VGA_CRTC_H_TOTAL
wreg_crt(cirrus, VGA_CRTC_H_TOTAL, htotal);
vga_wcrt(regbase, VGA_CRTC_H_TOTAL, htotal);
par->crtc[VGA_CRTC_H_TOTAL] = (xtotal >> 3) - 5;
write3X4(par, VGA_CRTC_H_TOTAL, htotal & 0xFF);
par->crtc[VGA_CRTC_H_TOTAL] = xtotal - 5;