Add Juku 5104 floppies with a new filesystem_track_order option

Author: boamaod

src/formats/build.py

@@ -23,6 +23,7 @@
     "hplif",
     "ibm",
     "icl30",
+    "juku",
     "mac",
     "micropolis",
     "ms2000",

src/formats/juku.textpb

@@ -0,0 +1,99 @@
+shortname: 'Juku E5104'
+comment: 'CP/M'
+
+documentation:
+<<<
+Juku E5104 is an Estonian school computer from late 1980s and
+early 1990s. It was designed by EKTA in 1985, and starting
+from 1988 produced in Narva "Baltijets" factory. Arguably
+the school computer was technically outdated already when
+released, but still occupies a precious spot in the memories
+of a whole generation of Estonian IT professionals.
+
+The system uses dual 5.25 inch ИЗОТ ЕС5323 (IZOT ES5323)
+diskette drive with regular MFM encoded DSDD. The disks have
+a sector skew factor 2 and tracks start from outside of the
+diskette _for both sides_, which is a combination that somewhat
+complicates reading CP/M filesystem content with common tools.
+
+Mostly 800kB (786kB) DSDD disks were used, but there are also
+400kB (386kB) SSDD floppies in circulation.
+
+## References (all in Estonian)
+
+  - [How to read the content of Juku disks?](https://github.com/infoaed/juku3000/blob/master/docs/kettad.md)
+  - [List of recovered Juku software](https://github.com/infoaed/juku3000/blob/master/docs/tarkvara-kataloog.md)
+  - [System disks for E5104](https://elektroonikamuuseum.ee/juku_arvuti_tarkvara.html)
+>>>
+
+image_reader {
+	filename: "image.juk"
+	type: IMAGETYPE_IMG
+}
+
+image_writer {
+	filename: "image.juk"
+	type: IMAGETYPE_IMG
+}
+
+encoder {
+	ibm {}
+}
+
+decoder {
+	ibm {}
+}
+
+layout {
+	format_type: FORMATTYPE_80TRACK
+	tracks: 80
+	sides: 2
+	filesystem_track_order: HCS
+	layoutdata {
+		sector_size: 512
+		physical {
+			start_sector: 1
+			count: 10
+		}
+		filesystem {
+			start_sector: 1
+			count: 10
+			skew: 2
+		}
+		
+	}
+}
+
+option_group {
+	comment: "$formats"
+
+	option {
+		name: "800"
+		comment: '800kB 80-track 10-sector DSDD'
+		set_by_default: true
+	}
+
+	option {
+		name: "400"
+		comment: '400kB 80-track 10-sector SSDD'
+
+		config {
+			layout {
+				sides: 1
+			}
+		}
+	}
+
+}
+
+filesystem {
+	type: CPMFS
+	cpmfs {
+		filesystem_start {
+			side: 0
+			track: 2
+		}
+		block_size: 4096
+		dir_entries: 128
+	}
+}