usim

			cadet_shifts &= ~(1 << CADET_IX_TOP);
		else if ((scc == CADET_LEFT_SHIFT) || (scc == CADET_RIGHT_SHIFT))
			cadet_shifts &= ~(1 << CADET_IX_SHIFT);
	}
}

void

cadet_process_key(int keysym,	/* keysym, acts as index into kbd_map */
    int bi,			/* bucky, acts as index into modifier_map */
    int keydown,		/* if key is down or up */
    bool (*allup_key)(void)
    )
{
	int lmchar;		/* Lisp Machine charachter to insert */
	int scc;		/* Space Cadet scancode. */
	int wantshift;		/* Index into second column in cadet_kbd_map. */
	int shkey;		/* Shift key being pressed. */
	int oshift;

		iob_csr &= ~(1 << 4);	/* Clear CSR<4>. */
		break;
	case 0106:
		*pv = (mouse_rawx << 12) | (mouse_rawy << 14) | (mouse_x & 07777);
		INFO(TRACE_IOB | TRACE_UNIBUS, "unibus: mouse x %011o\n", *pv);
		break;
	case 0110:
		INFO(TRACE_IOB | TRACE_UNIBUS, "unibus: beep\n");
		/* 
		 * This is triggered by older code that does a %UNIBUS-READ. 
		 */
// MMcM: It's the number of microseconds between triggers of the
//   flip-flop.  That is, half the wavelength.  So the frequency is, I
//   think, (/ 1e6 (* #o1350 2)).  So I guess 672Hz. And duration is
//   only .13sec.
#if WITH_X11
		x11_beep();
#elif WITH_SDL1

#define KEY_QUEUE_LEN 10

static int key_queue[KEY_QUEUE_LEN];
static int key_queue_optr;
static int key_queue_iptr;
static int key_queue_free = KEY_QUEUE_LEN;


/*
 * Translation map for the host keyboard to a corresponding Lisp
 * Machine character or modifier.
 */
int kbd_map[65535];
int modifier_map[8];


/*
  You hold down all four control and meta keys on your keyboard,
and hit return if you want to use the same virtual memory as now,
or rubout if you want to load a new copy of virtual memory.  Hitting
other keys is undefined.


The incantations used for warm-booting and cold-booting involve holding
down all four control and meta keys simultaneously (the two to the left
of the space bar and the two to the right of the space bar), and striking
RUBOUT for a cold-boot or RETURN for a warm-boot.  This combination
of keys is extremely difficult to type accidentally.


RMS@MIT-AI 01/02/79 05:17:38
To: (BUG LISPM) at MIT-AI
C-M-C-M-digit should load the band for that digit.


;Enter here from the PROM.  Virtual memory is not valid yet.
(LOC 6)
PROM	(JUMP-NOT-EQUAL-XCT-NEXT Q-R A-ZERO PROM)    ;These 2 instructions duplicate the prom
       ((Q-R) ADD Q-R A-MINUS-ONE)
;;; Decide whether to restore virtual memory from saved band on disk, i.e.
;;; whether this is a cold boot or a warm boot.  If the keyboard has input
;;; available, and the character was RETURN (rather than RUBOUT), it's a warm boot.
	(CALL-XCT-NEXT PHYS-MEM-READ)
       ((VMA) (A-CONSTANT 17772045))		;Unibus address 764112 (KBD CSR)
	(JUMP-IF-BIT-CLEAR (BYTE-FIELD 1 5) MD	;If keyboard is not ready,
		COLD-BOOT)			; assume we are supposed to cold-boot
	(CALL-XCT-NEXT PHYS-MEM-READ)
       ((VMA) (A-CONSTANT 17772040))		;Unibus address 764100 (KBD LOW)
	((MD) (BYTE-FIELD 6 0) MD)		;Get keycode
	(JUMP-EQUAL MD (A-CONSTANT 46) COLD-BOOT)	;This is cold-boot if key is RUBOUT
	((MD) (A-CONSTANT 46))			;Standardize mode.  Mostly, set to NORMAL speed
	(CALL-XCT-NEXT PHYS-MEM-WRITE)		;40 is PROM-DISABLE, 2 is NORMAL speed.
       ((VMA) (A-CONSTANT 17773005))		;Unibus 766012
	(JUMP BEG0000)


// ukbd -- cadet prom

;Is request to boot machine if both controls and both metas are held
;down, along with rubout or return.  We have just sent the key-down codes
;for all of those keys.  We now send a boot character, then set a flag preventing
;sending of up-codes until the next down-code.  This gives the machine time

	for (int i = 0; lmchar_map[i].name; i++) {
		if (streq(key, lmchar_map[i].name) == true)
			return lmchar_map[i].lmchar;
	}
	return LMCH_NoSymbol;
}

#include <X11/keysym.h>		// for XK_FOO  meh
#include <X11/X.h>		// for FOOMapIndex  meh

void
kbd_default_map(void)
{
	for (int i = 0; i < (int) NELEM(kbd_map); i++)
		kbd_map[i] = LMCH_NoSymbol;
	for (int i = 0; i < (int) NELEM(modifier_map); i++)

	kbd_map[XK_space] = LMCH_space;
	/* *INDENT-ON* */
}

void
kbd_init(void)
{
//      kbd_default_map();
	if (kbd_type == 0)
		knight_init();
	else
		cadet_init();
}

}

void
mouse_poll(void)
{
	static int prevstate;
	int state;
	enum
	{ Sdisabled, Sopen, Soff, Son };

	state = DTP_FIX_VAL(amem[a_mouse_cursor_state]);
	if (state != prevstate && state == Son) {
		is_mouse_warp = 1;
		mouse_warp_x = DTP_FIX_VAL(amem[a_mouse_x]);
		mouse_warp_y = DTP_FIX_VAL(amem[a_mouse_y]);
	}

#include "kbd.h"
#include "mouse.h"
#include "utrace.h"
#include "idle.h"

SDL_Surface *screen;

#include <X11/keysym.h>		// for XK_FOO  meh
#include <X11/X.h>		// for FOOMapIndex  meh

/*
 * This is shared between x11.c, and sdl1.c ... the only difference is
 * the hook in send_accumulated_updates.
 */

unsigned long Background;

