diff --git a/sys/src/games/md/cpu.c b/sys/src/games/md/cpu.c
deleted file mode 100644
index 6a223c3b1..000000000
--- a/sys/src/games/md/cpu.c
+++ /dev/null
@@ -1,1185 +0,0 @@
-#include <u.h>
-#include <libc.h>
-#include <thread.h>
-#include "../eui.h"
-#include "dat.h"
-#include "fns.h"
-
-enum {
-	FLAGS = 1<<13,
-	FLAGX = 16,
-	FLAGN = 8,
-	FLAGZ = 4,
-	FLAGV = 2,
-	FLAGC = 1,
-};
-
-u32int r[16], pc, curpc;
-u32int asp, irq, stop;
-extern u32int irql[8];
-u32int irqla[8];
-u16int rS;
-static u32int op;
-int tim;
-#define ra (r+8)
-
-static void
-undef(void)
-{
-	sysfatal("undefined opcode %#o at pc=%#.6x", op, curpc);
-}
-
-static u16int
-fetch16(void)
-{
-	u16int v;
-	
-	v = memread(pc);
-	pc += 2;
-	return v;
-}
-
-static u32int
-fetch32(void)
-{
-	u32int v;
-	
-	v = fetch16() << 16;
-	return v | fetch16();
-}
-
-static void
-push16(u16int u)
-{
-	ra[7] -= 2;
-	memwrite(ra[7], u, -1);
-}
-
-static u16int
-pop16(void)
-{
-	u16int v;
-	
-	v = memread(ra[7]);
-	ra[7] += 2;
-	return v;
-}
-
-static void
-push32(u32int u)
-{
-	ra[7] -= 4;
-	memwrite(ra[7], u >> 16, -1);
-	memwrite(ra[7] + 2, u, -1);
-}
-
-static u32int
-pop32(void)
-{
-	u32int v;
-	v = memread(ra[7]) << 16;
-	v |= memread(ra[7] + 2);
-	ra[7] += 4;
-	return v;
-}
-
-static vlong
-amode(int m, int n, int s)
-{
-	u16int w;
-	u32int v;
-	
-	m &= 7;
-	n &= 7;
-	s &= 3;
-	if(n == 7 && s == 0)
-		s++;
-	switch(m){
-	case 0:
-		return ~n;
-	case 1:
-		return ~(n+8);
-	case 2:
-		tim += s == 2 ? 8 : 4;
-		return ra[n];
-	case 3:
-		v = ra[n];
-		ra[n] += 1<<s;
-		tim += s == 2 ? 8 : 4;
-		return v;
-	case 4:
-		tim += s == 2 ? 10 : 6;
-		return ra[n] -= 1<<s;
-	case 5:
-		tim += s == 2 ? 12 : 8;
-		return (u32int)(ra[n] + (s16int)fetch16());
-	case 6:
-		tim += s == 2 ? 14 : 10;
-		w = fetch16();
-		v = r[w >> 12];
-		if((w & 1<<11) == 0)
-			v = (s16int)v;
-		return (u32int)(ra[n] + v + (s8int)w);
-	case 7:
-		switch(n){
-		case 0:
-			tim += s == 2 ? 12 : 8;
-			return (u32int)(s16int)fetch16();
-		case 1:
-			tim += s == 2 ? 16 : 12;
-			return fetch32();
-		case 2:
-			tim += s == 2 ? 12 : 8;
-			v = fetch16();
-			return (u32int)(pc + (s16int)v - 2);
-		case 3:
-			tim += s == 2 ? 14 : 4;
-			w = fetch16();
-			v = r[w >> 12];
-			if((w & 1<<11) == 0)
-				v = (s16int)v;
-			return (u32int)(pc + v + (s8int)w - 2);
-		case 4:
-			tim += s == 2 ? 8 : 4;
-			v = pc;
-			pc += 1<<s;
-			if(s == 0)
-				v = pc++;
-			return v;
-		default:
-			undef();
-		}
-	default:
-		undef();
-	}
-	return 0;
-}
-
-static u32int
-rmode(vlong a, int s)
-{
-	u32int v;
-
-	if(a >= 0){
-		switch(s & 3){
-		case 0:
-			v = memread(a);
-			if((a & 1) == 0)
-				v >>= 8;
-			return (s8int) v;
-		default:
-			return (s16int) memread(a);
-		case 2:
-			v = memread(a) << 16;
-			return v | memread(a + 2);
-		}
-	}
-	v = r[~a];
-	switch(s & 3){
-	case 0: return (s8int) v;
-	case 1: return (s16int) v;
