uxn/src/uxnemu.c

#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include "uxn.h"

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
#include <SDL.h>
#include "devices/ppu.h"
#include "devices/apu.h"
#pragma GCC diagnostic pop

/*
Copyright (c) 2021 Devine Lu Linvega

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE.
*/

#define PAD 4
#define FIXED_SIZE 0
#define POLYPHONY 4
#define BENCH 0

static SDL_Window *gWindow;
static SDL_Texture *gTexture;
static SDL_Renderer *gRenderer;
static SDL_AudioDeviceID audio_id;
static SDL_Rect gRect;

/* devices */
static Ppu ppu;
static Apu apu[POLYPHONY];
static Device *devsystem, *devscreen, *devmouse, *devctrl, *devaudio0, *devconsole;
static Uint32 *ppu_screen, stdin_event, audio0_event, palette[16];

static Uint8 zoom = 1;
static unsigned int reqdraw = 0;

static Uint8 font[][8] = {
	{0x00, 0x7c, 0x82, 0x82, 0x82, 0x82, 0x82, 0x7c},
	{0x00, 0x30, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10},
	{0x00, 0x7c, 0x82, 0x02, 0x7c, 0x80, 0x80, 0xfe},
	{0x00, 0x7c, 0x82, 0x02, 0x1c, 0x02, 0x82, 0x7c},
	{0x00, 0x0c, 0x14, 0x24, 0x44, 0x84, 0xfe, 0x04},
	{0x00, 0xfe, 0x80, 0x80, 0x7c, 0x02, 0x82, 0x7c},
	{0x00, 0x7c, 0x82, 0x80, 0xfc, 0x82, 0x82, 0x7c},
	{0x00, 0x7c, 0x82, 0x02, 0x1e, 0x02, 0x02, 0x02},
	{0x00, 0x7c, 0x82, 0x82, 0x7c, 0x82, 0x82, 0x7c},
	{0x00, 0x7c, 0x82, 0x82, 0x7e, 0x02, 0x82, 0x7c},
	{0x00, 0x7c, 0x82, 0x02, 0x7e, 0x82, 0x82, 0x7e},
	{0x00, 0xfc, 0x82, 0x82, 0xfc, 0x82, 0x82, 0xfc},
	{0x00, 0x7c, 0x82, 0x80, 0x80, 0x80, 0x82, 0x7c},
	{0x00, 0xfc, 0x82, 0x82, 0x82, 0x82, 0x82, 0xfc},
	{0x00, 0x7c, 0x82, 0x80, 0xf0, 0x80, 0x82, 0x7c},
	{0x00, 0x7c, 0x82, 0x80, 0xf0, 0x80, 0x80, 0x80}};

static int
clamp(int val, int min, int max)
{
	return (val >= min) ? (val <= max) ? val : max : min;
}

static int
error(char *msg, const char *err)
{
	fprintf(stderr, "%s: %s\n", msg, err);
	return 0;
}

static void
audio_callback(void *u, Uint8 *stream, int len)
{
	int i, running = 0;
	Sint16 *samples = (Sint16 *)stream;
	SDL_memset(stream, 0, len);
	for(i = 0; i < POLYPHONY; ++i)
		running += apu_render(&apu[i], samples, samples + len / 2);
	if(!running)
		SDL_PauseAudioDevice(audio_id, 1);
	(void)u;
}

static void
set_window_size(SDL_Window *window, int w, int h)
{
	int win_x, win_y;
	int win_cent_x, win_cent_y;
	int old_win_sz_x, old_win_sz_y;

	SDL_GetWindowPosition(window, &win_x, &win_y);
	SDL_GetWindowSize(window, &old_win_sz_x, &old_win_sz_y);

	win_cent_x = win_x + old_win_sz_x / 2;
	win_cent_y = win_y + old_win_sz_y / 2;

