MESS SVN History

r15695 Saturday 28th July, 2012 at 14:35:35 UTC by Miodrag Milanović
-pccga: ec1841 not only mirrors the chargen buffer, but also byte-swaps it [shattered] -mc1502: preliminary floppy support. Still not functional [shattered] -pc: fixes the sound in Arkanoid, which doesn't use the 8253 at all. [shattered]

[src/emu/video]	pc_cga.c
[src/mess/drivers]	pc.c
[src/mess/includes]	pc.h
[src/mess/machine]	pc.c

src/emu/video/pc_cga.c
r15694	r15695
1137	1137	static WRITE8_HANDLER ( char_ram_w )
1138	1138	{
1139	1139	UINT8 *gfx = space->machine().root_device().memregion("gfx1")->base();
	1140	offset ^= BIT(offset, 12);
1140	1141	logerror("write char ram %04x %02x\n",offset,data);
1141	1142	gfx[offset + 0x0000] = data;
1142	1143	gfx[offset + 0x0800] = data;
r15694	r15695
1147	1148	static READ8_HANDLER ( char_ram_r )
1148	1149	{
1149	1150	UINT8 *gfx = space->machine().root_device().memregion("gfx1")->base();
	1151	offset ^= BIT(offset, 12);
1150	1152	return gfx[offset];
1151	1153	}
1152	1154
r15694	r15695
1226	1228	fatalerror("CGA: Bus width %d not supported", buswidth);
1227	1229	break;
1228	1230	}
1229		space_prg->install_legacy_readwrite_handler(0xb8000, 0xb87ff, FUNC(char_ram_r),FUNC(char_ram_w), mask );
1230		space_prg->install_legacy_readwrite_handler(0xb9000, 0xb97ff, FUNC(char_ram_r),FUNC(char_ram_w), mask );
	1231	space_prg->install_legacy_readwrite_handler(0xb8000, 0xb9fff, FUNC(char_ram_r),FUNC(char_ram_w), mask );
1231	1232	} else {
1232	1233	if (cga.videoram_size== 0x4000) {
1233	1234	space_prg->install_readwrite_bank(0xb8000, 0xbbfff, 0, 0x04000, "bank11" );

src/mess/machine/pc.c
r15694	r15695
1247	1247
1248	1248	// SIDE ONE
1249	1249	wd17xx_set_side(device, BIT(data, 1));
	1250
	1251	// bits 2, 3 -- motor on (drive 0, 1)
	1252
	1253	// DRIVE SEL
	1254	wd17xx_set_drive(device, BIT(data, 4));
1250	1255	}
1251	1256
	1257	/*
	1258	* Accesses to this port block (halt the CPU until DRQ, INTRQ or MOTOR ON)
	1259	*/
1252	1260	READ8_DEVICE_HANDLER( mc1502_wd17xx_drq_r )
1253	1261	{
1254	1262	UINT8 data;
	1263	UINT64 newpc;
1255	1264
1256	1265	data = wd17xx_drq_r(device);
	1266	if (!data && !wd17xx_intrq_r(device)) {
	1267	/* fake cpu halt by resetting PC one insn back */
	1268	newpc = cpu_get_reg( device->machine().firstcpu, STATE_GENPC );
	1269	cpu_set_reg( device->machine().firstcpu, STATE_GENPC, newpc - 1 );
	1270	}
1257	1271
1258	1272	return data;
1259	1273	}
1260	1274
	1275	READ8_DEVICE_HANDLER( mc1502_wd17xx_motor_r )
	1276	{
	1277	UINT8 data;
	1278
	1279	/* fake motor being always on */
	1280	data = 1;
	1281
	1282	return data;
	1283	}
	1284
	1285
1261	1286	/**********************************************************
1262	1287	*
1263	1288	* Initialization code
r15694	r15695
1428	1453	st->m_u73_q2 = 0;
1429	1454	st->m_out1 = 0;
1430	1455	st->m_pc_spkrdata = 0;
1431		st->m_pc_input = 0;
	1456	st->m_pc_input = 1;
1432	1457	st->m_dma_channel = 0;
1433	1458	memset(st->m_dma_offset,0,sizeof(st->m_dma_offset));
1434	1459	st->m_ppi_portc_switch_high = 0;
r15694	r15695
1490	1515	st->m_u73_q2 = 0;
1491	1516	st->m_out1 = 0;
1492	1517	st->m_pc_spkrdata = 0;
1493		st->m_pc_input = 0;
	1518	st->m_pc_input = 1;
1494	1519	st->m_dma_channel = 0;
1495	1520	memset(st->m_memboard,0xc,sizeof(st->m_memboard)); // check
1496	1521	memset(st->m_dma_offset,0,sizeof(st->m_dma_offset));

src/mess/includes/pc.h
r15694	r15695
96	96
97	97	READ8_DEVICE_HANDLER( mc1502_wd17xx_drq_r );
98	98	READ8_DEVICE_HANDLER( mc1502_wd17xx_aux_r );
	99	READ8_DEVICE_HANDLER( mc1502_wd17xx_motor_r );
99	100	WRITE8_DEVICE_HANDLER( mc1502_wd17xx_aux_w );
100	101
101	102	DRIVER_INIT( ibm5150 );

src/mess/drivers/pc.c
r15694	r15695
158	158	AM_RANGE(0x0060, 0x0063) AM_DEVREADWRITE("ppi8255", i8255_device, read, write)
159	159	AM_RANGE(0x0068, 0x006B) AM_DEVREADWRITE("ppi8255n2", i8255_device, read, write) // keyboard poll
160	160	AM_RANGE(0x0100, 0x0100) AM_DEVREADWRITE_LEGACY("vg93", mc1502_wd17xx_aux_r, mc1502_wd17xx_aux_w)
161		AM_RANGE(0x0108, 0x0108) AM_DEVREAD_LEGACY("vg93", mc1502_wd17xx_drq_r)
	161	AM_RANGE(0x0108, 0x0108) AM_DEVREAD_LEGACY("vg93", mc1502_wd17xx_drq_r) // blocking read!
	162	AM_RANGE(0x010a, 0x010a) AM_DEVREAD_LEGACY("vg93", mc1502_wd17xx_motor_r)
162	163	AM_RANGE(0x010c, 0x010c) AM_DEVREADWRITE_LEGACY("vg93", wd17xx_status_r, wd17xx_command_w)
163	164	AM_RANGE(0x010d, 0x010d) AM_DEVREADWRITE_LEGACY("vg93", wd17xx_track_r, wd17xx_track_w)
164	165	AM_RANGE(0x010e, 0x010e) AM_DEVREADWRITE_LEGACY("vg93", wd17xx_sector_r, wd17xx_sector_w)

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