tracker_value, leaderboard->value, leaderboard->public_.id, leaderboard->public_.title);
diff --git a/3rdparty/rcheevos/src/rc_libretro.c b/3rdparty/rcheevos/src/rc_libretro.c
index 14398ef1ec..d343ce78ce 100644
--- a/3rdparty/rcheevos/src/rc_libretro.c
+++ b/3rdparty/rcheevos/src/rc_libretro.c
@@ -36,6 +36,17 @@ typedef struct rc_disallowed_core_settings_t
   const rc_disallowed_setting_t* disallowed_settings;
 } rc_disallowed_core_settings_t;
 
+
+static const rc_disallowed_setting_t _rc_disallowed_beetle_psx_settings[] = {
+  { "beetle_psx_cpu_freq_scale", "<100" },
+  { NULL, NULL }
+};
+
+static const rc_disallowed_setting_t _rc_disallowed_beetle_psx_hw_settings[] = {
+  { "beetle_psx_hw_cpu_freq_scale", "<100" },
+  { NULL, NULL }
+};
+
 static const rc_disallowed_setting_t _rc_disallowed_bsnes_settings[] = {
   { "bsnes_region", "pal" },
   { NULL, NULL }
@@ -80,6 +91,11 @@ static const rc_disallowed_setting_t _rc_disallowed_fceumm_settings[] = {
   { NULL, NULL }
 };
 
+static const rc_disallowed_setting_t _rc_disallowed_flycast_settings[] = {
+  { "reicast_sh4clock", "<200" },
+  { NULL, NULL }
+};
+
 static const rc_disallowed_setting_t _rc_disallowed_gpgx_settings[] = {
   { "genesis_plus_gx_lock_on", ",action replay (pro),game genie" },
   { "genesis_plus_gx_region_detect", "pal" },
@@ -108,6 +124,7 @@ static const rc_disallowed_setting_t _rc_disallowed_neocd_settings[] = {
 };
 
 static const rc_disallowed_setting_t _rc_disallowed_pcsx_rearmed_settings[] = {
+  { "pcsx_rearmed_psxclock", "<55" },
   { "pcsx_rearmed_region", "pal" },
   { NULL, NULL }
 };
@@ -140,6 +157,11 @@ static const rc_disallowed_setting_t _rc_disallowed_snes9x_settings[] = {
   { NULL, NULL }
 };
 
+static const rc_disallowed_setting_t _rc_disallowed_swanstation_settings[] = {
+  { "swanstation_CPU_Overclock", "<100" },
+  { NULL, NULL }
+};
+
 static const rc_disallowed_setting_t _rc_disallowed_vice_settings[] = {
   { "vice_autostart", "disabled" }, /* autostart dictates initial load and reset from menu */
   { "vice_reset", "!autostart" }, /* reset dictates behavior when pressing reset button (END) */
@@ -152,6 +174,8 @@ static const rc_disallowed_setting_t _rc_disallowed_virtual_jaguar_settings[] =
 };
 
 static const rc_disallowed_core_settings_t rc_disallowed_core_settings[] = {
+  { "Beetle PSX", _rc_disallowed_beetle_psx_settings },
+  { "Beetle PSX HW", _rc_disallowed_beetle_psx_hw_settings },
   { "bsnes-mercury", _rc_disallowed_bsnes_settings },
   { "cap32", _rc_disallowed_cap32_settings },
   { "dolphin-emu", _rc_disallowed_dolphin_settings },
@@ -160,6 +184,7 @@ static const rc_disallowed_core_settings_t rc_disallowed_core_settings[] = {
   { "ecwolf", _rc_disallowed_ecwolf_settings },
   { "FCEUmm", _rc_disallowed_fceumm_settings },
   { "FinalBurn Neo", _rc_disallowed_fbneo_settings },
+  { "Flycast", _rc_disallowed_flycast_settings },
   { "Genesis Plus GX", _rc_disallowed_gpgx_settings },
   { "Genesis Plus GX Wide", _rc_disallowed_gpgx_wide_settings },
   { "Mesen", _rc_disallowed_mesen_settings },
@@ -171,6 +196,7 @@ static const rc_disallowed_core_settings_t rc_disallowed_core_settings[] = {
   { "QUASI88", _rc_disallowed_quasi88_settings },
   { "SMS Plus GX", _rc_disallowed_smsplus_settings },
   { "Snes9x", _rc_disallowed_snes9x_settings },
+  { "SwanStation", _rc_disallowed_swanstation_settings },
   { "VICE x64", _rc_disallowed_vice_settings },
   { "Virtual Jaguar", _rc_disallowed_virtual_jaguar_settings },
   { NULL, NULL }
@@ -186,6 +212,12 @@ static int rc_libretro_string_equal_nocase_wildcard(const char* test, const char
   return (*value == '\0');
 }
 
