VGA_BASE
bm->vga_base = VGA_BASE;
g_display.gd_vgabase = VGA_BASE;
if (offset >= VGA_BASE && offset < (VGA_MAPPABLE + VGA_BASE))
return m68k_btop(sc->sc_maddr + offset - VGA_BASE);
mgx_write_vga(sc, VGA_BASE + VGA_DAC_ADDRW, idx);
mgx_write_vga(sc, VGA_BASE + VGA_DAC_PALETTE, r);
mgx_write_vga(sc, VGA_BASE + VGA_DAC_PALETTE, g);
mgx_write_vga(sc, VGA_BASE + VGA_DAC_PALETTE, b);