8-bit UI prototype for a custom FM-1 firmware, laid out at the real device's proportions. The screen is 240×240 at native resolution.
Every screen uses only filled rectangles, 1-bit sprites, a 5×7 bitmap font and an 8-color palette quantized to RGB565, so it ports to the ST7789 panel as is. SEL is the key and chords, ARP the arpeggiator, SEQ the 16 steps (the 16 white keys become the steps), EDIT the sound of the selected track, FX the effects, GLO the theme. ALGORITHM picks the track, PRESETS its sound, SELECT the tempo.