diff --git a/src/BRSRC13/CORE/FW/fwsetup.c b/src/BRSRC13/CORE/FW/fwsetup.c
index cea2acef..96ee4691 100644
--- a/src/BRSRC13/CORE/FW/fwsetup.c
+++ b/src/BRSRC13/CORE/FW/fwsetup.c
@@ -123,7 +123,13 @@ br_diaghandler* BrDiagHandlerSet(br_diaghandler* newdh) {
 // Size: 73
 br_filesystem* BrFilesystemSet(br_filesystem* newfs) {
     br_filesystem* old;
-    NOT_IMPLEMENTED();
+
+    old = fw.fsys;
+    if (!newfs) {
+        newfs = _BrDefaultFilesystem;
+    }
+    fw.fsys = newfs;
+    return old;
 }
 
 // Offset: 643
diff --git a/src/BRSRC13/CORE/FW/tokenval.c b/src/BRSRC13/CORE/FW/tokenval.c
index d9801e29..a1a908f6 100644
--- a/src/BRSRC13/CORE/FW/tokenval.c
+++ b/src/BRSRC13/CORE/FW/tokenval.c
@@ -184,7 +184,7 @@ br_error BrTokenValueSetMany(void* mem, br_int_32* pcount, br_uint_32* pcombined
     br_int_32 n;
     br_error r;
     br_uint_32 cm;
-    NOT_IMPLEMENTED();
+    LOG_WARN("Not implemented");
 }
 
 // Offset: 6409
diff --git a/src/BRSRC13/CORE/PIXELMAP/pmmem.c b/src/BRSRC13/CORE/PIXELMAP/pmmem.c
index d130e7b8..7ad9f108 100644
--- a/src/BRSRC13/CORE/PIXELMAP/pmmem.c
+++ b/src/BRSRC13/CORE/PIXELMAP/pmmem.c
@@ -168,7 +168,6 @@ void CheckDispatch(br_device_pixelmap* pm) {
     // if (!pm->dispatch) {
     //     pm->dispatch = &devicePixelmapDispatch;
     // }
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 631
diff --git a/src/BRSRC13/CORE/V1DB/dbsetup.c b/src/BRSRC13/CORE/V1DB/dbsetup.c
index 645e07f0..b8f21445 100644
--- a/src/BRSRC13/CORE/V1DB/dbsetup.c
+++ b/src/BRSRC13/CORE/V1DB/dbsetup.c
@@ -147,7 +147,7 @@ br_error BrV1dbRendererEnd() {
 // Size: 94
 void BrZbBegin(br_uint_8 colour_type, br_uint_8 depth_type) {
     LOG_TRACE("(%d, %d)", colour_type, depth_type);
-    NOT_IMPLEMENTED();
+    LOG_WARN("Not implemented");
 }
 
 // Offset: 2133
diff --git a/src/BRSRC13/CORE/V1DB/regsupt.c b/src/BRSRC13/CORE/V1DB/regsupt.c
index 9767dfef..2b34fd45 100644
--- a/src/BRSRC13/CORE/V1DB/regsupt.c
+++ b/src/BRSRC13/CORE/V1DB/regsupt.c
@@ -1,6 +1,8 @@
 #include "regsupt.h"
 #include "CORE/FW/register.h"
 #include "CORE/V1DB/dbsetup.h"
+#include "CORE/V1DB/prepmesh.h"
+
 #include "debug.h"
 
 char rscid[51];
@@ -8,7 +10,9 @@ char rscid[51];
 // Offset: 11
 // Size: 148
 br_model* BrModelAdd(br_model* model) {
-    NOT_IMPLEMENTED();
+    BrRegistryAdd(&v1db.reg_models, model);
+    BrModelUpdate(model, 0x7FFF);
+    return model;
 }
 
