#include "adsp2100.h"

#define DASMFLAG_SUPPORTED		0x80000000	/* are disassembly flags supported? */
#define DASMFLAG_STEP_OUT		0x40000000	/* this instruction should be the end of a step out sequence */
#define DASMFLAG_STEP_OVER		0x20000000	/* this instruction should be stepped over by setting a breakpoint afterwards */
#define DASMFLAG_OVERINSTMASK	0x18000000	/* number of extra instructions to skip when stepping over */
#define DASMFLAG_OVERINSTSHIFT	27			/* bits to shift after masking to get the value */
#define DASMFLAG_LENGTHMASK 	0x0000ffff	/* the low 16-bits contain the actual length */
#define DASMFLAG_STEP_OVER_EXTRA(x)			((x) << DASMFLAG_OVERINSTSHIFT)

static const char *const flag_change[] = { "", "TOGGLE %s ", "RESET %s ", "SET %s " };
static const char *const mode_change[] = { "", "", "DIS %s ", "ENA %s " };

static const char *const alu_xop[] = { "AX0", "AX1", "AR", "MR0", "MR1", "MR2", "SR0", "SR1" };
static const char *const alu_yop[] = { "AY0", "AY1", "AF", "0" };
static const char *const alu_dst[] = { "AR", "AF", "NONE" };

static const char *const mac_xop[] = { "MX0", "MX1", "AR", "MR0", "MR1", "MR2", "SR0", "SR1" };
static const char *const mac_yop[] = { "MY0", "MY1", "MF", "0" };
static const char *const mac_dst[] = { "MR", "MF" };

static const char *const shift_xop[] = { "SI", "??", "AR", "MR0", "MR1", "MR2", "SR0", "SR1" };

static const char *const reg_grp[][16] =
{
	{ "AX0", "AX1", "MX0", "MX1", "AY0", "AY1", "MY0", "MY1", "SI", "SE", "AR", "MR0", "MR1", "MR2", "SR0", "SR1" },
	{ "I0", "I1", "I2", "I3", "M0", "M1", "M2", "M3", "L0", "L1", "L2", "L3", "??", "??", "??", "??" },
	{ "I4", "I5", "I6", "I7", "M4", "M5", "M6", "M7", "L4", "L5", "L6", "L7", "??", "??", "??", "??" },
	{ "ASTAT", "MSTAT", "SSTAT", "IMASK", "ICNTL", "CNTR", "SB", "PX", "RX0", "TX0", "RX1", "TX1", "IFC", "OWRCNTR", "??", "??" }
};
static const char *const dual_xreg[] = { "AX0", "AX1", "MX0", "MX1" };
static const char *const dual_yreg[] = { "AY0", "AY1", "MY0", "MY1" };

static const char *const condition[] =
{
	"IF EQ ",
	"IF NE ",
	"IF GT ",
	"IF LE ",
	"IF LT ",
	"IF GE ",
	"IF AV ",
	"IF NOT AV ",
	"IF AC ",
	"IF NOT AC ",
	"IF NEG ",
	"IF POS ",
	"IF MV ",
	"IF NOT MV ",
	"IF NOT CE ",
	""
};

static const char *const do_condition[] =
{
	"NE",
	"EQ",
	"LE",
	"GT",
	"GE",
	"LT",
	"NOT AV",
	"AV",
	"NOT AC",
	"AC",
	"POS",
	"NEG",
	"NOT MV",
	"MV",
	"CE",
	"FOREVER"
};

