diff --git a/modflash/Makefile b/modflash/Makefile
new file mode 100644
index 0000000..67624da
--- /dev/null
+++ b/modflash/Makefile
@@ -0,0 +1,37 @@
+# Supported environments:
+#   * GNU/Linux
+#   * Windows NT (using MinGW/MSYS/Cygwin/WSL)
+
+ifeq ($(OS),Windows_NT)
+GENROM	= GenRom.exe
+ADDITEM	= AddItem.exe
+else
+GENROM	= GenRom
+ADDITEM	= AddItem
+endif
+
+.PHONY: all
+all: | FLASHempty.ZX1 $(GENROM) $(ADDITEM) ./addroms.sh ./addcores.sh roms.txt cores.txt
+	cp FLASHempty.ZX1 FLASH.ZX1
+	./addroms.sh
+	./addcores.sh
+
+ifneq ($(OS),Windows_NT)
+$(GENROM): GenRom.c
+	$(CC) $(CFLAGS) $< -o $@
+
+$(ADDITEM): AddItem.c
+	$(CC) $(CFLAGS) $< -o $@
+endif
+
+.PHONY: clean
+clean:
+ifeq ($(OS),Windows_NT)
+	# Nothing to do
+else
+	rm -f $(GENROM) $(ADDITEM)
+endif
+
+.PHONY: dist-clean
+dist-clean: clean
+	rm -f FLASH.ZX1
diff --git a/modflash/README.md b/modflash/README.md
new file mode 100644
index 0000000..251c9db
--- /dev/null
+++ b/modflash/README.md
@@ -0,0 +1,31 @@
+# Target
+
+File `FLASH.ZX1`.
+
+# Windows
+
+## Build
+
+```batch
+make.bat
+```
+
+# GNU/Linux
+
+## Build
+
+```bash
+make
+```
+
+## Clean
+
+```bash
+make clean
+```
+
+or even to remove `FLASH.ZX1` file:
+
+```bash
+make dist-clean
+```
diff --git a/modflash/addcore.bat b/modflash/addcore.bat
index fe738d2..f4a4938 100644
--- a/modflash/addcore.bat
+++ b/modflash/addcore.bat
@@ -1,49 +1,6 @@
 @echo off
 set /a i=2
-call :AddCore 0 "Apple 2"              cores\Apple2.ZX1
-call :AddCore 0 "Atari 2600"           cores\Atari2600.ZX1
-call :AddCore 0 "Atari 800 XL"         cores\Atari800XL.ZX1
-call :AddCore 0 "Acorn Atom"           cores\Atom.ZX1
-call :AddCore 0 "BBC Micro"            cores\BBCMicro.ZX1
-call :AddCore 0 "C16"                  cores\C16.ZX1
-call :AddCore 0 "C64"                  cores\C64.ZX1
-call :AddCore 0 "Test"                 cores\Test.ZX1
-call :AddCore 0 "ColecoVision"         cores\Coleco.ZX1
-call :AddCore 0 "CPC464"               cores\CPC464.ZX1
-call :AddCore 0 "CPC6128"              cores\CPC6128.ZX1
-call :AddCore 0 "Acorn Electron"       cores\Electron.ZX1
-call :AddCore 0 "Galaksija"            cores\Galaksija.zx1
-call :AddCore 0 "Jupiter Ace"          cores\JupAce.ZX1
-call :AddCore 0 "Spectrum Kyp"         cores\Kyp.ZX1
-call :AddCore 0 "MSX"                  cores\MSX.ZX1
-call :AddCore 0 "Nintendo NES"         cores\NES.ZX1
-call :AddCore 0 "Oric"                 cores\Oric.ZX1
-call :AddCore 0 "PC"                   cores\PC.ZX1
-call :AddCore 0 "PC2M"                 cores\PC2M.ZX1
-call :AddCore 0 "Sam Coupe"            cores\SamCoupe.ZX1
-call :AddCore 0 "Sega Master System"   cores\SMS.ZX1
-call :AddCore 0 "TBBlue"               cores\TBBlue.ZX1
-call :AddCore 0 "Vectrex"              cores\Vectrex.ZX1
-call :AddCore 0 "VIC-20"               cores\VIC20.ZX1