 // Offset: 173
diff --git a/src/BRSRC13/brender.h b/src/BRSRC13/brender.h
index 25aad8af..158f4496 100644
--- a/src/BRSRC13/brender.h
+++ b/src/BRSRC13/brender.h
@@ -1,5 +1,9 @@
+// This is a temporary solution to avoid userland (dethrace) code from having to understand brender internal paths.
+// Probably should end up just being a bunch of function prototypes.
+
 #include "CORE/DOSIO/dosio.h"
 #include "CORE/FW/fwsetup.h"
+#include "CORE/FW/mem.h"
 #include "CORE/FW/resource.h"
 #include "CORE/FW/resreg.h"
 #include "CORE/MATH/matrix34.h"
diff --git a/src/DETHRACE/common/brucetrk.c b/src/DETHRACE/common/brucetrk.c
index c8d509b8..51a08f93 100644
--- a/src/DETHRACE/common/brucetrk.c
+++ b/src/DETHRACE/common/brucetrk.c
@@ -156,12 +156,10 @@ void RenderTrack(br_actor* pWorld, tTrack_spec* pTrack_spec, br_actor* pCamera,
 // Size: 47
 br_scalar GetYonFactor() {
     return gYon_factor;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 6248
 // Size: 44
 void SetYonFactor(br_scalar pNew) {
     gYon_factor = pNew;
-    NOT_IMPLEMENTED();
 }
diff --git a/src/DETHRACE/common/controls.c b/src/DETHRACE/common/controls.c
index a28617ef..26825acb 100644
--- a/src/DETHRACE/common/controls.c
+++ b/src/DETHRACE/common/controls.c
@@ -820,7 +820,6 @@ void CycleYonFactor() {
 void SetSoundDetailLevel(int pLevel) {
     LOG_TRACE("(%d)", pLevel);
     gSound_detail_level = pLevel;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 17256
diff --git a/src/DETHRACE/common/depth.c b/src/DETHRACE/common/depth.c
index 760530f9..6e6d0937 100644
--- a/src/DETHRACE/common/depth.c
+++ b/src/DETHRACE/common/depth.c
@@ -493,7 +493,6 @@ void SetDepthCueingOn(int pOn) {
         gSwap_depth_effect_end = gProgram_state.current_depth_effect.end;
     }
     gDepth_cueing_on = pOn;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 10864
diff --git a/src/DETHRACE/common/drfile.c b/src/DETHRACE/common/drfile.c
index 3058e2c5..34fa4e92 100644
--- a/src/DETHRACE/common/drfile.c
+++ b/src/DETHRACE/common/drfile.c
@@ -1,43 +1,77 @@
 #include "drfile.h"
+#include "brender.h"
+#include "loading.h"
 #include <stdlib.h>
 
 br_filesystem* gOld_file_system;
-br_filesystem gFilesystem;
+br_filesystem gFilesystem = {
+    "Carmageddon",
+    NULL,
+    &DRStdioOpenRead,
+    &DRStdioOpenWrite,
+    &DRStdioClose,
+    NULL,
+    NULL,
+    NULL,
+    &DRStdioRead,
+    &DRStdioWrite,
+    NULL,
+    NULL,
+    NULL
+};
+
+// Added by JeffH
+#define DR_MEMORY_FILESYSTEM 140
 
 // Offset: 0
 // Size: 64
 void* DRStdioOpenRead(char* name, br_size_t n_magics, br_mode_test_cbfn* identify, int* mode_result) {
-    NOT_IMPLEMENTED();
+    if (mode_result) {
+        *mode_result = 0;
+    }
+    return DRfopen(name, "rb");
 }
 
 // Offset: 64
 // Size: 56
 void* DRStdioOpenWrite(char* name, int mode) {
-    NOT_IMPLEMENTED();
+    return gOld_file_system->open_write(name, mode);
 }
 
 // Offset: 120
 // Size: 46
 void DRStdioClose(void* f) {
-    NOT_IMPLEMENTED();
+    gOld_file_system->close(f);
 }
 
 // Offset: 168
 // Size: 70
 br_size_t DRStdioRead(void* buf, br_size_t size, unsigned int n, void* f) {
     br_size_t result;
-    NOT_IMPLEMENTED();
+    return gOld_file_system->read(buf, size, n, f);
 }
 
 // Offset: 240
 // Size: 70
 br_size_t DRStdioWrite(void* buf, br_size_t size, unsigned int n, void* f) {
     br_size_t result;
-    NOT_IMPLEMENTED();
+    return gOld_file_system->write(buf, size, n, f);
 }
 
