diff --git a/client.py b/client.py
index 516745d..a26f832 100644
--- a/client.py
+++ b/client.py
@@ -41,8 +41,6 @@ def symmetric(ser, b):
                 l.extend(res)
             if len(l) + 8 >= i:
                 break
-            else:
-                time.sleep(0.0001)
 
         ser.write(bytes([c]))
 
diff --git a/headers.mk b/headers.mk
index ec34f63..27a82f7 100644
--- a/headers.mk
+++ b/headers.mk
@@ -31,6 +31,9 @@ holly/ta_vertex_parameter.hpp: regs/vertex_parameter_format.csv regs/gen/ta_para
 holly/object_list_data.hpp: regs/object_list.csv regs/gen/core_bits.py
 	python regs/gen/core_bits.py $< object_list_data > $@
 
+holly/video_output_mode.cpp: regs/video_output.csv regs/gen/video_output.py
+	python regs/gen/video_output.py $< > $@
+
 # MAPLE
 
 maple/maple_bus_commands.hpp: regs/maple_bus_commands.csv regs/gen/maple_bus_commands.py
diff --git a/holly/core_bits.hpp b/holly/core_bits.hpp
index fd22958..a85c607 100644
--- a/holly/core_bits.hpp
+++ b/holly/core_bits.hpp
@@ -392,7 +392,7 @@ namespace text_control {
 
 namespace vo_control {
   constexpr uint32_t pclk_delay_reset = 1 << 21;
-  constexpr uint32_t pclk_delay(uint32_t num) { return (num & 0xf) << 16; }
+  constexpr uint32_t pclk_delay(uint32_t num) { return (num & 0x1f) << 16; }
   constexpr uint32_t pixel_double = 1 << 8;
 
   namespace field_mode {
diff --git a/holly/video_output.hpp b/holly/video_output.hpp
new file mode 100644
index 0000000..49d7394
--- /dev/null
+++ b/holly/video_output.hpp
@@ -0,0 +1,19 @@
+#include <cstdint>
+
+namespace video_output {
+
+struct mode {
+  const uint32_t fb_r_ctrl;
+  const uint32_t spg_load;
+  const uint32_t spg_hblank;
+  const uint32_t spg_vblank;
+  const uint32_t spg_width;
+  const uint32_t spg_control;
+  const uint32_t vo_startx;
+  const uint32_t vo_starty;
+  const uint32_t vo_control;
+  const uint32_t spg_hblank_int;
+  const uint32_t spg_vblank_int;
+};
+
+}
diff --git a/holly/video_output_mode.cpp b/holly/video_output_mode.cpp
new file mode 100644
index 0000000..2a7e570
--- /dev/null
+++ b/holly/video_output_mode.cpp
@@ -0,0 +1,177 @@
+#include <cstdint>
+
+#include "core_bits.hpp"
+#include "video_output.hpp"
+
+namespace video_output {
+  const struct mode vga = {
+    .fb_r_ctrl      = fb_r_ctrl::vclk_div::pclk_vclk_1
+                    ,
+    .spg_load       = spg_load::vcount(0x20c)
+                    | spg_load::hcount(0x359)
+                    ,
+    .spg_hblank     = spg_hblank::hbend(0x07e)
+                    | spg_hblank::hbstart(0x345)
+                    ,
+    .spg_vblank     = spg_vblank::vbend(0x028)
+                    | spg_vblank::vbstart(0x208)
+                    ,
+    .spg_width      = spg_width::eqwidth(0x00f)
+                    | spg_width::bpwidth(0x319)
+                    | spg_width::vswidth(0x3)
+                    | spg_width::hswidth(0x3f)
+                    ,
+    .spg_control    = spg_control::sync_direction::output
+                    ,
+    .vo_startx      = vo_startx::horizontal_start_position(0x0a8)
+                    ,
+    .vo_starty      = vo_starty::vertical_start_position_on_field_2(0x028)
+                    | vo_starty::vertical_start_position_on_field_1(0x028)
+                    ,
+    .vo_control     = vo_control::pclk_delay(0x16)
+                    ,
+    .spg_hblank_int = spg_hblank_int::line_comp_val(0x345)
+                    ,
+    .spg_vblank_int = spg_vblank_int::vblank_out_interrupt_line_number(0x015)
+                    | spg_vblank_int::vblank_in_interrupt_line_number(0x208)
+                    ,
+  };
+  const struct mode ntsc_ni = {
+    .fb_r_ctrl      = fb_r_ctrl::vclk_div::pclk_vclk_2
+                    ,
+    .spg_load       = spg_load::vcount(0x106)
+                    | spg_load::hcount(0x359)
+                    ,
+    .spg_hblank     = spg_hblank::hbend(0x07e)
+                    | spg_hblank::hbstart(0x345)
+                    ,
+    .spg_vblank     = spg_vblank::vbend(0x012)
+                    | spg_vblank::vbstart(0x102)