-call :AddCore 0 "Arcade Pacman"        cores\Arcades\pacman.ZX1
-call :AddCore 0 "Arcade Galaxian"      cores\Arcades\galaxian.ZX1
-call :AddCore 0 "Arcade Phoenix"       cores\Arcades\phoenix.ZX1
-call :AddCore 0 "Arcade The Glob"      cores\Arcades\theblob.ZX1
-call :AddCore 0 "Arcade Scramble"      cores\Arcades\scramble.ZX1
-call :AddCore 0 "Arcade Frogger"       cores\Arcades\frogger.ZX1
-call :AddCore 0 "Arcade Moon Cresta"   cores\Arcades\mooncresta.ZX1
-call :AddCore 0 "Arcade Jump Shot"     cores\Arcades\jumpshot.ZX1
-call :AddCore 0 "Arcade Amidar"        cores\Arcades\amidar.ZX1
-call :AddCore 0 "Arcade Black Hole"    cores\Arcades\blackhole.ZX1
-call :AddCore 0 "Arcade Crush Roller"  cores\Arcades\crush2.ZX1
-call :AddCore 0 "Arcade Galaga"        cores\Arcades\galaga.ZX1
-call :AddCore 0 "Arcade Gorkans"       cores\Arcades\gorkans.ZX1
-call :AddCore 0 "Arcade Lizard Wizard" cores\Arcades\lizwiz.ZX1
-call :AddCore 0 "Arcade Mr. Do"        cores\Arcades\mrdo.ZX1
-call :AddCore 0 "Arcade Ms. Pacman"    cores\Arcades\mspacman.ZX1
-call :AddCore 0 "Arcade Orbitron"      cores\Arcades\orbitron.ZX1
-call :AddCore 0 "Arcade Pac Miner"     cores\Arcades\pacminer.ZX1
-call :AddCore 0 "Arcade Pacman Plus"   cores\Arcades\pacplus.ZX1
+for /f "eol=# tokens=1,2,3 delims=;" %%a in (cores.txt) do call :AddCore %%a %%b %%c
 exit /b
 
 :AddCore
diff --git a/modflash/addcores.sh b/modflash/addcores.sh
new file mode 100755
index 0000000..48bb1c4
--- /dev/null
+++ b/modflash/addcores.sh
@@ -0,0 +1,27 @@
+#!/bin/bash -e
+GENROM=./GenRom
+ADDITEM=./AddItem
+i=2
+
+Error() {
+	echo "ERROR: Exit status $1. Stopped." >&2
+	exit $1
+}
+
+AddCore() {
+	local f=${3%.*}.tap
+	echo "Adding core $i: \"$2\" ($3)..."
+	$GENROM $1 "$2" $3 $f || Error $?
+	$ADDITEM CORE$i $f || Error $?
+	rm -f $f
+	let i+=1
+}
+
+OnExit() {
+        rm -f addcores.tmp
+}
+
+trap OnExit EXIT
+
+awk -F \; '/^[^#]+/{print "AddCore " $1 " " $2 " " gensub(/\\/, "/", "g", $3)}' cores.txt >addcores.tmp
+. ./addcores.tmp
diff --git a/modflash/addrom.bat b/modflash/addrom.bat
index cee4039..d82c649 100644
--- a/modflash/addrom.bat
+++ b/modflash/addrom.bat
@@ -1,32 +1,6 @@
 @echo off
 set /a i=0
-call :AddROM xdnlh17  "ZX Spectrum 48K"      roms\48.rom
-call :AddROM xtdnh1   "ZX Spectrum 128K EN"  roms\128en.rom
-call :AddROM xt       "ZX Spectrum +2A EN"   roms\plus3en41.rom
-call :AddROM xdlh     "48K Cargando Leches"  roms\leches.rom
-call :AddROM xdnlh17  "Inves Spectrum+"      roms\inves.rom
-call :AddROM xdnlh17  "Microdigital TK95"    roms\tk95.rom
-call :AddROM xdnlh17  "Looking Glass 1.07"   roms\lg18v07.rom
-call :AddROM xdnmlh17 "Timex Computer 2048"  roms\tc2048.rom
-call :AddROM xmh1     "Timex Computer 2068"  roms\tc2068.rom
-call :AddROM xpch1    "Pentagon 128"         roms\pentagon.rom
-call :AddROM xdlh17   "Pokemon"              roms\pokemon48.rom