 // Offset: 312
 // Size: 187
 void InstallDRFileCalls() {
-    NOT_IMPLEMENTED();
+    br_filesystem* temp_system;
+    LOG_TRACE("()");
+    temp_system = BrMemAllocate(sizeof(br_filesystem), DR_MEMORY_FILESYSTEM);
+    gOld_file_system = BrFilesystemSet(temp_system);
+    gFilesystem.attributes = gOld_file_system->attributes;
+    gFilesystem.eof = gOld_file_system->eof;
+    gFilesystem.getchr = gOld_file_system->getchr;
+    gFilesystem.putchr = gOld_file_system->putchr;
+    gFilesystem.getline = gOld_file_system->getline;
+    gFilesystem.putline = gOld_file_system->putline;
+    gFilesystem.advance = gOld_file_system->advance;
+    BrFilesystemSet(&gFilesystem);
+    BrMemFree(temp_system);
 }
diff --git a/src/DETHRACE/common/drmem.c b/src/DETHRACE/common/drmem.c
index 2e64316e..4eae5fb2 100644
--- a/src/DETHRACE/common/drmem.c
+++ b/src/DETHRACE/common/drmem.c
@@ -314,28 +314,24 @@ void* DRStdlibAllocate(br_size_t size, br_uint_8 type) {
 void DRStdlibFree(void* mem) {
     int i;
     free(mem);
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 444
 // Size: 40
 br_size_t DRStdlibInquire(br_uint_8 type) {
     return 0;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 484
 // Size: 40
 br_uint_32 Claim4ByteAlignment(br_uint_8 type) {
     return 4;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 524
 // Size: 48
 void InstallDRMemCalls() {
     BrAllocatorSet(&gAllocator);
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 572
diff --git a/src/DETHRACE/common/graphics.c b/src/DETHRACE/common/graphics.c
index 2d825fab..3d7f7d17 100644
--- a/src/DETHRACE/common/graphics.c
+++ b/src/DETHRACE/common/graphics.c
@@ -268,7 +268,7 @@ void CopyStripImage(br_pixelmap* pDest, br_int_16 pDest_x, br_int_16 pOffset_x,
 void SetBRenderScreenAndBuffers(int pX_offset, int pY_offset, int pWidth, int pHeight) {
     LOG_TRACE("(%d, %d, %d, %d)", pX_offset, pY_offset, pWidth, pHeight);
 
-    PDInitScreen();
+    PDAllocateScreenAndBack();
     if (!pWidth) {
         pWidth = gBack_screen->width;
     }
@@ -1164,7 +1164,6 @@ void TellyOutImage(br_pixelmap* pImage, int pLeft, int pTop) {
 void SetShadowLevel(tShadow_level pLevel) {
     LOG_TRACE("(%d)", pLevel);
     gShadow_level = pLevel;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 30520
diff --git a/src/DETHRACE/common/init.c b/src/DETHRACE/common/init.c
index 0fda0610..1a65afe7 100644
--- a/src/DETHRACE/common/init.c
+++ b/src/DETHRACE/common/init.c
@@ -363,5 +363,4 @@ int GetScreenSize() {
 void SetScreenSize(int pNew_size) {
     LOG_TRACE("(%d)", pNew_size);
     gRender_indent = pNew_size;
-    NOT_IMPLEMENTED();
 }
diff --git a/src/DETHRACE/common/netgame.c b/src/DETHRACE/common/netgame.c
index 32724c6c..9760e0e7 100644
--- a/src/DETHRACE/common/netgame.c
+++ b/src/DETHRACE/common/netgame.c
@@ -436,7 +436,6 @@ void InitNetGameplayStuff() {
 // Size: 49
 void DefaultNetName() {
     NetObtainSystemUserName(gNet_player_name, 32);
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 19160
diff --git a/src/DETHRACE/common/network.c b/src/DETHRACE/common/network.c
index 1e2747f6..664bfd8c 100644
--- a/src/DETHRACE/common/network.c
+++ b/src/DETHRACE/common/network.c
@@ -295,7 +295,6 @@ int NetJoinGame(tNet_game_details* pDetails, char* pPlayer_name, int pCar_index)
 void NetObtainSystemUserName(char* pName, int pMax_length) {
     PDNetObtainSystemUserName(pName, pMax_length);
     pName[9] = 0;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 5668
diff --git a/src/DETHRACE/common/newgame.c b/src/DETHRACE/common/newgame.c
index afcbbeeb..7db19bd3 100644
--- a/src/DETHRACE/common/newgame.c
+++ b/src/DETHRACE/common/newgame.c
@@ -396,7 +396,7 @@ void RevertToDefaults() {
 void DefaultNetSettings() {
     FILE* f;
     int i;
-    NOT_IMPLEMENTED();
+    LOG_WARN("Not implemented");
 }
 
