static READ16_HANDLER( syvalion_input_bypass_r )
{
/* Bypass TC0220IOC controller for analog input */
data8_t port = TC0220IOC_port_r(0); /* read port number */
switch( port )
{
case 0x08: /* trackball y coords bottom 8 bits for 2nd player */
return input_port_7_r(0);
case 0x09: /* trackball y coords top 8 bits for 2nd player */
if (input_port_7_r(0) & 0x80) /* y- direction (negative value) */
return 0xff;
else /* y+ direction (positive value) */
return 0x00;
case 0x0a: /* trackball x coords bottom 8 bits for 2nd player */
return input_port_6_r(0);
case 0x0b: /* trackball x coords top 8 bits for 2nd player */
if (input_port_6_r(0) & 0x80) /* x- direction (negative value) */
return 0xff;
else /* x+ direction (positive value) */
return 0x00;
case 0x0c: /* trackball y coords bottom 8 bits for 2nd player */
return input_port_5_r(0);
case 0x0d: /* trackball y coords top 8 bits for 1st player */
if (input_port_5_r(0) & 0x80) /* y- direction (negative value) */
return 0xff;
else /* y+ direction (positive value) */
return 0x00;
case 0x0e: /* trackball x coords bottom 8 bits for 1st player */
return input_port_4_r(0);
case 0x0f: /* trackball x coords top 8 bits for 1st player */
if (input_port_4_r(0) & 0x80) /* x- direction (negative value) */
return 0xff;
else /* x+ direction (positive value) */
return 0x00;
default:
return TC0220IOC_portreg_r( offset );
}
}
int sprint2_steering2(int offset)
{
static int last_val=0;
int this_val;
int delta;
this_val=input_port_6_r(0);
delta=this_val-last_val;
last_val=this_val;
if (delta>128) delta-=256;
else if (delta<-128) delta+=256;
/* Divide by four to make our steering less sensitive */
sprint2_steering_buf2+=(delta/4);
if (sprint2_steering_buf2>0)
{
sprint2_steering_buf2--;
sprint2_steering_val2=0x7F;
}
else if (sprint2_steering_buf2<0)
{
sprint2_steering_buf2++;
sprint2_steering_val2=0x3F;
}
return sprint2_steering_val2;
}
static void darkmist_coin_hack(void)
{
/* coin inputs are handled by (unemulated) custom T5182 cpu, so here's a dirty hack */
if(input_port_6_r(0)&1)
{
if(coin_stat==0)
{
coin_stat=1;
if(darkmist_workram[0]<9)
{
darkmist_workram[0]++;
}
else
{
if(darkmist_workram[1]<9)
{
darkmist_workram[0]=0;
darkmist_workram[1]++;
}
}
}
}
else
{
coin_stat=0;
}
}
void firetruck_vh_screenrefresh( struct osd_bitmap *bitmap, int fullrefresh )
{
draw_background( bitmap );
draw_text( bitmap );
draw_sprites( bitmap );
/* Map horn button onto discrete sound emulation */
discrete_sound_w(0x01,input_port_6_r(0));
}
int spiders_timed_irq(void)
{
/* Update CA1 on PIA1 - copy of PA0 (COIN1?) */
pia_0_ca1_w(0 , input_port_0_r(0)&0x01);
/* Update CA2 on PIA1 - copy of PA0 (PS2) */
pia_0_ca2_w(0 , input_port_0_r(0)&0x02);
/* Update CA1 on PIA1 - copy of PA0 (COIN1?) */
pia_0_cb1_w(0 , input_port_6_r(0));
/* Update CB2 on PIA1 - NOT CONNECTED */
return ignore_interrupt();
}
int zaccaria_prot2_r(int offset)
{
switch (offset)
{
case 0:
return input_port_6_r(0); /* bits 4 and 5 must be 0 in Jack Rabbit */
case 2:
return 0x10; /* Jack Rabbit */
case 4:
return 0x80; /* Money Money */
case 6:
return 0x00; /* Money Money */
default:
return 0;
}
}