	}
	u_minh = 0x7fffffff;
	u_maxh = 0;
	u_minv = 0x7fffffff;
	u_maxv = 0;
}

static void
sdl1_cleanup(void)
{
	SDL_Quit();
}

/*
 * Returns the X11 modifier index of KEYCODE, or -1 if not found.
 */
static int
sdl1_bucky(SDL_KeyboardEvent e)
{
	int mod = SDL_GetModState();
	if (mod & KMOD_CTRL && (e.keysym.sym == SDLK_LCTRL || e.keysym.sym == SDLK_RCTRL))
		return ControlMapIndex;
	if (mod & KMOD_SHIFT && (e.keysym.sym == SDLK_LSHIFT || e.keysym.sym == SDLK_RSHIFT))
		return ShiftMapIndex;
	if (mod & KMOD_ALT && (e.keysym.sym == SDLK_LALT || e.keysym.sym == SDLK_RALT))
		return Mod1MapIndex;
//      if (mod & KMOD_NUM) return Mod2MapIndex;
//      if (mod & KMOD_MODE) return Mod3MapIndex;
//      if (mod & KMOD_GUI && (e.keysym.sym == SDLK_LGUI || e.keysym.sym == SDLK_RGUI)) return Mod4MapIndex;
//      if (mod & KMOD_SCROLL) return Mod5MapIndex;
	return -1;
}

static int
sdl1_keysym_to_xk(SDL_KeyboardEvent e)
{
	/* *INDENT-OFF* */
	switch (e.keysym.sym) {
	case SDLK_ESCAPE: return XK_Escape;
	case SDLK_F1: return XK_F1;
	case SDLK_F2: return XK_F2;
	case SDLK_F3: return XK_F3;
	case SDLK_F4: return XK_F4;
	case SDLK_F5: return XK_F5;

	case SDLK_LSHIFT: return XK_Shift_L;
	case SDLK_RSHIFT: return XK_Shift_R;
	case SDLK_LCTRL: return XK_Control_L;
	case SDLK_RCTRL: return XK_Control_R;
	case SDLK_CAPSLOCK: return XK_Caps_Lock;
// case ???: return XK_Shift_Lock;

//      case SDLK_LGUI: return XK_Meta_L;
//      case SDLK_RGUI: return XK_Meta_R;
	case SDLK_LALT: return XK_Alt_L;
	case SDLK_RALT: return XK_Alt_R;
//      case SDLK_LSUPER: return XK_Super_L;
//      case SDLK_RSUPER: return XK_Super_R;
//      case SDLK_LHYPER: return XK_Hyper_L;
//      case SDLK_RHYPER: return XK_Hyper_R;

	default: return XK_VoidSymbol;
	}
	/* *INDENT-ON* */
}

bool
cadet_allup_key(void)
{
	bool allup;
	int mods;

/*
 * Takes E, converts it into a LM (hardware) keycode and sends it to
 * the IOB KBD.
 */
static void
process_key(SDL_KeyboardEvent e, int keydown)
{
//      KeySym keysym;
//      SDLKey keycode;
	int keysym;

	int bi;
	unsigned char buf[5];

	idle_keyboard_activity();
	keysym = sdl1_keysym_to_xk(e);
	if (keysym == XK_VoidSymbol || keysym > NELEM(kbd_map)) {
		NOTICE(TRACE_USIM, "kbd (cadet@sdl1): unable to translate to keysym (keysym = 0%o, 0%o)\n", keysym, e.keysym.sym);
		return;
	}
	if (kbd_type == 0) {
		if (!keydown)
			return;
		bi = 0;
//              if (e->xkey.state & ShiftMask)
//                      knight_process_bucky(ShiftMapIndex, &bi);
//              if (e->xkey.state & LockMask)
//                      knight_process_bucky(LockMapIndex, &bi);
//              if (e->xkey.state & ControlMask)
//                      knight_process_bucky(ControlMapIndex, &bi);
//              if (e->xkey.state & Mod1Mask)
//                      knight_process_bucky(Mod1MapIndex, &bi);
//              if (e->xkey.state & Mod2Mask)
//                      knight_process_bucky(Mod2MapIndex, &bi);
//              if (e->xkey.state & Mod3Mask)
//                      knight_process_bucky(Mod3MapIndex, &bi);
//              if (e->xkey.state & Mod4Mask)
//                      knight_process_bucky(Mod4MapIndex, &bi);
//              if (e->xkey.state & Mod5Mask)
//                      knight_process_bucky(Mod5MapIndex, &bi);
		knight_process_key(e.keysym.sym, bi, keydown);
	} else {
		bi = sdl1_bucky(e);
		cadet_process_key(keysym, bi, keydown);
	}
}


}

void
sdl1_init(void)
{
	NOTICE(TRACE_USIM, "tv: using SDL1 backend for monitor and keyboard\n");

	Foreground = 0xff;	// White
	Background = 0x00;	// Black

	if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE)) {
		fprintf(stderr, "SDL_Init(): %s", SDL_GetError());
		exit(1);
	}
	/*
	 * We still want Ctrl-C to work - undo the SDL redirections.

/* sdl2.c --- SDL2 routines used by the TV and KBD interfaces
 */

#include <signal.h>

#include <SDL.h>

#include "tv.h"
#include "kbd.h"
#include "mouse.h"
#include "utrace.h"
#include "idle.h"

#include <X11/keysym.h>		// for XK_FOO  meh
#include <X11/X.h>		// for FOOMapIndex  meh

SDL_Window *window;
SDL_Renderer *renderer;
SDL_Texture *texture;

/*
 * This is shared between x11.c, and sdl2.c ... the only difference is

	if (v + vs > u_maxv)
		u_maxv = v + vs;
}

static void
send_accumulated_updates(void)
{
//      int hs;
//      int vs;

//      hs = u_maxh - u_minh;
//      vs = u_maxv - u_minv;
//      if (u_minh != 0x7fffffff && u_minv != 0x7fffffff && u_maxh && u_maxv) {
	SDL_UpdateTexture(texture, NULL, tv_bitmap, tv_width * sizeof(Uint32));
	// Flush
	SDL_RenderClear(renderer);
	SDL_RenderCopy(renderer, texture, NULL, NULL);
	SDL_RenderPresent(renderer);
//      }
//      u_minh = 0x7fffffff;
//      u_maxh = 0;
//      u_minv = 0x7fffffff;
//      u_maxv = 0;
}

//typedef struct SDL_Keysym
//{
//    SDL_Scancode scancode;      /**< SDL physical key code - see SDL_Scancode for details */
//    SDL_Keycode sym;            /**< SDL virtual key code - see SDL_Keycode for details */
//    Uint16 mod;                 /**< current key modifiers */
//    Uint32 unused;
//} SDL_Keysym;

int
sdl2_bucky(SDL_KeyboardEvent e)
{
	int mod = SDL_GetModState();
	if (mod & KMOD_CTRL && (e.keysym.sym == SDLK_LCTRL || e.keysym.sym == SDLK_RCTRL))
		return ControlMapIndex;
	if (mod & KMOD_SHIFT && (e.keysym.sym == SDLK_LSHIFT || e.keysym.sym == SDLK_RSHIFT))
		return ShiftMapIndex;
	if (mod & KMOD_ALT && (e.keysym.sym == SDLK_LALT || e.keysym.sym == SDLK_RALT))
		return Mod1MapIndex;
//      if (mod & KMOD_NUM) return Mod2MapIndex;
//      if (mod & KMOD_MODE) return Mod3MapIndex;
	if (mod & KMOD_GUI && (e.keysym.sym == SDLK_LGUI || e.keysym.sym == SDLK_RGUI))
		return Mod4MapIndex;
//      if (mod & KMOD_SCROLL) return Mod5MapIndex;
	return -1;
}