+static int rc_libretro_numeric_less_than(const char* test, const char* value) {
+  int test_num = atoi(test);
+  int value_num = atoi(value);
+  return (test_num < value_num);
+}
+
 static int rc_libretro_match_value(const char* val, const char* match) {
   /* if value starts with a comma, it's a CSV list of potential matches */
   if (*match == ',') {
@@ -218,6 +250,10 @@ static int rc_libretro_match_value(const char* val, const char* match) {
   if (*match == '!')
     return !rc_libretro_match_value(val, &match[1]);
 
+  /* a leading less tahn means the provided value is the minimum allowed */
+  if (*match == '<')
+    return rc_libretro_numeric_less_than(val, &match[1]);
+
   /* just a single value, attempt to match it */
   return rc_libretro_string_equal_nocase_wildcard(val, match);
 }
diff --git a/3rdparty/rcheevos/src/rc_version.h b/3rdparty/rcheevos/src/rc_version.h
index 7ed7301d27..4f8c25e364 100644
--- a/3rdparty/rcheevos/src/rc_version.h
+++ b/3rdparty/rcheevos/src/rc_version.h
@@ -8,7 +8,7 @@
 RC_BEGIN_C_DECLS
 
 #define RCHEEVOS_VERSION_MAJOR 11
-#define RCHEEVOS_VERSION_MINOR 5
+#define RCHEEVOS_VERSION_MINOR 6
 #define RCHEEVOS_VERSION_PATCH 0
 
 #define RCHEEVOS_MAKE_VERSION(major, minor, patch) (major * 1000000 + minor * 1000 + patch)
diff --git a/3rdparty/rcheevos/src/rcheevos/consoleinfo.c b/3rdparty/rcheevos/src/rcheevos/consoleinfo.c
index b8bee226d4..98b43b6d04 100644
--- a/3rdparty/rcheevos/src/rcheevos/consoleinfo.c
+++ b/3rdparty/rcheevos/src/rcheevos/consoleinfo.c
@@ -721,16 +721,29 @@ static const rc_memory_regions_t rc_memory_regions_n64 = { _rc_memory_regions_n6
 /* ===== Nintendo DS ===== */
 /* https://www.akkit.org/info/gbatek.htm#dsmemorymaps */
 static const rc_memory_region_t _rc_memory_regions_nintendo_ds[] = {
-    { 0x000000U, 0x3FFFFFU, 0x02000000U, RC_MEMORY_TYPE_SYSTEM_RAM, "System RAM" }
+    { 0x0000000U, 0x03FFFFFU, 0x02000000U, RC_MEMORY_TYPE_SYSTEM_RAM, "System RAM" },
+    /* To keep DS/DSi memory maps aligned, padding is set here for the DSi's extra RAM */
+    { 0x0400000U, 0x0FFFFFFU, 0x02400000U, RC_MEMORY_TYPE_UNUSED, "Unused (DSi exclusive)" },
+    /* The DS/DSi have "tightly coupled memory": very fast memory directly connected to the CPU.
+     * This memory has an instruction variant (ITCM) and a data variant (DTCM).
+     * For achievement purposes it is useful to be able to access the data variant.
+     * This memory does not have a fixed address on console, being able to be moved to any $0xxxx000 region.
+     * While normally this kind of memory is addressed outside of the possible native addressing space, this is simply not possible,
+     * as the DS/DSi's address space covers all possible uint32_t values.
+     * $0E000000 is used here as a "pseudo-end," as this is nearly the end of all the memory actually mapped to addresses
+     * This means that (with the exception of $FFFF0000 onwards, which has the ARM9 BIOS mapped) $0E000000 onwards has nothing mapped to it
+     */
+    { 0x1000000U, 0x1003FFFU, 0x0E000000U, RC_MEMORY_TYPE_SYSTEM_RAM, "Data TCM" }
 };
-static const rc_memory_regions_t rc_memory_regions_nintendo_ds = { _rc_memory_regions_nintendo_ds, 1 };
+static const rc_memory_regions_t rc_memory_regions_nintendo_ds = { _rc_memory_regions_nintendo_ds, 3 };
 
