add games/blit

16 files changed, 22734 insertions, 0 deletions

diff --git a/sys/src/games/blit/blit.c b/sys/src/games/blit/blit.c
new file mode 100644
index 000000000..4fa81ae27
--- /dev/null
+++ b/sys/src/games/blit/blit.c
@@ -0,0 +1,219 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <draw.h>
+#include <keyboard.h>
+#include <mouse.h>
+#include <cursor.h>
+#include "dat.h"
+#include "fns.h"
+
+int baud = 40000;
+int scale = 1;
+Rectangle picr;
+Image *tmp, *bg;
+Channel *keych, *uartrxch, *uarttxch;
+Mousectl *mc;
+int daddr;
+u16int dstat;
+u8int invert;
+int vblctr, uartrxctr;
+Rectangle updated;
+u32int colbgv, colfgv;
+Image *colbg, *colfg;
+int realcolors;
+
+static void
+screeninit(void)
+{
+	Point p;
+
+	p = divpt(addpt(screen->r.min, screen->r.max), 2);
+	picr = (Rectangle){subpt(p, Pt(scale * SX/2, scale * SY/2)), addpt(p, Pt(scale * SX/2, scale * SY/2))};
+	if(tmp != nil) freeimage(tmp);
+	tmp = allocimage(display, Rect(0, 0, scale * SX, scale > 1 ? 1 : scale * SY), CHAN1(CMap, 1), scale > 1, 0);
+	if(bg != nil) freeimage(bg);
+	bg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, 0xCCCCCCFF);
+	colbg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, colbgv);
+	colfg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, colfgv);	
+	draw(screen, screen->r, bg, nil, ZP);
+	updated = Rect(0, 0, SX, SY);	
+}
+
+static void
+redraw(void)
+{
+	static uchar pic[SX*SY/8];
+	ushort *p;
+	uchar *q;
+	int o, n;
+	Mouse m;
+	Rectangle r;
+		
+	if(nbrecvul(mc->resizec) > 0){
+		if(getwindow(display, Refnone) < 0)
+			sysfatal("resize failed: %r");
+		screeninit();
+	}
+	while(nbrecv(mc->c, &m) > 0){
+		if(ptinrect(m.xy, picr)){
+			mousex = picr.max.x - m.xy.x - 1;
+			mousey = picr.max.y - m.xy.y - 1;
+		}
+		n = m.buttons >> 2 & 1 | m.buttons & 2 | m.buttons << 2 & 4;
+		if(n != mousebut){
+			mousebut = n;
+			irq |= INTMOUSE;
+		}
+	}
+
+	if(Dy(updated) <= 0 || Dx(updated) <= 0)
+		return;
+
+	assert(daddr + sizeof(pic) <= sizeof(ram));
+
+	r = tmp->r;
+	if(updated.min.y > r.min.y)
+		r.min.y = updated.min.y;
+	if(updated.max.y < r.max.y)
+		r.max.y = updated.max.y;
+
+	o = r.min.y*(SX/8);
+	p = ram + (daddr + o) / 2;
+	q = pic + o;
+	for(n = Dy(r)*(SX/16); --n >= 0; ){
+		*q++ = invert ^ *p >> 8;
+		*q++ = invert ^ *p++;
+	}
+
+	loadimage(tmp, r, pic+o, Dy(r)*(SX/8));
+	if(realcolors){
+		draw(screen, rectaddpt(r, picr.min), colfg, nil, r.min);
+		draw(screen, rectaddpt(r, picr.min), colbg, tmp, r.min);
+	}else
+		draw(screen, rectaddpt(r, picr.min), tmp, nil, r.min);
+	updated = Rect(SX, SY, 0, 0);
+	flushimage(display, 1);
+}
+
+static uchar
+keymap[] = {
+	[Kup-KF] 0xf1,
+	[Kdown-KF] 0xf2,
+	[Kleft-KF] 0xf3,
+	[Kright-KF] 0xf4,
+	[1] 0xf6, /* PF1 */
+	[2] 0xf7, /* PF2 */
+	[3] 0xf8, /* PF3 */
+	[4] 0xf9, /* PF4 */
+	[12] 0xfe, /* SET-UP */
+	[Kpgdown-KF] 0xb0, /* SCROLL */
+	[Kins-KF] 0xe0, /* BREAK */
+};
+
+static void
+keyproc(void *)
+{
