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games/md: small fixes

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

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

@@ -509,7 +509,7 @@

 	int n, m, d;

 	static int cnt;

-	if(0 && pc == 0x1300){

+	if(0 && pc == 0x23000000){

 		trace++;

 		print("%x\n", curpc);

 	}

@@ -894,7 +894,7 @@

 			case 0x4e75: pc = pop32(); tim += 16; break; /* RTS */

 			case 0x4e76: if((rS & FLAGV) != 0) trap(7, curpc); tim += 4; break; /* TRAPV */

 			case 0x4e77: /* RTR */

-				rS = rS & 0xff00 | fetch16() & 0xff;

+				rS = rS & 0xff00 | pop16() & 0xff;

 				pc = pop32();

 				tim += 20;

 				break;

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

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

@@ -326,7 +326,7 @@

 		if(vdpy == 0 || vdpy >= 225)

 			hctr = reg[HORCTR];

 		else

-			if(--hctr == 0){

+			if(hctr-- == 0){

 				if((reg[MODE1] & IE1) != 0)

 					irq |= INTHOR;

 				hctr = reg[HORCTR];

-- 

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