 // Offset: 7964
diff --git a/src/DETHRACE/common/spark.c b/src/DETHRACE/common/spark.c
index cdafa19a..6f369d06 100644
--- a/src/DETHRACE/common/spark.c
+++ b/src/DETHRACE/common/spark.c
@@ -705,7 +705,6 @@ void ResetSmokeColumns() {
 void SetSmokeOn(int pSmoke_on) {
     LOG_TRACE("(%d)", pSmoke_on);
     gSmoke_on = pSmoke_on;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 32060
diff --git a/src/DETHRACE/common/world.c b/src/DETHRACE/common/world.c
index 960ee1c4..c63b147e 100644
--- a/src/DETHRACE/common/world.c
+++ b/src/DETHRACE/common/world.c
@@ -986,7 +986,6 @@ br_material* WallLinearToPersp(br_model* pModel, tU16 pFace) {
 // Size: 45
 tRoad_texturing_level GetRoadTexturingLevel() {
     return gRoad_texturing_level;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 22220
@@ -995,7 +994,6 @@ tRoad_texturing_level GetRoadTexturingLevel() {
 void SetRoadTexturingLevel(tRoad_texturing_level pLevel) {
     LOG_TRACE("(%d)", pLevel);
     gRoad_texturing_level = pLevel;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 22268
@@ -1017,7 +1015,6 @@ tWall_texturing_level GetWallTexturingLevel() {
 void SetWallTexturingLevel(tWall_texturing_level pLevel) {
     LOG_TRACE("(%d)", pLevel);
     gWall_texturing_level = pLevel;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 22452
@@ -1055,7 +1052,6 @@ br_uint_32 SetAccessoryRenderingCB(br_actor* pActor, void* pFlag) {
         pActor->render_style = *(br_uint_8*)pFlag;
     }
     return 0;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 23076
@@ -1089,7 +1085,6 @@ int GetAccessoryRendering() {
 void SetCarSimplificationLevel(int pLevel) {
     LOG_TRACE("(%d)", pLevel);
     gCar_simplification_level = pLevel;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 23272
diff --git a/src/DETHRACE/pc-dos/dosnet.c b/src/DETHRACE/pc-dos/dosnet.c
index 87f03ae5..24472734 100644
--- a/src/DETHRACE/pc-dos/dosnet.c
+++ b/src/DETHRACE/pc-dos/dosnet.c
@@ -396,7 +396,6 @@ tPlayer_ID PDNetExtractPlayerID(tNet_game_details* pDetails) {
 void PDNetObtainSystemUserName(char* pName, int pMax_length) {
     DrDebugMessage("PDNetObtainSystemUserName()\n");
     strcpy(pName, "Ron Turn");
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 7736
diff --git a/src/DETHRACE/pc-dos/dossys.c b/src/DETHRACE/pc-dos/dossys.c
index f58d4422..c9b872ae 100644
--- a/src/DETHRACE/pc-dos/dossys.c
+++ b/src/DETHRACE/pc-dos/dossys.c
@@ -313,23 +313,11 @@ int PDInitScreenVars(int pArgc, char** pArgv) {
     gGraf_specs[gGraf_spec_index].phys_width = gGraf_specs[gGraf_spec_index].total_width;
     gGraf_specs[gGraf_spec_index].phys_height = gGraf_specs[gGraf_spec_index].total_height;
     return 1;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 3300
 // Size: 24
 void PDInitScreen() {
-    gScreen = DOSGfxBegin(gGraf_specs[gGraf_spec_index].gfx_init_string);
-    gScreen->origin_x = 0;
-    gDOSGfx_initialized = 1;
-    gScreen->origin_y = 0;
-    gBack_screen = BrPixelmapMatch(gScreen, BR_PMMATCH_OFFSCREEN);
-    gBack_screen->origin_x = 0;
-    gBack_screen->origin_y = 0;
-    gTemp_screen = BrPixelmapMatch(gScreen, BR_PMMATCH_OFFSCREEN);
-    gTemp_screen->origin_x = 0;
-    gTemp_screen->origin_y = 0;
-    NOT_IMPLEMENTED();
 }
 
 // Offset: 3324
@@ -347,7 +335,16 @@ void PDUnlockRealBackScreen() {
 // Offset: 3488
 // Size: 431
 void PDAllocateScreenAndBack() {
-    NOT_IMPLEMENTED();
+    gScreen = DOSGfxBegin(gGraf_specs[gGraf_spec_index].gfx_init_string);
+    gScreen->origin_x = 0;
+    gDOSGfx_initialized = 1;
+    gScreen->origin_y = 0;
+    gBack_screen = BrPixelmapMatch(gScreen, BR_PMMATCH_OFFSCREEN);
+    gBack_screen->origin_x = 0;
+    gBack_screen->origin_y = 0;
+    gTemp_screen = BrPixelmapMatch(gScreen, BR_PMMATCH_OFFSCREEN);
+    gTemp_screen->origin_x = 0;
+    gTemp_screen->origin_y = 0;
 }
 
 // Offset: 3920