-call :AddROM xdnlh17  "Gosh Wonderful v1.33" roms\gw03v33.rom
-call :AddROM xdh1     "SE Basic IV 4.0 Anya" roms\se.rom
-call :AddROM xtdnh1   "Derby+"               roms\derbyp.rom
-call :AddROM xt       "DivMMC +3e ES 1.43"   roms\plus3es143.rom
-call :AddROM xt       "Next +3e 1.53"        roms\next.rom
-call :AddROM xth1ru   "BBC Micro"            roms\BBCBasic.rom
-call :AddROM xth1ru   "Jupiter Ace"          roms\jupace.rom
-call :AddROM xth1ru   "ZX81"                 roms\zx81.rom
-call :AddROM xlh17ru  "Manic Miner (1983)"   roms\ManicMiner.rom
-call :AddROM xlh17ru  "Jet Set Willy (1984)" roms\JetSetWilly.rom
-call :AddROM xlh17ru  "Jet Pac (1983)"       roms\JetPac.rom
-call :AddROM xlh17ru  "Cookie (1983)"        roms\Cookie.rom
-call :AddROM xlh17ru  "Tranz Am (1983)"      roms\TranzAm.rom
-call :AddROM xlh17ru  "Planetoids (1983)"    roms\Planetoids.rom
-call :AddROM xlh17ru  "Space Raiders (1983)" roms\SpaceRaiders.rom
-call :AddROM xlh17ru  "Misco Jones (2013)"   roms\MiscoJones.rom
+for /f "eol=# tokens=1,2,3 delims=;" %%a in (roms.txt) do call :AddROM %%a %%b %%c
 exit /b
 
 :AddROM
diff --git a/modflash/addroms.sh b/modflash/addroms.sh
new file mode 100755
index 0000000..0b1c013
--- /dev/null
+++ b/modflash/addroms.sh
@@ -0,0 +1,29 @@
+#!/bin/bash -e
+GENROM=./GenRom
+ADDITEM=./AddItem
+i=0
+
+Error() {
+	echo "ERROR: Exit status $1. Stopped." >&2
+	exit $1
+}
+
+AddROM() {
+	local n=`stat --printf "%s" $3`
+	local i1=$((i+n/16384-1))
+	local f=${3%.*}.tap
+	echo "Adding ROM in slots $i-$i1: \"$2\" ($3)..."
+	$GENROM $1 "$2" $3 $f || Error $?
+	$ADDITEM ROM $i $f || Error $?
+	rm -f $f
+	let i=i1+1
+}
+
+OnExit() {
+	rm -f addroms.tmp
+}
+
+trap OnExit EXIT
+
+awk -F \; '/^[^#]+/{print "AddROM " $1 " " $2 " " gensub(/\\/, "/", "g", $3)}' roms.txt >addroms.tmp
+. ./addroms.tmp
diff --git a/modflash/cores.txt b/modflash/cores.txt
new file mode 100644
index 0000000..cf52814
--- /dev/null
+++ b/modflash/cores.txt
@@ -0,0 +1,44 @@
+0; "Apple 2";              cores\Apple2.ZX1
+0; "Atari 2600";           cores\Atari2600.ZX1
+0; "Atari 800 XL";         cores\Atari800XL.ZX1
+0; "Acorn Atom";           cores\Atom.ZX1
+0; "BBC Micro";            cores\BBCMicro.ZX1
+0; "C16";                  cores\C16.ZX1
+0; "C64";                  cores\C64.ZX1
+0; "Test";                 cores\Test.ZX1
+0; "ColecoVision";         cores\Coleco.ZX1
+0; "CPC464";               cores\CPC464.ZX1
+0; "CPC6128";              cores\CPC6128.ZX1
+0; "Acorn Electron";       cores\Electron.ZX1
+0; "Galaksija";            cores\Galaksija.zx1
+0; "Jupiter Ace";          cores\JupAce.ZX1
+0; "Spectrum Kyp";         cores\Kyp.ZX1
+0; "MSX";                  cores\MSX.ZX1
+0; "Nintendo NES";         cores\NES.ZX1
+0; "Oric";                 cores\Oric.ZX1
+0; "PC";                   cores\PC.ZX1
