diff --git a/Makefile b/Makefile
index ab51447..b968df4 100644
--- a/Makefile
+++ b/Makefile
@@ -27,8 +27,6 @@ include sdk/common.mk
 
 # Use uppercase for FAT filesystem
 prefix		?= SD
-exec_prefix	?= $(prefix)
-bindir		?= $(exec_prefix)/BIN
 
 TARGETS=\
  utils\
@@ -46,11 +44,11 @@ build-utils: | utils
 
 .PHONY: install-utils
 install-utils: | utils
-	$(MAKE) -w -C $| bindir=$(shell realpath --relative-to=$| $(bindir)) install
+	$(MAKE) -w -C $| prefix=$(shell realpath --relative-to=$| $(prefix)) install
 
 .PHONY: uninstall-utils
 uninstall-utils: | utils
-	$(MAKE) -w -C $| bindir=$(shell realpath --relative-to=$| $(bindir)) uninstall
+	$(MAKE) -w -C $| prefix=$(shell realpath --relative-to=$| $(prefix)) uninstall
 
 .PHONY: clean-utils
 clean-utils: | utils
@@ -68,11 +66,11 @@ build-software: | software
 
 .PHONY: install-software
 install-software: | software
-	$(MAKE) -w -C $| bindir=$(shell realpath --relative-to=$| $(bindir)) install
+	$(MAKE) -w -C $| prefix=$(shell realpath --relative-to=$| $(prefix)) install
 
 .PHONY: uninstall-software
 uninstall-software: | software
-	$(MAKE) -w -C $| bindir=$(shell realpath --relative-to=$| $(bindir)) uninstall
+	$(MAKE) -w -C $| prefix=$(shell realpath --relative-to=$| $(prefix)) uninstall
 
 .PHONY: clean-software
 clean-software: | software
diff --git a/software/Makefile b/software/Makefile
index 17dbfb7..b353d62 100644
--- a/software/Makefile
+++ b/software/Makefile
@@ -25,10 +25,9 @@ include ../sdk/common.mk
 
 # Use uppercase for FAT filesystem
 prefix		?= .
-exec_prefix	?= $(prefix)
-bindir		?= $(exec_prefix)/BIN
 
 SUBDIRS=\
+ esxdos\
  esprst\
  iwconfig
 
@@ -49,7 +48,7 @@ $(foreach d,$(SUBDIRS),$(eval $(call build_rule,$(d))))
 
 define install_rule=
 install-$1: | $1
-	$$(MAKE) -w -C $$| bindir=$$(shell realpath --relative-to=$$| $$(bindir)) install
+	$$(MAKE) -w -C $$| prefix=$$(shell realpath --relative-to=$$| $$(prefix)) install
 endef
 
 $(foreach d,$(SUBDIRS),$(eval $(call install_rule,$(d))))
@@ -58,7 +57,7 @@ $(foreach d,$(SUBDIRS),$(eval $(call install_rule,$(d))))
 
 define uninstall_rule=
 uninstall-$1: | $1
-	$$(MAKE) -w -C $$| bindir=$$(shell realpath --relative-to=$$| $$(bindir)) uninstall
+	$$(MAKE) -w -C $$| prefix=$$(shell realpath --relative-to=$$| $$(prefix)) uninstall
 endef
 
