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games/md: small bug fixes

--- a/sys/src/games/md/ym.c

+++ b/sys/src/games/md/ym.c

@@ -54,7 +54,7 @@

 	if((m & 1) != 0){

 		tima = (tima + 1) & 0x3ff;

 		if(tima == 0 && (m & 4) != 0){

-			ymstat |= 2;

+			ymstat |= 1;

 			tima = ym[0x24] | ym[0x25] << 8 & 0x300;

 		}

 	}

@@ -63,7 +63,7 @@

 		if((m & 2) != 0){

 			timb++;

 			if(timb == 0 && (m & 8) != 0){

-				ymstat |= 1;

+				ymstat |= 2;

 				timb = ym[0x26];

 			}

 		}

--- a/sys/src/games/md/z80.c

+++ b/sys/src/games/md/z80.c

@@ -498,6 +498,7 @@

 	case 0x5b: a = fetch16(); s[rE] = z80read(a++); s[rD] = z80read(a); return 20;

 	case 0x6b: a = fetch16(); s[rL] = z80read(a++); s[rH] = z80read(a); return 20;

 	case 0x7b: sp = read16(fetch16()); return 20;

+	case 0x4d: spc = pop16(); return 14;

 	case 0x5e: intm = intm & 0xc0 | 2; return 8;

 	case 0x4f: return 9;

 	}