diff --git a/modules/src/em_data/build.lua b/modules/src/em_data/build.lua
index aa4e8adcd..2425655ae 100644
--- a/modules/src/em_data/build.lua
+++ b/modules/src/em_data/build.lua
@@ -1,26 +1,33 @@
-local generated = normalrule {
-	name = "generated",
-	ins = {
-		"./new_table",
-		"util/cmisc+ed",
-		"h/em_table", -- relative to root, which is a bit evil
-	},
-	outleaves = {
-		"em_flag.c",
-		"em_pseu.c",
-		"em_mnem.c",
-		"em_spec.h",
-		"em_pseu.h",
-		"em_mnem.h",
-	},
-	deps = {
-		"h+emheaders"
-	},
-	commands = {
-		"%{ins[1]} %{ins[2]} %{ins[3]} %{dir} %{dir}",
-	}
+local GENFILES = {
+	"flag.c",
+	"mnem.c",
+	"mnem.h",
+	"pseu.c",
+	"pseu.h",
+	"spec.h"
 }
 
+local generated = {}
+for _, f in ipairs(GENFILES) do
+	generated[#generated+1] = normalrule {
+		name = "em_"..f:gsub("%.", "_"),
+		ins = {
+			"./make_"..f:gsub("%.", "_")..".lua",
+			"./em_table_lib.lua",
+			"h/em_table", -- relative to root, which is a bit evil
+		},
+		outleaves = {
+			"em_"..f
+		},
+		deps = {
+			"h+emheaders"
+		},
+		commands = {
+			"$LUA %{ins[1]} < %{ins[3]} > %{outs}"
+		}
+	}
+end
+
 clibrary {
 	name = "lib",
 	srcs = concat(
@@ -28,10 +35,10 @@ clibrary {
 		matching(filenamesof(generated), "%.c$")
 	),
 	hdrs = {
-		"+generated" -- so we export the H files
+		generated, -- so we export the H files
 	},
 	deps = {
-		"+generated", -- so we can see the H files
+		generated, -- so we can see the H files
 		"h+emheaders"
 	}
 }
diff --git a/modules/src/em_data/em_table_lib.lua b/modules/src/em_data/em_table_lib.lua
new file mode 100644
index 000000000..e43a9dee4
--- /dev/null
+++ b/modules/src/em_data/em_table_lib.lua
@@ -0,0 +1,88 @@
+local function strip(s)
+	return s:match("^%s*(.-)%s*$")
+end
+
+function load_table()
+	local specs = {}
+	for line in io.lines() do
+		line = strip(line)
+		if line == "" then
+			break
+		end
+
+		local _, _, name, num = line:find("^(%w+)%s+(%d+)$")
+		if not name then
+			error("malformed spec line in em_table")
+		end
+
+		specs[#specs+1] = {
+			name = name,
+			num = tonumber(num)
+		}
+	end
+
+	for _, v in ipairs(specs) do
+		specs[v.name] = v
+	end
+
+	local pseudos = {}
+	local pseudo_count = 0
+	for line in io.lines() do
+		line = strip(line)
+		if line == "" then
+			break
+		end
+
+		local _, _, name, num, flags = line:find("^(%w+)%s+(%d+)%s+(%g+)$")
+		if not name then
+			error("malformed pseudo line in em_table")
+		end
+
+		pseudos[#pseudos+1] = {
+			name = name,
+			num = tonumber(num) + specs.fpseu.num,
+			flags = flags
+		}
+		pseudo_count = pseudo_count + 1
+	end
+
+	local mnems = {}
+	local mnem_count = 0
+	for line in io.lines() do
+		line = strip(line)
+		if line == "" then
+			break
+		end
+
+		local _, _, name, flags1, flags2 = line:find("^(%w+)%s+(%g+)%s+(%g+)$")
+		if not name then
+			error("malformed mnemonic line in em_table")
+		end
+
+		mnem_count = mnem_count + 1
+		mnems[#mnems+1] = {
+			name = name,
+			num = mnem_count,
+			flags1 = flags1,
+			flags2 = flags2
+		}
+	end
+
+	local lpseu = {
+		name = "lpseu",
+		num = specs.fpseu.num + pseudo_count - 1
+	}
+	local lmnem = {
+		name = "lmnem",
+		num = specs.fmnem.num + mnem_count - 1
+	}
+
+	specs[#specs+1] = lpseu
+	specs.lpseu = lpseu
+
+	specs[#specs+1] = lmnem
+	specs.lmnem = lmnem
+
+	return specs, pseudos, mnems
+end
+
diff --git a/modules/src/em_data/make_flag_c.lua b/modules/src/em_data/make_flag_c.lua
new file mode 100644
index 000000000..56614c9a3
--- /dev/null
+++ b/modules/src/em_data/make_flag_c.lua
@@ -0,0 +1,21 @@
+require "modules.src.em_data.em_table_lib"
+
+local specs, pseudos, mnems = load_table()
+
+local function flag(c)
+	if c == "-" then
+		return "NO"
+	else
+		return c:upper()
+	end
+end
+