	SDL_SetWindowPosition(window, win_cent_x - w / 2, win_cent_y - h / 2);
	SDL_SetWindowSize(window, w, h);
}

static void
inspect(Ppu *p, Uint8 *stack, Uint8 wptr, Uint8 rptr, Uint8 *memory)
{
	Uint8 i, x, y, b;
	for(i = 0; i < 0x20; ++i) { /* stack */
		x = ((i % 8) * 3 + 1) * 8, y = (i / 8 + 1) * 8, b = stack[i];
		ppu_1bpp(p, 1, x, y, font[(b >> 4) & 0xf], 1 + (wptr == i) * 0x7, 0, 0);
		ppu_1bpp(p, 1, x + 8, y, font[b & 0xf], 1 + (wptr == i) * 0x7, 0, 0);
	}
	/* return pointer */
	ppu_1bpp(p, 1, 0x8, y + 0x10, font[(rptr >> 4) & 0xf], 0x2, 0, 0);
	ppu_1bpp(p, 1, 0x10, y + 0x10, font[rptr & 0xf], 0x2, 0, 0);
	for(i = 0; i < 0x20; ++i) { /* memory */
		x = ((i % 8) * 3 + 1) * 8, y = 0x38 + (i / 8 + 1) * 8, b = memory[i];
		ppu_1bpp(p, 1, x, y, font[(b >> 4) & 0xf], 3, 0, 0);
		ppu_1bpp(p, 1, x + 8, y, font[b & 0xf], 3, 0, 0);
	}
	for(x = 0; x < 0x10; ++x) { /* guides */
		ppu_pixel(p, 1, x, p->height / 2, 2);
		ppu_pixel(p, 1, p->width - x, p->height / 2, 2);
		ppu_pixel(p, 1, p->width / 2, p->height - x, 2);
		ppu_pixel(p, 1, p->width / 2, x, 2);
		ppu_pixel(p, 1, p->width / 2 - 0x10 / 2 + x, p->height / 2, 2);
		ppu_pixel(p, 1, p->width / 2, p->height / 2 - 0x10 / 2 + x, 2);
	}
}

static Uint8
get_pixel(int x, int y)
{
	unsigned int i = x / PPW + y * ppu.stride, shift = x % PPW * 4;
	return (ppu.dat[i] >> shift) & 0xf;
}

static void
redraw(Uxn *u)
{
	Uint16 x, y, y0 = 0, y1 = ppu.height;
	SDL_Rect up = gRect;
	if(devsystem->dat[0xe])
		inspect(&ppu, u->wst.dat, u->wst.ptr, u->rst.ptr, u->ram.dat);
	if(ppu.redraw) {
		y0 = ppu.i0 / ppu.stride;
		y1 = ppu.i1 / ppu.stride + 1;
		up.y += y0;
		up.h = y1 - y0;
	}
	for(y = y0; y < y1; ++y)
		for(x = 0; x < ppu.width; ++x)
			ppu_screen[x + y * ppu.width] = palette[get_pixel(x, y)];
	SDL_UpdateTexture(gTexture, &up, ppu_screen + y0 * ppu.width, ppu.width * sizeof(Uint32));
	SDL_RenderClear(gRenderer);
	SDL_RenderCopy(gRenderer, gTexture, NULL, NULL);
	SDL_RenderPresent(gRenderer);
	reqdraw = 0;
	ppu_frame(&ppu);
}

static void
toggle_debug(Uxn *u)
{
	devsystem->dat[0xe] = !devsystem->dat[0xe];
	redraw(u);
}

static void
toggle_zoom(Uxn *u)
{
	zoom = zoom == 3 ? 1 : zoom + 1;
	set_window_size(gWindow, (ppu.width + PAD * 2) * zoom, (ppu.height + PAD * 2) * zoom);
	redraw(u);
}

static void
capture_screen(void)
{
	const Uint32 format = SDL_PIXELFORMAT_RGB24;
	time_t t = time(NULL);
	char fname[64];
	int w, h;
	SDL_Surface *surface;
	SDL_GetRendererOutputSize(gRenderer, &w, &h);
	surface = SDL_CreateRGBSurfaceWithFormat(0, w, h, 24, format);
	SDL_RenderReadPixels(gRenderer, NULL, format, surface->pixels, surface->pitch);
	strftime(fname, sizeof(fname), "screenshot-%Y%m%d-%H%M%S.bmp", localtime(&t));
	SDL_SaveBMP(surface, fname);
	SDL_FreeSurface(surface);
	fprintf(stderr, "Saved %s\n", fname);
}

static void
quit(void)
{
	SDL_UnlockAudioDevice(audio_id);
	SDL_DestroyTexture(gTexture);
	gTexture = NULL;
	SDL_DestroyRenderer(gRenderer);
	gRenderer = NULL;
	SDL_DestroyWindow(gWindow);
	SDL_Quit();
	exit(0);
}

