@@ -213,8 +213,8 @@ pass1(FILE *f)

 		else {

 			switch(w[0]) {

 			case '|': addr = shex(w + 1); break;

-			case '.': addr += 2; break;

 			case ',': addr += 3; break;

+			case '.': addr += (slen(w + 1) == 2 ? 1 : 2); break;

 			case '+': /* signed positive */

 			case '-': /* signed negative */

 			case '#': addr += (slen(w + 1) == 2 ? 2 : 3); break;

@@ -242,8 +242,10 @@ pass2(FILE *f)

 		else if((op = findopcode(w)) || scmp(w, "BRK")) pushbyte(op, 0);

 		else if(w[0] == ':') fscanf(f, "%s", w);

 		else if(w[0] == ';') fscanf(f, "%s", w);

-		else if(w[0] == '#' && sihx(w + 1) && slen(w + 1) == 2) pushbyte(shex(w), 1); 

-		else if(w[0] == '#' && sihx(w + 1) && slen(w + 1) == 4) pushshort(shex(w), 1);

+		else if(w[0] == '.' && sihx(w + 1) && slen(w + 1) == 2) pushbyte(shex(w + 1), 0);

+		else if(w[0] == '.' && sihx(w + 1) && slen(w + 1) == 4) pushshort(shex(w + 1), 0);

+		else if(w[0] == '#' && sihx(w + 1) && slen(w + 1) == 2) pushbyte(shex(w + 1), 1); 

+		else if(w[0] == '#' && sihx(w + 1) && slen(w + 1) == 4) pushshort(shex(w + 1), 1);

 		else if(w[0] == '+' && sihx(w + 1) && slen(w + 1) == 2) pushbyte((Sint8)shex(w + 1), 1);

 		else if(w[0] == '+' && sihx(w + 1) && slen(w + 1) == 4) pushshort((Sint16)shex(w + 1), 1);

 		else if(w[0] == '-' && sihx(w + 1) && slen(w + 1) == 2) pushbyte((Sint8)(shex(w + 1) * -1), 1);

@@ -24,5 +24,5 @@ rm -f ./bin/emulator

 cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c emulator.c -L/usr/local/lib -lSDL2 -o bin/emulator

 # run

-./bin/assembler examples/line.usm bin/boot.rom

+./bin/assembler examples/test.usm bin/boot.rom

 ./bin/emulator bin/boot.rom

@@ -37,14 +37,9 @@ SDL_Renderer *gRenderer;

 SDL_Texture *gTexture;

 Uint32 *pixels;

-Device *devconsole, *devscreen, *devmouse, *devkey;

+Device *devconsole, *devscreen, *devmouse, *devkey, *devsprite;

-int

-error(char *msg, const char *err)

-{

-	printf("Error %s: %s\n", msg, err);

-	return 0;

-}

+#pragma mark - Helpers

 void

 clear(Uint32 *dst)

@@ -59,7 +54,41 @@ void

 putpixel(Uint32 *dst, int x, int y, int color)

 {

 	if(x >= 0 && x < WIDTH - 8 && y >= 0 && y < HEIGHT - 8)

-		dst[y * WIDTH + x] = theme[color];

+		dst[(y + PAD * 8) * WIDTH + (x + PAD * 8)] = theme[color];

+}

+

+void

+drawchr(Uint32 *dst, int x, int y, Uint8 *sprite)

+{

+	int v, h;

+	for(v = 0; v < 8; v++)

+		for(h = 0; h < 8; h++) {

+			int ch1 = ((sprite[v] >> h) & 0x1);

+			int ch2 = (((sprite[v + 8] >> h) & 0x1) << 1);

+			int clr = ch1 + ch2;

+			int guides = GUIDES && !clr && ((x + y) / 8) % 2;

+			putpixel(dst, x + 7 - h, y + v, guides ? 4 : clr);

+		}

+}

+

+void

+drawicn(Uint32 *dst, int x, int y, Uint8 *sprite, int fg, int bg)

+{

+	int v, h;

+	for(v = 0; v < 8; v++)

+		for(h = 0; h < 8; h++) {

+			int ch1 = (sprite[v] >> (7 - h)) & 0x1;

+			putpixel(dst, x + h, y + v, ch1 ? fg : bg);

+		}

+}

+

+#pragma mark - Core

+

+int

+error(char *msg, const char *err)

+{

+	printf("Error %s: %s\n", msg, err);

+	return 0;

 }

 void

@@ -170,7 +199,7 @@ dokey(SDL_Event *event)

 #pragma mark - Devices

 Uint8

-consoler(Device *d, Uint8 b)

+consoler(Device *d, Memory *m, Uint8 b)

