diff --git a/rtl/huc6272_bgm.sv b/rtl/huc6272_bgm.sv
index e265ec9..2b82646 100644
--- a/rtl/huc6272_bgm.sv
+++ b/rtl/huc6272_bgm.sv
@@ -77,8 +77,11 @@ always @(posedge CLK) begin
     end
 end
 
+// Use U/V=128, because yuv2rgb converts all zeros to green.
+localparam [23:0] PD_BLACK = {8'd0, 8'd128, 8'd128};
+
 always @* begin
-    cgpd = '0;
+    cgpd = PD_BLACK;
     if (RENDER) begin
         if (format_clr_16m) begin
             // 16M CG is ordered in KRAM as {Y0,Y1,U,V}.
@@ -90,7 +93,7 @@ end
 
 always @(posedge CLK) begin
     if (~RESn) begin
-        cgpdo <= '0;
+        cgpdo <= PD_BLACK;
         cgpdeo <= '0;
     end
     else if (cgrce) begin
diff --git a/rtl/tb/pcfx_top_tb.sv b/rtl/tb/pcfx_top_tb.sv
index ffb677d..04efd89 100644
--- a/rtl/tb/pcfx_top_tb.sv
+++ b/rtl/tb/pcfx_top_tb.sv
@@ -28,7 +28,7 @@ initial begin
     $dumpfile("pcfx_top_tb.vcd");
     $dumpvars();
 `else
-    #(222e3) $dumpfile("pcfx_top_tb.verilator.fst");
+    #(215e3) $dumpfile("pcfx_top_tb.verilator.fst");
     $dumpvars();
 `endif
 end
@@ -513,7 +513,7 @@ end
 initial begin
     @(running) ;
     //repeat (4) #(1000e3) ;
-    #(300e3) ;
+    #(230e3) ;
 
 `ifdef SAVE_SRAMS
     if (bk_ena) begin
diff --git a/rtl/tb/pcfx_top_tb.verilator.gtkw b/rtl/tb/pcfx_top_tb.verilator.gtkw
index 3604f6d..62e93dc 100644
--- a/rtl/tb/pcfx_top_tb.verilator.gtkw
+++ b/rtl/tb/pcfx_top_tb.verilator.gtkw
@@ -1,12 +1,12 @@
 [*]
 [*] GTKWave Analyzer v4.0.0-prealpha (8ba24ab+) (w)1999-2022 BSI
-[*] Wed Apr 15 04:23:59 2026
+[*] Sun Apr 26 06:12:22 2026
 [*]
 [dumpfile] "/Users/dhunter/src/mister/PCFX_MiSTer/rtl/tb/pcfx_top_tb.verilator.fst"
-[dumpfile_mtime] "Wed Apr 15 03:57:18 2026"
-[dumpfile_size] 52875093
+[dumpfile_mtime] "Sun Apr 26 06:09:47 2026"
+[dumpfile_size] 8279202
 [savefile] "/Users/dhunter/src/mister/PCFX_MiSTer/rtl/tb/pcfx_top_tb.verilator.gtkw"
-[timestart] 248156930
+[timestart] 215000000
 [size] 1334 601
 [pos] -1 -1
 *-11.858119 248168920 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
@@ -83,6 +83,7 @@ pcfx_top_tb.pcfx_top.bk_sdrd_din[31:0]
 pcfx_top_tb.pcfx_top.bk_sdrd_dout[31:0]
 pcfx_top_tb.pcfx_top.sdbuf_a[7:0]
 pcfx_top_tb.pcfx_top.sdbuf_din[15:0]
+@23
 pcfx_top_tb.pcfx_top.sdbuf_dout[15:0]
 @28
 pcfx_top_tb.pcfx_top.sdbuf_rden
@@ -91,7 +92,7 @@ pcfx_top_tb.pcfx_top.bmp_rom_inserted
 @22
 pcfx_top_tb.pcfx_top.bmp_ioctl_blk_cnt[31:0]
 pcfx_top_tb.pcfx_top.bmp_sd_blk_cnt[31:0]
-@1001200
+@1000200
 -pcfx_top
 @800200
 -sdram
@@ -102,7 +103,7 @@ pcfx_top_tb.pcfx_top.sdram.ch2_req
 pcfx_top_tb.pcfx_top.sdram.ch2_ready
 pcfx_top_tb.pcfx_top.sdram.ch3_req
 pcfx_top_tb.pcfx_top.sdram.ch3_ready
-@23
+@22
 pcfx_top_tb.pcfx_top.sdram.refresh_wait[3:0]
 @1000200
 -sdram