static int
set_size(Uint16 width, Uint16 height, int is_resize)
{
	ppu_set_size(&ppu, width, height);
	gRect.x = PAD;
	gRect.y = PAD;
	gRect.w = ppu.width;
	gRect.h = ppu.height;
	if(!(ppu_screen = realloc(ppu_screen, ppu.width * ppu.height * sizeof(Uint32))))
		return error("ppu_screen", "Memory failure");
	memset(ppu_screen, 0, ppu.width * ppu.height * sizeof(Uint32));
	if(gTexture != NULL) SDL_DestroyTexture(gTexture);
	SDL_RenderSetLogicalSize(gRenderer, ppu.width + PAD * 2, ppu.height + PAD * 2);
	gTexture = SDL_CreateTexture(gRenderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, ppu.width + PAD * 2, ppu.height + PAD * 2);
	if(gTexture == NULL || SDL_SetTextureBlendMode(gTexture, SDL_BLENDMODE_NONE))
		return error("sdl_texture", SDL_GetError());
	SDL_UpdateTexture(gTexture, NULL, ppu_screen, sizeof(Uint32));
	if(is_resize) set_window_size(gWindow, (ppu.width + PAD * 2) * zoom, (ppu.height + PAD * 2) * zoom);
	reqdraw = 1;
	return 1;
}

static int
init(void)
{
	const Uint16 width = 64 * 8, height = 40 * 8;
	SDL_AudioSpec as;
	SDL_zero(as);
	as.freq = SAMPLE_FREQUENCY;
	as.format = AUDIO_S16;
	as.channels = 2;
	as.callback = audio_callback;
	as.samples = 512;
	as.userdata = NULL;
	if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0) {
		error("sdl", SDL_GetError());
		if(SDL_Init(SDL_INIT_VIDEO) < 0)
			return error("sdl", SDL_GetError());
	} else {
		audio_id = SDL_OpenAudioDevice(NULL, 0, &as, NULL, 0);
		if(!audio_id)
			error("sdl_audio", SDL_GetError());
	}
	gWindow = SDL_CreateWindow("Uxn", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, (width + PAD * 2) * zoom, (height + PAD * 2) * zoom, SDL_WINDOW_SHOWN);
	if(gWindow == NULL)
		return error("sdl_window", SDL_GetError());
	gRenderer = SDL_CreateRenderer(gWindow, -1, 0);
	if(gRenderer == NULL)
		return error("sdl_renderer", SDL_GetError());
	if(!set_size(width, height, 0))
		return 0;
	SDL_StartTextInput();
	SDL_ShowCursor(SDL_DISABLE);
	return 1;
}

static void
domouse(SDL_Event *event)
{
	Uint8 flag = 0x00;
	Uint16 x = clamp(event->motion.x - PAD, 0, ppu.width - 1);
	Uint16 y = clamp(event->motion.y - PAD, 0, ppu.height - 1);
	poke16(devmouse->dat, 0x2, x);
	poke16(devmouse->dat, 0x4, y);
	switch(event->button.button) {
	case SDL_BUTTON_LEFT: flag = 0x01; break;
	case SDL_BUTTON_RIGHT: flag = 0x10; break;
	}
	switch(event->type) {
	case SDL_MOUSEBUTTONDOWN:
		devmouse->dat[6] |= flag;
		break;
	case SDL_MOUSEBUTTONUP:
		devmouse->dat[6] &= (~flag);
		break;
	}
}