static const char *const alumac_op[][2] =
{
	{ "",                            "" },
	{ "%s = %s * %s (RND)",          "%s = %s * %s (RND)" },
	{ "%s = MR + %s * %s (RND)",     "%s = MR + %s * %s (RND)" },
	{ "%s = MR - %s * %s (RND)",     "%s = MR - %s * %s (RND)" },
	{ "%s = %s * %s (SS)",           "%s = 0" },
	{ "%s = %s * %s (SU)",           "%s = %s * %s (SU)" },
	{ "%s = %s * %s (US)",           "%s = %s * %s (US)" },
	{ "%s = %s * %s (UU)",           "%s = %s * %s (UU)" },
	{ "%s = MR + %s * %s (SS)",      "%s = MR + %s * %s (SS)" },
	{ "%s = MR + %s * %s (SU)",      "%s = MR + %s * %s (SU)" },
	{ "%s = MR + %s * %s (US)",      "%s = MR + %s * %s (US)" },
	{ "%s = MR + %s * %s (UU)",      "%s = MR + %s * %s (UU)" },
	{ "%s = MR - %s * %s (SS)",      "%s = MR - %s * %s (SS)" },
	{ "%s = MR - %s * %s (SS)",      "%s = MR - %s * %s (SS)" },
	{ "%s = MR - %s * %s (US)",      "%s = MR - %s * %s (US)" },
	{ "%s = MR - %s * %s (UU)",      "%s = MR - %s * %s (UU)" },

	{ "!%s = %s",                    "%s = 0" },
	{ "!%s = %s + 1",                "%s = 1" },
	{ "%s = %s + %s + C",            "%s = %s + %s + C" },
	{ "%s = %s + %s",                "%s = %s" },
	{ "!%s = NOT %s",                "!%s = NOT %s" },
	{ "!%s = -%s",                   "!%s = -%s" },
	{ "%s = %s - %s + C - 1",        "%s = %s + C - 1" },
	{ "%s = %s - %s",                "%s = %s - %s" },
	{ "!%s = %s - 1",                "%s = -1" },
	{ "!%s = %s - %s",               "%s = -%s" },
	{ "!%s = %s - %s + C - 1",       "%s = -%s + C - 1" },
	{ "%s = NOT %s",                 "%s = NOT %s" },
	{ "%s = %s AND %s",              "%s = %s AND %s" },
	{ "%s = %s OR %s",               "%s = %s OR %s" },
	{ "%s = %s XOR %s",              "%s = %s XOR %s" },
	{ "%s = ABS %s",                 "%s = ABS %s" }
};

static const char *const shift_op[] =
{
	"SR = LSHIFT %s (HI)",
	"SR = SR OR LSHIFT %s (HI)",
	"SR = LSHIFT %s (LO)",
	"SR = SR OR LSHIFT %s (LO)",
	"SR = ASHIFT %s (HI)",
	"SR = SR OR ASHIFT %s (HI)",
	"SR = ASHIFT %s (LO)",
	"SR = SR OR ASHIFT %s (LO)",
	"SR = NORM %s (HI)",
	"SR = SR OR NORM %s (HI)",
	"SR = NORM %s (LO)",
	"SR = SR OR NORM %s (LO)",
	"SE = EXP %s (HI)",
	"SE = EXP %s (HIX)",
	"SE = EXP %s (LO)",
	"SB = EXPADJ %s",
};

static const char *const shift_by_op[] =
{
	"SR = LSHIFT %s BY %d (HI)",
	"SR = SR OR LSHIFT %s BY %d (HI)",
	"SR = LSHIFT %s BY %d (LO)",
	"SR = SR OR LSHIFT %s BY %d (LO)",
	"SR = ASHIFT %s BY %d (HI)",
	"SR = SR OR ASHIFT %s BY %d (HI)",
	"SR = ASHIFT %s BY %d (LO)",
	"SR = SR OR ASHIFT %s BY %d (LO)",
	"???",
	"???",
	"???",
	"???",
	"???",
	"???",
	"???",
	"???"
};

static const char *const constants[] =
{
	"$0001",
	"$FFFE",
	"$0002",
	"$FFFD",
	"$0004",
	"$FFFB",
	"$0008",
	"$FFF7",
	"$0010",
	"$FFEF",
	"$0020",
	"$FFDF",
	"$0040",
	"$FFBF",
	"$0080",
	"$FF7F",
	"$0100",
	"$FEFF",
	"$0200",
	"$FDFF",
	"$0400",
	"$FBFF",
	"$0800",
	"$F7FF",
	"$1000",
	"$EFFF",
	"$2000",
	"$DFFF",
	"$4000",
	"$BFFF",
	"$8000",
	"$7FFF"
};




