Add a documentation page for the Eco1.

README.md

@@ -97,9 +97,9 @@ people who've had it work).
 | [Acorn DFS](doc/disk-acorndfs.md)        |  🦄   |   🦖*  |                                     |
 | [Ampro Little Board](doc/disk-ampro.md)  |  🦖   |   🦖*   |                                     |
 | [Apple II DOS 3.3](doc/disk-apple2.md)   |  🦄   |        | doesn't do logical sector remapping |
-| [Amiga](doc/disk-amiga.md)               |  🦄   |        |                                     |
+| [Amiga](doc/disk-amiga.md)               |  🦄   |   🦖   |                                     |
 | [Commodore 64 1541](doc/disk-c64.md)     |  🦖   |        | and probably the other GCR formats  |
-| [Brother 120kB](doc/disk-brother.md)     |  🦄   |        |                                     |
+| [Brother 120kB](doc/disk-brother.md)     |  🦄   |   🦖   |                                     |
 | [Brother 240kB](doc/disk-brother.md)     |  🦄   |   🦄   |                                     |
 | [Brother FB-100](doc/disk-fb100.md)      |  🦖   |        | Tandy Model 100, Husky Hunter, knitting machines |
 | [Macintosh 800kB](doc/disk-macintosh.md) |  🦄   |   🦄   | and probably the 400kB too          |
@@ -123,6 +123,7 @@ at least, check the CRC so what data's there is probably good.
 | [AES Superplus / No Problem](doc/disk-aeslanier.md) |  🦖   | | hard sectors! |
 | [Durango F85](doc/disk-durangof85.md)    |  🦖   |        | 5.25" |
 | [DVK MX](doc/disk-mx.md)                 |  🦖   |        | Soviet PDP-11 clone |
+| [VDS Eco1](doc/disk-eco1.md)             |  🦖   |        | 8" mixed format |
 | [Micropolis](doc/disk-micropolis.md)     |  🦄   |        | Micropolis 100tpi drives |
 | [TI DS990 FD1000](doc/disk-tids990.md)   |  🦄   |  🦄    | 8" |
 | [Victor 9000](doc/disk-victor9k.md)      |  🦖   |        | 8" |

doc/disk-eco1.md

@@ -0,0 +1,40 @@
+Disk: VDS Eco1
+==============
+
+The Eco1 is a Italian CP/M machine produced in 1982. It used twin 8" drives,
+each storing 1.2MB, which was quite impressive for a CP/M machine in those
+days. Visually it is best described as 'very brown'.
+
+<div style="text-align: center">
+<a href="vds-eco1.jpg"> <img src="vds-eco1.jpg" alt="A contemporary advert for the Eco1"/></a>
+</div>
+
+Its format is standard IBM scheme, but with an interesting wrinkle: there are
+_three_ different formatting zones on the disk:
+
+  - Track 0 side 0: 26 sectors, 128 bytes per sector (3296 bytes)
+  - Track 0 side 1: 26 sectors, 256 bytes per sector (6656 bytes)
+  - All others: 16 sectors, 512 bytes per sector (8192 bytes)
+
+The standard `read ibm` command will autodetect and read these disks, but due
+to the format confusing the size autodetection the images need postprocessing
+to be useful, so there's a custom profile for the Eco1 which produces sensible
+images.
+
+Reading discs
+-------------
+
+Just do:
+
+```
+fluxengine read eco1 -o eco1.img
+```
+
+You should end up with an `eco1.img` of 1255168 bytes, containing all the
+sectors concatenated one after the other in CHS order, with no padding.
+
+References
+----------
+
+  - [Apulio Retrocomputing's page on the Eco1](https://www.apuliaretrocomputing.it/wordpress/?p=8976)
+

src/readables/eco1.textpb

@@ -6,7 +6,7 @@ input {
 
 output {
 	image {
-		filename: "ibm.img"
+		filename: "eco1.img"
 		img {
 			tracks: 77
 			sides: 2