+	int fd, cfd, ch, rc;
+	static char buf[256];
+	char *p;
+	Rune r;
+
+	fd = open("/dev/cons", OREAD);
+	if(fd < 0)
+		sysfatal("open: %r");
+	cfd = open("/dev/consctl", OWRITE);
+	if(cfd < 0)
+		sysfatal("open: %r");
+	fprint(cfd, "rawon");
+	for(;;){
+		rc = read(fd, buf, sizeof(buf) - 1);
+		if(rc <= 0)
+			sysfatal("read /dev/cons: %r");
+		for(p = buf; p < buf + rc && (p += chartorune(&r, p)); ){
+			if(r == Kend){
+				close(fd);
+				threadexitsall(nil);
+			}
+			ch = r;
+			if(ch == '\n') ch = '\r';
+			else if(ch >= KF){
+				if(ch >= KF + nelem(keymap)) continue;
+				ch = keymap[ch - KF];
+				if(ch == 0) continue;
+			}else if(ch >= 0x80) continue;
+			send(keych, &ch);
+		}
+	}
+}
+
+void
+usage(void)
+{
+	fprint(2, "usage: %s [-b baud] [-C bg,fg] [-d] [-t [net!]host[!service]]\n", argv0);
+	threadexitsall("usage");
+}
+
+void
+threadmain(int argc, char **argv)
+{
+	int n;
+	static Cursor blank;
+	char *telnet;
+	char *p;
+	extern int diag;
+	
+	telnet = nil;
+	ARGBEGIN{
+	case 'b':
+		baud = strtol(EARGF(usage()), &p, 0);
+		if(*p != 0) usage();
+		break;
+	case 't':
+		telnet = EARGF(usage());
+		break;
+	case 'C':
+		if(realcolors) usage();
+		realcolors++;
+		p = EARGF(usage());
+		colbgv = strtol(p, &p, 16) << 8 | 0xff;
+		if(*p++ != ',') usage();
+		colfgv = strtol(p, &p, 16) << 8 | 0xff;
+		if(*p != 0) usage();
+		break;		
+	case 'd':
+		diag++;
+		break;
+	default: usage();
+	}ARGEND;
+	if(argc != 0) usage();
+	
+	keych = chancreate(sizeof(int), 64);
+	uartrxch = chancreate(sizeof(int), 128);
+	uarttxch = chancreate(sizeof(int), 128);
+	if(telnet != nil) telnetinit(telnet);
+	meminit();
+	if(initdraw(nil, nil, nil) < 0)
+		sysfatal("initdraw: %r");
+	
+	screeninit();
+	proccreate(keyproc, nil, mainstacksize);
+	mc = initmouse(nil, screen);
+	if(mc == nil)
+		sysfatal("initmouse: %r");
+	setcursor(mc, &blank);
+
+	cpureset();
+	for(;;){
+		keycheck();
+		n = step();
+		vblctr += n;
+		if(vblctr >= VBLDIV){
+			irq |= INTVBL;
+			redraw();
+			vblctr -= VBLDIV;
+		}
+		if(uartrxctr > 0)
+			uartrxctr -= n;
+	}
+}
diff --git a/sys/src/games/blit/cpu.c b/sys/src/games/blit/cpu.c
new file mode 100644
index 000000000..8a7e8db86
--- /dev/null
+++ b/sys/src/games/blit/cpu.c
@@ -0,0 +1,1184 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.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 trace, 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/blit/dat.h b/sys/src/games/blit/dat.h
new file mode 100644
index 000000000..f96cee674
--- /dev/null
+++ b/sys/src/games/blit/dat.h
@@ -0,0 +1,31 @@
+typedef signed char s8int;
+typedef signed short s16int;
+typedef signed long s32int;
+
+extern u32int curpc, irq;
+extern int trace, debug;
+
+extern ushort ram[128*1024];
+
+extern int daddr;
+extern ushort dstat;
+extern uchar invert;
+
+extern int mousex, mousey, mousebut;
+
+extern int vblctr, uartrxctr;
+extern int baud;
+
+enum {
+	INTKEY = 1,