 $(foreach d,$(SUBDIRS),$(eval $(call uninstall_rule,$(d))))
diff --git a/software/esxdos/.gitignore b/software/esxdos/.gitignore
new file mode 100644
index 0000000..371730d
--- /dev/null
+++ b/software/esxdos/.gitignore
@@ -0,0 +1,6 @@
+# SPDX-FileCopyrightText: 2021 Ivan Tatarinov <ivan-tat@ya.ru>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+build
+cache
diff --git a/software/esxdos/Makefile b/software/esxdos/Makefile
new file mode 100644
index 0000000..2ee4257
--- /dev/null
+++ b/software/esxdos/Makefile
@@ -0,0 +1,197 @@
+# SPDX-FileCopyrightText: 2021 Ivan Tatarinov <ivan-tat@ya.ru>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# Supported environments:
+#   * GNU on Linux, FreeBSD etc.
+#   * GNU on Windows NT (using MinGW/MSYS/Cygwin/WSL)
+#
+# Build:
+#   make [all]
+# Install / Uninstall:
+#   make [prefix=<PREFIX>] install | uninstall
+# Clean:
+#   make clean | distclean
+
+include ../../sdk/common.mk
+
+# Use uppercase for FAT filesystem
+prefix		?= .
+exec_prefix	?= $(prefix)
+bindir		?= $(exec_prefix)/BIN
+docdir		?= $(prefix)/DOCS
+sysdir		?= $(exec_prefix)/SYS
+sysconfdir	?= ${sysdir}/CONFIG
+tmpdir		?= $(prefix)/TMP
+
+# Disable execution mode for FAT filesystem
+INSTALL		?= install -m 644
+INSTALL_PROGRAM	?= $(INSTALL)
+RM		?= rm -f
+
+ESXDOSNAME	= esxdos089
+
+ROOT_FILES=\
+ ESX089.NFO\
+ ESXMMC.BIN\
+ README.TXT
+
+BIN_FILES=\
+ 128\
+ CAL\
+ CD\
+ CHMOD\
+ CP\
+ DATE\
+ DFWLOAD\
+ DIVIDEO\
+ DRIVES\
+ DSKPROBE\
+ DUMPMEM\
+ FILE\
+ GRAMON\
+ GSC\
+ HEXDUMP\
+ HEXVIEW\
+ LAUNCHER\
+ LS\
+ LSTAP\
+ MKDIR\
+ MKTRD\
+ MORE\
+ MV\
+ PARTINFO\
+ PLAYPT3\
+ PLAYSQT\
+ PLAYSTC\
+ PLAYTFM\
+ PLAYWAV\
+ RM\
+ SCL2TRD\
+ SERCP\
+ SNAPLOAD\
+ SPEAKCZ\
+ STRINGS\
+ TAPEIN\
+ TAPEOUT\
+ TAR\
+ TE\
+ TSPLAY\
+ VDISK
+
+DOC_FILES=\
+ DIVIDEO.TXT\
+ GRAMON.TXT\
+ PLAYWAV.TXT\
+ SNAPLOAD.TXT\
+ SPEAKCZ.TXT\
+ TEINFO.TXT\
+ TRKPLAY.TXT
+
+SYS_FILES=\
+ BDIR.KO\
+ BETADISK.SYS\
+ BFILE.KO\
+ ERRMSG.KO\
+ ESXDOS.SYS\
+ NMI_HELP.SCR\
+ NMI.SYS\
+ TAPE.KO\
+ TRDBOOT.BIN\
+ TRDOS54T.KO\
+ VDISK.KO
+
+SYSCONF_FILES=\
+ ESXDOS.CFG\
+ TRDOS.CFG
+
+.PHONY: all
+all: install
+
+build\
+cache\
+$(DESTDIR)$(prefix)\
+$(DESTDIR)$(bindir)\
+$(DESTDIR)$(docdir)\
+$(DESTDIR)$(sysdir)\
+$(DESTDIR)$(sysconfdir)\
+$(DESTDIR)$(tmpdir):
+	mkdir -p $@
+
+cache/$(ESXDOSNAME).extracted: cache/$(ESXDOSNAME).zip | cache build
+	echo 'd455888361cd13d455e362a4c841452b6f4568d30f9069443044affdd40de9a4  $<' >$<.sha256
+	sha256sum -c $<.sha256
+	rm -f $<.sha256
+	rm -rf cache/esxdos
+	unzip -nq $< -d cache/esxdos
+	mv cache/esxdos/* build
+	rmdir cache/esxdos
+	touch $@
+
+cache/$(ESXDOSNAME).zip: | cache
+	wget -c http://www.esxdos.org/files/$(ESXDOSNAME).zip -O $@
+
+define install_root_rule =
+$$(DESTDIR)$$(prefix)/$1: build/$1 | $$(DESTDIR)$$(prefix)
+	$$(INSTALL) $$< $$@
+endef
+
+$(foreach f,$(ROOT_FILES),$(eval $(call install_root_rule,$(f))))
+
+define install_bin_rule =
+$$(DESTDIR)$$(bindir)/$1: build/BIN/$1 | $$(DESTDIR)$$(bindir)
+	$$(INSTALL_PROGRAM) $$< $$@
+endef
+
+$(foreach f,$(BIN_FILES),$(eval $(call install_bin_rule,$(f))))
+
+define install_doc_rule =
+$$(DESTDIR)$$(docdir)/$1: build/DOCS/$1 | $$(DESTDIR)$$(docdir)
+	$$(INSTALL) $$< $$@
+endef
+
+$(foreach f,$(DOC_FILES),$(eval $(call install_doc_rule,$(f))))
+
+define install_sys_rule =
+$$(DESTDIR)$$(sysdir)/$1: build/SYS/$1 | $$(DESTDIR)$$(sysdir)
+	$$(INSTALL) $$< $$@
+endef
+
+$(foreach f,$(SYS_FILES),$(eval $(call install_sys_rule,$(f))))
+
+define install_sysconf_rule =
+$$(DESTDIR)$$(sysconfdir)/$1: build/SYS/CONFIG/$1 | $$(DESTDIR)$$(sysconfdir)
+	$$(INSTALL) $$< $$@
+endef
+
+$(foreach f,$(SYSCONF_FILES),$(eval $(call install_sysconf_rule,$(f))))
+
+.PHONY: install
+install:\
+ cache/$(ESXDOSNAME).extracted\
+ $(foreach f,$(ROOT_FILES),$(DESTDIR)$(prefix)/$(f))\
+ $(foreach f,$(BIN_FILES),$(DESTDIR)$(bindir)/$(f))\
+ $(foreach f,$(DOC_FILES),$(DESTDIR)$(docdir)/$(f))\
+ $(foreach f,$(SYS_FILES),$(DESTDIR)$(sysdir)/$(f))\
+ $(foreach f,$(SYSCONF_FILES),$(DESTDIR)$(sysconfdir)/$(f))
+	mkdir -p $(DESTDIR)$(tmpdir)
+
+.PHONY: uninstall
+uninstall:
+	$(RM)\
+ $(foreach f,$(ROOT_FILES),$(DESTDIR)$(prefix)/$(f))\
+ $(foreach f,$(BIN_FILES),$(DESTDIR)$(bindir)/$(f))\
+ $(foreach f,$(DOC_FILES),$(DESTDIR)$(docdir)/$(f))\
+ $(foreach f,$(SYS_FILES),$(DESTDIR)$(sysdir)/$(f))\
+ $(foreach f,$(SYSCONF_FILES),$(DESTDIR)$(sysconfdir)/$(f))
+
+.PHONY: clean
+clean:
+	rm -f\
+ cache/$(ESXDOSNAME).sha256\
+ cache/$(ESXDOSNAME).extracted
+	rm -rf cache/esxdos build/*
+
+.PHONY: distclean
+distclean:
+	rm -rf cache build