diff --git a/README.md b/README.md
index 18830bee..14d52010 100644
--- a/README.md
+++ b/README.md
@@ -61,12 +61,20 @@ Which?
The current support state is as follows.
+Dinosaurs (🦖) have yet to be observed in real life --- I've written the
+decoder based on Kryoflux (or other) dumps I've found. I don't (yet) have
+real, physical disks in my hand to test the capture process.
+
+Unicorns (🦄) are completely real --- this means that I've read actual,
+physical disks with these formats and so know they work.
+
+### Old disk formats
+
| Format | Read? | Write? | Notes |
|:-----------------------------------------|:-----:|:------:|-------|
| IBM PC compatible | 🦄 | | and compatibles (like the Atari ST) |
| [Acorn ADFS](doc/disk-acornadfs.md) | 🦄 | | single- and double- sided |
| [Acorn DFS](doc/disk-acorndfs.md) | 🦄 | | |
-| [AES Superplus / No Problem](doc/disk-aeslanier.md) | 🦖 | | hard sectors! and _very_ experimental |
| [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) | 🦄 | | |
@@ -75,17 +83,23 @@ The current support state is as follows.
| [Brother 240kB](doc/disk-brother.md) | 🦄 | 🦄 | |
| [Macintosh 800kB](doc/disk-macintosh.md) | 🦖 | | and probably the 400kB too |
| [TRS-80](doc/disk-trs80.md) | 🦖 | | a minor variation of the IBM scheme |
-| [Victor 9000](doc/disk-victor9k.md) | 🦖 | | experimental, probably buggy |
{: .datatable }
-Dinosaurs (🦖) have yet to be observed in real life --- I've written the
-decoder based on Kryoflux (or other) dumps I've found. I don't (yet) have
-real, physical disks in my hand to test the capture process.
+### Even older disk formats
-Unicorns (🦄) are completely real --- this means that I've read actual,
-physical disks with these formats and so know they work.
+These formats are for particularly old, weird architectures, even by the
+standards of floppy disks. They've largely been implemented from single flux
+files with no access to physical hardware. Typically the reads were pretty
+bad and I've had to make a number of guesses as to how things work. They do,
+at least, check the CRC so what data's there is probably good.
-Notes:
+| Format | Read? | Write? | Notes |
+|:-----------------------------------------|:-----:|:------:|-------|
+| [AES Superplus / No Problem](doc/disk-aeslanier.md) | 🦖 | | hard sectors! |
+| [Victor 9000](doc/disk-victor9k.md) | 🦖 | | 8-inch |
+| [Zilog MCZ](doc/disk-zilogmcz.md) | 🦖 | | 8-inch _and_ hard sectors |
+{: .datatable }
+### Notes
- IBM PC disks are the lowest-common-denominator standard. A number of other
systems use this format in disguise (the Atari ST, late-era Apple
@@ -105,8 +119,8 @@ Notes:
is hard.
If you have samples of weird disks, and want to send them to me --- either
-FluxEngine or Kryoflux dumps, or (even better) actually physically --- I can
-identify them and add support.
+FluxEngine, Kryoflux or Catweasel dumps, or (even better) actually physically
+--- I can identify them and add support.
Please note that at this point I am *not interested in copy protected disks*.
It's not out of principle. It's just they'll drive me insane. FluxEngine will
diff --git a/doc/disk-zilogmcz.md b/doc/disk-zilogmcz.md
index 0f6bbb16..c27dd409 100644
--- a/doc/disk-zilogmcz.md
+++ b/doc/disk-zilogmcz.md
@@ -1,3 +1,41 @@
+Disk: Zilog MCZ
+===============
+
+The Zilog MCZ is an extremely early Z80 development system, produced by
+Zilog, which came out in 1976. It used twin 8-inch hard sectored floppy
+drives; here's one at the Centre
+for Computing History:
+
+
+
+
+