--- xmil/io/crtc.c	2004/08/13 01:35:59	1.11
+++ xmil/io/crtc.c	2004/08/13 02:16:33	1.12
@@ -172,6 +172,10 @@ void crtc_regupdate(void) {
 
 	fontyclock = fonty * RASTER_CLOCK;
 	crtc.e.dispclock = fontyclock * crtc.e.yl;
+	// YsIIIが yl==0で disp信号見る…なんで？
+	if (!crtc.e.dispclock) {
+		crtc.e.dispclock = fontyclock;
+	}
 	crtc.e.vsyncstart = fontyclock * ((crtc.s.reg[CRTCREG_VSYNC] & 0x7f) + 1);
 	crtc.e.vpulseclock = (crtc.s.reg[CRTCREG_PULSE] >> 4) * RASTER_CLOCK;
 	crtc.e.vl = fonty * ((crtc.s.reg[CRTCREG_VSIZE] & 0x7f) + 1)