-	default: return v;
-	}
-}
-
-static void
-wmode(vlong a, int s, u32int v)
-{
-	int n;
-
-	if(a >= 0){
-		switch(s & 3){
-		case 0:
-			memwrite(a, (u8int)v | (u8int)v << 8, (a & 1) != 0 ? 0xff : 0xff00);
-			return;
-		default:
-			memwrite(a, v, -1);
-			return;
-		case 2:
-			memwrite(a, v >> 16, -1);
-			memwrite(a + 2, v, -1);
-			return;
-		}
-	}
-	n = ~a;
-	if(n < 8){
-		switch(s){
-		case 0: r[n] = r[n] & 0xffffff00 | v & 0xff; break;
-		case 1: r[n] = r[n] & 0xffff0000 | v & 0xffff; break;
-		default: r[n] = v;
-		}
-	}else{
-		if(s == 1)
-			v = (s16int) v;
-		r[n] = v;
-	}
-}
-
-static void
-nz(u32int v, int s)
-{
-	switch(s){
-	case 0: v = (s8int) v; break;
-	case 1: v = (s16int) v; break;
-	}
-	rS &= ~(FLAGC|FLAGN|FLAGV|FLAGZ);
-	if(v == 0)
-		rS |= FLAGZ;
-	if((s32int)v < 0)
-		rS |= FLAGN;
-}
-
-static u32int
-add(u32int u, u32int w, int c, int s)
-{
-	u64int v;
-
-	rS &= ~(FLAGN|FLAGV|FLAGC);
-	switch(s){
-	case 0:
-		v = (u8int)w + (u8int)u + c;
-		if(v >= 0x100)
-			rS |= FLAGC;
-		if((v & 0x80) != 0)
-			rS |= FLAGN;
-		if((~(w ^ u) & (v ^ u) & 0x80) != 0)
-			rS |= FLAGV;
-		if((u8int)v != 0)
-			rS &= ~FLAGZ;
-		break;
-	case 1:
-		v = (u16int)w + (u16int)u + c;
-		if(v >= 0x10000)
-			rS |= FLAGC;
-		if((v & 0x8000) != 0)
-			rS |= FLAGN;
-		if((~(w ^ u) & (v ^ u) & 0x8000) != 0)
-			rS |= FLAGV;
-		if((u16int)v != 0)
-			rS &= ~FLAGZ;
-		break;
-	default:
-		v = (u64int)w + u + c;
-		if((v >> 32) != 0)
-			rS |= FLAGC;
-		if((v & 0x80000000) != 0)
-			rS |= FLAGN;
-		if((~(w ^ u) & (v ^ u) & 0x80000000) != 0)
-			rS |= FLAGV;
-		if((u32int)v != 0)
-			rS &= ~FLAGZ;
-		break;
-	}
-	return v;
-} 
-
-static u32int
-sub(u32int u, u32int w, int c, int s)
-{
-	u64int v;
-
-	rS &= ~(FLAGN|FLAGV|FLAGC);
-	switch(s){
-	case 0:
-		v = (u8int)u - (u8int)w - c;
-		if(v >= 0x100)
-			rS |= FLAGC;
-		if((v & 0x80) != 0)
-			rS |= FLAGN;
-		if(((w ^ u) & (v ^ u) & 0x80) != 0)
-			rS |= FLAGV;
-		if((u8int)v != 0)
-			rS &= ~FLAGZ;
-		break;
-	case 1:
-		v = (u16int)u - (u16int)w - c;
-		if(v >= 0x10000)
-			rS |= FLAGC;
-		if((v & 0x8000) != 0)
-			rS |= FLAGN;
-		if(((w ^ u) & (v ^ u) & 0x8000) != 0)
-			rS |= FLAGV;
-		if((u16int)v != 0)
-			rS &= ~FLAGZ;
-		break;
-	default:
-		v = (u64int)u - w - c;
-		if((v >> 32) != 0)
-			rS |= FLAGC;
-		if((v & 0x80000000) != 0)
-			rS |= FLAGN;
-		if(((w ^ u) & (v ^ u) & (1<<31)) != 0)
-			rS |= FLAGV;
-		if((u32int)v != 0)
-			rS &= ~FLAGZ;
-		break;
-	}
-	return v;
-}
-
-static int
-cond(int n)
-{
-	switch(n){
-	case 0: return 1; break;
-	default: return 0; break;
-	case 2: return (rS & (FLAGC|FLAGZ)) == 0; break;
-	case 3: return (rS & (FLAGC|FLAGZ)) != 0; break;
-	case 4: return (rS & FLAGC) == 0; break;
-	case 5: return (rS & FLAGC) != 0; break;
-	case 6: return (rS & FLAGZ) == 0; break;
-	case 7: return (rS & FLAGZ) != 0; break;
