diff --git a/arch/brother/pn8800/build.py b/arch/brother/pn8800/build.py
new file mode 100644
index 0000000..b517588
--- /dev/null
+++ b/arch/brother/pn8800/build.py
@@ -0,0 +1,142 @@
+from build.ab import simplerule
+from build.cpm import cpm_addresses, binslice, diskimage
+from utils.build import unix2cpm
+from third_party.zmac.build import zmac
+from third_party.ld80.build import ld80
+
+# Memory layout configuration -----------------------------------------------
+
+# Configure the BIOS size here; this will then emit an addresses.lib file
+# which contains the position of the BDOS and CCP.
+
+top_of_memory = 0x10000
+(cbase, fbase, bbase) = cpm_addresses(
+    name="addresses", top_of_memory=top_of_memory, bios_size=0x0900
+)
+
+# Generated tables ----------------------------------------------------------
+
+simplerule(
+    name="keytab_inc",
+    ins=["arch/brother/pn8800/utils+mkkeytab"],
+    outs=["=keytab.inc"],
+    commands=["{ins[0]} > {outs[0]}"],
+    label="MKKEYTAB"
+)
+
+# Object files --------------------------------------------------------------
+
+BIOS_SRCS = [
+    "boot",
+    "hd63266",
+    "bios",
+    "floppy",
+    "tty",
+    "keyboard",
+]
+
+for name in BIOS_SRCS:
+    zmac(
+        name=name + "_o",
+        z180=True,
+        src=f"./{name}.z80",
+        deps=[
+            ".+addresses",
+            ".+keytab_inc",
+            "arch/brother/pn8800/include/pn8800.lib",
+            "arch/common/utils/print.lib",
+            "arch/common/utils/tty.lib",
+            "include/cpm.lib",
+            "include/cpmish.lib",
+            "include/z180.lib",
+        ],
+    )
+
+# Bootstrapper --------------------------------------------------------------
+
+# This is the .APL file which the Brother OS loads. It's responsible for
+# remapping the memory, doing some device setup, and loading the BIOS into
+# the top of memory.
+
+ld80(name="boot_img", address=0x8000, objs={0: [".+boot_o", ".+hd63266_o"]})
+
+# BIOS ----------------------------------------------------------------------
+
+# The CP/M BIOS itself.
+
+# This is a 64kB file containing the entire CP/M memory image.
+
+ld80(
+    name="memory_img",
+    address=0,
+    objs={
+        cbase: ["third_party/zcpr1"],
+        fbase: ["third_party/zsdos"],
+        bbase: [
+            ".+bios_o",
+            ".+hd63266_o",
+            ".+tty_o",
+            ".+floppy_o",
+            ".+keyboard_o",
+        ],
+    },
+)
+
+# Currently only used for debugging.
+binslice(
+    name="bios_img", src=".+memory_img", start=bbase, length=0x10000 - bbase
+)
+
+binslice(
+    name="systemtrack_img",
+    src=".+memory_img",
+    start=cbase,
+    length=0x10000 - cbase,
+)
+
+# FAT file system -----------------------------------------------------------
+
+# Produces the FAT bit of the disk image.
+
+zmac(
+    name="bootfile_img",
+    src="./fat.z80",
+    deps=[
+        "./fat.z80",
+        ".+boot_img",
+        ".+systemtrack_img",
+    ],
+    relocatable=False,
+    z180=True,
+)
+
+# Disk image ----------------------------------------------------------------
+
+# Assembles the bootable disk which you can actually run.
+
+unix2cpm(name="readme", src="README.md")
+
+diskimage(
+    name="diskimage",
+    format="brother-powernote",
+    bootfile=".+bootfile_img",
+    size=1440 * 1024,
+    map={
+        "-readme.txt": ".+readme",
+        "dump.com": "cpmtools+dump",
+        "stat.com": "cpmtools+stat",
+        "asm.com": "cpmtools+asm",
+        "copy.com": "cpmtools+copy",
+        "submit.com": "cpmtools+submit",
+        "asm80.com": "third_party/dr/asm80",
+        "camel80.com": "third_party/camelforth",
+        "bbcbasic.com": "third_party/bbcbasic+bbcbasic_ADM3A",
+        "mkfs.com": "cpmtools+mkfs",
+        "rawdisk.com": "cpmtools+rawdisk",
+        "qe.com": "cpmtools+qe_BROTHER_POWERNOTE",
+        "z8e.com": "third_party/z8e+z8e_POWERNOTE",
+        "ted.com": "third_party/ted+ted_POWERNOTE",
+    },
+)
+
+# vim: ts=4 sw=4 et
diff --git a/arch/brother/pn8800/utils/build.py b/arch/brother/pn8800/utils/build.py
new file mode 100644
index 0000000..deeb637
--- /dev/null
+++ b/arch/brother/pn8800/utils/build.py
@@ -0,0 +1,3 @@
+from build.c import cprogram
+
+cprogram(name="mkkeytab", srcs=["./mkkeytab.c"])
diff --git a/build.py b/build.py
index 67625ba..f18ffc1 100644
--- a/build.py
+++ b/build.py
@@ -3,5 +3,7 @@
 export(
     name="all",
     items={
-        "pn8510.img": "arch/brother/pn8510+diskimage"
-        })
+        "pn8510.img": "arch/brother/pn8510+diskimage",
+        "pn8800.img": "arch/brother/pn8800+diskimage",
+    },
+)
diff --git a/third_party/dr/asm80/build.py b/third_party/dr/asm80/build.py
index 4786e86..4dc2bc7 100644
--- a/third_party/dr/asm80/build.py
+++ b/third_party/dr/asm80/build.py
@@ -11,5 +11,5 @@
     ins=[".+" + f for f in SRCS],
     outs=["=asm80.com"],
     commands=["cat {ins[0]} > {outs[0]}"],
-    label="CAT"
+    label="CAT",
 )