+	INTMOUSE = 2,
+	INTUART = 4,
+	INTVBL = 8,
+};
+
+enum {
+	SX = 800,
+	SY = 1024,
+	FREQ = 8000*1000,
+	VBLDIV = FREQ / 60,
+};
diff --git a/sys/src/games/blit/diagbits b/sys/src/games/blit/diagbits
new file mode 100644
index 000000000..9f1302e52
--- /dev/null
+++ b/sys/src/games/blit/diagbits
diff --git a/sys/src/games/blit/fns.h b/sys/src/games/blit/fns.h
new file mode 100644
index 000000000..516527215
--- /dev/null
+++ b/sys/src/games/blit/fns.h
@@ -0,0 +1,8 @@
+u16int memread(u32int);
+void memwrite(u32int, u16int, u16int);
+int intack(int);
+int step(void);
+void meminit(void);
+void cpureset(void);
+void keycheck(void);
+void telnetinit(char *);
diff --git a/sys/src/games/blit/mem.c b/sys/src/games/blit/mem.c
new file mode 100644
index 000000000..08a3a4d41
--- /dev/null
+++ b/sys/src/games/blit/mem.c
@@ -0,0 +1,180 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <draw.h>
+#include <bio.h>
+#include <mouse.h>
+#include "dat.h"
+#include "fns.h"
+
+u32int irq;
+u32int irql[8] = {
+	[1] INTVBL,
+	[2] INTKEY,
+	[4] INTMOUSE,
+	[5] INTUART,
+};
+int diag;
+
+ushort ram[128*1024];
+ushort rom[3*4096];
+Channel *keych;
+Channel *uartrxch, *uarttxch;
+int mousex, mousey, mousebut;
+
+int yes;
+u8int kbdctrl, uartctrl;
+enum {
+	ACIATXMASK = 0x60,
+	ACIATXIRQ = 0x20,
+	ACIARXIRQ = 0x80,
+};
+
+int keybuf = -1;
+int uartrxbuf = -1;
+int uarttxbuf = -1;
+
+void
+meminit(void)
+{
+	int i, x;
+	Biobuf *bp;
+	char *s;
+	ushort *p, *q;
+	
+	p = rom;
+	if(diag){
+		bp = Bopen("diagbits", OREAD);
+		if(bp == nil) sysfatal("Bopen: %r");
+		Bread(bp, rom, sizeof(rom));
+		Bterm(bp);
+		return;
+	}
+	for(i = 0; i < 6; i++){
+		bp = Bopen(smprint("rom%d", i), OREAD);
+		if(bp == nil) sysfatal("Bopen: %r");
+		q = p;
+		for(;;){
+			s = Brdline(bp, '\n');
+			if(s == nil || Blinelen(bp) == 0) break;
+			s[Blinelen(bp) - 1] = 0;
+			x = strtol(s, nil, 8);
+			if((i & 1) != 0)
+				*p |= x << 8;
+			else
+				*p |= x;
+			p++;
+		}
+		if((i & 1) == 0) p = q;
+		Bterm(bp);
+	}
+	write(3, rom, sizeof(rom));
+}
+
+void
+keycheck(void)
+{
+	yield();
+
+	if(keybuf < 0)
+		nbrecv(keych, &keybuf);
+	if(keybuf >= 0 && (kbdctrl & ACIARXIRQ) != 0)
+		irq |= INTKEY;
+	else
+		irq &= ~INTKEY;
+	
+	if(uartrxbuf < 0 && uartrxctr <= 0){
+		nbrecv(uartrxch, &uartrxbuf);
+		uartrxctr = FREQ * 11 / baud;
+	}
+	if(uarttxbuf >= 0 && nbsend(uarttxch, &uarttxbuf) > 0)
+		uarttxbuf = -1;
+	if(uartrxbuf >= 0 && (uartctrl & ACIARXIRQ) != 0 || uarttxbuf < 0 && (uartctrl & ACIATXMASK) == ACIATXIRQ)
+		irq |= INTUART;
+	else
+		irq &= ~INTUART;
+}
+
+u16int
+memread(u32int a)
+{
+	int rc;
+
+	a &= 0x3fffff;
+	if(a < 8) a += 0x40000;
+	if(a < 0x40000) return ram[a/2];
+	if(a >= 0x40000 && a < 0x40000 + sizeof(rom))
+		return rom[(a - 0x40000)/2];
+	switch(a & ~1){
+	case 01400000: return mousey;
+	case 01400002: return mousex;
+	case 01400010: /* uart status */
+		rc = 0;
+		if(uartrxbuf >= 0) rc |= 1;
