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r7335 Friday 12th February, 2010 at 13:52:15 UTC by Curt Coder
[TRS80M2] WIP

[src/mess/drivers]	trs80m2.c
[src/mess/includes]	trs80m2.h

src/mess/includes/trs80m2.h

r7334	r7335
25	25	/* keyboard state */
26	26	UINT8 key_latch;
27	27	UINT8 key_data;
	28	int key_bit;
	29	int kbclk;
	30	int kbdata;
28	31	int kbirq;
29	32
30	33	/* video state */

src/mess/drivers/trs80m2.c

r7334	r7335
1	1	/*
	2
	3	Tandy Radio Shack TRS-80 Model II/12/16/16B/6000
2	4
	5	http://home.iae.nl/users/pb0aia/cm/modelii.html
	6
	7	*/
	8
	9	/*
	10
3	11	TODO:
4	12
5	13	- BOOT ERROR DM 23 (dma controller)
6		- 40/80 char
7		- KBIRQ -> CTC TRG3
8		- main RAM banking
9	14	- Z80 daisy chain
10		- RTC
11		- floppy DRQ
12	15	- keyboard CPU ROM
13	16	- keyboard layout
	17	- main RAM banking
	18	- graphics board
14	19
15	20	*/
16	21
r7334	r7335
36	41	{
37	42	switch (offset)
38	43	{
39		case 0:
40		return z80sio_d_r(device, 0);
41		case 1:
42		return z80sio_c_r(device, 0);
43		case 2:
44		return z80sio_d_r(device, 1);
45		case 3:
46		return z80sio_c_r(device, 1);
	44	case 0:   return z80sio_d_r(device, 1);
	45	case 1:   return z80sio_d_r(device, 0);
	46	case 2:   return z80sio_c_r(device, 1);
	47	case 3:   return z80sio_c_r(device, 0);
47	48	}
48	49
49	50	return 0;
r7334	r7335
53	54	{
54	55	switch (offset)
55	56	{
56		case 0:
57		z80sio_d_w(device, 0, data);
58		break;
59		case 1:
60		z80sio_c_w(device, 0, data);
61		break;
62		case 2:
63		z80sio_d_w(device, 1, data);
64		break;
65		case 3:
66		z80sio_c_w(device, 1, data);
67		break;
	57	case 0:   z80sio_d_w(device, 1, data); break;
	58	case 1:   z80sio_d_w(device, 0, data); break;
	59	case 2:   z80sio_c_w(device, 1, data); break;
	60	case 3:   z80sio_c_w(device, 0, data); break;
68	61	}
69	62	}
70	63
r7334	r7335
122	115	if (BIT(data, 0))
123	116	{
124	117	/* enable BOOT ROM */
125		memory_install_rom(program, 0x0000, 0x07ff, 0, 0, rom);
	118	memory_install_rom(program, 0x0000, 0x07ff, 0, 0x800, rom);
126	119	}
127	120	else
128	121	{
129	122	/* enable RAM */
130		memory_install_ram(program, 0x0000, 0x07ff, 0, 0, ram);
	123	memory_install_ram(program, 0x0000, 0x0fff, 0, 0, ram);
131	124	}
132	125	}
133	126
r7334	r7335
136	129	trs80m2_state *state = (trs80m2_state *)space->machine->driver_data;
137	130
138	131	/* clear keyboard interrupt */
139		state->kbirq = 0;
	132	state->kbirq = 1;
	133	z80ctc_trg3_w(state->z80ctc, state->kbirq);
140	134
	135	state->key_bit = 0;
	136
141	137	return state->key_data;
142	138	}
143	139
144	140	static READ8_HANDLER( rtc_r )
145	141	{
146	142	/* clear RTC interrupt */
	143	cputag_set_input_line(space->machine, Z80_TAG, INPUT_LINE_NMI, CLEAR_LINE);
147	144
148	145	return 0;
149	146	}
r7334	r7335
216	213	/* RTC interrupt enable */
217	214	state->enable_rtc_int = BIT(data, 5);
218	215
	216	if ((state->rtc_int == 2) && state->enable_rtc_int)
	217	{
	218	/* trigger RTC interrupt */
	219	cputag_set_input_line(space->machine, Z80_TAG, INPUT_LINE_NMI, ASSERT_LINE);
	220	}
	221
219	222	/* video display enable */
220	223	state->blnkvid = BIT(data, 6);
221	224
r7334	r7335
231	234	}
232	235	}
233	236
	237	static READ8_HANDLER( keyboard_busy_r )
	238	{
	239	trs80m2_state *state = (trs80m2_state *)space->machine->driver_data;
	240
	241	return state->kbirq;
	242	}
	243
234	244	static READ8_HANDLER( keyboard_data_r )
235	245	{
236	246	trs80m2_state *state = (trs80m2_state *)space->machine->driver_data;
r7334	r7335
258	268	*/
259	269
260	270	trs80m2_state *state = (trs80m2_state *)space->machine->driver_data;
	271
	272	int kbdata = BIT(data, 0);
	273	int kbclk = BIT(data, 1);
261	274
262		if (BIT(data, 1))
	275	if (state->key_bit == 8)
263	276	{
264		state->key_data <<= 1;
265		state->key_data |= BIT(data, 0);
	277	if (!state->kbdata && kbdata)
	278	{
	279	/* trigger keyboard interrupt */
	280	state->kbirq = 0;
	281	z80ctc_trg3_w(state->z80ctc, state->kbirq);