int
sdl2_keysym_to_xk(SDL_KeyboardEvent e)
{
	/* *INDENT-OFF* */
	switch (e.keysym.sym) {
	case SDLK_ESCAPE: return XK_Escape;
	case SDLK_F1: return XK_F1;
	case SDLK_F2: return XK_F2;
	case SDLK_F3: return XK_F3;
	case SDLK_F4: return XK_F4;
	case SDLK_F5: return XK_F5;

	case SDLK_CAPSLOCK: return XK_Caps_Lock;
// case ???: return XK_Shift_Lock;

	case SDLK_LGUI: return XK_Meta_L;
	case SDLK_RGUI: return XK_Meta_R;
	case SDLK_LALT: return XK_Alt_L;
	case SDLK_RALT: return XK_Alt_R;
//      case SDLK_LSUPER: return XK_Super_L;
//      case SDLK_RSUPER: return XK_Super_R;
//      case SDLK_LHYPER: return XK_Hyper_L;
//      case SDLK_RHYPER: return XK_Hyper_R;

	default: return XK_VoidSymbol;
	}
	/* *INDENT-ON* */
}

bool
cadet_allup_key(void)
{
	bool allup;
	int mods;

	}
	return allup;
}

static void
process_key(SDL_KeyboardEvent e, int keydown)
{
//      KeySym keysym;
//      SDLKey keycode;

	int bi;
	int keysym;

	idle_keyboard_activity();
	keysym = sdl2_keysym_to_xk(e);
	if (keysym == XK_VoidSymbol || keysym > NELEM(kbd_map)) {

		int mod = SDL_GetModState();
		if (mod & KMOD_SHIFT)
			knight_process_bucky(ShiftMapIndex, &bi);
		if (mod & KMOD_CAPS)
			knight_process_bucky(LockMapIndex, &bi);
		if (mod & KMOD_CTRL)
			knight_process_bucky(ControlMapIndex, &bi);
//              if (mod & Mod1Mask)
//                      knight_process_bucky(Mod1MapIndex, &bi);
//              if (mod & Mod2Mask)
//                      knight_process_bucky(Mod2MapIndex, &bi);
//              if (mod & Mod3Mask)
//                      knight_process_bucky(Mod3MapIndex, &bi);
//              if (mod & Mod4Mask)
//                      knight_process_bucky(Mod4MapIndex, &bi);
//              if (mod & Mod5Mask)
//                      knight_process_bucky(Mod5MapIndex, &bi);
		knight_process_key(e.keysym.sym, bi, keydown);
	} else {
		bi = sdl2_bucky(e);
		cadet_process_key(keysym /* xk_keysym */ , bi, keydown, &cadet_allup_key);
	}
}

void
sdl2_event(void)
{
	SDL_Event ev;

	send_accumulated_updates();
	kbd_dequeue_key_event();
	if (is_mouse_warp) {
		is_mouse_warp = 0;
		SDL_WarpMouseInWindow(window, mouse_warp_x, mouse_warp_y);
	}
	while (SDL_PollEvent(&ev)) {
		switch (ev.type) {
		case SDL_WINDOWEVENT:
			SDL_UpdateTexture(texture, NULL, tv_bitmap, tv_width * sizeof(Uint32));
			// flush
			SDL_RenderClear(renderer);
			SDL_RenderCopy(renderer, texture, NULL, NULL);
			SDL_RenderPresent(renderer);
			break;
		case SDL_KEYDOWN:
			process_key(ev.key, 1);

float xbeep_volume = 1.0f;
int AMPLITUDE = 28000;
const int SAMPLE_RATE = 44100;

int xbeep_sample_nr = 0;
float xbeep_freq = 0.0f;

void
xbeep_audio_callback(void *user_data, Uint8 *raw_buffer, int bytes)
{
	Sint16 *buffer = (Sint16 *) raw_buffer;
	int length = bytes / 2;	// 2 bytes per sample for AUDIO_S16SYS
	float *freq = (float *) (user_data);
	int amp = AMPLITUDE * xbeep_volume;

	for (int i = 0; i < length; i++, xbeep_sample_nr++) {
		double time = (double) xbeep_sample_nr / (double) SAMPLE_RATE;
		buffer[i] = (Sint16) (amp * sin(2.0f * M_PI * (*freq) * time));	// render sine wave
	}
}

void
xbeep_audio_init(void)
{
	SDL_AudioSpec want;
	SDL_AudioSpec have;

	want.freq = SAMPLE_RATE;
	want.format = AUDIO_S16SYS;
	want.channels = 1;
	want.samples = 2048;
	want.callback = xbeep_audio_callback;
	want.userdata = &xbeep_freq;
	if (SDL_OpenAudio(&want, &have) != 0)
		SDL_LogError(SDL_LOG_CATEGORY_AUDIO, "Failed to open audio: %s", SDL_GetError());
	if (want.format != have.format)
		SDL_LogError(SDL_LOG_CATEGORY_AUDIO, "Failed to get the desired AudioSpec");
	SDL_PauseAudio(1);
}

void
xbeep_audio_close(void)
{
	SDL_CloseAudio();
}

void
xbeep(int halfwavelength, int duration)
{
	xbeep_freq = 1000000.0f / (float) (halfwavelength * 2);
	xbeep_sample_nr = 0;

	SDL_PauseAudio(0);
	SDL_Delay(duration / 1000);
	SDL_PauseAudio(1);
}

void
sdl2_beep(int v)
{
///XBEEP (MISC-INST-ENTRY %BEEP)
///;;; First argument is half-wavelength, second is duration.  Both are in microseconds.
///;;; M-1 has 2nd argument (duration) which is added to initial time-check
///;;; M-2 contains most recent time check
///;;;     to compute quitting time
///;;; M-C contains 1st argument, the wavelength
///;;; M-4 contains the time at which the next click must be done.
///;;; Note that the 32-bit clock wraps around once an hour, we have to be careful
///;;; to compare clock values in the correct way, namely without overflow checking.
	extern uint32_t mmem[32];
#define DTP_FIX_VAL(x) ((x) & ((1 << 24) - 1))
#define DTP_FIX(x) (DTP_FIX_VAL(x) | 5 << 25)
	int wavelength = DTP_FIX_VAL(mmem[7]);	//M-C M-MEM 7
	int duration = DTP_FIX_VAL(mmem[22]);	//M-1 M-MEM 22
	xbeep(wavelength, duration);
}

void
sdl2_init(void)
{
	NOTICE(TRACE_USIM, "tv: using SDL2 backend for monitor and keyboard\n");

	Foreground = 0xffffff;	// White
	Background = 0x000000;	// Black

	xbeep_audio_init();
	SDL_CreateWindowAndRenderer(tv_width, tv_height, SDL_WINDOW_OPENGL, &window, &renderer);
	SDL_ShowCursor(0);	/* Invisible cursor. */