-	case 8: return (rS & FLAGV) == 0; break;
-	case 9: return (rS & FLAGV) != 0; break;
-	case 10: return (rS & FLAGN) == 0; break;
-	case 11: return (rS & FLAGN) != 0; break;
-	case 12: return ((rS ^ (rS << 2)) & FLAGN) == 0; break;
-	case 13: return ((rS ^ (rS << 2)) & FLAGN) != 0; break;
-	case 14: return ((rS ^ (rS << 2)) & FLAGN) == 0 && (rS & FLAGZ) == 0; break;
-	case 15: return ((rS ^ (rS << 2)) & FLAGN) != 0 || (rS & FLAGZ) != 0; break;
-	}
-}
-
-static u32int
-rot(u32int v, int m, int n, int s)
-{
-	int l, ll, x, vf;
-	u32int msb;
-	
-	msb = 1 << ((8 << s) - 1);
-	v &= (msb << 1) - 1;
-	if(m == 0)
-		x = (v & msb) != 0;
-	else
-		x = 0;
-	if((m & 6) == 4)
-		ll = l = (rS & FLAGX) != 0;
-	else
-		ll = l = 0;
-	vf = 0;
-	while(n--){
-		if((m & 1) == 0){
-			l = v & 1;
-			v >>= 1;
-		}else{
-			l = (v & msb) != 0;
-			v <<= 1;
-		}
-		rS = rS & ~FLAGX | l << 4;
-		if(m >= 6)
-			x = l;
-		else if(m >= 4){
-			x = ll;
-			ll = l;
-		}
-		if((m & 1) == 0){
-			if(x != 0)
-				v |= msb;
-		}else
-			v |= x;
-		vf |= x ^ (v & msb) != 0;
-		tim += 2;
-	}
-	nz(v, s);
-	rS |= l;
-	if(m <= 1 && vf)
-		rS |= FLAGV;
-	tim += s == 2 ? 8 : 6;
-	return v;
-}
-
-static u8int
-addbcd(u8int a, u8int b)
-{
-	int r;
-	
-	r = (a & 0xf) + (b & 0xf) + ((rS & FLAGX) != 0);
-	if(r > 0x09) r += 0x06;
-	if(r > 0x1f) r -= 0x10;
-	r += (a & 0xf0) + (b & 0xf0);
-	if(r > 0x9f) r += 0x60;
-	if((u8int)r != 0)
-		rS &= ~FLAGZ;
-	if(r > 0xff)
-		rS |= FLAGC|FLAGX;
-	else
-		rS &= ~(FLAGC|FLAGX);
-	return r;
-}
-
-static u8int
-subbcd(u8int a, u8int b)
-{
-	int x;
-	
-	x = (a & 0xf) + (~b & 0xf) + ((rS & FLAGX) == 0);
-	if(x < 0x10) x -= 0x06;
-	if(x < 0) x += 0x10;
-	x += (a & 0xf0) + (~b & 0xf0);
-	if(x > 0xff)
-		rS &= ~(FLAGC|FLAGX);
-	else{
-		rS |= FLAGC|FLAGX;
-		x -= 0x60;
-	}
-	if((u8int)x != 0)
-		rS &= ~FLAGZ;
-	return x;
-}
-
-static void
-dtime(u16int op, u8int s)
-{
-	if((op & 0x100) != 0){
-		if(s == 2)
-			if((op & 0x30) == 0 || (op & 0x3f) == 0x3c)
-				tim += 8;
-			else
-				tim += 6;
-		else
-			tim += 4;
-	}else
-		tim += s == 2 ? 12 : 8;
-}
-
-static void
-stime(int a, u8int s)
-{
-	if(a)
-		tim += s == 2 ? 6 : 4;
-	else
-		tim += s == 2 ? 12 : 8;
-}
-
-static void
-trap(int n, u32int pcv)
-{
-	int l, v;
-	u32int sr, t;
-	
-	sr = rS;
-	if(n < 0){
-		for(l = 7; l > ((rS >> 8) & 7); l--)
-			if((irql[l] & irq) != 0)
-				break;
-		v = intack(l);
-		rS = rS & ~0x700 | l << 8;
-		tim += 44;
-	}else{
-		switch(n){
-		case 2: case 3: tim += 50; break;
-		case 5: tim += 38; break;
-		case 6: tim += 40; break;
-		default: tim += 34; break;
-		}
-		v = n;
-	}
-	if((rS & FLAGS) == 0){
-		t = asp;
-		asp = ra[7];
-		ra[7] = t;
-	}
-	rS |= FLAGS;
-	push32(pcv);
-	push16(sr);
-	pc = memread(v * 4) << 16;
-	pc |= memread(v * 4 + 2);
-	stop = 0;
-}
-
-void
-cpureset(void)
-{
-	u32int v;
-	int i;
-
-	ra[7] = memread(0) << 16 | memread(2);
-	pc = memread(4) << 16 | memread(6);