static void
doctrl(Uxn *u, SDL_Event *event, int z)
{
	Uint8 flag = 0x00;
	SDL_Keymod mods = SDL_GetModState();
	devctrl->dat[2] &= 0xf8;
	if(mods & KMOD_CTRL) devctrl->dat[2] |= 0x01;
	if(mods & KMOD_ALT) devctrl->dat[2] |= 0x02;
	if(mods & KMOD_SHIFT) devctrl->dat[2] |= 0x04;
	/* clang-format off */
	switch(event->key.keysym.sym) {
	case SDLK_ESCAPE: flag = 0x08; break;
	case SDLK_UP: flag = 0x10; break;
	case SDLK_DOWN: flag = 0x20; break;
	case SDLK_LEFT: flag = 0x40; break;
	case SDLK_RIGHT: flag = 0x80; break;
	case SDLK_F1: if(z) toggle_zoom(u); break;
	case SDLK_F2: if(z) toggle_debug(u); break;
	case SDLK_F3: if(z) capture_screen(); break;
	}
	/* clang-format on */
	if(z) {
		devctrl->dat[2] |= flag;
		if(event->key.keysym.sym < 0x20 || event->key.keysym.sym == SDLK_DELETE)
			devctrl->dat[3] = event->key.keysym.sym;
		else if((mods & KMOD_CTRL) && event->key.keysym.sym >= SDLK_a && event->key.keysym.sym <= SDLK_z)
			devctrl->dat[3] = event->key.keysym.sym - (mods & KMOD_SHIFT) * 0x20;
	} else
		devctrl->dat[2] &= ~flag;
}

void
update_palette(Uint8 *addr)
{
	int i;
	for(i = 0; i < 4; ++i) {
		Uint8
			r = (*(addr + i / 2) >> (!(i % 2) << 2)) & 0x0f,
			g = (*(addr + 2 + i / 2) >> (!(i % 2) << 2)) & 0x0f,
			b = (*(addr + 4 + i / 2) >> (!(i % 2) << 2)) & 0x0f;
		palette[i] = 0xff000000 | (r << 20) | (r << 16) | (g << 12) | (g << 8) | (b << 4) | b;
	}
	for(i = 4; i < 16; ++i)
		palette[i] = palette[i / 4];
	reqdraw = 1;
}

#pragma mark - Devices

static int
system_talk(Device *d, Uint8 b0, Uint8 w)
{
	if(!w) { /* read */
		switch(b0) {
		case 0x2: d->dat[0x2] = d->u->wst.ptr; break;
		case 0x3: d->dat[0x3] = d->u->rst.ptr; break;
		}
	} else { /* write */
		switch(b0) {
		case 0x2: d->u->wst.ptr = d->dat[0x2]; break;
		case 0x3: d->u->rst.ptr = d->dat[0x3]; break;
		case 0xf: return 0;
		}
		if(b0 > 0x7 && b0 < 0xe)
			update_palette(&d->dat[0x8]);
	}
	return 1;
}

static int
console_talk(Device *d, Uint8 b0, Uint8 w)
{
	if(w && b0 > 0x7)
		write(b0 - 0x7, (char *)&d->dat[b0], 1);
	return 1;
}

static int
screen_talk(Device *d, Uint8 b0, Uint8 w)
{
	if(!w) switch(b0) {
		case 0x2: d->dat[0x2] = ppu.width >> 8; break;
		case 0x3: d->dat[0x3] = ppu.width; break;
		case 0x4: d->dat[0x4] = ppu.height >> 8; break;
		case 0x5: d->dat[0x5] = ppu.height; break;
		}
	else
		switch(b0) {
		case 0x5:
			if(!FIXED_SIZE) return set_size(peek16(d->dat, 0x2), peek16(d->dat, 0x4), 1);
			break;
		case 0xe: {
			Uint16 x = peek16(d->dat, 0x8);
			Uint16 y = peek16(d->dat, 0xa);
			Uint8 layer = d->dat[0xe] & 0x40;
			ppu_pixel(&ppu, layer, x, y, d->dat[0xe] & 0x3);
			if(d->dat[0x6] & 0x01) poke16(d->dat, 0x8, x + 1); /* auto x+1 */
			if(d->dat[0x6] & 0x02) poke16(d->dat, 0xa, y + 1); /* auto y+1 */
			break;
		}
		case 0xf: {
			Uint16 x = peek16(d->dat, 0x8);
			Uint16 y = peek16(d->dat, 0xa);
			Uint8 layer = d->dat[0xf] & 0x40;
			Uint8 *addr = &d->mem[peek16(d->dat, 0xc)];
			if(d->dat[0xf] & 0x80) {
				ppu_2bpp(&ppu, layer, x, y, addr, d->dat[0xf] & 0xf, d->dat[0xf] & 0x10, d->dat[0xf] & 0x20);
				if(d->dat[0x6] & 0x04) poke16(d->dat, 0xc, peek16(d->dat, 0xc) + 16); /* auto addr+16 */
			} else {
				ppu_1bpp(&ppu, layer, x, y, addr, d->dat[0xf] & 0xf, d->dat[0xf] & 0x10, d->dat[0xf] & 0x20);
				if(d->dat[0x6] & 0x04) poke16(d->dat, 0xc, peek16(d->dat, 0xc) + 8); /* auto addr+8 */
			}
			if(d->dat[0x6] & 0x01) poke16(d->dat, 0x8, x + 8); /* auto x+8 */
			if(d->dat[0x6] & 0x02) poke16(d->dat, 0xa, y + 8); /* auto y+8 */
			break;
		}
		}
	return 1;
}