//      SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
//      SDL_RenderClear(renderer);
//      SDL_RenderPresent(renderer);

	SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");	// make the scaled rendering look smoother.
	SDL_RenderSetLogicalSize(renderer, tv_width, tv_height);

	texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, tv_width, tv_height);



}

}

void
tv_xbus_write(uint32_t offset, uint32_t v)
{
	tv_csr = v;
	tv_csr &= ~(1 << 4);

	/*
	 * Handle hardware reverse-video functionality.
	 */
	if ((v & 4) != tv_colorbit) {
		tv_colorbit = v & 4;
		unsigned long temp = Foreground;
		Foreground = Background;
		Background = temp;

		tv_colorbit = v & 4;
		tv_flip_all();
	}
	deassert_xbus_interrupt();
}

void

size_t cycles;

int full_trace_lc = 0;
int full_trace_repeat_counter = 0;
int full_trace_last_lc = 0;


void
run(void)
{
	p1 = 0;
	p0_pc = 0;
	p1_pc = 0;
	inhibit = false;

	 */
	dump_write_header(fd, str4("EOF_"), 0);
	fsync(fd);
	close(fd);
}

void
extra_dump_state(char *suffix)	// Rename function, merge with save_state, and allow for a template or extra parameter (int incremenet?).
{
	char buffer[256];
	static int dump_nr = 0;

	snprintf(buffer, 256, "/tmp/usim-%03d-%s.state", dump_nr++, suffix);
	save_state(buffer);
	printf(".. dumped to file %s\n", buffer);

			printf("LC reached #x%x, dumping state...\n", lc);
			return true;
		}
	}
	return false;
}



int npc_dump_values[256] = { 0 };

int npc_dump_index = 0;


void
add_dump_npc(int npc)
{
	printf("adding npc dump value #x%x\n", npc);
	npc_dump_values[npc_dump_index++] = npc;
}

extern char *sym_find_by_type_val(symtab_t *, symtype_t, uint32_t, int *);
extern int sym_find(symtab_t *, char *, int *);

/// MARK: udiss.c

char *uinst_desc(uint64_t, symtab_t *);


/// MARK: utrace.h ???


extern void run(void);


void add_dump_lc(int lc);
void add_dump_npc(int lc);
void add_trace_vmem(int vmem);

struct page_s
{

void trace_pdlidx_read(int value);
void trace_pdlptr_read(int value);
void trace_pdlidx_write(int value);
void trace_pdlptr_write(int value);
void trace_ucode(void);
void record_pc_history(int pc);
void check_npc_dump();

	switch (m) {
	case 0:
		type_field(MMEM, u, 032, 006);
		break;
	case 1:
		fsource = load_byte(u, 032, 005);
		switch (fsource) {
		case 0:
			PRIN1SP("READ-I-ARG");
			break;
		case 1:
			PRIN1SP("MICRO-STACK-PNTR-AND-DATA");
			break;
		case 2:
			PRIN1SP("PDL-BUFFER-POINTER");
			break;
		case 3:
			PRIN1SP("PDL-BUFFER-INDEX");
			break;
		case 4:
			PRIN1SP("FSOURCE-%o", fsource);
			break;
		case 5:
			PRIN1SP("C-PDL-BUFFER-INDEX");
			break;
		case 6:
			PRIN1SP("C-OPC-BUFFER");
			break;
		case 7:
			PRIN1SP("Q-R");
			break;
		case 8:
			PRIN1SP("VMA");
			break;
		case 9:
			PRIN1SP("MEMORY-MAP-DATA");
			break;
		case 10:
			PRIN1SP("MD");
			break;
		case 11:
			PRIN1SP("LOCATION-COUNTER");
			break;
		case 12:
			PRIN1SP("MICRO-STACK-PNTR-AND-DATA-POP");
			break;
		case 13 ... 19:
			PRIN1SP("FSOURCE-%o", fsource);
			break;
		case 20:
			PRIN1SP("C-PDL-BUFFER-POINTER-POP");
			break;
		case 21:
			PRIN1SP("C-PDL-BUFFER-POINTER");
			break;
		case 22:
			PRIN1SP("FSOURCE-%o", fsource);
			break;
		case 23 ... 31:
			PRIN1SP("FSOURCE-%o", fsource);
			break;
		}
	}
}

static void
q_dest_desc(uint64_t u)
{

m_dest_desc(uint64_t u)
{
	int fdest;

	type_field(MMEM, u, 016, 005);
	fdest = load_byte(u, 023, 005);
	switch (fdest) {
	case 0:
		break;
	case 1:
		PRIN1SP("LOCATION-COUNTER");
		break;
	case 2:
		PRIN1SP("INTERRUPT-CONTROL");
		break;
	case 3 ... 7:
		PRIN1SP("FDEST-%o", fdest);
		break;
	case 8:
		PRIN1SP("C-PDL-BUFFER-POINTER");
		break;
	case 9:
		PRIN1SP("C-PDL-BUFFER-POINTER-PUSH");
		break;
	case 10:
		PRIN1SP("C-PDL-BUFFER-INDEX");
		break;
	case 11:
		PRIN1SP("PDL-BUFFER-INDEX");
		break;
	case 12:
		PRIN1SP("PDL-BUFFER-POINTER");
		break;
	case 13:
		PRIN1SP("MICRO-STACK-DATA-PUSH");
		break;
	case 14:
		PRIN1SP("OA-REG-LOW");
		break;
	case 15:
		PRIN1SP("OA-REG-HI");
		break;
	case 16:
		PRIN1SP("VMA");
		break;
	case 17:
		PRIN1SP("VMA-START-READ");
		break;
	case 18:
		PRIN1SP("VMA-START-WRITE");
		break;
	case 19:
		PRIN1SP("VMA-WRITE-MAP");
		break;
	case 20 ... 23:
		PRIN1SP("FDEST-%o", fdest);
		break;
	case 24:
		PRIN1SP("MD");
		break;
	case 25:
		PRIN1SP("FDEST-%o", fdest);
		break;
	case 26:
		PRIN1SP("MD-START-WRITE");
		break;
	case 27:
		PRIN1SP("MD-WRITE-MAP");
		break;
	case 28 ... 31:
		PRIN1SP("FDEST-%o", fdest);
		break;
	}
}

static void
dest_desc_1(uint64_t u)
{
	int dest;
	int alu;

