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r21600 Tuesday 5th March, 2013 at 17:45:11 UTC by Fabio Priuli
minor cleanup. nw.

[src/mess/machine]

snesobc1.c

trunk/src/mess/machine/snesobc1.c

r21599	r21600
17	17	int address;
18	18	int offset;
19	19	int shift;
	20	UINT8 ram[0x2000];
20	21	};
21	22
22	23	static snes_obc1_state obc1_state;
r21599	r21600
30	31	switch (address)
31	32	{
32	33	case 0x1ff0:
33		value = snes_ram[obc1_state.offset + (obc1_state.address << 2) + 0];
	34	value = obc1_state.ram[obc1_state.offset + (obc1_state.address << 2) + 0];
34	35	break;
35	36
36	37	case 0x1ff1:
37		value = snes_ram[obc1_state.offset + (obc1_state.address << 2) + 1];
	38	value = obc1_state.ram[obc1_state.offset + (obc1_state.address << 2) + 1];
38	39	break;
39	40
40	41	case 0x1ff2:
41		value = snes_ram[obc1_state.offset + (obc1_state.address << 2) + 2];
	42	value = obc1_state.ram[obc1_state.offset + (obc1_state.address << 2) + 2];
42	43	break;
43	44
44	45	case 0x1ff3:
45		value = snes_ram[obc1_state.offset + (obc1_state.address << 2) + 3];
	46	value = obc1_state.ram[obc1_state.offset + (obc1_state.address << 2) + 3];
46	47	break;
47	48
48	49	case 0x1ff4:
49		value = snes_ram[obc1_state.offset + (obc1_state.address >> 2) + 0x200];
	50	value = obc1_state.ram[obc1_state.offset + (obc1_state.address >> 2) + 0x200];
50	51	break;
51	52
52	53	default:
53		value = snes_ram[address];
	54	value = obc1_state.ram[address];
54	55	break;
55	56	}
56	57
r21599	r21600
66	67	switch(address)
67	68	{
68	69	case 0x1ff0:
69		snes_ram[obc1_state.offset + (obc1_state.address << 2) + 0] = data;
	70	obc1_state.ram[obc1_state.offset + (obc1_state.address << 2) + 0] = data;
70	71	break;
71	72
72	73	case 0x1ff1:
73		snes_ram[obc1_state.offset + (obc1_state.address << 2) + 1] = data;
	74	obc1_state.ram[obc1_state.offset + (obc1_state.address << 2) + 1] = data;
74	75	break;
75	76
76	77	case 0x1ff2:
77		snes_ram[obc1_state.offset + (obc1_state.address << 2) + 2] = data;
	78	obc1_state.ram[obc1_state.offset + (obc1_state.address << 2) + 2] = data;
78	79	break;
79	80
80	81	case 0x1ff3:
81		snes_ram[obc1_state.offset + (obc1_state.address << 2) + 3] = data;
	82	obc1_state.ram[obc1_state.offset + (obc1_state.address << 2) + 3] = data;
82	83	break;
83	84
84	85	case 0x1ff4:
85		temp = snes_ram[obc1_state.offset + (obc1_state.address >> 2) + 0x200];
	86	temp = obc1_state.ram[obc1_state.offset + (obc1_state.address >> 2) + 0x200];
86	87	temp = (temp & ~(3 << obc1_state.shift)) | ((data & 0x03) << obc1_state.shift);
87		snes_ram[obc1_state.offset + (obc1_state.address >> 2) + 0x200] = temp;
	88	obc1_state.ram[obc1_state.offset + (obc1_state.address >> 2) + 0x200] = temp;
88	89	break;
89	90
90	91	case 0x1ff5:
91	92	obc1_state.offset = (data & 0x01) ? 0x1800 : 0x1c00;
92		snes_ram[address & 0x1fff] = data;
	93	obc1_state.ram[address & 0x1fff] = data;
93	94	break;
94	95
95	96	case 0x1ff6:
96	97	obc1_state.address = data & 0x7f;
97	98	obc1_state.shift = (data & 0x03) << 1;
98		snes_ram[address & 0x1fff] = data;
	99	obc1_state.ram[address & 0x1fff] = data;
99	100	break;
100	101
101	102	default:
102		snes_ram[address & 0x1fff] = data;
	103	obc1_state.ram[address & 0x1fff] = data;
103	104	break;
104	105	}
105	106	}
106	107
107	108	void obc1_init( running_machine &machine )
108	109	{
109		obc1_state.offset  = (snes_ram[0x1ff5] & 0x01) ? 0x1800 : 0x1c00;
110		obc1_state.address = (snes_ram[0x1ff6] & 0x7f);
111		obc1_state.shift   = (snes_ram[0x1ff6] & 0x03) << 1;
	110	memset(obc1_state.ram, 0x00, sizeof(obc1_state.ram));
	111	obc1_state.offset  = (obc1_state.ram[0x1ff5] & 0x01) ? 0x1800 : 0x1c00;
	112	obc1_state.address = (obc1_state.ram[0x1ff6] & 0x7f);
	113	obc1_state.shift   = (obc1_state.ram[0x1ff6] & 0x03) << 1;
112	114
113	115	state_save_register_global(machine, obc1_state.offset);
114	116	state_save_register_global(machine, obc1_state.address);
115	117	state_save_register_global(machine, obc1_state.shift);
	118	state_save_register_global_array(machine, obc1_state.ram);
116	119	}

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