+0; "PC2M";                 cores\PC2M.ZX1
+0; "Sam Coupe";            cores\SamCoupe.ZX1
+0; "Sega Master System";   cores\SMS.ZX1
+0; "TBBlue";               cores\TBBlue.ZX1
+0; "Vectrex";              cores\Vectrex.ZX1
+0; "VIC-20";               cores\VIC20.ZX1
+0; "Arcade Pacman";        cores\Arcades\pacman.ZX1
+0; "Arcade Galaxian";      cores\Arcades\galaxian.ZX1
+0; "Arcade Phoenix";       cores\Arcades\phoenix.ZX1
+0; "Arcade The Glob";      cores\Arcades\theblob.ZX1
+0; "Arcade Scramble";      cores\Arcades\scramble.ZX1
+0; "Arcade Frogger";       cores\Arcades\frogger.ZX1
+0; "Arcade Moon Cresta";   cores\Arcades\mooncresta.ZX1
+0; "Arcade Jump Shot";     cores\Arcades\jumpshot.ZX1
+0; "Arcade Amidar";        cores\Arcades\amidar.ZX1
+0; "Arcade Black Hole";    cores\Arcades\blackhole.ZX1
+0; "Arcade Crush Roller";  cores\Arcades\crush2.ZX1
+0; "Arcade Galaga";        cores\Arcades\galaga.ZX1
+0; "Arcade Gorkans";       cores\Arcades\gorkans.ZX1
+0; "Arcade Lizard Wizard"; cores\Arcades\lizwiz.ZX1
+0; "Arcade Mr. Do";        cores\Arcades\mrdo.ZX1
+0; "Arcade Ms. Pacman";    cores\Arcades\mspacman.ZX1
+0; "Arcade Orbitron";      cores\Arcades\orbitron.ZX1
+0; "Arcade Pac Miner";     cores\Arcades\pacminer.ZX1
+0; "Arcade Pacman Plus";   cores\Arcades\pacplus.ZX1
diff --git a/modflash/roms.txt b/modflash/roms.txt
new file mode 100644
index 0000000..c30ade6
--- /dev/null
+++ b/modflash/roms.txt
@@ -0,0 +1,27 @@
+xdnlh17;  "ZX Spectrum 48K";      roms\48.rom
+xtdnh1;   "ZX Spectrum 128K EN";  roms\128en.rom
+xt;       "ZX Spectrum +2A EN";   roms\plus3en41.rom
+xdlh;     "48K Cargando Leches";  roms\leches.rom
+xdnlh17;  "Inves Spectrum+";      roms\inves.rom
+xdnlh17;  "Microdigital TK95";    roms\tk95.rom
+xdnlh17;  "Looking Glass 1.07";   roms\lg18v07.rom
+xdnmlh17; "Timex Computer 2048";  roms\tc2048.rom
+xmh1;     "Timex Computer 2068";  roms\tc2068.rom
+xpch1;    "Pentagon 128";         roms\pentagon.rom
+xdlh17;   "Pokemon";              roms\pokemon48.rom
+xdnlh17;  "Gosh Wonderful v1.33"; roms\gw03v33.rom
+xdh1;     "SE Basic IV 4.0 Anya"; roms\se.rom
+xtdnh1;   "Derby+";               roms\derbyp.rom
+xt;       "DivMMC +3e ES 1.43";   roms\plus3es143.rom
+xt;       "Next +3e 1.53";        roms\next.rom
+xth1ru;   "BBC Micro";            roms\BBCBasic.rom
+xth1ru;   "Jupiter Ace";          roms\jupace.rom
+xth1ru;   "ZX81";                 roms\zx81.rom
+xlh17ru;  "Manic Miner (1983)";   roms\ManicMiner.rom
+xlh17ru;  "Jet Set Willy (1984)"; roms\JetSetWilly.rom
+xlh17ru;  "Jet Pac (1983)";       roms\JetPac.rom
+xlh17ru;  "Cookie (1983)";        roms\Cookie.rom
+xlh17ru;  "Tranz Am (1983)";      roms\TranzAm.rom
+xlh17ru;  "Planetoids (1983)";    roms\Planetoids.rom
+xlh17ru;  "Space Raiders (1983)"; roms\SpaceRaiders.rom
+xlh17ru;  "Misco Jones (2013)";   roms\MiscoJones.rom