Add a read-only MS2000 file system, and a format (with no encoder or decoder).

lib/build.mk

@@ -79,6 +79,7 @@ LIBFLUXENGINE_SRCS = \
 	lib/vfs/fatfs.cc \
 	lib/vfs/lif.cc \
 	lib/vfs/machfs.cc \
+	lib/vfs/microdos.cc \
 	lib/vfs/prodos.cc \
 	lib/vfs/smaky6fs.cc \
 	lib/vfs/philefs.cc \

lib/vfs/vfs.cc

@@ -215,6 +215,9 @@ std::unique_ptr<Filesystem> Filesystem::createFilesystem(
         case FilesystemProto::LIF:
             return Filesystem::createLifFilesystem(config, image);
 
+        case FilesystemProto::MICRODOS:
+            return Filesystem::createMicrodosFilesystem(config, image);
+
         default:
             Error() << "no filesystem configured";
             return std::unique_ptr<Filesystem>();

lib/vfs/vfs.h

@@ -256,6 +256,8 @@ public:
         const FilesystemProto& config, std::shared_ptr<SectorInterface> image);
     static std::unique_ptr<Filesystem> createLifFilesystem(
         const FilesystemProto& config, std::shared_ptr<SectorInterface> image);
+    static std::unique_ptr<Filesystem> createMicrodosFilesystem(
+        const FilesystemProto& config, std::shared_ptr<SectorInterface> image);
 
     static std::unique_ptr<Filesystem> createFilesystem(
         const FilesystemProto& config, std::shared_ptr<SectorInterface> image);

lib/vfs/vfs.proto

@@ -81,7 +81,9 @@ message LifProto
         [ default = 256, (help) = "LIF filesystem block size" ];
 }
 
-// NEXT_TAG: 15
+message MicrodosProto {}
+
+// NEXT_TAG: 16
 message FilesystemProto
 {
     enum FilesystemType
@@ -99,6 +101,7 @@ message FilesystemProto
         APPLEDOS = 10;
         PHILE = 11;
         LIF = 12;
+		MICRODOS = 13;
     }
 
     optional FilesystemType type = 10
@@ -116,6 +119,7 @@ message FilesystemProto
     optional Smaky6FsProto smaky6 = 11;
     optional PhileProto phile = 13;
     optional LifProto lif = 14;
+	optional MicrodosProto microdos = 15;
 
     optional SectorListProto sector_order = 9
         [ (help) = "specify the filesystem order of sectors" ];

src/formats/build.mk

@@ -23,6 +23,7 @@ FORMATS = \
 	icl30 \
 	mac \
 	micropolis \
+	ms2000 \
 	mx \
 	n88basic \
 	northstar \

src/formats/ms2000.textpb

@@ -0,0 +1,24 @@
+comment: 'MS2000 Microdisk Development System'
+
+image_writer {
+	filename: "ms2000.img"
+	type: IMG
+}
+
+layout {
+	tracks: 70
+	sides: 1
+	layoutdata {
+		sector_size: 512
+		physical {
+			start_sector: 1
+			count: 9
+		}
+	}
+}
+
+filesystem {
+	type: MICRODOS
+}
+
+