I'm wondering why execution of basic gfx command is so slow on screen 3.... the entire screen is only 1536bytes.
CIRCLE PAINT commands are orribly slow.... anyone know about bios routines?
Not sure, maybe their could be treating the screen as 256x192 pixels wide and pre-empting the redundant points with blocks ... Anyway, it is not recommended to point or link to MSX-BASIC BIOS since their could change from each manufacture version. Only the first calls of the MSX-BIOS that are standardised, not the routines.
Some books have some references to "256x192" pixels wide ... The points in the screen could consist of bigger monochromatic blocks .