The following are notes while working with Project Oberon 2013, the
Oberon Linux Revival (olr), ETH Plugin Oberon for Windows 2.5, and Oberon
V4.0-2.3 for Windows while reading The Oberon System: User Guide and
Programmer's Manual, by Hans Reiser.

Peter De Wachter's Oberon RISC emulator on Windows, Linux, and macOS,
provide an excellent foundation for working with the current Oberon
work. The SETUP key is mapped to the F1 key, which is also true for ETH
Oberon 2.5. The PF1, PF2, and PF3 keys appear to be unique to earlier
Ceres hardware, and are no longer available in PO 2013. Ctrl-shift-del
is unique to Ceres 3, but is mapped to F12 on Peter's emulator. The
reset button on Xilinx Spartan 3 apparently is necessary for interrupt.

System.Open is now the first command, not Edit.Open, in System.Tool as
the text indicates. System.Tool of PO 2013 is far simpler than that of
PO, and many modules are missing/unimplemented (e.g. Backup).

Inverse imagining (PF1 and PF3) is toggled with F5 on olr, but the fonts
are not able to handle it resulting in a black screen. Umlauts were
available in Project Oberon (1992), but not in 2013. The downArrow gliph,
indicating business in Edit, is missing. Edit.Print is not implemented.
System.Time is not implemented (no rtc on Xilinx), nor is System.State.
Syntax10x.Scn.Fnt doesn't seem to work in PO 2013.

The module unload mouse chording seems to be a feature added later in
ETH Oberon, as it does not work in PO, (1992 or 2013. Is it available
in ETH Oberon Plugin for Windows 2.5?).