+                    ,
+    .spg_width      = spg_width::eqwidth(0x00f)
+                    | spg_width::bpwidth(0x319)
+                    | spg_width::vswidth(0x3)
+                    | spg_width::hswidth(0x3f)
+                    ,
+    .spg_control    = spg_control::sync_direction::output
+                    | spg_control::ntsc
+                    ,
+    .vo_startx      = vo_startx::horizontal_start_position(0x0a4)
+                    ,
+    .vo_starty      = vo_starty::vertical_start_position_on_field_2(0x012)
+                    | vo_starty::vertical_start_position_on_field_1(0x011)
+                    ,
+    .vo_control     = vo_control::pclk_delay(0x16)
+                    | vo_control::pixel_double
+                    ,
+    .spg_hblank_int = spg_hblank_int::line_comp_val(0x345)
+                    ,
+    .spg_vblank_int = spg_vblank_int::vblank_out_interrupt_line_number(0x015)
+                    | spg_vblank_int::vblank_in_interrupt_line_number(0x102)
+                    ,
+  };
+  const struct mode ntsc_i = {
+    .fb_r_ctrl      = fb_r_ctrl::vclk_div::pclk_vclk_2
+                    ,
+    .spg_load       = spg_load::vcount(0x20c)
+                    | spg_load::hcount(0x359)
+                    ,
+    .spg_hblank     = spg_hblank::hbend(0x07e)
+                    | spg_hblank::hbstart(0x345)
+                    ,
+    .spg_vblank     = spg_vblank::vbend(0x024)
+                    | spg_vblank::vbstart(0x204)
+                    ,
+    .spg_width      = spg_width::eqwidth(0x01f)
+                    | spg_width::bpwidth(0x16c)
+                    | spg_width::vswidth(0x6)
+                    | spg_width::hswidth(0x3f)
+                    ,
+    .spg_control    = spg_control::sync_direction::output
+                    | spg_control::ntsc
+                    | spg_control::interlace
+                    ,
+    .vo_startx      = vo_startx::horizontal_start_position(0x0a4)
+                    ,
+    .vo_starty      = vo_starty::vertical_start_position_on_field_2(0x012)
+                    | vo_starty::vertical_start_position_on_field_1(0x012)
+                    ,
+    .vo_control     = vo_control::pclk_delay(0x16)
+                    | vo_control::pixel_double
+                    ,
+    .spg_hblank_int = spg_hblank_int::line_comp_val(0x345)
+                    ,
+    .spg_vblank_int = spg_vblank_int::vblank_out_interrupt_line_number(0x015)
+                    | spg_vblank_int::vblank_in_interrupt_line_number(0x102)
+                    ,
+  };
+  const struct mode pal_ni = {
+    .fb_r_ctrl      = fb_r_ctrl::vclk_div::pclk_vclk_2
+                    ,
+    .spg_load       = spg_load::vcount(0x138)
+                    | spg_load::hcount(0x35f)
+                    ,
+    .spg_hblank     = spg_hblank::hbend(0x08d)
+                    | spg_hblank::hbstart(0x34b)
+                    ,
+    .spg_vblank     = spg_vblank::vbend(0x016)
+                    | spg_vblank::vbstart(0x134)
+                    ,
+    .spg_width      = spg_width::eqwidth(0x0f)
+                    | spg_width::bpwidth(0x31f)
+                    | spg_width::vswidth(0x3)
+                    | spg_width::hswidth(0x3f)
+                    ,
+    .spg_control    = spg_control::sync_direction::output
+                    | spg_control::pal
+                    ,
+    .vo_startx      = vo_startx::horizontal_start_position(0x0ae)
+                    ,
+    .vo_starty      = vo_starty::vertical_start_position_on_field_2(0x02e)
+                    | vo_starty::vertical_start_position_on_field_1(0x02e)
+                    ,
+    .vo_control     = vo_control::pclk_delay(0x16)
+                    | vo_control::pixel_double
+                    ,
+    .spg_hblank_int = spg_hblank_int::line_comp_val(0x34b)
+                    ,
+    .spg_vblank_int = spg_vblank_int::vblank_out_interrupt_line_number(0x015)
+                    | spg_vblank_int::vblank_in_interrupt_line_number(0x134)
+                    ,
+  };