	PRIN1(" (");
	dest = load_byte(u, 031, 001);
	switch (dest) {
	case 0:
		m_dest_desc(u);
		break;
	case 1:
		a_dest_desc(u);
		break;
	}
	alu = load_byte(u, 053, 002);
	dest = load_byte(u, 000, 002);
	if (alu == 0 && dest == 3)
		PRIN1("Q-R");
	PRIN1(") ");
}

	int mf;
	int q;
	int alu;
	int ilong;

	dest_desc(u);
	alu_function = load_byte(u, 003, 006);
	switch (alu_function) {
	case 0:
		PRIN1SP("SETZ");
		break;
	case 1:
		PRIN1SP("AND");
		break;
	case 2:
		PRIN1SP("ANDCA");
		break;
	case 3:
		PRIN1SP("SETM");
		break;
	case 4:
		PRIN1SP("ANDCM");
		break;
	case 5:		/* SETA */
		break;
	case 6:
		PRIN1SP("XOR");
		break;
	case 7:
		PRIN1SP("IOR");
		break;
	case 8:
		PRIN1SP("ANDCB");
		break;
	case 9:
		PRIN1SP("EQV");
		break;
	case 10:
		PRIN1SP("SETCA");
		break;
	case 11:
		PRIN1SP("ORCA");
		break;
	case 12:
		PRIN1SP("SETCM");
		break;
	case 13:
		PRIN1SP("ORCM");
		break;
	case 14:
		PRIN1SP("ORCB");
		break;
	case 15:
		PRIN1SP("SETO");
		break;
	case 16 ... 21:
		PRIN1SP("ALU-FUNCTION-%o", alu_function);
		break;
	case 22:
		PRIN1SP("SUB");
		break;
	case 23 ... 24:
		PRIN1SP("ALU-FUNCTION-%o", alu_function);
		break;
	case 25:
		PRIN1SP("ADD");
		break;
	case 26 ... 27:
		PRIN1SP("ALU-FUNCTION-%o", alu_function);
		break;
	case 28:
		PRIN1SP("INCM");
		break;
	case 29 ... 30:
		PRIN1SP("ALU-FUNCTION-%o", alu_function);
		break;
	case 31:
		PRIN1SP("LSHM");
		break;
	case 32:
		PRIN1SP("MUL");
		break;
	case 33:
		PRIN1SP("DIV");
		break;
	case 34 ... 36:
		PRIN1SP("ALU-FUNCTION-%o", alu_function);
		break;
	case 37:
		PRIN1SP("DIVRC");
		break;
	case 38 ... 40:
		PRIN1SP("ALU-FUNCTION-%o", alu_function);
		break;
	case 41:
		PRIN1SP("DIVFS");
		break;
	case 42 ... 63:
		PRIN1SP("ALU-FUNCTION-%o", alu_function);
		break;
	}
	alu = load_byte(u, 003, 006);
	if (alu == 026)
		sub_carry_desc(u);
	else
		normal_carry_desc(u);
	output_selector = load_byte(u, 014, 002);
	switch (output_selector) {
	case 0:
		PRIN1SP("OUTPUT-SELECTOR-%o", output_selector);
		break;
	case 1:
		break;
	case 2:
		PRIN1SP("OUTPUT-SELECTOR-RIGHTSHIFT-1");
		break;
	case 3:
		PRIN1SP("OUTPUT-SELECTOR-LEFTSHIFT-1");
		break;
	}
	q = load_byte(u, 000, 002);
	switch (q) {
	case 0:
		break;
	case 1:
		PRIN1SP("SHIFT-Q-LEFT");
		break;
	case 2:
		PRIN1SP("SHIFT-Q-RIGHT");
		break;
	case 3:
		break;
	}
	m_source_desc(u);
	type_field(AMEM, u, 040, 012);
	mf = load_byte(u, 012, 002);
	switch (mf) {
	case 0:
		break;
	case 1 ... 3:
		PRIN1SP("MF-%o", mf);
		break;
	}
	ilong = load_byte(u, 055, 001);
	switch (ilong) {
	case 0:
		break;
	case 1:
		PRIN1SP("ILONG");
		break;
	}
}

static void
type_jump_condition(int number)
{
	switch ((number & 01400) >> 010) {
	case 0:
		PRIN1("JUMP");
		break;
	case 1:
		PRIN1("CALL");
		break;
	case 2:
		PRIN1("POPJ");
		break;
	case 3:
	default:
		PRIN1("CALL-POPJ-??");
		break;
	}
	if ((040 & number) == 0) {
		PRIN1("-IF-BIT-");
		if ((0100 & number) == 0)
			PRIN1("Set");
		else
			PRIN1("Clear");

		int cond;

		if ((0100 & number) == 0)
			cond = 07 & number;
		else
			cond = (07 & number) + 010;
		switch (cond) {
		case 0:
			tem = "T";
			break;
		case 1:
			tem = "-LESS-THAN";
			break;
		case 2:
			tem = "-LESS-OR-EQUAL";
			break;
		case 3:
			tem = "-EQUAL";
			break;
		case 4:
			tem = "-IF-PAGE-FAULT";
			break;
		case 5:
			tem = "-IF-PAGE-FAULT-OR-INTERRUPT";
			break;
		case 6:
			tem = "-IF-SEQUENCE-BREAK";
			break;
		case 7:
			tem = "NIL";
			break;
		case 8:
			tem = "T";
			break;
		case 9:
			tem = "-GREATER-OR-EQUAL";
			break;
		case 10:
			tem = "-GREATER-THAN";
			break;
		case 11:
			tem = "-NOT-EQUAL";
			break;
		case 12:
			tem = "-IF-NO-PAGE-FAULT";
			break;
		case 13:
			tem = "-IF-NO-PAGE-FAULT-OR-INTERRUPT";
			break;
		case 14:
			tem = "-IF-NO-SEQUENCE-BREAK";
			break;
		case 15:
			tem = "-NEVER";
			break;
		default:
			tem = NULL;
			break;
		}
		if (strcmp(tem, "T") == 0) {
			if ((0200 & number) == 0)
				PRIN1("-XCT-NEXT");
			PRIN1(" JUMP-CONDITION ");
			PRIN1("%o", 07 & number);
			if ((0100 & number) == 0)
				PRIN1("(Inverted)");
		} else {
			if (strcmp(tem, "NIL") != 0)
				PRIN1("%s", tem);
			if ((0200 & number) == 0)
				PRIN1("-XCT-NEXT");

	type_jump_condition(load_byte(u, 000, 012));
	m_source_desc(u);
	type_field(AMEM, u, 040, 012);
	type_field(IMEM, u, 014, 016);
	mf = load_byte(u, 012, 002);
	switch (mf) {
	case 0:
		break;
	case 1 ... 3:
		PRIN1SP("MF-%o", mf);
		break;
	}
	ilong = load_byte(u, 055, 001);
	switch (ilong) {
	case 0:
		break;
	case 1:
		PRIN1SP("ILONG");
		break;
	}
}

static void
dsp_const_desc(uint64_t u)
{
	PRIN1(" (");

	int ilong;
	int push_own_address_p;
	int ifetch_p;
	int disp_const;

