ISACRTCR
temp = (ISACRTCR(VSYNCE) & 0x7f);
temp = (ISACRTCR(VSYNCE) & 0xf0);
temp = (ISACRTCR(VSYNCE) & 0x7f);
temp = (ISACRTCR(OVERFLOW) & ~0x52);
temp = (ISACRTCR(MAXSCLIN) & ~0x40);
temp = (ISACRTCR(VEXT) & ~0x02);