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r46589 Tuesday 22nd March, 2016 at 11:26:57 UTC by hap
SM511: added undocumented opcodes

[src/devices/cpu/sm510]

sm510.cpp sm510.h sm510op.cpp sm511core.cpp

trunk/src/devices/cpu/sm510/sm510.cpp

r255100	r255101
19	19	- callback for lcd screen as MAME bitmap (when needed)
20	20	- LCD bs pin blink mode via Y register (0.5s off, 0.5s on)
21	21	- LB/SBM is correct?
22		- SM511 unknown opcodes
	22	- SM511 undocumented/guessed opcodes:
	23	* $01 is guessed as DIV to ACC transfer, unknown which bits
	24	* $5d is certainly CEND
	25	* $65 is certainly IDIV, but not sure if it behaves same as on SM510
23	26
24	27	*/
25	28

trunk/src/devices/cpu/sm510/sm510.h

r255100	r255101
260	260	void op_skip();
261	261	void op_cend();
262	262	void op_idiv();
	263	void op_dta();
263	264
264	265	void op_illegal();
265	266	};

trunk/src/devices/cpu/sm510/sm510op.cpp

r255100	r255101
450	450	m_div = 0;
451	451	}
452	452
	453	void sm510_base_device::op_dta()
	454	{
	455	// DTA: transfer divider low bits to ACC
	456	m_acc = BITSWAP16(m_div,0,0,0,0, 0,0,0,0, 0,0,0,0, 7,8,9,10) & 0xf;
	457	}
	458
453	459	void sm510_base_device::op_illegal()
454	460	{
455	461	logerror("%s unknown opcode $%02X at $%04X\n", tag(), m_op, m_prev_pc);

trunk/src/devices/cpu/sm510/sm511core.cpp

r255100	r255101
63	63
64	64	void sm511_device::get_opcode_param()
65	65	{
66		// XXX?, LBL, PRE, TL, TML and prefix opcodes are 2 bytes
67		if (m_op == 0x01 || (m_op >= 0x5f && m_op <= 0x61) || (m_op & 0xf0) == 0x70 || (m_op & 0xfc) == 0x68)
	66	// LBL, PRE, TL, TML and prefix opcodes are 2 bytes
	67	if ((m_op >= 0x5f && m_op <= 0x61) || (m_op & 0xf0) == 0x70 || (m_op & 0xfc) == 0x68)
68	68	{
69	69	m_icount--;
70	70	m_param = m_program->read_byte(m_pc);
r255100	r255101
102	102	switch (m_op)
103	103	{
104	104	case 0x00: op_rot(); break;
105		//      case 0x01: op_xxx(); break; // ?
	105	case 0x01: op_dta(); break; // guessed
106	106	case 0x02: op_sbm(); break;
107	107	case 0x03: op_atpl(); break;
108	108	case 0x08: op_add(); break;
r255100	r255101
119	119	case 0x5a: op_ta0(); break;
120	120	case 0x5b: op_tabl(); break;
121	121	case 0x5c: op_atx(); break;
122		//      case 0x5d: op_cend(); break;
	122	case 0x5d: op_cend(); break;
123	123	case 0x5e: op_tal(); break;
124	124	case 0x5f: op_lbl(); break;
125	125
r255100	r255101
127	127	case 0x62: op_wr(); break;
128	128	case 0x63: op_ws(); break;
129	129	case 0x64: op_incb(); break;
130		//      case 0x65: op_idiv(); break;
	130	case 0x65: op_idiv(); break;
131	131	case 0x66: op_rc(); break;
132	132	case 0x67: op_sc(); break;
133	133	case 0x6c: op_decb(); break;

https://github.com/mamedev/mame/commit/e28ac68d81538b0b382c1acb6f334eb2f97c2016

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