static int
file_talk(Device *d, Uint8 b0, Uint8 w)
{
	Uint8 read = b0 == 0xd;
	if(w && (read || b0 == 0xf)) {
		char *name = (char *)&d->mem[peek16(d->dat, 0x8)];
		Uint16 result = 0, length = peek16(d->dat, 0xa);
		long offset = (peek16(d->dat, 0x4) << 16) + peek16(d->dat, 0x6);
		Uint16 addr = peek16(d->dat, b0 - 1);
		FILE *f = fopen(name, read ? "rb" : (offset ? "ab" : "wb"));
		if(f) {
			/* fprintf(stderr, "%s %s %s #%04x, ", read ? "Loading" : "Saving", name, read ? "to" : "from", addr); */
			if(fseek(f, offset, SEEK_SET) != -1)
				result = read ? fread(&d->mem[addr], 1, length, f) : fwrite(&d->mem[addr], 1, length, f);
			/* fprintf(stderr, "%04x bytes\n", result); */
			fclose(f);
		}
		poke16(d->dat, 0x2, result);
	}
	return 1;
}

static int
audio_talk(Device *d, Uint8 b0, Uint8 w)
{
	Apu *c = &apu[d - devaudio0];
	if(!audio_id) return 1;
	if(!w) {
		if(b0 == 0x2)
			poke16(d->dat, 0x2, c->i);
		else if(b0 == 0x4)
			d->dat[0x4] = apu_get_vu(c);
	} else if(b0 == 0xf) {
		SDL_LockAudioDevice(audio_id);
		c->len = peek16(d->dat, 0xa);
		c->addr = &d->mem[peek16(d->dat, 0xc)];
		c->volume[0] = d->dat[0xe] >> 4;
		c->volume[1] = d->dat[0xe] & 0xf;
		c->repeat = !(d->dat[0xf] & 0x80);
		apu_start(c, peek16(d->dat, 0x8), d->dat[0xf] & 0x7f);
		SDL_UnlockAudioDevice(audio_id);
		SDL_PauseAudioDevice(audio_id, 0);
	}
	return 1;
}

static int
datetime_talk(Device *d, Uint8 b0, Uint8 w)
{
	time_t seconds = time(NULL);
	struct tm *t = localtime(&seconds);
	t->tm_year += 1900;
	poke16(d->dat, 0x0, t->tm_year);
	d->dat[0x2] = t->tm_mon;
	d->dat[0x3] = t->tm_mday;
	d->dat[0x4] = t->tm_hour;
	d->dat[0x5] = t->tm_min;
	d->dat[0x6] = t->tm_sec;
	d->dat[0x7] = t->tm_wday;
	poke16(d->dat, 0x08, t->tm_yday);
	d->dat[0xa] = t->tm_isdst;
	(void)b0;
	(void)w;
	return 1;
}

static int
nil_talk(Device *d, Uint8 b0, Uint8 w)
{
	(void)d;
	(void)b0;
	(void)w;
	return 1;
}

#pragma mark - Generics

void
apu_finished_handler(Apu *c)
{
	SDL_Event event;
	event.type = audio0_event + (c - apu);
	SDL_PushEvent(&event);
}

static int
stdin_handler(void *p)
{
	SDL_Event event;
	event.type = stdin_event;
	while(read(0, &event.cbutton.button, 1) > 0)
		SDL_PushEvent(&event);
	return 0;
	(void)p;
}

static const char *errors[] = {"underflow", "overflow", "division by zero"};

int
uxn_halt(Uxn *u, Uint8 error, char *name, int id)
{
	fprintf(stderr, "Halted: %s %s#%04x, at 0x%04x\n", name, errors[error - 1], id, u->ram.ptr);
	return 0;
}