 /* ===== Nintendo DSi ===== */
 /* https://problemkaputt.de/gbatek.htm#dsiiomap */
 static const rc_memory_region_t _rc_memory_regions_nintendo_dsi[] = {
-    { 0x000000U, 0xFFFFFFU, 0x02000000U, RC_MEMORY_TYPE_SYSTEM_RAM, "System RAM" }
+    { 0x0000000U, 0x0FFFFFFU, 0x02000000U, RC_MEMORY_TYPE_SYSTEM_RAM, "System RAM" },
+    { 0x1000000U, 0x1003FFFU, 0x0E000000U, RC_MEMORY_TYPE_SYSTEM_RAM, "Data TCM" }
 };
-static const rc_memory_regions_t rc_memory_regions_nintendo_dsi = { _rc_memory_regions_nintendo_dsi, 1 };
+static const rc_memory_regions_t rc_memory_regions_nintendo_dsi = { _rc_memory_regions_nintendo_dsi, 2 };
 
 /* ===== Oric ===== */
 static const rc_memory_region_t _rc_memory_regions_oric[] = {
@@ -956,6 +969,31 @@ static const rc_memory_region_t _rc_memory_regions_wonderswan[] = {
 };
 static const rc_memory_regions_t rc_memory_regions_wonderswan = { _rc_memory_regions_wonderswan, 2 };
 
+/* ===== ZX Spectrum ===== */
+/* https://github.com/TASEmulators/BizHawk/blob/3a3b22c/src/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum16K/ZX16.cs
+ * https://github.com/TASEmulators/BizHawk/blob/3a3b22c/src/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Machine/ZXSpectrum48K/ZX48.Memory.cs
+ * https://worldofspectrum.org/faq/reference/128kreference.htm */
+static const rc_memory_region_t _rc_memory_regions_zx_spectrum[] = {
+    /* ZX Spectrum is complicated as multiple models exist with varying amounts of memory.
+     * In practice, this can be reduced to two categories: 16K/48K units, and 128K units.
+     * 16K/48K units have RAM starting at $4000 onwards, 16K ending at $7FFF, 48K ending at $FFFF.
+     * 128K units have banked memory, with $4000-$7FFF normally having RAM bank 5, and $8000-$BFFF normally having RAM bank 2.
+     * $C000-$FFFF is normally reserved for banked RAM, having any of banks 0-7.
+     * For the purposes of the RAM map, $C000-$FFFF is assumed to be bank 0, and $10000 onwards has the other banks in order (1, 3, 4, 6, 7)
+     * Doing it this way always for 16K/48K games to have the same memory map on the 128K, and thus avoid issues due to the model selected.
+     * Later 128K units also have a special banking mode that changes up banking completely, but for 16K/48K compatibility purposes this doesn't matter, and so is irrelevant.
+     */
+    { 0x00000U, 0x03FFFU, 0x04000U, RC_MEMORY_TYPE_SYSTEM_RAM, "Screen RAM" }, /* RAM bank 5 on 128K units */
+    { 0x04000U, 0x07FFFU, 0x08000U, RC_MEMORY_TYPE_SYSTEM_RAM, "System RAM" }, /* RAM bank 2 on 128K units */
+    { 0x08000U, 0x0BFFFU, 0x0C000U, RC_MEMORY_TYPE_SYSTEM_RAM, "System RAM" }, /* RAM bank 0-7 on 128K units, assumed to be bank 0 here */
+    { 0x0C000U, 0x0FFFFU, 0x10000U, RC_MEMORY_TYPE_SYSTEM_RAM, "System RAM" }, /* RAM bank 1 on 128K units */
+    { 0x10000U, 0x13FFFU, 0x14000U, RC_MEMORY_TYPE_SYSTEM_RAM, "System RAM" }, /* RAM bank 3 on 128K units */
+    { 0x14000U, 0x17FFFU, 0x18000U, RC_MEMORY_TYPE_SYSTEM_RAM, "System RAM" }, /* RAM bank 4 on 128K units */
+    { 0x18000U, 0x1BFFFU, 0x1C000U, RC_MEMORY_TYPE_SYSTEM_RAM, "System RAM" }, /* RAM bank 6 on 128K units */
+    { 0x1C000U, 0x1FFFFU, 0x20000U, RC_MEMORY_TYPE_SYSTEM_RAM, "Screen RAM" } /* RAM bank 7 on 128K units */
+};
+static const rc_memory_regions_t rc_memory_regions_zx_spectrum = { _rc_memory_regions_zx_spectrum, 8 };
+
 /* ===== default ===== */
 static const rc_memory_regions_t rc_memory_regions_none = { 0, 0 };
 
