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[Z80PIO] Added alternate read/write handlers.

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This commit is contained in:
Curt Coder 2009-06-02 06:49:59 +00:00
parent a6c8c32a9a
commit 9eba6f1517
2 changed files with 16 additions and 0 deletions
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14
src/emu/machine/z80pio.c
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@ -532,6 +532,20 @@ WRITE8_DEVICE_HANDLER(z80pio_w)
z80pio_d_w(device, offset & 1, data);
}
READ8_DEVICE_HANDLER(z80pio_alt_r)
{
int channel = BIT(offset, 1);
return (offset & 1) ? z80pio_c_r(device, channel) : z80pio_d_r(device, channel);
}
WRITE8_DEVICE_HANDLER(z80pio_alt_w)
{
int channel = BIT(offset, 1);
if (offset & 1)
z80pio_c_w(device, channel, data);
else
z80pio_d_w(device, channel, data);
}
static DEVICE_START( z80pio )
{

2
src/emu/machine/z80pio.h
View File

@ -104,6 +104,8 @@ void z80pio_bstb_w(const device_config *device, int state);
***************************************************************************/
READ8_DEVICE_HANDLER(z80pio_r);
WRITE8_DEVICE_HANDLER(z80pio_w);
READ8_DEVICE_HANDLER(z80pio_alt_r);
WRITE8_DEVICE_HANDLER(z80pio_alt_w);
/* ----- device interface ----- */