	PRIN1SP("DISPATCH");
	disp_const = load_byte(u, 040, 012);
	if (disp_const == 0);

	else
		dsp_const_desc(u);
	byte_field_out(u, load_byte(u, 000, 010), true, false);
	m_source_desc(u);
	type_field(DMEM, u, 014, 013);
	push_own_address_p = load_byte(u, 031, 001);
	if (push_own_address_p == 1)
		PRIN1SP("PUSH-OWN-ADDRESS");
	ifetch_p = load_byte(u, 030, 001);
	if (ifetch_p == 1)
		PRIN1SP("IFETCH");
	map = load_byte(u, 010, 002);
	switch (map) {
	case 0:
		break;
	case 1:
		PRIN1SP("MAP-14");
		break;
	case 2:
		PRIN1SP("MAP-15");
		break;
	case 3:
		PRIN1SP("MAP-BOTH-14-AND-15");
		break;
	}
	mf = load_byte(u, 012, 002);
	switch (mf) {
	case 0:
		break;
	case 1 ... 3:
		PRIN1SP("MF-%o", mf);
		break;
	}
	ilong = load_byte(u, 055, 001);
	switch (ilong) {
	case 0:
		break;
	case 1:
		PRIN1SP("ILONG");
		break;
	}
}

static void
byt_desc(uint64_t u)
{
	int byte_operation;
	int mf;
	int ilong;

	dest_desc(u);
	byte_operation = load_byte(u, 014, 002);
	switch (byte_operation) {
	case 0:
		PRIN1SP("BYTE-OPERATION-%o", byte_operation);
		break;
	case 1:
		PRIN1SP("LDB");
		break;
	case 2:
		PRIN1SP("SELECTIVE-DEPOSIT");
		break;
	case 3:
		PRIN1SP("DPB");
		break;
	}
	byte_field_out(u, load_byte(u, 000, 012), false, true);
	m_source_desc(u);
	type_field(AMEM, u, 040, 012);
	mf = load_byte(u, 012, 002);
	switch (mf) {
	case 0:
		break;
	case 1 ... 3:
		PRIN1SP("MF-%o", mf);
		break;
	}
	ilong = load_byte(u, 055, 001);
	switch (ilong) {
	case 0:
		break;
	case 1:
		PRIN1SP("ILONG");
		break;
	}
}

/*
 * Modify S so that there are no spaces after opening parenthesis, and
 * before closing parenthesis.
 */

	uinstbuf[0] = '\0';
	uinstbufp = uinstbuf;
	uinstsymtab = *symtab;
	PRIN1("(");
	popj_after_next_p = load_byte(u, 052, 001);
	switch (popj_after_next_p) {
	case 0:
		break;
	case 1:
		PRIN1SP("POPJ-AFTER-NEXT");
		break;
	}
	opclass = load_byte(u, 053, 002);
	switch (opclass) {
	case 0:
		alu_desc(u);
		break;
	case 1:
		jmp_desc(u);
		break;
	case 2:
		dsp_desc(u);
		break;
	case 3:
		byt_desc(u);
		break;
	}
	stat_bit = load_byte(u, 056, 001);
	switch (stat_bit) {
	case 0:
		break;
	case 1:
		PRIN1SP("STAT-BIT");
		break;
	}
	bit_47 = load_byte(u, 057, 001);
	switch (bit_47) {
	case 0:
		break;
	case 1:
		PRIN1SP("BIT-47");
		break;
	}
	PRIN1(")");
	uinst_strip(uinstbuf);
	return uinstbuf;
}

int alu_carry;
uint32_t alu_out;

bool oal;
bool oah;

uint32_t out;


uint64_t
ir(int pos, int len)
{
	return ((uint64_t) (p0 >> pos)) & ((1 << len) - 1);
}


 */
int
advanceLC(int ppc)
{
	int old_lc;

	record_lc_history();
	old_lc = mfmem[1] & 0377777777;	/* LC is 26 bits. */
	if (should_dump_lc(old_lc)) {
		char buffer[256];

		snprintf(buffer, 256, "lc-%d", old_lc);
		extra_dump_state(buffer);
	}
	if (interrupt_control & (1 << 29)) {
		mfmem[1]++;	/* Byte mode. */
	} else {
		mfmem[1] += 2;	/* 16-bit mode. */
	}
	/*
	 * NEED-FETCH?
	 */
	if (mfmem[1] & (1UL << 31UL)) {
		mfmem[1] &= ~(1UL << 31UL);
		mfmem[020] = old_lc >> 2;

		int lc1;
		int last_byte_in_word;

		/*
		 * This is ugly, but follows the hardware logic (I
		 * need to distill it to intent but it seems correct).
		 */
		lc0b = (interrupt_control & (1 << 29) ? 1 : 0) &	/* Byte mode. */
		    ((mfmem[1] & 1) ? 1 : 0);	/* LC0. */
		lc1 = (mfmem[1] & 2) ? 1 : 0;
		last_byte_in_word = (~lc0b & ~lc1) & 1;
		DEBUG(TRACE_UCODE, "lc0b %d, lc1 %d, last_byte_in_word %d\n", lc0b, lc1, last_byte_in_word);
		if (last_byte_in_word)
			/*
			 * Set NEED-FETCH.
			 */
			mfmem[1] |= (1UL << 31UL);
	}
	return ppc;
}

uint32_t
mfread(int addr)
{
	int res;

	switch (addr & 037) {
	case 0:
		return mfmem[0];
	case 1:
		return (spcptr << 24) | (spc[spcptr] & 01777777);
	case 2:
		return mfmem[014] & 01777;
	case 3:
		return mfmem[013] & 01777;
	case 5:
		DEBUG(TRACE_MICROCODE, "reading pdl[%o] -> %o\n", mfmem[013], pdl[mfmem[013]]);
		res = pdl[mfmem[013]];
		trace_pdlidx_read(mdata);
		return res;
	case 6:
		return opc;
	case 7:
		return q;
	case 010:
		return mfmem[020];
	case 011:{		/* MEMORY-MAP-DATA */
			uint32_t l2_data;
			uint32_t l1_data;

			l1_data = 0;
			l2_data = 0;

			l2_data = map_vtop(mfmem[030], (int *) &l1_data, (int *) 0);
			return ((uint32_t) write_fault_bit << 31) | ((uint32_t) access_fault_bit << 30) | ((l1_data & 037) << 24) | (l2_data & 077777777);
		}
	case 012:
		return mfmem[030];
	case 013:
		return (interrupt_control & (1 << 29)) ? mfmem[1] : mfmem[1] & ~1;
	case 014:
		res = (spcptr << 24) | (spc[spcptr] & 01777777);
		DEBUG(TRACE_MICROCODE, "reading spc[%o] + ptr -> %o\n", spcptr, mdata);
		spcptr = (spcptr - 1) & 037;
		return res;
	case 024:
		DEBUG(TRACE_MICROCODE, "reading pdl[%o] -> %o, pop\n", mfmem[014], pdl[mfmem[014]]);