 {

 	(void)b;

 	(void)d;

@@ -178,7 +207,7 @@ consoler(Device *d, Uint8 b)

 }

 Uint8

-consolew(Device *d, Uint8 b)

+consolew(Device *d, Memory *m, Uint8 b)

 {

 	(void)d;

 	if(b)

@@ -188,7 +217,7 @@ consolew(Device *d, Uint8 b)

 }

 Uint8

-screenr(Device *d, Uint8 b)

+ppur(Device *d, Memory *m, Uint8 b)

 {

 	switch(b) {

 	case 0: return (WIDTH >> 8) & 0xff;

@@ -200,7 +229,7 @@ screenr(Device *d, Uint8 b)

 }

 Uint8

-screenw(Device *d, Uint8 b)

+ppuw(Device *d, Memory *m, Uint8 b)

 {

 	d->mem[d->len++] = b;

 	if(d->len > 5) {

@@ -216,13 +245,35 @@ screenw(Device *d, Uint8 b)

 }

 Uint8

-mouser(Device *d, Uint8 b)

+ppusr(Device *d, Memory *m, Uint8 b)

+{

+	return 0;

+}

+

+Uint8

+ppusw(Device *d, Memory *m, Uint8 b)

+{

+	d->mem[d->len++] = b;

+	if(d->len > 6) {

+		Uint16 x = (d->mem[2] << 8) + d->mem[3];

+		Uint16 y = (d->mem[0] << 8) + d->mem[1];

+		Uint8 *chr = &m->dat[(d->mem[4] << 8) + d->mem[5]];

+		drawchr(pixels, x, y, chr);

+		if(d->mem[6])

+			redraw(pixels);

+		d->len = 0;

+	}

+	return 0;

+}

+

+Uint8

+mouser(Device *d, Memory *m, Uint8 b)

 {

 	return d->mem[b];

 }

 Uint8

-mousew(Device *d, Uint8 b)

+mousew(Device *d, Memory *m, Uint8 b)

 {

 	(void)d;

 	(void)b;

@@ -230,7 +281,7 @@ mousew(Device *d, Uint8 b)

 }

 Uint8

-keyr(Device *d, Uint8 b)

+keyr(Device *d, Memory *m, Uint8 b)

 {

 	(void)d;

 	(void)b;

@@ -238,7 +289,7 @@ keyr(Device *d, Uint8 b)

 }

 Uint8

-keyw(Device *d, Uint8 b)

+keyw(Device *d, Memory *m, Uint8 b)

 {

 	(void)d;

 	(void)b;

@@ -295,9 +346,10 @@ main(int argc, char **argv)

 		return error("Init", "Failed");

 	devconsole = portuxn(&u, "console", consoler, consolew);

-	devscreen = portuxn(&u, "screen", screenr, screenw);

+	devscreen = portuxn(&u, "ppu", ppur, ppuw);

 	devmouse = portuxn(&u, "mouse", mouser, mousew);

 	devkey = portuxn(&u, "key", keyr, keyw);

+	devsprite = portuxn(&u, "ppu-sprite", ppusr, ppusw);

 	start(&u);

@@ -4,16 +4,42 @@

 |0100 @RESET 

-	#00 ,dev/w STR                           ( set dev/write to console ) 

-	,string                                  ( add string pointer to stack )

-	@loop

-		DUP2 LDR IOW                         ( write pointer value to console )

-		#0001 ADD2                           ( increment string pointer )

-		DUP2 LDR #00 NEQ ,loop ROT JMP? POP2 ( while *ptr!=0 goto loop )

+	#01 ,dev/w STR                           ( set dev/write to screen ) 

+

+	( draw 1 pixel )

+	#00 #01 #0021 #0021 ,putpixel JSR

+

+	#04 ,dev/w STR                           ( set dev/write to screen ) 

+

+	#00 ,star_icn #0001 #0001 ,putsprite JSR

+

+	#00 ,star_icn #0031 #0021 ,putsprite JSR

+	#00 ,cursor_icn #0021 #0016 ,putsprite JSR

+	#00 ,star_icn #0055 #0042 ,putsprite JSR

+	#01 ,cursor_icn #0067 #0031 ,putsprite JSR

 BRK

-@string " Hello World "                      ( add string to memory )

+@putsprite

+	IOW2 ( y short )

+	IOW2 ( x short )

+	IOW2 ( sprite address )

+	IOW  ( redraw byte )

+	RTS

+

+@putpixel 

+	IOW2 ( y short )

+	IOW2 ( x short )

+	IOW  ( color byte )

+	IOW  ( redraw byte )