@@ -1141,6 +1179,9 @@ const rc_memory_regions_t* rc_console_memory_regions(uint32_t console_id)
     case RC_CONSOLE_WONDERSWAN:
       return &rc_memory_regions_wonderswan;
 
+    case RC_CONSOLE_ZX_SPECTRUM:
+      return &rc_memory_regions_zx_spectrum;
+
     default:
       return &rc_memory_regions_none;
   }
diff --git a/3rdparty/rcheevos/src/rcheevos/lboard.c b/3rdparty/rcheevos/src/rcheevos/lboard.c
index 98b4ec2f17..47e05f2738 100644
--- a/3rdparty/rcheevos/src/rcheevos/lboard.c
+++ b/3rdparty/rcheevos/src/rcheevos/lboard.c
@@ -199,19 +199,19 @@ int rc_evaluate_lboard(rc_lboard_t* self, int32_t* value, rc_peek_t peek, void*
           /* start and submit are both true in the same frame, just submit without announcing the leaderboard is available */
           self->state = RC_LBOARD_STATE_TRIGGERED;
         }
-        else if (self->start.requirement == 0 && self->start.alternative == 0) {
-          /* start condition is empty - this leaderboard is submit-only with no measured progress */
+        else if (!self->start.requirement && !self->start.alternative) {
+          /* start trigger is empty. assume the leaderboard is in development and ignore */
         }
         else {
           /* start the leaderboard attempt */
           self->state = RC_LBOARD_STATE_STARTED;
-
-          /* reset any hit counts in the value */
-          if (self->progress)
-            rc_reset_value(self->progress);
-
-          rc_reset_value(&self->value);
         }
+
+        /* reset any hit counts in the value */
+        if (self->progress)
+          rc_reset_value(self->progress);
+
+        rc_reset_value(&self->value);
       }
       break;
 
diff --git a/3rdparty/rcheevos/src/rcheevos/rc_validate.c b/3rdparty/rcheevos/src/rcheevos/rc_validate.c
index bd3b305a4b..770f9dc987 100644
--- a/3rdparty/rcheevos/src/rcheevos/rc_validate.c
+++ b/3rdparty/rcheevos/src/rcheevos/rc_validate.c
@@ -726,6 +726,7 @@ static int rc_validate_conflicting_conditions(const rc_condset_t* conditions, co
   const rc_condition_t* condition;
   const rc_condition_t* condition_chain_start;
   int overlap;
+  int chain_matches;
 
   /* empty group */
   if (conditions == NULL || compare_conditions == NULL)
@@ -777,9 +778,9 @@ static int rc_validate_conflicting_conditions(const rc_condset_t* conditions, co
 
