Merge pull request #471 from jepler/rx50-pdp11-format

Add support for PDP-11 RX-50 disks

doc/disk-ibm.md

@@ -18,6 +18,7 @@ metadata. Systems which use IBM scheme disks include but are not limited to:
   - NEC PC-98 series
   - Sharp X68000
   - Fujitsu FM Towns
+  - VAX & PDP-11
   - etc
 
 FluxEngine supports reading these. However, some variants are more peculiar

mkninja.sh

@@ -528,6 +528,7 @@ FORMATS="\
     northstar175 \
     northstar350 \
     northstar87 \
+    rx50 \
     tids990 \
     vgi \
     victor9k_ss \
@@ -668,6 +669,7 @@ encodedecodetest ibm720_525
 encodedecodetest mac400 scripts/mac400_test.textpb
 encodedecodetest mac800 scripts/mac800_test.textpb
 encodedecodetest n88basic
+encodedecodetest rx50
 encodedecodetest tids990
 encodedecodetest victor9k_ss
 encodedecodetest victor9k_ds

src/formats/rx50.textpb

@@ -0,0 +1,77 @@
+comment: 'Digital RX50 400kB 5.25" 80-track 10-sector SSQD'
+
+flux_sink {
+	drive {
+		high_density: true
+	}
+}
+
+flux_source {
+	drive {
+		high_density: true
+	}
+}
+
+image_reader {
+	filename: "rx50.img"
+	img {
+		tracks: 80
+		sides: 1
+		trackdata {
+			sector_size: 512
+			sector_range {
+				start_sector: 1
+				sector_count: 10
+			}
+		}
+	}
+}
+
+image_writer {
+	filename: "rx50.img"
+	img {}
+}
+
+encoder {
+	ibm {
+		trackdata {
+			track_length_ms: 167
+			clock_rate_khz: 300
+			gap3: 30
+			sectors {
+				sector: 1
+				sector: 2
+				sector: 3
+				sector: 4
+				sector: 5
+				sector: 6
+				sector: 7
+				sector: 8
+				sector: 9
+				sector: 10
+			}
+		}
+	}
+}
+
+decoder {
+	ibm {
+		trackdata {
+			sector_range {
+				min_sector: 1
+				max_sector: 10
+			}
+		}
+	}
+}
+
+cylinders {
+	start: 0
+	end: 79
+}
+
+heads {
+	start: 0
+	end: 0
+}
+