	}
}

void
mfwrite(int dest, uint64_t data)
{
	switch (dest >> 5) {
	case 1:		/* LOCATION-COUNTER LC (location counter) 26 bits. */
		DEBUG(TRACE_UCODE, "writing LC <- %o\n", data);
		mfmem[1] = (mfmem[1] & ~0377777777) | (data & 0377777777);
		if (interrupt_control & (1 << 29)) {
			/*
			 * ---!!! Not sure about byte mode...
			 */
		} else {
			/*
			 * In half word mode, low order bit is
			 * ignored.
			 */
			mfmem[1] &= ~1;
		}
		/*
		 * Set NEED-FETCH.
		 */
		mfmem[1] |= (1UL << 31UL);
		break;
	case 2:		/* INTERRUPT-CONTROL Interrupt Control <29-26>. */
		DEBUG(TRACE_UCODE, "writing IC <- %o\n", data);
		interrupt_control = data;
		if (interrupt_control & (1 << 26)) {
			DEBUG(TRACE_UCODE, "ic: sequence break request\n");
		}
		if (interrupt_control & (1 << 27)) {
			DEBUG(TRACE_UCODE, "ic: interrupt enable\n");
		}
		if (interrupt_control & (1 << 28)) {
			DEBUG(TRACE_UCODE, "ic: bus reset\n");
		}
		if (interrupt_control & (1 << 29)) {
			DEBUG(TRACE_UCODE, "ic: lc byte mode\n");
		}
		mfmem[1] = (mfmem[1] & ~(017 << 26)) |	/* Preserve flags. */
		    (interrupt_control & (017 << 26));
		break;
	case 010:		/* C-PDL-BUFFER-POINTER PDL (addressed by pointer) */
		DEBUG(TRACE_UCODE, "writing pdl[%o] <- %o\n", mfmem[014], data);
		trace_pdlptr_write(data);
		pdl[mfmem[014]] = data;
		break;
	case 011:		/* C-PDL-BUFFER-POINTER-PUSH PDL (addressed by pointer, push) */
		mfmem[014] = (mfmem[014] + 1) & 01777;
		DEBUG(TRACE_UCODE, "writing pdl[%o] <- %o, push\n", mfmem[014], data);
		trace_pdlptr_push(data);
		pdl[mfmem[014]] = data;
		break;
	case 012:		/* C-PDL-BUFFER-INDEX PDL (address by index). */
		DEBUG(TRACE_UCODE, "writing pdl[%o] <- %o\n", mfmem[013], data);
		pdl[mfmem[013]] = data;
		trace_pdlidx_write(data);
		break;
	case 013:		/* PDL-BUFFER-INDEX PDL index. */
		DEBUG(TRACE_UCODE, "pdl-index <- %o\n", data);
		mfmem[013] = data & 01777;
		break;
	case 014:		/* PDL-BUFFER-POINTER PDL pointer. */
		DEBUG(TRACE_UCODE, "pdl-ptr <- %o\n", data);
		mfmem[014] = data & 01777;
		break;
	case 015:		/* MICRO-STACK-DATA-PUSH SPC data, push. */
		pushSPC(data);
		break;
	case 016:		/* OA-REG-LO Next instruction modifier (lo). */
		mfmem[016] = data & 0377777777;
		oal = true;
		DEBUG(TRACE_UCODE, "setting oa_reg lo %o\n", mfmem[016]);
		break;
	case 017:		/* OA-REG-HI Next instruction modifier (hi). */
		mfmem[017] = data;
		oah = true;
		DEBUG(TRACE_UCODE, "setting oa_reg hi %o\n", mfmem[017]);
		break;
	case 020:		/* VMA VMA register (memory address). */
		mfmem[020] = data;
		break;
	case 021:		/* VMA-START-READ VMA register, start main memory read. */
		mfmem[020] = data;
		vmRead(mfmem[020], &new_md);
		new_md_delay = 2;
		break;
	case 022:		/* VMA-START-WRITE VMA register, start main memory write. */
		mfmem[020] = data;
		vmWrite(mfmem[020], mfmem[030]);
		break;
	case 023:		/* VMA-WRITE-MAP VMA register, write map. */
		mfmem[020] = data;
		DEBUG(TRACE_VM, "vma-write-map md=%o, vma=%o (addr %o)\n", mfmem[030], mfmem[020], mfmem[030] >> 13);
		mapWrite();
		break;
	case 030:		/* MEMORY-DATA MD register (memory data). */
		mfmem[030] = data;
		DEBUG(TRACE_UCODE, "md<-%o\n", mfmem[030]);
		break;
	case 031:		/* MEMORY-DATA-START-READ */
		mfmem[030] = data;
		vmRead(mfmem[020], &new_md);
		new_md_delay = 2;
		break;
	case 032:		/* MEMORY-DATA-START-WRITE */
		mfmem[030] = data;
		vmWrite(mfmem[020], mfmem[030]);
		break;
	case 033:		/* MEMORY-DATA-WRITE-MAP MD register, write map (like 23). */
		mfmem[030] = data;
		DEBUG(TRACE_UCODE, "memory-data-write-map md=%o, vma=%o (addr %o)\n", mfmem[030], mfmem[020], mfmem[030] >> 13);
		mapWrite();
		break;
	}
}


		alu_carry = (lv >> 32) ? 1 : 0;
		break;
	case 025:
		lv = (int64_t) (mdata | ~adata) + (mdata & adata) + (cin ? 1 : 0);
		alu_out = (uint32_t) lv;
		alu_carry = (lv >> 32) ? 1 : 0;
		break;
	case 026:		/* [M-A-1] [SUB] */
		sub32(mdata, adata, cin, alu_out, alu_carry);
		break;
	case 027:
		lv = (int64_t) (mdata | ~adata) + mdata + (cin ? 1 : 0);
		alu_out = (uint32_t) lv;
		alu_carry = (lv >> 32) ? 1 : 0;
		break;
	case 030:
		lv = (int64_t) (mdata | adata) + (cin ? 1 : 0);
		alu_out = (uint32_t) lv;
		alu_carry = (lv >> 32) ? 1 : 0;
		break;
	case 031:		/* [ADD] [M+A+1] */
		add32(mdata, adata, cin, alu_out, alu_carry);
		break;
	case 032:
		lv = (int64_t) (mdata | adata) + (mdata & ~adata) + (cin ? 1 : 0);
		alu_out = (uint32_t) lv;
		alu_carry = (lv >> 32) ? 1 : 0;
		break;
	case 033:
		lv = (int64_t) (mdata | adata) + mdata + (cin ? 1 : 0);
		alu_out = (uint32_t) lv;
		alu_carry = (lv >> 32) ? 1 : 0;
		break;
	case 034:		/* [M+1] */
		alu_out = mdata + (cin ? 1 : 0);
		alu_carry = 0;
		if (mdata == (int) 0xffffffff && cin)
			alu_carry = 1;
		break;
	case 035:
		lv = (int64_t) mdata + (mdata & adata) + (cin ? 1 : 0);
		alu_out = (uint32_t) lv;
		alu_carry = (lv >> 32) ? 1 : 0;
		break;
	case 036:
		lv = (int64_t) mdata + (mdata | ~adata) + (cin ? 1 : 0);
		alu_out = (uint32_t) lv;
		alu_carry = (lv >> 32) ? 1 : 0;
		break;
	case 037:		/* [M+M] [M+M+1] */
		add32(mdata, mdata, cin, alu_out, alu_carry);
		break;
	}
}