+	RTS

+

+|0200 @SPRITESHEET

+

+@cursor_icn .80c0 .e0f0 .f8e0 .1000 .0000 .0000 .0000 .0000

+@star_icn   .1054 .28c6 .2854 .1000 .0000 .0000 .0000 .0000

+

+BRK

 |c000 @FRAME BRK

 |d000 @ERROR BRK 

@@ -34,8 +34,8 @@ void op_brk(Uxn *u) { setflag(&u->status,FLAG_HALT, 1); }

 void op_lit(Uxn *u) { u->literal += 1; }

 void op_lix(Uxn *u) { u->literal += u->ram.dat[u->ram.ptr++]; }

 void op_nop(Uxn *u) { printf("0x%02x ", pop8(&u->wst)); }

-void op_ior(Uxn *u) { Device *dev = &u->dev[mempeek8(&u->ram, u->devr)]; if(dev) push8(&u->wst, dev->read(dev, pop8(&u->wst))); }

-void op_iow(Uxn *u) { Uint8 a = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devw)]; if(dev) dev->write(dev, a); }

+void op_ior(Uxn *u) { Device *dev = &u->dev[mempeek8(&u->ram, u->devr)]; if(dev) push8(&u->wst, dev->read(dev, &u->ram, pop8(&u->wst))); }

+void op_iow(Uxn *u) { Uint8 a = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devw)]; if(dev) dev->write(dev, &u->ram, a); }

 void op_ldr(Uxn *u) { Uint16 a = pop16(&u->wst); push8(&u->wst, mempeek8(&u->ram, a)); }

 void op_str(Uxn *u) { Uint16 a = pop16(&u->wst); Uint8 b = pop8(&u->wst); mempoke8(&u->ram, a, b); }

 /* Logic */

@@ -63,8 +63,8 @@ void op_lth(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst,

 /* --- */

 void op_lit16(Uxn *u) { u->literal += 2; }

 void op_nop16(Uxn *u) { printf("%04x\n", pop16(&u->wst)); }

-void op_ior16(Uxn *u) { Uint8 a = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devr)]; if(dev) push16(&u->wst, (dev->read(dev, a) << 8) + dev->read(dev, a + 1)); }

-void op_iow16(Uxn *u) { Uint8 a = pop8(&u->wst); Uint8 b = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devw)]; if(dev) { dev->write(dev, b); dev->write(dev, a); } }

+void op_ior16(Uxn *u) { Uint8 a = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devr)]; if(dev) push16(&u->wst, (dev->read(dev, &u->ram, a) << 8) + dev->read(dev, &u->ram, a + 1)); }

+void op_iow16(Uxn *u) { Uint8 a = pop8(&u->wst); Uint8 b = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devw)]; if(dev) { dev->write(dev, &u->ram, b); dev->write(dev, &u->ram, a); } }

 void op_ldr16(Uxn *u) { Uint16 a = pop16(&u->wst); push16(&u->wst, mempeek16(&u->ram, a)); }

 void op_str16(Uxn *u) { Uint16 a = pop16(&u->wst); Uint16 b = pop16(&u->wst); mempoke16(&u->ram, a, b); }

 /* Stack(16-bits) */

@@ -202,7 +202,7 @@ loaduxn(Uxn *u, char *filepath)

 }

 Device *

-portuxn(Uxn *u, char *name, Uint8 (*rfn)(Device *, Uint8), Uint8 (*wfn)(Device *, Uint8))

+portuxn(Uxn *u, char *name, Uint8 (*rfn)(Device *, Memory *, Uint8), Uint8 (*wfn)(Device *, Memory *, Uint8))

 {

 	Device *d = &u->dev[u->devices++];

 	d->read = rfn;

@@ -33,8 +33,8 @@ typedef struct {

 typedef struct Device {

 	Uint8 len, mem[8];

-	Uint8 (*read)(struct Device *, Uint8);

-	Uint8 (*write)(struct Device *, Uint8);

+	Uint8 (*read)(struct Device *, Memory *, Uint8);

+	Uint8 (*write)(struct Device *, Memory *, Uint8);

 } Device;

 typedef struct {

@@ -50,4 +50,4 @@ int getflag(Uint8 *status, char flag);

 int loaduxn(Uxn *c, char *filepath);

 int bootuxn(Uxn *c);

 int evaluxn(Uxn *u, Uint16 vec);

-Device *portuxn(Uxn *u, char *name, Uint8 (*rfn)(Device *, Uint8), Uint8 (*wfn)(Device *, Uint8));

+Device *portuxn(Uxn *u, char *name, Uint8 (*rfn)(Device *, Memory *, Uint8), Uint8 (*wfn)(Device *, Memory *, Uint8));