+  const struct mode pal_i = {
+    .fb_r_ctrl      = fb_r_ctrl::vclk_div::pclk_vclk_2
+                    ,
+    .spg_load       = spg_load::vcount(0x270)
+                    | spg_load::hcount(0x35f)
+                    ,
+    .spg_hblank     = spg_hblank::hbend(0x08d)
+                    | spg_hblank::hbstart(0x34b)
+                    ,
+    .spg_vblank     = spg_vblank::vbend(0x02c)
+                    | spg_vblank::vbstart(0x26c)
+                    ,
+    .spg_width      = spg_width::eqwidth(0x01f)
+                    | spg_width::bpwidth(0x16a)
+                    | spg_width::vswidth(0x5)
+                    | spg_width::hswidth(0x3f)
+                    ,
+    .spg_control    = spg_control::sync_direction::output
+                    | spg_control::pal
+                    | spg_control::interlace
+                    ,
+    .vo_startx      = vo_startx::horizontal_start_position(0x0ae)
+                    ,
+    .vo_starty      = vo_starty::vertical_start_position_on_field_2(0x02e)
+                    | vo_starty::vertical_start_position_on_field_1(0x02d)
+                    ,
+    .vo_control     = vo_control::pclk_delay(0x16)
+                    | vo_control::pixel_double
+                    ,
+    .spg_hblank_int = spg_hblank_int::line_comp_val(0x34b)
+                    ,
+    .spg_vblank_int = spg_vblank_int::vblank_out_interrupt_line_number(0x015)
+                    | spg_vblank_int::vblank_in_interrupt_line_number(0x134)
+                    ,
+  };
+}
diff --git a/regs/core_bits.csv b/regs/core_bits.csv
index dec7246..3c8d0f0 100644
--- a/regs/core_bits.csv
+++ b/regs/core_bits.csv
@@ -207,7 +207,7 @@
 "TEXT_CONTROL",,"4-0","stride",,"0x1f",,,,,,
 ,,,,,,,,,,,
 "VO_CONTROL",,21,"pclk_delay_reset",1,,,,,,,
-"VO_CONTROL",,"20-16","pclk_delay",,"0b1111",,,,,,
+"VO_CONTROL",,"20-16","pclk_delay",,"0b11111",,,,,,
 "VO_CONTROL",,8,"pixel_double",1,,,,,,,
 "VO_CONTROL","field_mode","7-4","use_field_flag_from_spg","0x0",,,,,,,
 "VO_CONTROL","field_mode","7-4","use_inverse_of_field_flag_from_spg","0x1",,,,,,,
diff --git a/regs/core_bits.ods b/regs/core_bits.ods
index 986407c..e026747 100644
Binary files a/regs/core_bits.ods and b/regs/core_bits.ods differ
diff --git a/regs/gen/video_output.py b/regs/gen/video_output.py
new file mode 100644
index 0000000..9099970
--- /dev/null
+++ b/regs/gen/video_output.py
@@ -0,0 +1,147 @@
+from collections import defaultdict
+import sys
+from dataclasses import dataclass
+from generate import renderer
+
+from csv_input import read_input_headerless
+
+def one_bit(register, bit, value):
+    v = int(value, 16)
+    if v == 0:
+        return None
+    elif v == 1:
+        return f"{register}::{bit}"
+    else:
+        assert False, (register, bit, value)
+
+def enum(enums):
+    def do(register, bit, value):
+        v = int(value, 16)
+        return f"{register}::{bit}::{enums[v]}"
+    return do
+
+special = {
+    ("spg_control", "pal"): one_bit,
+    ("spg_control", "ntsc"): one_bit,
+    ("spg_control", "interlace"): one_bit,
+    ("spg_control", "sync_direction"): enum({0: "input", 1: "output"}),
+    ("vo_control", "pixel_double"): one_bit,
+    ("fb_r_ctrl", "vclk_div"): enum({0: "pclk_vclk_2", 1: "pclk_vclk_1"}),
+}
+
+def parse_regs(rows):
+    last_register = None
+    for row in rows:
+        register, bit, *values0 = row
+        if register == "":
+            assert last_register is not None
+            register = last_register
+        last_register = register
+        values = [v for v in values0]
+        yield register, bit, values
+
+@dataclass
+class Bit:
+    name: str
+    value: int
+
+@dataclass
+class Register:
+    name: str
+    bits: list[Bit]
+
+@dataclass
+class Mode:
+    name: str
+    registers: list[Register]
+
+def group_by_register(regs):
+    by_register = defaultdict(list)
+    register_names = []
+    for register, bit, value in regs:
+        if register not in register_names:
+            register_names.append(register)
+        by_register[register].append(Bit(