void
logiOps(int op)
{
	switch (op) {
	case 000:
		alu_out = 0;
		break;
	case 001:
		alu_out = mdata & adata;
		break;
	case 002:
		alu_out = mdata & ~adata;
		break;
	case 003:
		alu_out = mdata;
		break;
	case 004:
		alu_out = ~mdata & adata;
		break;
	case 005:
		alu_out = adata;
		break;
	case 006:
		alu_out = mdata ^ adata;
		break;
	case 007:
		alu_out = mdata | adata;
		break;
	case 010:
		alu_out = ~adata & ~mdata;
		break;
	case 011:
		alu_out = adata == mdata;
		break;
	case 012:
		alu_out = ~adata;
		break;
	case 013:
		alu_out = mdata | ~adata;
		break;
	case 014:
		alu_out = ~mdata;
		break;
	case 015:
		alu_out = ~mdata | adata;
		break;
	case 016:
		alu_out = ~mdata | ~adata;
		break;
	case 017:
		alu_out = ~0;
		break;
	}
}

void
divOps(int op)
{
	int cin = ir(2, 1);

			break;
		}
	}
	disp_addr &= 03777;
	DEBUG(TRACE_MICROCODE, "dispatch[%o] -> %o ", disp_addr, dmem[disp_addr]);
	disp_addr = dmem[disp_addr];
	mfmem[0] = disp_const;
	target = disp_addr & 037777;	/* 14 bits. */
	n = (disp_addr >> 14) & 1;
	p = (disp_addr >> 15) & 1;
	r = (disp_addr >> 16) & 1;
	DEBUG(TRACE_MICROCODE, "%s%s%s\n", n ? "N " : "", p ? "P " : "", r ? "R " : "");
	if (n_plus1 && n) {
		npc--;
	}

		int rot = ir(0, 5);

		DEBUG(TRACE_MICROCODE, "jump-if-bit; rot %o, before %o ", rot, mdata);
		mdata = rol32(mdata, rot);
		DEBUG(TRACE_MICROCODE, "after %o\n", mdata);
		return mdata & 1;
	}

	// Internal condition.
	switch (ir(0, 4)) {
	case 0:		/* illegal ??? */
		break;
	case 1:
		return mdata < adata;
	case 2:
		return mdata <= adata;
	case 3:
		return mdata == adata;
	case 4:
		return page_fault_flag;	/* vmaok */
	case 5:
		DEBUG(TRACE_MICROCODE, "jump i|pf\n");	/* pgf.or.int */
		return page_fault_flag | (interrupt_control & (1 << 27) ? interrupt_pending_flag : 0);

	case 6:
		DEBUG(TRACE_MICROCODE, "jump i|pf|sb\n");	/* pgf.or.int.sb */
		return page_fault_flag | (interrupt_control & (1 << 27) ? interrupt_pending_flag : 0) | (interrupt_control & (1 << 26));
	case 7:
		return 1;
	}
}

void
jmp(void)
{
	int target = ir(12, 14);

	int left_mask_index;
	uint32_t left_mask;
	uint32_t right_mask;
	int right_mask_index;

	right_mask_index = pos;
	left_mask_index = (right_mask_index + widthm1) & 037;	/* mod 32? */
	left_mask = ~0;
	right_mask = ~0;
	left_mask >>= 31 - left_mask_index;
	right_mask <<= right_mask_index;

	//DEBUG(TRACE_MICROCODE, "widthm1 %o, pos %o, mr_sr_bits %o\n", widthm1, pos, mr_sr_bits);
	DEBUG(TRACE_MICROCODE, "left_mask_index %o, right_mask_index %o\n", left_mask_index, right_mask_index);
	DEBUG(TRACE_MICROCODE, "left_mask %o, right_mask %o, mask %o\n", left_mask, right_mask, left_mask & right_mask);
	return left_mask & right_mask;
}

void
byt(void)
{
	int dest = ir(14, 12);
	int mr_sr_bits = ir(12, 2);
	int pos = ir(0, 5);	// p0 & 037;

	uint32_t mask;

	DEBUG(TRACE_MICROCODE, "a=%o (%o), m=%o (%o), dest=%o\n", aaddr, adata, maddr, mdata, dest);

	if (ir(10, 2) == 3)
		pos = lcbytemode();

	popj = ir(42, 1);
	aaddr = ir(32, 10);
	maddr = ir(26, 5);
	adata = amem[aaddr];
	mdata = (ir(31, 1) == 0) ? mmem[maddr] : mfread(maddr);
	op = ir(43, 2);
	switch (op) {
	case 0:
		alu();
		break;
	case 1:
		jmp();
		break;
	case 2:
		dsp();
		break;
	case 3:
		byt();
		break;
	}
	if (popj) {
		int old_npc;

		DEBUG(TRACE_MICROCODE, "popj; ");
		old_npc = npc;
		npc = popSPC();

			DEBUG(TRACE_KBD, "cadet_allup_key() - found a key that is up which is not a shift; keymap[%d] = 0%o\n", i, keymap[i]);
			allup = false;
			break;
		}
	}
	if (allup == true) {
		DEBUG(TRACE_KBD, "cadet_allup_key() - all-up event; mods = 0%o, shifts = 0%o\n", mods, shifts);
		cadet_shifts = shifts;	/* Keep track of shifts.  */
		cadet_allup_event(mods);	/* Generate all-up event. */
	}
	return allup;
}

/*
 * Takes E, converts it into a LM (hardware) keycode and sends it to
 * the IOB KBD.
 */
static void
process_key(XEvent *e, int keydown)
{
	KeySym keysym;
	KeyCode keycode;
	static XComposeStatus status;
	int bi;
	unsigned char buf[5];

	idle_keyboard_activity();
	XLookupString(&e->xkey, (char *) buf, sizeof(buf), &keysym, &status);
	keycode = x11_keysym_to_keycode(keysym);
	if (keycode == NoSymbol || keysym > NELEM(kbd_map)) {
		NOTICE(TRACE_USIM, "kbd (cadet@x11): unable to translate to keycode (keysym = 0%o)\n", keysym);
		return;
	}
	if (kbd_type == 0) {
		if (!keydown)

	XKeyboardControl kc;
	XKeyboardControl okc;
	static int onoff = 100;

	onoff = -onoff;

	XGetKeyboardControl(display, &okc);
	kc.key_click_percent = 0;	/* 0 - 100 */
	kc.bell_percent = 100;	/* 0 - 100 */
	kc.bell_pitch = 755;	/* Hz */
	kc.bell_duration = 10;	/* milliseconds */
	XChangeKeyboardControl(display, KBBellPercent | KBBellPitch | KBBellDuration, &kc);
	XBell(display, onoff);	/* display, percent */
	XChangeKeyboardControl(display, KBBellPercent | KBBellPitch | KBBellDuration, &okc);
}

void
x11_event(void)