Example #1
0
static READ8_HANDLER( audio_io_r )
{
	badlands_state *state = space->machine->driver_data<badlands_state>();
	int result = 0xff;

	switch (offset & 0x206)
	{
		case 0x000:		/* n/c */
			logerror("audio_io_r: Unknown read at %04X\n", offset & 0x206);
			break;

		case 0x002:		/* /RDP */
			result = atarigen_6502_sound_r(space, offset);
			break;

		case 0x004:		/* /RDIO */
			/*
                0x80 = self test
                0x40 = NMI line state (active low)
                0x20 = sound output full
                0x10 = self test
                0x08 = +5V
                0x04 = +5V
                0x02 = coin 2
                0x01 = coin 1
            */
			result = input_port_read(space->machine, "AUDIO");
			if (!(input_port_read(space->machine, "FE4000") & 0x0080)) result ^= 0x90;
			if (state->cpu_to_sound_ready) result ^= 0x40;
			if (state->sound_to_cpu_ready) result ^= 0x20;
			result ^= 0x10;
			break;

		case 0x006:		/* /IRQACK */
			atarigen_6502_irq_ack_r(space, 0);
			break;

		case 0x200:		/* /VOICE */
		case 0x202:		/* /WRP */
		case 0x204:		/* /WRIO */
		case 0x206:		/* /MIX */
			logerror("audio_io_r: Unknown read at %04X\n", offset & 0x206);
			break;
	}

	return result;
}
Example #2
0
static READ_HANDLER( audio_io_r )
{
	int result = 0xff;

	switch (offset & 0x206)
	{
		case 0x000:		/* n/c */
			//logerror("audio_io_r: Unknown read at %04X\n", offset & 0x206);
			break;

		case 0x002:		/* /RDP */
			result = atarigen_6502_sound_r(offset);
			break;

		case 0x004:		/* /RDIO */
			/*
				0x80 = self test
				0x40 = NMI line state (active low)
				0x20 = sound output full
				0x10 = self test
				0x08 = +5V
				0x04 = +5V
				0x02 = coin 2
				0x01 = coin 1
			*/
			result = readinputport(3);
			if (!(readinputport(0) & 0x0080)) result ^= 0x90;
			if (atarigen_cpu_to_sound_ready) result ^= 0x40;
			if (atarigen_sound_to_cpu_ready) result ^= 0x20;
			result ^= 0x10;
			break;

		case 0x006:		/* /IRQACK */
			atarigen_6502_irq_ack_r(0);
			break;

		case 0x200:		/* /VOICE */
		case 0x202:		/* /WRP */
		case 0x204:		/* /WRIO */
		case 0x206:		/* /MIX */
			//logerror("audio_io_r: Unknown read at %04X\n", offset & 0x206);
			break;
	}

	return result;
}