static void
run(Uxn *u)
{
	uxn_eval(u, PAGE_PROGRAM);
	redraw(u);
	while(1) {
		SDL_Event event;
		double elapsed, start = 0;
		if(!BENCH)
			start = SDL_GetPerformanceCounter();
		while(SDL_PollEvent(&event) != 0) {
			switch(event.type) {
			case SDL_QUIT:
				return;
			case SDL_TEXTINPUT:
				devctrl->dat[3] = event.text.text[0]; /* fall-thru */
			case SDL_KEYDOWN:
			case SDL_KEYUP:
				doctrl(u, &event, event.type == SDL_KEYDOWN);
				uxn_eval(u, peek16(devctrl->dat, 0));
				devctrl->dat[3] = 0;
				break;
			case SDL_MOUSEWHEEL:
				devmouse->dat[7] = event.wheel.y;
				uxn_eval(u, peek16(devmouse->dat, 0));
				devmouse->dat[7] = 0;
				break;
			case SDL_MOUSEBUTTONUP:
			case SDL_MOUSEBUTTONDOWN:
			case SDL_MOUSEMOTION:
				domouse(&event);
				uxn_eval(u, peek16(devmouse->dat, 0));
				break;
			case SDL_WINDOWEVENT:
				if(event.window.event == SDL_WINDOWEVENT_EXPOSED)
					redraw(u);
				break;
			default:
				if(event.type == stdin_event) {
					devconsole->dat[0x2] = event.cbutton.button;
					uxn_eval(u, peek16(devconsole->dat, 0));
				} else if(event.type >= audio0_event && event.type < audio0_event + POLYPHONY)
					uxn_eval(u, peek16((devaudio0 + (event.type - audio0_event))->dat, 0));
			}
		}
		uxn_eval(u, peek16(devscreen->dat, 0));
		if(reqdraw || ppu.redraw || devsystem->dat[0xe])
			redraw(u);
		if(!BENCH) {
			elapsed = (SDL_GetPerformanceCounter() - start) / (double)SDL_GetPerformanceFrequency() * 1000.0f;
			SDL_Delay(clamp(16.666f - elapsed, 0, 1000));
		}
	}
}

static int
load(Uxn *u, char *filepath)
{
	FILE *f;
	if(!(f = fopen(filepath, "rb"))) return 0;
	fread(u->ram.dat + PAGE_PROGRAM, sizeof(u->ram.dat) - PAGE_PROGRAM, 1, f);
	fprintf(stderr, "Loaded %s\n", filepath);
	return 1;
}

int
main(int argc, char **argv)
{
	Uxn u;

	stdin_event = SDL_RegisterEvents(1);
	audio0_event = SDL_RegisterEvents(POLYPHONY);
	SDL_CreateThread(stdin_handler, "stdin", NULL);

	if(argc < 2) return error("usage", "uxnemu file.rom");
	if(!uxn_boot(&u)) return error("Boot", "Failed to start uxn.");
	if(!load(&u, argv[1])) return error("Load", "Failed to open rom.");
	if(!init()) return error("Init", "Failed to initialize emulator.");

	/* system   */ devsystem = uxn_port(&u, 0x0, system_talk);
	/* console  */ devconsole = uxn_port(&u, 0x1, console_talk);
	/* screen   */ devscreen = uxn_port(&u, 0x2, screen_talk);
	/* audio0   */ devaudio0 = uxn_port(&u, 0x3, audio_talk);
	/* audio1   */ uxn_port(&u, 0x4, audio_talk);
	/* audio2   */ uxn_port(&u, 0x5, audio_talk);
	/* audio3   */ uxn_port(&u, 0x6, audio_talk);
	/* unused   */ uxn_port(&u, 0x7, nil_talk);
	/* control  */ devctrl = uxn_port(&u, 0x8, nil_talk);
	/* mouse    */ devmouse = uxn_port(&u, 0x9, nil_talk);
	/* file     */ uxn_port(&u, 0xa, file_talk);
	/* datetime */ uxn_port(&u, 0xb, datetime_talk);
	/* unused   */ uxn_port(&u, 0xc, nil_talk);
	/* unused   */ uxn_port(&u, 0xd, nil_talk);
	/* unused   */ uxn_port(&u, 0xe, nil_talk);
	/* unused   */ uxn_port(&u, 0xf, nil_talk);

	run(&u);
	quit();
	return 0;
}