+print("#include <em_flag.h>")
+print("char em_flag[] = {")
+for _, mnem in ipairs(mnems) do
+	print(string.format("\tPAR_%s | FLO_%s,",
+		flag(mnem.flags1:sub(1, 1)),
+		flag(mnem.flags1:sub(2, 2))))
+end
+print("};")
+
diff --git a/modules/src/em_data/make_mnem_c.lua b/modules/src/em_data/make_mnem_c.lua
new file mode 100644
index 000000000..6ff02fa75
--- /dev/null
+++ b/modules/src/em_data/make_mnem_c.lua
@@ -0,0 +1,9 @@
+require "modules.src.em_data.em_table_lib"
+
+local specs, pseudos, mnems = load_table()
+
+print("char em_mnem[][4] = {")
+for _, mnem in ipairs(mnems) do
+	print(string.format('\t"%s",', mnem.name))
+end
+print("};")
diff --git a/modules/src/em_data/make_mnem_h.lua b/modules/src/em_data/make_mnem_h.lua
new file mode 100644
index 000000000..22c1dc235
--- /dev/null
+++ b/modules/src/em_data/make_mnem_h.lua
@@ -0,0 +1,7 @@
+require "modules.src.em_data.em_table_lib"
+
+local specs, pseudos, mnems = load_table()
+
+for _, mnem in ipairs(mnems) do
+	print(string.format("#define op_%s %d", mnem.name, mnem.num))
+end
diff --git a/modules/src/em_data/make_pseu_c.lua b/modules/src/em_data/make_pseu_c.lua
new file mode 100644
index 000000000..ca2fc7dd6
--- /dev/null
+++ b/modules/src/em_data/make_pseu_c.lua
@@ -0,0 +1,9 @@
+require "modules.src.em_data.em_table_lib"
+
+local specs, pseudos, mnems = load_table()
+
+print("char em_pseu[][4] = {")
+for _, pseu in ipairs(pseudos) do
+	print(string.format('\t"%s",', pseu.name))
+end
+print("};")
diff --git a/modules/src/em_data/make_pseu_h.lua b/modules/src/em_data/make_pseu_h.lua
new file mode 100644
index 000000000..8e3b10c5f
--- /dev/null
+++ b/modules/src/em_data/make_pseu_h.lua
@@ -0,0 +1,7 @@
+require "modules.src.em_data.em_table_lib"
+
+local specs, pseudos, mnems = load_table()
+
+for _, pseu in ipairs(pseudos) do
+	print(string.format("#define ps_%s %d", pseu.name, pseu.num))
+end
diff --git a/modules/src/em_data/make_spec_h.lua b/modules/src/em_data/make_spec_h.lua
new file mode 100644
index 000000000..32472b68d
--- /dev/null
+++ b/modules/src/em_data/make_spec_h.lua
@@ -0,0 +1,7 @@
+require "modules.src.em_data.em_table_lib"
+
+local specs, pseudos, mnems = load_table()
+
+for _, spec in ipairs(specs) do
+	print(string.format("#define sp_%s %d", spec.name, spec.num))
+end
diff --git a/modules/src/em_data/new_table b/modules/src/em_data/new_table
deleted file mode 100755
index bdb7956a6..000000000
--- a/modules/src/em_data/new_table
+++ /dev/null
@@ -1,76 +0,0 @@
-#!/bin/sh
-set -e
-
-ed=$1
-em_table=$2
-h=${3-.}
-d=${4-.}
-
-p=$(grep fpseu $em_table | cut -f2)
-m=$(grep fmnem $em_table | cut -f2)
-
-$ed - $em_table <<'A' > X
-1,/^$/g/	/s// /gp
-A
-
-$ed - $em_table <<'A' | awk '{$2=$2+'$p'; print}' > Y
-1,/^$/d
-1,/^$/g/	/s// /gp
-A
-
-$ed - $em_table <<'A' | awk '{print $0,'$m'+i++}' > Z
-1,/^$/d
-1,/^$/d
-1,/^$/g/	/s// /gp
-A
-$ed - $em_table | awk '{print $0,'$m'+i++}'
-
-i=`wc -l <Y`
-echo 'lpseu' `expr $i + $p - 1` >>X
-i=`wc -l <Z`
-echo 'lmnem' `expr $i + $m - 1` >>X
-
-$ed - X <<'A' > $h/em_spec.h
-g/^/s//#define sp_/p
-A
-
-$ed - Y <<'A' > $h/em_pseu.h
-g/ \(.*\) .*/s// \1/
-g/\(.*\) \(.*\)/s//#define ps_\1 \2/p
-A
-
-$ed - Z <<'A' > $h/em_mnem.h
-g/ .* /s// /
-g/\(.*\) \(.*\)/s//#define op_\1 \2/p
-A
-
-(
-echo 'char em_pseu[][4] = {'
-$ed - Y <<'A'
-g/\(...\).*/s//	"\1",/p
-A
-echo '};'
-) > $d/em_pseu.c
-
-(
-echo 'char em_mnem[][4] = {'
-$ed - Z <<'A'
-g/\(...\).*/s//	"\1",/p
-A
-echo '};'
-) > $d/em_mnem.c
-
-(
-echo '#include	<em_flag.h>
-char em_flag[] = {'
-$ed - Z <<'A' | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
-g/^... /s///
-g/ .*/s///
-g/\(.\)\(.\)/s//PAR_\1 | FLO_\2/
-g/-/s//NO/g
-g/.*/s//	&,/p
-A
-echo '};'
-) > $d/em_flag.c
-
-rm X Y Z