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[PPI8255] Fixed mode 2 input mask.

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This commit is contained in:
Curt Coder 2009-06-09 08:11:47 +00:00
parent 035dc12072
commit d21d684862
1 changed files with 23 additions and 9 deletions
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32
src/emu/machine/8255ppi.c
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@ -382,11 +382,22 @@ WRITE8_DEVICE_HANDLER( ppi8255_w )
else
ppi8255->latch[2] &= ~(1<<bit); /* reset bit */
if (bit == 2 && ppi8255->group_b_mode == 1) ppi8255->inte_b = data & 1;
if (bit == 4 && ppi8255->group_a_mode == 1 && ppi8255->port_a_dir) ppi8255->inte_a = data & 1;
if (bit == 6 && ppi8255->group_a_mode == 1 && !ppi8255->port_a_dir) ppi8255->inte_a = data & 1;
if (bit == 4 && ppi8255->group_a_mode == 2) ppi8255->inte_2 = data & 1;
if (bit == 6 && ppi8255->group_a_mode == 2) ppi8255->inte_1 = data & 1;
if (ppi8255->group_b_mode == 1)
{
if (bit == 2) ppi8255->inte_b = data & 1;
}
if (ppi8255->group_a_mode == 1)
{
if (bit == 4 && ppi8255->port_a_dir) ppi8255->inte_a = data & 1;
if (bit == 6 && !ppi8255->port_a_dir) ppi8255->inte_a = data & 1;
}
if (ppi8255->group_a_mode == 2)
{
if (bit == 4) ppi8255->inte_2 = data & 1;
if (bit == 6) ppi8255->inte_1 = data & 1;
}
ppi8255_write_port(device, 2);
}
@ -451,10 +462,13 @@ static void set_mode(const device_config *device, int data, int call_handlers)
ppi8255->group_a_mode = 2;
/* Port A direction */
if (ppi8255->port_a_dir)
ppi8255->in_mask[0] = 0xFF, ppi8255->out_mask[0] = 0x00; /* input */
else
ppi8255->in_mask[0] = 0x00, ppi8255->out_mask[0] = 0xFF; /* output */
if (ppi8255->group_a_mode == 2)
ppi8255->in_mask[0] = 0xFF, ppi8255->out_mask[0] = 0xFF; /* bidirectional */
else
if (ppi8255->port_a_dir)
ppi8255->in_mask[0] = 0xFF, ppi8255->out_mask[0] = 0x00; /* input */
else
ppi8255->in_mask[0] = 0x00, ppi8255->out_mask[0] = 0xFF; /* output */
/* Port B direction */
if (ppi8255->port_b_dir)