static int alumac(char *buffer, int dest, int op)
{
	int opindex = (op >> 13) & 31;
	const char *xop, *yop, *dst, *opstring;

	if (opindex & 16)
	{
		xop = alu_xop[(op >> 8) & 7];
		yop = alu_yop[(op >> 11) & 3];
		dst = alu_dst[dest];
	}
	else
	{
		xop = mac_xop[(op >> 8) & 7];
		yop = mac_yop[(op >> 11) & 3];
		dst = mac_dst[dest];
	}
	opstring = alumac_op[opindex][((op >> 11) & 3) == 3];
	if (opstring[0] == '!')
		return sprintf(buffer, opstring + 1, dst, yop, xop);
	else
		return sprintf(buffer, opstring, dst, xop, yop);
}


static int aluconst(char *buffer, int dest, int op)
{
	int opindex = (op >> 13) & 31;
	const char *xop, *dst, *cval, *opstring;

	if (opindex & 16)
	{
		xop = alu_xop[(op >> 8) & 7];
		cval = constants[((op >> 5) & 0x07) | ((op >> 8) & 0x18)];
		dst = alu_dst[dest];
	}
	else
	{
		xop = mac_xop[(op >> 8) & 7];
		cval = xop;
		dst = mac_dst[dest];
	}
	opstring = alumac_op[opindex][((op >> 11) & 3) == 3];
	if (opstring[0] == '!')
		return sprintf(buffer, opstring + 1, dst, cval, xop);
	else
		return sprintf(buffer, opstring, dst, xop, cval);
}


/* execute instructions on this CPU until icount expires */
//CPU_DISASSEMBLE( adsp21xx )
int adsp21xx_dasm(char *buffer, UINT8 *oprom)
{
	unsigned int op = oprom[0] | (oprom[1] << 8) | (oprom[2] << 16);
	unsigned dasmflags = 0;
	int temp;

