Disabling the splash screen turns console text yellow on black
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...when console text should default to amber on black, green on black, white on black, or Atari ST GFA BASIC white on blue.
Yep, Yellow on black is simply the default, when nothing as been printed so far. The splash screen includes a command/vt100-sequence (similar to PRINT color()) which changes the color. I think, a simple terminal reset will change it to white on black. SO yellow was on purpose, but I do not remember why. The framebuffer-routines I have written for TTconsole for TomTom devices, It has been yellow already there. See e.g.: https://wiki.openstreetmap.org/wiki/Tom_Tom_Devices
Last edit: Markus Hoffmann 2019-06-08
Yellow on black does work rather well with Basic in pop-up mode on Samsung devices, seemingly better than other text colors
BTW: The screenshot above is not from the ATARI-ST Version. I think it is AMIGA or so.
ATARI-ST hat a monochrome monitor, and the default was black text on white background.
Whoops, you're right. I never used GFA on the ST, only various languages available for the Atari 400 and 800. The original Atari 400/800 BASIC did use a slightly different white on blue though. Perhaps my first xbasic GUI program could be a console text color picker.
The precessor of GFA-BASIC was TURBO BASIC XL by the same author. I have never used it, but it was available for the ATARI (without ST).
It looks like it was back-ported to the 400/800 as Frost Basic
https://atariwiki.org/wiki/Wiki.jsp?page=TURBO-BASIC%20XL
I wish I'd heard about it. My frustrations with Atari BASIC and Action! drove me to save up for an IBM PC/AT and Microsoft's C, Basic, Borland's Turbo Pascal, Watcom Fortran, and other languages.