+		if(uarttxbuf < 0) rc |= 2;
+		return rc | rc << 8;
+	case 01400012: /* uart data */
+		rc = uartrxbuf;
+		uartrxbuf = -1;
+		yes=1;
+		return rc | rc << 8;
+	case 01400020:
+	case 01400024:
+		irq &= ~INTMOUSE;
+		return mousebut | mousebut << 8;
+	case 01400026: return 0; /* mouse: unknown purpose */
+	case 01400030: return daddr >> 2; /* display address */
+	case 01400040: return dstat; /* display status */
+	case 01400060: /* keyboard status */
+		rc = 2;
+		if(keybuf >= 0) rc |= 1;
+		return rc | rc << 8;
+	case 01400062: /* keyboard data */
+		rc = keybuf;
+		keybuf = -1;
+		return rc | rc << 8;
+	}
+	print("read %.8o (curpc = %.6x)\n", a, curpc & 0x3fffff);
+	return 0;
+}
+
+void
+memwrite(u32int a, u16int v, u16int m)
+{
+	extern Rectangle updated;
+	int x, y;
+
+	a &= 0x3fffff;
+	if(a < 0x40000){
+		if(a >= daddr){
+			y = (a - daddr) / 100;
+			x = (((a & ~1) - daddr) % 100) * 8;
+			if(updated.min.x > x) updated.min.x = x;
+			if(updated.max.x < x+16) updated.max.x = x+16;
+			if(updated.min.y > y) updated.min.y = y;
+			if(updated.max.y <= y) updated.max.y = y+1;
+		}
+		ram[a/2] = ram[a/2] & ~m | v & m;
+		return;
+	}
+	switch(a & ~1){
+	case 01400010: uartctrl = v; return;
+	case 01400012: uarttxbuf = (uchar) v; return;
+	case 01400024: return; /* mouse: purpose unknown */
+	case 01400026: return; /* mouse: purpose unknown */
+	case 01400030: daddr = ((daddr >> 2) & ~m | v & m) << 2; return;
+	case 01400040: dstat = dstat & ~m | v & m; invert = -(dstat & 1); updated = Rect(0, 0, SX, SY); return;
+	case 01400056: /* sound; exact function unknown */ return;
+	case 01400060: kbdctrl = v; return;
+	case 01400062: /* reset keyboard */ return;
+	case 01400070: irq &= ~INTVBL; return;
+	case 01400156: /* sound; exact function unknown */ return;
+	}
+	print("write %.8o = %.4x (mask = %.4x, curpc = %.6x)\n", a, v, m, curpc & 0x3fffff);
+}
+
+int
+intack(int l)
+{
+	return 24+l;
+}
diff --git a/sys/src/games/blit/mkfile b/sys/src/games/blit/mkfile
new file mode 100644
index 000000000..77aab9aa3
--- /dev/null
+++ b/sys/src/games/blit/mkfile
@@ -0,0 +1,12 @@
+</$objtype/mkfile
+
+BIN=/$objtype/bin
+TARG=blit
+HFILES=dat.h fns.h
+OFILES=\
+	blit.$O\
+	cpu.$O\
+	mem.$O\
+	telnet.$O\
+
+</sys/src/cmd/mkone
diff --git a/sys/src/games/blit/mmap b/sys/src/games/blit/mmap
new file mode 100644
index 000000000..c08abd53b
--- /dev/null
+++ b/sys/src/games/blit/mmap
@@ -0,0 +1,88 @@
+- main CPU is a MC68000 running at 8 MHz.
+    the exact clock speed is most likely one of: 7.9872, 7.68 or 7.3728 MHz (to divide to 19200 baud)
+- display is 800x1024, refreshed at 30 Hz (60 Hz interlaced).
+    it simply displays the 100K framebuffer from the address given in register 030.
+- the host is connected through a UART running at 19200 baud.
+- the keyboard is connected through a UART running at an unknown baudrate.
+- the mouse is connected through some unknown circuitry.