	switch ((op >> 16) & 0xff)
	{
		case 0x00:
			/* 00000000 00000000 00000000  NOP */
			sprintf(buffer, "%s", "NOP");
			break;
		case 0x01:
			/* 00000000 0xxxxxxx xxxxxxxx  dst = IO(x) */
			/* 00000000 1xxxxxxx xxxxxxxx  IO(x) = dst */
			/* ADSP-218x only */
			if ((op & 0x008000) == 0x000000)
				buffer += sprintf(buffer, "%s = IO($%X)", reg_grp[0][op & 15], (op >> 4) & 0x7ff);
			else
				buffer += sprintf(buffer, "IO($%X) = %s", (op >> 4) & 0x7ff, reg_grp[0][op & 15]);
			break;
		case 0x02:
			/* 00000010 0000xxxx xxxxxxxx  modify flag out */
			if ((op & 0x00f000) == 0x000000)
			{
				buffer += sprintf(buffer, "%s", condition[op & 15]);
				buffer += sprintf(buffer, flag_change[(op >> 4) & 3], "FLAG_OUT");
				buffer += sprintf(buffer, flag_change[(op >> 6) & 3], "FL0");
				buffer += sprintf(buffer, flag_change[(op >> 8) & 3], "FL1");
				buffer += sprintf(buffer, flag_change[(op >> 10) & 3], "FL2");
			}
			/* 00000010 10000000 00000000  idle */
			/* 00000010 10000000 0000xxxx  idle (n) */
			else if ((op & 0x00fff0) == 0x008000)
			{
			}
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x03:
			/* 00000011 xxxxxxxx xxxxxxxx  call or jump on flag in */
			if (op & 2)
				buffer += sprintf(buffer, "%s", "IF FLAG_IN ");
			else
				buffer += sprintf(buffer, "%s", "IF NOT FLAG_IN ");
			if (op & 1)
			{
				buffer += sprintf(buffer, "%s", "CALL ");
				dasmflags = DASMFLAG_STEP_OVER;
			}
			else
				buffer += sprintf(buffer, "%s", "JUMP ");
			temp = ((op >> 4) & 0x0fff) | ((op << 10) & 0x3000);
			buffer += sprintf(buffer, "$%04X", temp);
			break;
		case 0x04:
			/* 00000100 00000000 000xxxxx  stack control */
			if ((op & 0x00ffe0) == 0x000000)
			{
				if (op & 0x000010)
				{
					buffer += sprintf(buffer, "%s", "POP PC ");
					dasmflags = DASMFLAG_STEP_OUT;
				}
				if (op & 0x000008) buffer += sprintf(buffer, "%s", "POP LOOP ");
				if (op & 0x000004) buffer += sprintf(buffer, "%s", "POP CNTR ");
				if ((op & 0x000003) == 0x000002) buffer += sprintf(buffer, "%s", "PUSH STAT ");
				else if ((op & 0x000003) == 0x000003) buffer += sprintf(buffer, "%s", "POP STAT ");
			}
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x05:
			/* 00000101 00000000 00000000  saturate MR */
			if ((op & 0x00ffff) == 0x000000)
				buffer += sprintf(buffer, "%s", "IF MV SAT MR");
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x06:
			/* 00000110 000xxxxx 00000000  DIVS */
			if ((op & 0x00e0ff) == 0x000000)
				buffer += sprintf(buffer, "DIVS %s,%s", alu_yop[(op >> 11) & 3], alu_xop[(op >> 8) & 7]);
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x07:
			/* 00000111 00010xxx 00000000  DIVQ */
			if ((op & 0x00f8ff) == 0x001000)
				buffer += sprintf(buffer, "DIVQ %s", alu_xop[(op >> 8) & 7]);
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x08:
			/* 00001000 00000000 0000xxxx  reserved */
			buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x09:
			/* 00001001 00000000 000xxxxx  modify address register */
			if ((op & 0x00ffe0) == 0x000000)
			{
				temp = (op >> 2) & 4;
				buffer += sprintf(buffer, "MODIFY (I%d,M%d)", temp + ((op >> 2) & 3), temp + (op & 3));
			}
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x0a:
			/* 00001010 00000000 0000xxxx  conditional return */
			if ((op & 0x00ffe0) == 0x000000)
			{
				buffer += sprintf(buffer, "%s", condition[op & 15]);
				if (op & 0x000010)
					buffer += sprintf(buffer, "%s", "RTI");
				else
					buffer += sprintf(buffer, "%s", "RTS");
				dasmflags = DASMFLAG_STEP_OUT;
			}
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x0b:
			/* 00001011 00000000 xx00xxxx  conditional jump (indirect address) */
			if ((op & 0x00ff00) == 0x000000)
			{
				buffer += sprintf(buffer, "%s", condition[op & 15]);
				if (op & 0x000010)
				{
					buffer += sprintf(buffer, "CALL (I%d)", 4 + ((op >> 6) & 3));
					dasmflags = DASMFLAG_STEP_OVER;
				}
				else
					buffer += sprintf(buffer, "JUMP (I%d)", 4 + ((op >> 6) & 3));
			}
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x0c:
			/* 00001100 xxxxxxxx xxxxxxxx  mode control */
			buffer += sprintf(buffer, mode_change[(op >> 4) & 3], "SEC_REG");
			buffer += sprintf(buffer, mode_change[(op >> 6) & 3], "BIT_REV");
			buffer += sprintf(buffer, mode_change[(op >> 8) & 3], "AV_LATCH");
			buffer += sprintf(buffer, mode_change[(op >> 10) & 3], "AR_SAT");
			buffer += sprintf(buffer, mode_change[(op >> 12) & 3], "M_MODE");
			buffer += sprintf(buffer, mode_change[(op >> 14) & 3], "TIMER");
			buffer += sprintf(buffer, mode_change[(op >> 2) & 3], "G_MODE");
			break;
		case 0x0d:
			/* 00001101 0000xxxx xxxxxxxx  internal data move */
			if ((op & 0x00f000) == 0x000000)
				buffer += sprintf(buffer, "%s = %s", reg_grp[(op >> 10) & 3][(op >> 4) & 15], reg_grp[(op >> 8) & 3][op & 15]);
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x0e:
			/* 00001110 0xxxxxxx xxxxxxxx  conditional shift */
			if ((op & 0x0080f0) == 0x000000)
			{
				buffer += sprintf(buffer, "%s", condition[op & 15]);
				buffer += sprintf(buffer, shift_op[(op >> 11) & 15], shift_xop[(op >> 8) & 7]);
			}
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x0f:
			/* 00001111 0xxxxxxx xxxxxxxx  shift immediate */
			if ((op & 0x008000) == 0x000000)
				buffer += sprintf(buffer, shift_by_op[(op >> 11) & 15], shift_xop[(op >> 8) & 7], (signed char)op);
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x10:
			/* 00010000 0xxxxxxx xxxxxxxx  shift with internal data register move */
			if ((op & 0x008000) == 0x000000)
			{
				buffer += sprintf(buffer, shift_op[(op >> 11) & 15], shift_xop[(op >> 8) & 7]);
				buffer += sprintf(buffer, ", %s = %s", reg_grp[0][(op >> 4) & 15], reg_grp[0][op & 15]);
			}
			else
				buffer += sprintf(buffer, "??? (%06X)", op);
			break;
		case 0x11:
			/* 00010001 0xxxxxxx xxxxxxxx  shift with pgm memory read/write */
			buffer += sprintf(buffer, shift_op[(op >> 11) & 15], shift_xop[(op >> 8) & 7]);
			if (op & 0x008000)
				buffer += sprintf(buffer, ", PM(I%d,M%d) = %s", 4 + ((op >> 2) & 3), 4 + (op & 3), reg_grp[0][(op >> 4) & 15]);
			else
				buffer += sprintf(buffer, ", %s = PM(I%d,M%d)", reg_grp[0][(op >> 4) & 15], 4 + ((op >> 2) & 3), 4 + (op & 3));
			break;
		case 0x12: case 0x13:
			/* 0001001x 0xxxxxxx xxxxxxxx  shift with data memory read/write */
			buffer += sprintf(buffer, shift_op[(op >> 11) & 15], shift_xop[(op >> 8) & 7]);
			temp = (op >> 14) & 4;
			if (op & 0x008000)