+            name=bit.lower(),
+            value=value
+        ))
+
+    return [
+        Register(
+            name=register.lower(),
+            bits=by_register[register]
+        )
+        for register in register_names
+    ]
+
+def transpose_by_name(format_names, regs):
+    by_name = defaultdict(list)
+    for register, bit, values in regs:
+        assert len(values) == len(format_names)
+        for name, value in zip(format_names, values):
+            by_name[name].append((register, bit, value))
+    return [
+        Mode(
+            name=name,
+            registers=group_by_register(by_name[name])
+        )
+        for name in format_names
+    ]
+
+def render_bit(register, bit, value):
+    if (register, bit) in special:
+        return special[(register, bit)](register, bit, value)
+    else:
+        return f"{register}::{bit}(0x{value})"
+
+def render_mode(mode, max_len):
+    for register in mode.registers:
+        i_out = 0
+        for bit in register.bits:
+            lhs = f".{register.name}" if i_out == 0 else ""
+            sym = '=' if i_out == 0 else "|"
+            _render_bit = render_bit(register.name, bit.name, bit.value)
+            if _render_bit is not None:
+                i_out += 1
+                yield f"{lhs.ljust(max_len)} {sym} {_render_bit}"
+
+        yield f"{''.ljust(max_len)} ,"
+
+
+def render_modes(modes, max_len):
+    for mode in modes:
+        yield f"const struct mode {mode.name.lower()} = {{"
+        yield from render_mode(mode, max_len)
+        yield "};"
+
+def render_namespace(modes, max_len):
+    yield "namespace video_output {"
+    yield from render_modes(modes, max_len)
+    yield "}"
+
+def render_header():
+    yield "#include <cstdint>"
+    yield ""
+    yield '#include "core_bits.hpp"'
+    yield '#include "video_output.hpp"'
+    yield ""
+
+def max_length(regs):
+    max_length = 0
+    for register, *_ in regs:
+        if len(register) > max_length:
+            max_length = len(register)
+    return max_length + 1
+
+if __name__ == "__main__":
+    rows = read_input_headerless(sys.argv[1])
+    formats0, *regs0 = rows
+    b0, b1, *format_names = formats0
+    assert (b0, b1) == ("", ""), (b0, b1)
+    regs = list(parse_regs(regs0))
+    modes = transpose_by_name(format_names, regs)
+    max_length = max_length(regs)
+    render, out = renderer()
+    render(render_header())
+    render(render_namespace(modes, max_length))
+    sys.stdout.write(out.getvalue())
diff --git a/regs/video_output.csv b/regs/video_output.csv
new file mode 100644
index 0000000..4108b8c
--- /dev/null
+++ b/regs/video_output.csv
@@ -0,0 +1,24 @@
+,,"VGA","NTSC_NI","NTSC_I","PAL_NI","PAL_I"
+"FB_R_CTRL","vclk_div","1",0,0,0,0
+"SPG_LOAD","vcount","20c",106,"20c",138,270
+,"hcount","359","359","359","35f","35f"
+"SPG_HBLANK","hbend","07e","07e","07e","08d","08d"
+,"hbstart","345","345",345,"34b","34b"
+"SPG_VBLANK","vbend","028","012","024","016","02c"
+,"vbstart","208","102","204","134","26c"
+"SPG_WIDTH","eqwidth","00f","00f","01f","0f","01f"
+,"bpwidth","319","319","16c","31f","16a"
+,"vswidth","3","3","6","3","5"
+,"hswidth","3f","3f","3f","3f","3f"
+"SPG_CONTROL","sync_direction","1","1","1","1","1"
+,"pal","0","0","0","1","1"
+,"ntsc","0","1","1","0","0"
+,"interlace","0","0","1","0","1"
+"VO_STARTX","horizontal_start_position","0a8","0a4","0a4","0ae","0ae"
+"VO_STARTY","vertical_start_position_on_field_2","028","012","012","02e","02e"
+,"vertical_start_position_on_field_1","028","011","012","02e","02d"
+"VO_CONTROL","pclk_delay","16","16","16","16","16"
+,"pixel_double","0","1","1","1","1"
+"SPG_HBLANK_INT","line_comp_val","345","345","345","34b","34b"
+"SPG_VBLANK_INT","vblank_out_interrupt_line_number","015","015","015","015","015"
+,"vblank_in_interrupt_line_number","208","102","102","134","134"
diff --git a/regs/video_output.ods b/regs/video_output.ods
new file mode 100644
index 0000000..988b53f
Binary files /dev/null and b/regs/video_output.ods differ