360K install: %DOSDIR% not defined

[mateuszviste]

spotted on 86Box when running a SvarDOS 20230813 installation via 360K floppies:

This is not a critical error, it only stays onscreen for two seconds or so and then everything works fine, but it's not very elegant.

[mateuszviste]

There are two issues here: first one is that SvarCOM keeps printing this ugly "DOSDIR not defined" message at every command prompt. I consider this to be a debug-level message, hence I think it should be hidden under normal operations.

Second problem is that the EN-only installer is trying to configure a codepage with MODE when the keyboard layout is chosen. This does not work because there is no MODE.COM on EN-only floppies (and no DISPLAY.EXE, and no *.CPX files). I'm not sure whether or not the installer should configure the user's keyboard on the fly at install time. I tend to think that it would be better to do it so the user is not lost when/if running FDISK, but then it means DISPLAY, CPX and MODE have to come back, which is not compatible with 360K floppies. So perhaps a more realistic approach would be to make EN-only sets harsher than they are today and make them support only strictly the US-keyboard layout.

[mateuszviste]

The error about DOSDIR being undefined is no longer output by SvarCOM.
TODO: remove keyboard and codepage setup from the SvarDOS installer when it runs in "EN-only" mode.

[mateuszviste]

fixed: when run in "EN-only" mode, install does not configure any codepage nor keyboard layout.