diff --git a/lib/make/mb_msxhub.mk b/lib/make/mb_msxhub.mk
index 8699440..a2db922 100644
--- a/lib/make/mb_msxhub.mk
+++ b/lib/make/mb_msxhub.mk
@@ -1,4 +1,5 @@
 
+MB_CACHE        ?=~/.cache
 MB_MSXHUB_API   ?= https://msxhub.com/api
 MB_MSXHUB_CACHE ?= $(MB_CACHE)/msxhub/repro-v0
 MB_MSXHUB_WGET  ?= wget
@@ -19,6 +20,11 @@ define mb_msxhub_file
 	$(if $(wildcard $(dir $(1))$(call _mb_lowercase,$(notdir $(1)))),,$(call mb_copy,$(MB_MSXHUB_CACHE)/$(subst $(MB_MSXHUB_API)/,,$(2)),$(dir $(1))$(call _mb_lowercase,$(notdir $(1)))))
 endef
 
+define mb_msxhub_get_dos1
+	$(call mb_msxhub_file,$(1)/MSXDOS.SYS,$(MB_MSXHUB_API)/MSXDOS1/1.03-1/get/MSXDOS1/msxdos.sys)
+	$(call mb_msxhub_file,$(1)/COMMAND.COM,$(MB_MSXHUB_API)/MSXDOS1/1.03-1/get/MSXDOS1/command.com)
+endef
+
 define mb_msxhub_get_dos2
 	$(call mb_msxhub_file,$(1)/MSXDOS2.SYS,$(MB_MSXHUB_API)/MSXDOS2/2.20-1/get/MSXDOS2/MSXDOS2.SYS)
 	$(call mb_msxhub_file,$(1)/COMMAND2.COM,$(MB_MSXHUB_API)/MSXDOS2/2.20-1/get/MSXDOS2/COMMAND2.COM)