+
+memory map
+
+start		end		purpose
+0x00000		0x00008		see register 050 below
+0x00008		0x40000		RAM (256K)
+0x40000		???		ROM (24K ?) (not known if mirrored)
+0x60000		???		memory mapped I/O
+
+mmio addresses (in *octal*):
+
+0000	16-bit	mouse y
+0002	16-bit	mouse x
+
+0011	8-bit	terminal UART status/control (MC 6850 ACIA)
+0013	8-bit	terminal UART data
+	the software uses 2 stop bits, no parity, 8 bits; clock divided by 16
+
+0021	8-bit	mouse buttons
+			bit 0: rmb
+			bit 1: mmb
+			bit 2: lmb
+			reading clears the mouse interrupt
+
+0025	8-bit	second copy of 0021 (?)
+0027	8-bit	???
+		only the ROM binaries contain references to 0025, 0027 in buttons.c.
+		the corresponding source code appears to have been deleted.
+		possibly some older variant of the button hardware?
+
+0030	16-bit	start address of framebuffer divided by 4 (800*1024/8 = 100K bytes)
+0040	16-bit	status/control register of display
+			bit 0: invert display
+			with this bit set 0 bits are white and 1 bits are black (most software does this).
+
+0050	16-bit	writing different values makes 0-8 either mapped to 0x40000 or error out (details unclear)
+		resets so that they map to the reset vector at 0x40000.
+
+0056	8-bit	some kind of sound-making device (standard programmable timer + piezoelectric speaker?)
+0156		referenced by demo pacman.
+0256
+	
+0060	8-bit	keyboard status/control register (MC 6850 ACIA)
+	the software uses 2 stop bits, no parity, 8 bits; clock divided by 16
+0062	8-bit	keyboard data register
+
+0070	16-bit?	acknowledge vblank interrupt; software writes 0
+
+tx to the keyboard sets the 7 lights and can also ring the bell.
+could deduce the order of lights from diag.c.
+writing 2 is used to sound the bell.
+
+irq lines; using the 68k autovectoring
+
+vector 1 (0x64) is vblank
+vector 2 (0x68) is keyboard
+vector 4 (0x70) is mouse buttons
+vector 5 (0x74) is uart
+
+MC 6850 bits:
++0 (r)	status register
+	bit 0: receive buffer full
+	bit 1: transmit buffer empty
+	bit 2: data carrier detected (inverted)
+	bit 3: clear-to-send (inverted)
+	bit 4: framing error
+	bit 5: receiver overrun
+	bit 6: parity error
+	bit 7: irq active
++0 (w)	control register
+	bit 1-0: clock divider
+		00: /1
+		01: /16
+		10: /64
+		11: master reset
+	bit 4-2: parity and stop bits (see datasheet)
+	bit 6-5:
+		RTS/ is high only if these bits are 10
+		TX interrupts are enabled only if these bits are 01
+		break is transmitted continuously if these bits are 11
+	bit 7: RX interrupt enabled
diff --git a/sys/src/games/blit/rom0 b/sys/src/games/blit/rom0
new file mode 100644
index 000000000..e8192497b
--- /dev/null
+++ b/sys/src/games/blit/rom0
@@ -0,0 +1,4096 @@
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diff --git a/sys/src/games/blit/rom1 b/sys/src/games/blit/rom1
new file mode 100644
index 000000000..ca0cc1d0d
--- /dev/null
+++ b/sys/src/games/blit/rom1
@@ -0,0 +1,4096 @@
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diff --git a/sys/src/games/blit/rom2 b/sys/src/games/blit/rom2
new file mode 100644
index 000000000..e5773489a
--- /dev/null
+++ b/sys/src/games/blit/rom2
@@ -0,0 +1,4096 @@
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diff --git a/sys/src/games/blit/rom3 b/sys/src/games/blit/rom3
new file mode 100644
index 000000000..e7e43d96a
--- /dev/null
+++ b/sys/src/games/blit/rom3
@@ -0,0 +1,4096 @@
