MGA_READ1
saved_crtcext3 = MGA_READ1(sc, MGA_CRTCEXT_DATA);
locked = MGA_READ1(sc, MGA_VGA_CRTC_DATA);
while ((int)(uint8_t)MGA_READ1(sc, MGA_FIFOSTATUS) < n)
seq1 = MGA_READ1(sc, MGA_VGA_SEQ_DATA) & ~0x20;
crtcext1 = MGA_READ1(sc, MGA_CRTCEXT_DATA) & ~0x30;
return MGA_READ1(sc, MGA_DAC_BASE + reg);