	282	}
266	283	}
	284	else
	285	{
	286	if (!state->kbclk && kbclk)
	287	{
	288	/* shift in keyboard data bit */
	289	state->key_data <<= 1;
	290	state->key_data |= kbdata;
	291	state->key_bit++;
	292	}
	293	}
	294
	295	state->kbdata = kbdata;
	296	state->kbclk = kbclk;
267	297	}
268	298
269	299	static WRITE8_HANDLER( keyboard_latch_w )
r7334	r7335
291	321	/* Memory Maps */
292	322
293	323	static ADDRESS_MAP_START( z80_mem, ADDRESS_SPACE_PROGRAM, 8 )
294		AM_RANGE(0x0000, 0x07ff) AM_ROM
295		AM_RANGE(0x0800, 0xf7ff) AM_RAM
	324	AM_RANGE(0x0000, 0xf7ff) AM_RAM
296	325	AM_RANGE(0xf800, 0xffff) AM_RAM AM_BASE_MEMBER(trs80m2_state, video_ram)
297	326	ADDRESS_MAP_END
298	327
r7334	r7335
312	341	ADDRESS_MAP_END
313	342
314	343	static ADDRESS_MAP_START( trs80m2_keyboard_io, ADDRESS_SPACE_IO, 8 )
	344	AM_RANGE(MCS48_PORT_T1, MCS48_PORT_T1) AM_READ(keyboard_busy_r)
315	345	AM_RANGE(MCS48_PORT_P0, MCS48_PORT_P0) AM_READ(keyboard_data_r)
316	346	AM_RANGE(MCS48_PORT_P1, MCS48_PORT_P1) AM_WRITE(keyboard_ctrl_w)
317	347	AM_RANGE(MCS48_PORT_P2, MCS48_PORT_P2) AM_WRITE(keyboard_latch_w)
r7334	r7335
482	512
483	513	static WRITE_LINE_DEVICE_HANDLER( vsync_w )
484	514	{
	515	trs80m2_state *driver_state = (trs80m2_state *)device->machine->driver_data;
	516
	517	if (state) driver_state->rtc_int++;
	518
	519	if (driver_state->rtc_int == 2)
	520	{
	521	driver_state->rtc_int = 0;
	522
	523	if (driver_state->enable_rtc_int)
	524	{
	525	/* trigger RTC interrupt */
	526	cputag_set_input_line(device->machine, Z80_TAG, INPUT_LINE_NMI, ASSERT_LINE);
	527	}
	528	}
485	529	}
486	530
487	531	static const mc6845_interface mc6845_intf =
r7334	r7335
564	608	/* floppy interrupt */
565	609	data |= state->fdc_intrq;
566	610
	611	/* 2-sided diskette */
	612	data |= 0x02;
	613
567	614	/* disk change */
568	615	data |= floppy_dskchg_r(state->floppy) << 2;
569	616
r7334	r7335
681	728	driver_state->fdc_intrq = state;
682	729	}
683	730
684		static WRITE_LINE_DEVICE_HANDLER( fdc_drq_w )
685		{
686		}
687
688	731	static const wd17xx_interface fd1791_intf =
689	732	{
690	733	DEVCB_NULL,
691	734	DEVCB_LINE(fdc_intrq_w),
692		DEVCB_LINE(fdc_drq_w),
	735	DEVCB_DEVICE_LINE(Z80DMA_TAG, z80dma_rdy_w),
693	736	{ FLOPPY_0, NULL, NULL, NULL }
694	737	};
695	738
r7334	r7335
712	755	state->mc6845 = devtag_get_device(machine, MC6845_TAG);
713	756	state->centronics = devtag_get_device(machine, CENTRONICS_TAG);
714	757
715		/* setup memory banking */
716
717	758	/* register for state saving */
718	759	state_save_register_global(machine, state->key_latch);
719	760	state_save_register_global(machine, state->key_data);
720	761	}
721	762
	763	static MACHINE_RESET( trs80m2 )
	764	{
	765	const address_space *program = cputag_get_address_space(machine, Z80_TAG, ADDRESS_SPACE_PROGRAM);
	766
	767	/* enable boot ROM */
	768	rom_enable_w(program, 0, 1);
	769	}
	770
722	771	/* Machine Driver */
723	772
724	773	static MACHINE_DRIVER_START( trs80m2 )
r7334	r7335
733	782	//   MDRV_CPU_IO_MAP(trs80m2_keyboard_io)
734	783
735	784	MDRV_MACHINE_START(trs80m2)
	785	MDRV_MACHINE_RESET(trs80m2)
736	786
737	787	/* video hardware */
738	788	MDRV_SCREEN_ADD(SCREEN_TAG, RASTER)
r7334	r7335
768	818	static MACHINE_DRIVER_START( trs80m16 )
769	819	MDRV_IMPORT_FROM(trs80m2)
770	820
	821	/* basic machine hardware */
771	822	MDRV_CPU_ADD(M68000_TAG, M68000, 6000000)
772	823	MDRV_CPU_PROGRAM_MAP(m68000_mem)
	824
	825	/* video hardware */
	826	MDRV_PALETTE_INIT(monochrome_green)
	827
	828	/* internal RAM */
	829	MDRV_RAM_MODIFY("messram")
	830	MDRV_RAM_DEFAULT_SIZE("256K")
	831	MDRV_RAM_EXTRA_OPTIONS("512K,768K,1M")
773	832	MACHINE_DRIVER_END
774	833
775	834	/* ROMs */
776	835
777		ROM_START(trs80m2)
	836	ROM_START( trs80m2 )
778	837	ROM_REGION( 0x800, Z80_TAG, 0 )
779	838	ROM_LOAD( "8043216.u11", 0x0000, 0x0800, CRC(7017a373) SHA1(1c7127fcc99fc351a40d3a3199ba478e783c452e) )
780	839

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