-	rS = 0x2700;
-	for(i = 7, v = 0; i >= 0; i--){
-		irqla[i] = v;
-		v |= irql[i];
-	}
-}
-
-int
-step(void)
-{
-	u32int v, w;
-	vlong a;
-	int s;
-	int n, m, d;
-	static int cnt;
-
-	if(0 && pc == 0x4118c){
-		trace++;
-		print("%x\n", curpc);
-	}
-	tim = 0;
-	curpc = pc;
-	if(irq && (irqla[(rS >> 8) & 7] & irq) != 0){
-		trap(-1, curpc);
-		return tim;
-	}
-	if(stop)
-		return 1;
-	op = fetch16();
-	if(trace)
-		print("%.6ux %.6uo %.4ux %.8ux | %.8ux %.8ux %.8ux %.8ux | %.8ux %.8ux %.8ux\n", curpc, op, rS, memread(ra[7])<<16|memread(ra[7]+2), r[0], r[1], r[2], r[3], ra[0], ra[6], ra[7]);
-	s = op >> 6 & 3;
-	n = op >> 9 & 7;
-	switch(op >> 12){
-	case 0:
-		if((op & 0x3f) == 0x3c){ /* (ORI|ANDI|EORI) to (CCR|SR) */
-			if(s == 1 && (rS & FLAGS) == 0){
-				trap(8, curpc);
-				break;
-			}
-			v = rS;
-			w = fetch16();
-			switch(n){
-			case 0: v |= w; break;
-			case 1: v &= w; break;
-			case 5: v ^= w; break;
-			default: undef();
-			}
-			if(s != 1)
-				v = v & 0xff | rS & 0xff00;
-			rS = v;
-			if(s == 1 && (rS & FLAGS) == 0){
-				v = ra[7];
-				ra[7] = asp;
-				asp = v;
-			}
-			tim += 20;
-			break;
-		}
-		if((op & 0x138) == 0x108){ /* MOVEP */
-			a = ra[op & 7] + (s16int)fetch16();
-			switch(s){
-			case 0:
-				v = (u8int)rmode(a, 0) << 8;
-				v |= (u8int)rmode(a + 2, 0);
-				r[n] = r[n] & 0xff00 | v;
-				tim += 16;
-				break;
-			case 1:
-				v = (u8int)rmode(a, 0) << 24;
-				v |= (u8int)rmode(a + 2, 0) << 16;
-				v |= (u8int)rmode(a + 4, 0) << 8;
-				v |= (u8int)rmode(a + 6, 0);
-				tim += 24;
-				r[n] = v;
-				break;
-			case 2:
-				wmode(a, 0, r[n] >> 8);
-				wmode(a + 2, 0, r[n]);
-				tim += 16;
-				break;
-			case 3:
-				wmode(a, 0, r[n] >> 24);
-				wmode(a + 2, 0, r[n] >> 16);
-				wmode(a + 4, 0, r[n] >> 8);
-				wmode(a + 6, 0, r[n]);
-				tim += 24;
-				break;
-			}
-			break;
-		}
-		if((op & 0x100) != 0 || n == 4){ /* BTST, BCHG, BCLR, BSET */
-			if((op & 0x100) != 0)
-				w = r[n];
-			else
-				w = fetch16();
-			if((op & 0x38) != 0){
-				n = 0;
-				w = 1<<(w & 7);
-			}else{
-				n = 2;
-				w = 1<<(w & 31);
-			}
-			a = amode(op >> 3, op, n);
-			v = rmode(a, n);
-			rS &= ~FLAGZ;
-			if((v & w) == 0)
-				rS |= FLAGZ;
-			switch(s){
-			case 1: v ^= w; break;
-			case 2: v &= ~w; if(n == 2) tim += 2; break;
-			case 3: v |= w; break;
-			}
-			if(s != 0){
-				wmode(a, n, v);
-				tim += (op & 0x100) != 0 ? 8 : 12;
-			}else{
-				tim += (op & 0x100) != 0 ? 4 : 8;
-				if(n == 2)
-					tim += 2;
-			}
-			break;
-		}
-		switch(s){
-		case 0: w = (s8int)fetch16(); break;
-		default: w = fetch16(); break;
-		case 2: w = fetch32(); break;
-		}
-		a = amode(op >> 3, op, s);
-		v = rmode(a, s);
-		switch(n){
-		case 0: nz(v |= w, s); break;
-		case 1: nz(v &= w, s); break;
-		case 2: rS |= FLAGZ; v = sub(v, w, 0, s); break;