       /* if combining conditions exist, make sure the same combining conditions exist in the
        * compare logic. conflicts can only occur if the combinining conditions match. */
+      chain_matches = 1;
       if (condition_chain_start != condition)
       {
-        int chain_matches = 1;
         const rc_condition_t* condition_chain_iter = condition_chain_start;
         while (condition_chain_iter != condition)
         {
@@ -795,11 +796,8 @@ static int rc_validate_conflicting_conditions(const rc_condset_t* conditions, co
           if (compare_condition->oper != RC_OPERATOR_NONE &&
             !rc_validate_are_operands_equal(&compare_condition->operand2, &condition_chain_iter->operand2))
           {
-            if (compare_condition->operand2.type != condition_chain_iter->operand2.type)
-            {
-              chain_matches = 0;
-              break;
-            }
+            chain_matches = 0;
+            break;
           }
 
           if (!compare_condition->next)
@@ -808,17 +806,27 @@ static int rc_validate_conflicting_conditions(const rc_condset_t* conditions, co
             break;
           }
 
+          if (compare_condition->type != RC_CONDITION_ADD_ADDRESS &&
+              compare_condition->type != RC_CONDITION_ADD_SOURCE &&
+              compare_condition->type != RC_CONDITION_SUB_SOURCE &&
+              compare_condition->type != RC_CONDITION_AND_NEXT)
+          {
+            /* things like AddHits and OrNext are hard to definitively detect conflicts. ignore them. */
+            chain_matches = 0;
+            break;
+          }
+
           compare_condition = compare_condition->next;
           condition_chain_iter = condition_chain_iter->next;
         }
+      }
 
-        /* combining field didn't match, or there's more unmatched combining fields. ignore this condition */
-        if (!chain_matches || rc_validate_is_combining_condition(compare_condition))
-        {
-          while (compare_condition->next && rc_validate_is_combining_condition(compare_condition))
-            compare_condition = compare_condition->next;
-          continue;
-        }
+      /* combining field didn't match, or there's more unmatched combining fields. ignore this condition */
+      if (!chain_matches || rc_validate_is_combining_condition(compare_condition))
+      {
+        while (compare_condition->next && rc_validate_is_combining_condition(compare_condition))
+          compare_condition = compare_condition->next;
+        continue;
       }
 
       if (compare_condition->required_hits)
diff --git a/3rdparty/rcheevos/src/rcheevos/richpresence.c b/3rdparty/rcheevos/src/rcheevos/richpresence.c
index 0dd660e686..81fc56a100 100644
--- a/3rdparty/rcheevos/src/rcheevos/richpresence.c
+++ b/3rdparty/rcheevos/src/rcheevos/richpresence.c
@@ -360,6 +360,9 @@ static const char* rc_parse_richpresence_lookup(rc_richpresence_lookup_t* lookup
   do
   {
     line = nextline;
+    if (line == NULL)
+      break;
+
     nextline = rc_parse_line(line, &endline, parse);
 
     if (endline - line < 2) {
@@ -438,6 +441,9 @@ static const char* rc_parse_richpresence_lookup(rc_richpresence_lookup_t* lookup
 
       /* insert the current item and continue scanning the next one */
       rc_insert_richpresence_lookup_item(lookup, first, last, label, (int)(endline - label), parse);
+      if (parse->offset < 0)
+        break;
+
       line = endptr + 1;
     } while (line < endline);
 
diff --git a/3rdparty/rcheevos/src/rhash/hash.c b/3rdparty/rcheevos/src/rhash/hash.c
index 9fc32f6324..d9ad0eb779 100644
--- a/3rdparty/rcheevos/src/rhash/hash.c
+++ b/3rdparty/rcheevos/src/rhash/hash.c
@@ -3113,6 +3113,7 @@ int rc_hash_generate_from_buffer(char hash[33], uint32_t console_id, const uint8
     case RC_CONSOLE_VIRTUAL_BOY:
     case RC_CONSOLE_WASM4:
     case RC_CONSOLE_WONDERSWAN:
+    case RC_CONSOLE_ZX_SPECTRUM:
       return rc_hash_buffer(hash, buffer, buffer_size);
 
     case RC_CONSOLE_ARDUBOY:
@@ -3411,6 +3412,7 @@ int rc_hash_generate_from_file(char hash[33], uint32_t console_id, const char* p
     case RC_CONSOLE_VIRTUAL_BOY:
     case RC_CONSOLE_WASM4:
     case RC_CONSOLE_WONDERSWAN:
+    case RC_CONSOLE_ZX_SPECTRUM:
       /* generic whole-file hash - don't buffer */
       return rc_hash_whole_file(hash, path);
 
