VGA_CRTC_V_TOTAL
wreg_crt(cirrus, VGA_CRTC_V_TOTAL, vtotal & 0xff);
vga_wcrt(regbase, VGA_CRTC_V_TOTAL, vtotal & 0xff);
par->crtc[VGA_CRTC_V_TOTAL] = ytotal - 2;
write3X4(par, VGA_CRTC_V_TOTAL, vtotal & 0xFF);
par->crtc[VGA_CRTC_V_TOTAL] = ytotal - 2;