-		case 3: rS |= FLAGZ; v = add(v, w, 0, s); break;
-		case 5: nz(v ^= w, s); break;
-		case 6: rS |= FLAGZ; sub(v, w, 0, s); break;
-		default: undef();
-		}
-		if(a < 0)
-			tim += s == 2 ? (n == 1 || n == 6 ? 14 : 16) : 8;
-		else
-			tim += s == 2 ? 20 : 12;
-		if(n != 6)
-			wmode(a, s, v);
-		break;
-	case 1: /* MOVE */
-		s = 0;
-		goto move;
-	case 2:
-		s = 2;
-		goto move;
-	case 3:
-		s = 1;
-	move:
-		v = rmode(amode(op >> 3, op, s), s);
-		wmode(amode(op >> 6, op >> 9, s), s, v);
-		if((op & 0x1c0) != 0x40)
-			nz(v, s);
-		tim += 4;
-		break;
-	case 4:
-		if((op & 0x1c0) == 0x1c0){ /* LEA */
-			ra[n] = amode(op >> 3, op, 2);
-			break;
-		}
-		if((op & 0x1c0) == 0x180){ /* CHK */
-			a = amode(op >> 3, op, s);
-			v = rmode(a, s);
-			if((s32int)r[n] < 0 || (s32int)r[n] > (s32int)v)
-				trap(6, curpc);
-			else
-				tim += 10;
-		}
-		if((op & 0xb80) == 0x880 && (op & 0x38) >= 0x10){ /* MOVEM */
-			s = (op >> 6 & 1) + 1;
-			w = fetch16();
-			if((op & 0x38) == 0x18){
-				n = op & 7;
-				a = ra[n];
-				for(m = 0; m < 16; m++){
-					if((w & 1) != 0){
-						r[m] = rmode(a, s);
-						a += 1<<s;
-						tim += 2<<s;
-					}
-					w >>= 1;
-				}
-				ra[n] = a;
-				tim += 12;
-				break;
-			}
-			if((op & 0x38) == 0x20){
-				n = op & 7;
-				a = ra[n];
-				for(m = 0; m < 16; m++){
-					if((w & 1) != 0){
-						a -= 1<<s;
-						wmode(a, s, r[15 - m]);
-						tim += 2<<s;
-					}
-					w >>= 1;
-				}
-				ra[n] = a;
-				tim += 8;
-				break;
-			}
-			a = amode(op >> 3, op, s);
-			for(m = 0; m < 16; m++){
-				if((w & 1) != 0){
-					if((op & 0x400) != 0)
-						r[m] = rmode(a, s);
-					else
-						wmode(a, s, r[m]);
-					a += 1<<s;
-					tim += 2<<s;
-				}
-				w >>= 1;
-			}
-			tim += (op & 0x400) != 0 ? 8 : 12;
-			break;
-		}
-		switch(op >> 8 & 0xf){
-		case 0:
-			if(s == 3){ /* MOVE from SR */
-				if((rS & FLAGS) != 0){
-					a = amode(op >> 3, op, 1);
-					wmode(a, 1, rS);
-					tim += a < 0 ? 6 : 8;
-				}else
-					trap(8, curpc);
-				break;
-			} /* NEGX */
-			a = amode(op >> 3, op, s);
-			m = (rS & FLAGX) != 0;
-			d = 1<<(8<<s)-1;
-			v = rmode(a, s);
-			w = -(v+m) & (d << 1) - 1;
-			rS &= ~(FLAGC|FLAGX|FLAGN|FLAGV);
-			if((w & d) != 0)
-				rS |= FLAGN;
-			if(m && w == d)
-				rS |= FLAGV;
-			if(w != 0){
-				rS |= FLAGC|FLAGX;
-				rS &= ~FLAGZ;
-			}
-			wmode(a, s, w);
-			stime(a < 0, s);
-			break;
-		case 2: /* CLR */
-			a = amode(op >> 3, op, s);
-			wmode(a, s, 0);
-			nz(0, 0);
-			stime(a < 0, s);
-			break;
-		case 4:
-			if(s == 3){ /* MOVE to CCR */
-				rS = rS & 0xff00 | rmode(amode(op >> 3, op, 1), 1);
-				tim += 12;
-				break;
-			} /* NEG */
-			a = amode(op >> 3, op, s);
-			v = -rmode(a, s);
-			nz(v, s);
-			rS = rS & ~FLAGX | ~rS << 2 & FLAGX | ~rS >> 2 & FLAGC;
-			wmode(a, s, v);
-			stime(a < 0, s);
-			break;
-		case 6:
-			if(s == 3){ /* MOVE to SR */
