VGA_CRTC_H_SYNC_START
wreg_crt(cirrus, VGA_CRTC_H_SYNC_START, hsyncstart);
vga_wcrt(regbase, VGA_CRTC_H_SYNC_START, hsyncstart);
par->crtc[VGA_CRTC_H_SYNC_START] = (xres + right) >> 3;
reg.crt[VGA_CRTC_H_SYNC_START] = hs;
write3X4(par, VGA_CRTC_H_SYNC_START, hsyncstart & 0xFF);
par->crtc[VGA_CRTC_H_SYNC_START] = pos;
vga_io_wcrt(VGA_CRTC_H_SYNC_START, 0xff);