				buffer += sprintf(buffer, ", DM(I%d,M%d) = %s", temp + ((op >> 2) & 3), temp + (op & 3), reg_grp[0][(op >> 4) & 15]);
			else
				buffer += sprintf(buffer, ", %s = DM(I%d,M%d)", reg_grp[0][(op >> 4) & 15], temp + ((op >> 2) & 3), temp + (op & 3));
			break;
		case 0x14: case 0x15: case 0x16: case 0x17:
			/* 000101xx xxxxxxxx xxxxxxxx  do until */
			buffer += sprintf(buffer, "DO $%04X UNTIL %s", (op >> 4) & 0x3fff, do_condition[op & 15]);
			break;
		case 0x18: case 0x19: case 0x1a: case 0x1b: case 0x1c: case 0x1d: case 0x1e: case 0x1f:
			/* 00011xxx xxxxxxxx xxxxxxxx  conditional jump (immediate addr) */
			if (op & 0x040000)
			{
				buffer += sprintf(buffer, "%sCALL $%04X", condition[op & 15], (op >> 4) & 0x3fff);
				dasmflags = DASMFLAG_STEP_OVER;
			}
			else
				buffer += sprintf(buffer, "%sJUMP $%04X", condition[op & 15], (op >> 4) & 0x3fff);
			break;
		case 0x20: case 0x21: case 0x22: case 0x23: case 0x24: case 0x25: case 0x26: case 0x27:
			/* 00100xxx xxxxxxxx xxxxxxxx  conditional ALU/MAC */
			buffer += sprintf(buffer, "%s", condition[op & 15]);
			if (!(op & 0x10))
				buffer += alumac(buffer, (op >> 18) & 1, op);
			else
			{
				/* ADSP-218x only */
				buffer += aluconst(buffer, (op >> 18) & 1, op);
			}
			break;
		case 0x28: case 0x29: case 0x2a: case 0x2b: case 0x2c: case 0x2d: case 0x2e: case 0x2f:
			/* 00101xxx xxxxxxxx xxxxxxxx  ALU/MAC with internal data register move */
			if ((op & 0x0600ff) == 0x0200aa)
			{
				/* ADSP-218x only */
				buffer += alumac(buffer, 2, op);
			}
			else
			{
				if ((op & 0x03e000) != 0)
				{
					buffer += alumac(buffer, (op >> 18) & 1, op);
					buffer += sprintf(buffer, ", ");
				}
				buffer += sprintf(buffer, "%s = %s", reg_grp[0][(op >> 4) & 15], reg_grp[0][op & 15]);
			}
			break;
		case 0x30: case 0x31: case 0x32: case 0x33: case 0x34: case 0x35: case 0x36: case 0x37:
		case 0x38: case 0x39: case 0x3a: case 0x3b: case 0x3c: case 0x3d: case 0x3e: case 0x3f:
			/* 0011xxxx xxxxxxxx xxxxxxxx  load non-data register immediate */
			buffer += sprintf(buffer, "%s = $%04X", reg_grp[(op >> 18) & 3][op & 15], (op >> 4) & 0x3fff);
			break;
		case 0x40: case 0x41: case 0x42: case 0x43: case 0x44: case 0x45: case 0x46: case 0x47:
		case 0x48: case 0x49: case 0x4a: case 0x4b: case 0x4c: case 0x4d: case 0x4e: case 0x4f:
			/* 0100xxxx xxxxxxxx xxxxxxxx  load data register immediate */
			buffer += sprintf(buffer, "%s = $%04X", reg_grp[0][op & 15], (op >> 4) & 0xffff);
			break;
		case 0x50: case 0x51: case 0x52: case 0x53: case 0x54: case 0x55: case 0x56: case 0x57:
		case 0x58: case 0x59: case 0x5a: case 0x5b: case 0x5c: case 0x5d: case 0x5e: case 0x5f:
			/* 0101xxxx xxxxxxxx xxxxxxxx  ALU/MAC with pgm memory read/write */
			if ((op & 0x03e000) != 0)
			{
				buffer += alumac(buffer, (op >> 18) & 1, op);
				buffer += sprintf(buffer, ", ");
			}
			if (op & 0x080000)
				buffer += sprintf(buffer, "PM(I%d,M%d) = %s", 4 + ((op >> 2) & 3), 4 + (op & 3), reg_grp[0][(op >> 4) & 15]);
			else
				buffer += sprintf(buffer, "%s = PM(I%d,M%d)", reg_grp[0][(op >> 4) & 15], 4 + ((op >> 2) & 3), 4 + (op & 3));
			break;
		case 0x60: case 0x61: case 0x62: case 0x63: case 0x64: case 0x65: case 0x66: case 0x67:
		case 0x68: case 0x69: case 0x6a: case 0x6b: case 0x6c: case 0x6d: case 0x6e: case 0x6f:
		case 0x70: case 0x71: case 0x72: case 0x73: case 0x74: case 0x75: case 0x76: case 0x77:
		case 0x78: case 0x79: case 0x7a: case 0x7b: case 0x7c: case 0x7d: case 0x7e: case 0x7f:
			/* 011xxxxx xxxxxxxx xxxxxxxx  ALU/MAC with data memory read/write */
			if ((op & 0x03e000) != 0)
			{
				buffer += alumac(buffer, (op >> 18) & 1, op);
				buffer += sprintf(buffer, ", ");
			}
			temp = (op >> 18) & 4;
			if (op & 0x080000)
				buffer += sprintf(buffer, "DM(I%d,M%d) = %s", temp + ((op >> 2) & 3), temp + (op & 3), reg_grp[0][(op >> 4) & 15]);
			else
				buffer += sprintf(buffer, "%s = DM(I%d,M%d)", reg_grp[0][(op >> 4) & 15], temp + ((op >> 2) & 3), temp + (op & 3));
			break;
		case 0x80: case 0x81: case 0x82: case 0x83: case 0x84: case 0x85: case 0x86: case 0x87:
		case 0x88: case 0x89: case 0x8a: case 0x8b: case 0x8c: case 0x8d: case 0x8e: case 0x8f:
		case 0x90: case 0x91: case 0x92: case 0x93: case 0x94: case 0x95: case 0x96: case 0x97:
		case 0x98: case 0x99: case 0x9a: case 0x9b: case 0x9c: case 0x9d: case 0x9e: case 0x9f:
			/* 100xxxxx xxxxxxxx xxxxxxxx  read/write data memory (immediate addr) */
			if (op & 0x100000)
				buffer += sprintf(buffer, "DM($%04X) = %s", (op >> 4) & 0x3fff, reg_grp[(op >> 18) & 3][op & 15]);
			else
				buffer += sprintf(buffer, "%s = DM($%04X)", reg_grp[(op >> 18) & 3][op & 15], (op >> 4) & 0x3fff);
			break;
		case 0xa0: case 0xa1: case 0xa2: case 0xa3: case 0xa4: case 0xa5: case 0xa6: case 0xa7:
		case 0xa8: case 0xa9: case 0xaa: case 0xab: case 0xac: case 0xad: case 0xae: case 0xaf:
		case 0xb0: case 0xb1: case 0xb2: case 0xb3: case 0xb4: case 0xb5: case 0xb6: case 0xb7:
		case 0xb8: case 0xb9: case 0xba: case 0xbb: case 0xbc: case 0xbd: case 0xbe: case 0xbf:
			/* 101xxxxx xxxxxxxx xxxxxxxx  data memory write (immediate) */
			temp = (op >> 18) & 4;
			buffer += sprintf(buffer, "DM(I%d,M%d) = $%04X", temp + ((op >> 2) & 3), temp + (op & 3), (op >> 4) & 0xffff);
			break;
		case 0xc0: case 0xc1: case 0xc2: case 0xc3: case 0xc4: case 0xc5: case 0xc6: case 0xc7:
		case 0xc8: case 0xc9: case 0xca: case 0xcb: case 0xcc: case 0xcd: case 0xce: case 0xcf:
		case 0xd0: case 0xd1: case 0xd2: case 0xd3: case 0xd4: case 0xd5: case 0xd6: case 0xd7:
		case 0xd8: case 0xd9: case 0xda: case 0xdb: case 0xdc: case 0xdd: case 0xde: case 0xdf:
		case 0xe0: case 0xe1: case 0xe2: case 0xe3: case 0xe4: case 0xe5: case 0xe6: case 0xe7:
		case 0xe8: case 0xe9: case 0xea: case 0xeb: case 0xec: case 0xed: case 0xee: case 0xef:
		case 0xf0: case 0xf1: case 0xf2: case 0xf3: case 0xf4: case 0xf5: case 0xf6: case 0xf7:
		case 0xf8: case 0xf9: case 0xfa: case 0xfb: case 0xfc: case 0xfd: case 0xfe: case 0xff:
			/* 11xxxxxx xxxxxxxx xxxxxxxx  ALU/MAC with data & pgm memory read */
			if ((op & 0x03e000) != 0)
			{
				buffer += alumac(buffer, 0, op);
				buffer += sprintf(buffer, ", ");
			}
			buffer += sprintf(buffer, "%s = DM(I%d,M%d), %s = PM(I%d,M%d)", dual_xreg[(op >> 18) & 3], (op >> 2) & 3, op & 3,
						dual_yreg[(op >> 20) & 3], 4 + ((op >> 6) & 3), 4 + ((op >> 4) & 3));
			break;
    }

    return 1 | dasmflags | DASMFLAG_SUPPORTED;
}
