VGA_CRTC_H_BLANK_END
vga_wcrt(regbase, VGA_CRTC_H_BLANK_END,
par->crtc[VGA_CRTC_H_BLANK_END] = ((xres + right + hslen) >> 3 & 0x1F)
write3X4(par, VGA_CRTC_H_BLANK_END, hblankend & 0x1F);
par->crtc[VGA_CRTC_H_BLANK_END] = (pos & 0x1F) | 0x80;