@@ -3466,6 +3468,9 @@ int rc_hash_generate_from_file(char hash[33], uint32_t console_id, const char* p
     case RC_CONSOLE_NINTENDO_64:
       return rc_hash_n64(hash, path);
 
+    case RC_CONSOLE_NINTENDO_3DS:
+      return rc_hash_nintendo_3ds(hash, path);
+
     case RC_CONSOLE_NINTENDO_DS:
     case RC_CONSOLE_NINTENDO_DSI:
       return rc_hash_nintendo_ds(hash, path);
@@ -3573,6 +3578,7 @@ static void rc_hash_initialize_dsk_iterator(struct rc_hash_iterator* iterator, c
   /* check MSX first, as Apple II isn't supported by RetroArch, and RAppleWin won't use the iterator */
   rc_hash_iterator_append_console(iterator, RC_CONSOLE_MSX);
   rc_hash_iterator_append_console(iterator, RC_CONSOLE_AMSTRAD_PC);
+  rc_hash_iterator_append_console(iterator, RC_CONSOLE_ZX_SPECTRUM);
   rc_hash_iterator_append_console(iterator, RC_CONSOLE_APPLE_II);
 }
 
@@ -3725,6 +3731,10 @@ void rc_hash_initialize_iterator(struct rc_hash_iterator* iterator, const char*
         {
           iterator->consoles[0] = RC_CONSOLE_NINTENDO_3DS;
         }
+        else if (rc_path_compare_extension(ext, "csw"))
+        {
+          iterator->consoles[0] = RC_CONSOLE_ZX_SPECTRUM;
+        }
         break;
 
       case 'd':
@@ -3808,6 +3818,7 @@ void rc_hash_initialize_iterator(struct rc_hash_iterator* iterator, const char*
           iterator->consoles[1] = RC_CONSOLE_PSP;
           iterator->consoles[2] = RC_CONSOLE_3DO;
           iterator->consoles[3] = RC_CONSOLE_SEGA_CD; /* ASSERT: handles both Sega CD and Saturn */
+          iterator->consoles[4] = RC_CONSOLE_GAMECUBE;
           need_path = 1;
         }
         break;
@@ -3909,6 +3920,10 @@ void rc_hash_initialize_iterator(struct rc_hash_iterator* iterator, const char*
         {
           iterator->consoles[0] = RC_CONSOLE_ELEKTOR_TV_GAMES_COMPUTER;
         }
+        else if (rc_path_compare_extension(ext, "pzx"))
+        {
+          iterator->consoles[0] = RC_CONSOLE_ZX_SPECTRUM;
+        }
         break;
 
       case 'r':
@@ -3947,11 +3962,16 @@ void rc_hash_initialize_iterator(struct rc_hash_iterator* iterator, const char*
         {
           iterator->consoles[0] = RC_CONSOLE_THOMSONTO8; /* disk */
         }
+        else if (rc_path_compare_extension(ext, "scl"))
+        {
+          iterator->consoles[0] = RC_CONSOLE_ZX_SPECTRUM;
+        }
         break;
 
       case 't':
         if (rc_path_compare_extension(ext, "tap"))
         {
+          /* also Commodore 64 and ZX Spectrum, but all are full file hashes */
           iterator->consoles[0] = RC_CONSOLE_ORIC;
         }
         else if (rc_path_compare_extension(ext, "tic"))
@@ -3962,6 +3982,11 @@ void rc_hash_initialize_iterator(struct rc_hash_iterator* iterator, const char*
         {
           iterator->consoles[0] = RC_CONSOLE_ELEKTOR_TV_GAMES_COMPUTER;
         }
+        else if (rc_path_compare_extension(ext, "trd") ||
+                 rc_path_compare_extension(ext, "tzx"))
+        {
+          iterator->consoles[0] = RC_CONSOLE_ZX_SPECTRUM;
+        }
         break;
 
       case 'u':