-				if((rS & FLAGS) != 0){
-					rS = rmode(amode(op >> 3, op, 1), 1);
-					if((rS & FLAGS) == 0){
-						v = asp;
-						asp = ra[7];
-						ra[7] = v;
-					}
-					tim += 12;
-				}else
-					trap(8, curpc);
-				break;
-			} /* NOT */
-			a = amode(op >> 3, op, s);
-			v = ~rmode(a, s);
-			nz(v, s);
-			wmode(a, s, v);
-			stime(a < 0, s);
-			break;
-		case 8:
-			n = op & 7;
-			switch(s){
-			case 0: /* NBCD */
-				a = amode(op >> 3, op, 0);
-				v = rmode(a, 0);
-				wmode(a, 0, subbcd(0, v));
-				if(a < 0)
-					tim += 8;
-				else
-					tim += 6;
-				break;
-			case 1:
-				if((op >> 3 & 7) != 0){
-					push32(amode(op >> 3, op, 0)); /* PEA */
-					tim += 8;
-				}else{
-					nz(r[n] = r[n] >> 16 | r[n] << 16, 2); /* SWAP */
-					tim += 4;
-				}
-				break;
-			case 2: /* EXT */
-				nz(r[n] = r[n] & 0xffff0000 | (u16int)(s8int)r[n], 1);
-				tim += 4;
-				break;
-			case 3: /* EXT */
-				nz(r[n] = (s16int)r[n], 2);
-				tim += 4;
-				break;
-			}
-			break;
-		case 10:
-			if(s == 3){ /* TAS */
-				a = amode(op >> 3, op, 0);
-				v = rmode(a, 0);
-				nz(v, 0);
-				wmode(a, s, v | 0x80);
-				tim += a < 0 ? 4 : 14;
-				break;
-			} /* TST */
-			a = amode(op >> 3, op, s);
-			nz(rmode(a, s), s);
-			tim += 4;
-			break;
-		case 14:
-			v = op >> 4 & 0xf;
-			n = op & 7;
-			if(v == 4){ /* TRAP */
-				trap(0x20 | op & 0xf, pc);
-				break;
-			}else if(v == 5){
-				if((op & 8) == 0){ /* LINK */
-					push32(ra[n]);
-					ra[n] = ra[7];
-					ra[7] += (s16int)fetch16();
-					tim += 16;
-				}else{ /* UNLK */
-					ra[7] = ra[n];
-					ra[n] = pop32();
-					tim += 12;
-				}
-				break;
-			}else if(v == 6){ /* MOVE USP */
-				if((rS & FLAGS) != 0){
-					if((op & 8) != 0)
-						ra[n] = asp;
-					else
-						asp = ra[n];
-					tim += 4;
-				}else
-					trap(8, curpc);
-				break;
-			}
-			if((op & 0xc0) == 0xc0){ /* JMP */
-				pc = amode(op >> 3, op, 2);
-				tim += 4;
-				break;
-			}
-			if((op & 0xc0) == 0x80){ /* JSR */
-				a = amode(op >> 3, op, 2);
-				push32(pc);
-				pc = a;
-				tim += 12;
-				break;
-			}
-			switch(op){
-			case 0x4e70: tim += 132; break; /* RESET */
-			case 0x4e71: tim += 4; break; /* NOP */
-			case 0x4e72: /* STOP */
-				if((rS & FLAGS) != 0){
-					rS = fetch16();
-					stop = 1;
-				}else
-					trap(8, curpc);
-				tim += 4;
-				break;
-			case 0x4e73: /* RTE */
-				if((rS & FLAGS) != 0){
-					v = rS;
-					rS = pop16();
-					pc = pop32();
-					if(((v ^ rS) & FLAGS) != 0){
-						v = asp;
-						asp = ra[7];
-						ra[7] = v;
-					}
-					tim += 20;
-				}else
-					trap(8, curpc);
-				break;
-			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 | pop16() & 0xff;
-				pc = pop32();
-				tim += 20;
-				break;
-			default: undef();
-			}
-			break;
-		default:
-			undef();
-		}
-		break;
-	case 5:
-		if((op & 0xf8) == 0xc8){ /* DBcc */
