Update README to match recent changes

README.md

@@ -37,23 +37,27 @@ if you extract non-code assets from the demo or its source tree,
 and an `AGPL_DETAILS.md` file to explain the original author's
 intentions for compliance with the AGPL license.
 
-The demo itself is provided under 4 forms in the package:
+The demo itself is provided under 5 forms in the package:
 * A naked `STEPBACK.PRG` file meant to be executed e.g. from with
 an emulator with GEMDOS hard drive emulation.
-* A `stepback.msa` floppy image.
+* A `stepback.st` uncompressed floppy image.
+* A `stepback.msa` compressed floppy image.
 * A copy of the source tree `src.zip` that was used to compile
 the demo.
 * The full source history as a git bundle `stepback.bundle` which
 can be cloned with `git clone stepback.bundle`.
 
 # Building
 
-The build process expects to have rmac, cc, git and zip in the path.
+The build process expects to have
+rmac, cc, upx, hmsa, git and zip in the path.
 Rmac can be found on [the official rmac web site](https://rmac.is-slick.com/).
+UPX is [the Ultimate Packer for eXecutables](https://upx.github.io/).
+Hmsa is part of [the Hatari emulator](http://hatari.tuxfamily.org/).
 
-A basic build can be done in a single script `build.sh` which is
-useful during most incremental development. However, a full
-build from start to finish requires some manual steps:
+A regular build can be done in a single script `build.sh` which is
+useful during most incremental development. However, using the music
+from the editable file requires some manual steps:
 
 ## Converting the music
 
@@ -76,14 +80,6 @@ into the source tree. `AREGDUMP.BIN` is provided in the source
 tree already such that it's possible to modify the demo without
 having to build and execute `ACONVERT.PRG`
 
-## Packaging the floppy image
-
-The final package contains a floppy image, which gets created
-from within an Atari ST emulator. After running `build.sh`, run
-an emulator with `out/stepback/stepback.msa` mounted as a floppy and
-`out/tos/STEPBACK.PRG` available on an emulated hard disk, and
-copy that file onto the floppy. Once that's done, run `makedist.sh`.
-
 # (Un)important things
 
 ## Licensing