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diff --git a/sys/src/games/blit/rom4 b/sys/src/games/blit/rom4
new file mode 100644
index 000000000..a8c885b85
--- /dev/null
+++ b/sys/src/games/blit/rom4
@@ -0,0 +1,2239 @@
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diff --git a/sys/src/games/blit/rom5 b/sys/src/games/blit/rom5
new file mode 100644
index 000000000..82ed5d70a
--- /dev/null
+++ b/sys/src/games/blit/rom5
@@ -0,0 +1,2239 @@
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diff --git a/sys/src/games/blit/telnet.c b/sys/src/games/blit/telnet.c
new file mode 100644
index 000000000..af072acaf
--- /dev/null
+++ b/sys/src/games/blit/telnet.c
@@ -0,0 +1,149 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include "dat.h"
+#include "fns.h"
+
+Channel *telnetrxch, *telnettxch;
+extern Channel *uartrxch, *uarttxch;
+int teldebug;
+
+enum {
+	SE = 240,
+	NOP = 241,
+	BRK = 243,
+	IP = 244,
+	AO = 245,
+	AYT = 246,
+	EC = 247,
+	EL = 248,
+	GA = 249,
+	SB = 250,
+	WILL = 251,
+	WONT = 252,
+	DO = 253,
+	DONT = 254,
+	IAC = 255,
+	
+	XMITBIN = 0,
+	ECHO = 1,
+	SUPRGA = 3,
+	LINEEDIT = 34,
+	
+};
+
+int telfd;
+
+static void
+netrproc(void *)
+{
+	static uchar buf[512];
+	int n, c;
+	uchar *p;
+	
+	for(;;){
+		n = read(telfd, buf, sizeof(buf));
+		if(n < 0) sysfatal("read: %r");
+		for(p = buf; p < buf + n; p++){
+			c = *p;
+			send(telnetrxch, &c);
+		}
+	}
+}
+
+static void
+netwproc(void *)
+{
+	static uchar buf[512];
+	int c;
+	uchar *p;
+	
+	for(;;){
+		recv(telnettxch, &c);
+		p = buf;
+		do
+			*p++ = c;
+		while(nbrecv(telnettxch, &c) > 0);
+		if(write(telfd, buf, p - buf) < p - buf)
+			sysfatal("write: %r");
+	}
+}
+
+static void
+telnetrthread(void *)
+{
+	int c;
+
+	for(;;){
+		recv(telnetrxch, &c);
+		if(c != IAC){
+			send(uartrxch, &c);
+			continue;
+		}
+		recv(telnetrxch, &c);
+		switch(c){
+		case NOP: break;
+		case WILL:
+			recv(telnetrxch, &c);
+			if(teldebug) fprint(2, "WILL %d\n", c);
+			break;
+		case WONT:
+			recv(telnetrxch, &c);
+			if(teldebug) fprint(2, "WONT %d\n", c);
+			break;
+		case DO:
+			recv(telnetrxch, &c);
+			if(teldebug) fprint(2, "DO %d\n", c);
+			break;
+		case DONT:
+			recv(telnetrxch, &c);
+			if(teldebug) fprint(2, "DONT %d\n", c);
+			break;
+		case IAC:
+			send(uartrxch, &c);
+			break;
+		default:	
+			fprint(2, "unknown telnet command %d\n", c);
+		}
+	}
+}
+
+static void
+cmd(int a, int b)
+{
+	send(telnettxch, &a);
+	if(b >= 0) send(telnettxch, &b);
+}
+
+static void
+telnetwthread(void *)
+{
+	int c;
+
+	for(;;){
+		recv(uarttxch, &c);
+		send(telnettxch, &c);
+		if(c == 0xff)
+			send(telnettxch, &c);
+	}
+}
+
+void
+telnetinit(char *dialstr)
+{
+	telfd = dial(netmkaddr(dialstr, nil, "telnet"), nil, nil, nil);
+	if(telfd < 0) sysfatal("dial: %r");
+	telnetrxch = chancreate(sizeof(int), 128);
+	telnettxch = chancreate(sizeof(int), 128);
+	cmd(WILL, XMITBIN);
+	cmd(DO, XMITBIN);
+	cmd(DONT, ECHO);
+	cmd(DO, SUPRGA);
+	cmd(WILL, SUPRGA);
+	cmd(WONT, LINEEDIT);
+	cmd(DONT, LINEEDIT);
+	proccreate(netrproc, nil, mainstacksize);
+	proccreate(netwproc, nil, mainstacksize);
+	threadcreate(telnetrthread, nil, mainstacksize);
+	threadcreate(telnetwthread, nil, mainstacksize);
+}
diff --git a/sys/src/games/mkfile b/sys/src/games/mkfile
index 039d5cd36..636ea3726 100644
--- a/sys/src/games/mkfile
+++ b/sys/src/games/mkfile
@@ -3,6 +3,7 @@
 TARG=4s\
 	5s\
 	ana\
+	blit\
 	catclock\
 	festoon\
 	geigerstats\