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;
}
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;
}