-			n = op & 7;
-			v = (s16int)fetch16();
-			if(!cond((op >> 8) & 0xf)){
-				if((u16int)r[n] != 0){
-					r[n]--;
-					pc = pc + v - 2;
-					tim += 10;
-				}else{
-					r[n] |= 0xffff;
-					tim += 14;
-				}
-			}else
-				tim += 12;
-			break;
-		}
-		if(s == 3){ /* Scc */
-			a = amode(op >> 3, op, 0);
-			v = cond(op >> 8 & 0xf);
-			wmode(a, 0, -v);
-			if(a < 0)
-				tim += 4 + 2 * v;
-			else
-				tim += 8;
-			break;
-		} /* ADDQ, SUBQ */
-		rS |= FLAGZ;
-		if((op & 0x38) == 0x08)
-			s = 2;
-		a = amode(op >> 3, op, s);
-		v = rmode(a, s);
-		if(n == 0)
-			n = 8;
-		if((op & 0x100) == 0)
-			v = add(v, n, 0, s);
-		else
-			v = sub(v, n, 0, s);
-		rS = rS & ~FLAGX | rS << 4 & FLAGX;
-		if(a < 0)
-			tim += s == 2 || (op & 0x130) == 0x110 ? 8 : 4;
-		else
-			tim += s == 2 ? 12 : 8;
-		wmode(a, s, v);
-		break;
-	case 6: /* BRA */
-		v = (s8int)op;
-		if(v == 0)
-			v = (s16int)fetch16();
-		else if(v == (u32int)-1)
-			v = fetch32();
-		if((op & 0xf00) == 0x100){ /* BSR */
-			push32(pc);
-			pc = curpc + 2 + v;
-			tim += 18;
-			break;
-		}
-		if(cond((op >> 8) & 0xf)){
-			pc = curpc + 2 + v;
-			tim += 10;
-		}else
-			tim += (u8int)(op + 1) <= 1 ? 12 : 8;
-		break;
-	case 7: /* MOVEQ */
-		r[n] = (s8int)op;
-		nz(r[n], 0);
-		tim += 4;
-		break;
-	case 8:
-		if(s == 3){ /* DIVU, DIVS */
-			a = amode(op >> 3, op, 1);
-			v = rmode(a, 1);
-			if(v == 0){
-				trap(5, curpc);
-				break;
-			}
-			if((op & 0x100) != 0){
-				w = (s32int)r[n] % (s16int)v;
-				v = (s32int)r[n] / (s16int)v;
-				if(((s16int)w ^ (s16int)v) < 0)
-					w = -w;
-				if(v != (u32int)(s16int)v){
-					rS = rS & ~FLAGC | FLAGV;
-					break;
-				}
-				tim += 158;
-			}else{
-				w = r[n] % (u16int)v;
-				v = r[n] / (u16int)v;
-				if(v >= 0x10000){
-					rS = rS & ~FLAGC | FLAGV;
-					break;
-				}
-				tim += 140;
-			}
-			r[n] = (u16int)v | w << 16;
-			nz(v, 1);
-			break;
-		}
-		if((op & 0x1f0) == 0x100){ /* SBCD */
-			n = (op >> 9) & 7;
-			m = op & 7;
-			if((op & 8) != 0){
-				a = amode(4, n, 0);
-				v = rmode(a, 0);
-				w = rmode(amode(4, m, 0), 0);
-				v = subbcd(v, w);
-				wmode(a, 0, v);
-				tim += 18;
-			}else{
-				r[n] = r[n] & 0xffffff00 | subbcd((u8int)r[n], (u8int)r[m]);
-				tim += 6;
-			}
-			break;
-		}
-	logic: /* OR, EOR, AND */
-		a = amode(op >> 3, op, s);
-		n = (op >> 9) & 7;
-		v = rmode(a, s);
-		switch(op >> 12){
-		case 8: v |= r[n]; break;
-		case 11: v ^= r[n]; break;
-		case 12: v &= r[n]; break;
-		}
-		if((op & 0x100) == 0)
-			a = ~n;
-		wmode(a, s, v);
-		nz(v, s);
-		dtime(op, s);
-		break;
-	case 11:
-		if(s == 3){ /* CMPA */
-			s = (op >> 8 & 1) + 1;
-			a = amode(op >> 3, op, s);
-			rS |= FLAGZ;
-			sub(ra[n], rmode(a, s), 0, 2);
-			tim += 6;
-			break;
-		}
-		if((op & 0x138) == 0x108){ /* CMPM */
-			m = op & 7;
-			rS |= FLAGZ;
-			sub(rmode(amode(3, n, s), s), rmode(amode(3, m, s), s), 0, s);
-			tim += s == 2 ? 20 : 12;
-			break;
-		}
-		if((op & 0x100) == 0){ /* CMP */
-			a = amode(op >> 3, op, s);
-			rS |= FLAGZ;
-			sub(r[n], rmode(a, s), 0, s);
-			tim += s == 2 ? 6 : 4;
-			break;
-		}
-		goto logic;
-	case 12:
-		if(s == 3){ /* MULU, MULS */
-			a = amode(op >> 3, op, 1);
-			v = rmode(a, 1);
-			if((op & 0x100) != 0)
-				v *= (s16int)r[n];
-			else
-				v = (u16int)v * (u16int)r[n];
-			r[n] = v;
-			nz(v, 1);
-			tim += 70;
-			break;
-		}
-		if((op & 0x1f0) == 0x100){ /* ABCD */
-			n = (op >> 9) & 7;
-			m = op & 7;
-			if((op & 8) != 0){
-				a = amode(4, n, 0);
-				v = rmode(a, 0);
-				w = rmode(amode(4, m, 0), 0);
-				v = addbcd(v, w);
-				wmode(a, 0, v);
-				tim += 18;
-			}else{
-				r[n] = r[n] & 0xffffff00 | addbcd((u8int)r[n], (u8int)r[m]);
-				tim += 6;
-			}
-			break;
-		
-		}
-		if((op & 0x130) == 0x100){ /* EXG */
-			m = op & 0xf;
-			if((op & 0xc8) == 0x48)
-				n |= 8;
-			v = r[n];
-			r[n] = r[m];
-			r[m] = v;
-			tim += 6;
-			break;
-		}
-		goto logic;
-	case 9:
-	case 13:
-		if(s == 3){ /* ADDA, SUBA */
-			if((op & 0x100) != 0){
-				s = 2;
-				tim += 6;
-			}else{
-				s = 1;
-				tim += 8;
-			}
-			a = amode(op >> 3, op, s);
-			if((op >> 12) == 13)
-				ra[n] += rmode(a, s);
-			else
-				ra[n] -= rmode(a, s);
-			break;
-		}
-		if((op & 0x130) == 0x100){ /* ADDX, SUBX */
-			m = op & 7;
-			if((op & 8) != 0){
-				a = ra[n] -= 1<<s;
-				v = rmode(a, s);
-				w = rmode(ra[m] -= 1<<s, s);
-				tim += s == 2 ? 30 : 18;
-			}else{
-				v = r[n];
-				w = r[m];
-				a = ~n;
-				tim += s == 2 ? 8 : 4;
-			}
-			if((op >> 12) == 13)
-				v = add(v, w, (rS & FLAGX) != 0, s);
-			else
-				v = sub(v, w, (rS & FLAGX) != 0, s);
-			wmode(a, s, v);
-			rS = rS & ~FLAGX | rS << 4 & FLAGX;
-			break;
-		} /* ADD, SUB */
-		a = amode(op >> 3, op, s);
-		rS |= FLAGZ;
-		d = (op & 0x100) == 0;
-		v = rmode(a, s);
-		if((op >> 12) == 13)
-			v = add(v, r[n], 0, s);
-		else
-			v = sub(d ? r[n] : v, d ? v : r[n], 0, s);
-		rS = rS & ~FLAGX | rS << 4 & FLAGX;
-		if(d)
-			a = ~n;
-		wmode(a, s, v);
-		dtime(op, s);
-		break;
-	case 14: /* shifts */
-		if(s == 3){
-			m = op >> 8 & 7;
-			n = 1;
-			s = 1;
-			a = amode(op >> 3, op, s);
-		}else{
-			a = ~(uvlong)(op & 7);
-			m = op >> 2 & 6 | op >> 8 & 1;
-			n = (op >> 9) & 7;
-			if((op & 0x20) != 0)
-				n = r[n] & 63;
-			else if(n == 0)
-				n = 8;
-		}
-		wmode(a, s, rot(rmode(a, s), m, n, s));
-		break;
-	case 10:
-		trap(10, curpc);
-		break;
-	case 15:
-		trap(11, curpc);
-		break;
-	default:
-		undef();
-	}
-	return tim;
-}
diff --git a/sys/src/games/md/mkfile b/sys/src/games/md/mkfile
index 7cad014fc..42a906cf3 100644
--- a/sys/src/games/md/mkfile
+++ b/sys/src/games/md/mkfile
@@ -3,7 +3,7 @@
 BIN=/$objtype/bin/games
 TARG=md
 OFILES=\
-	cpu.$O\
+	../blit/cpu.$O\
 	mem.$O\
 	md.$O\
 	vdp.$O\