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 );
}
}
static READ16_HANDLER( topspeed_input_bypass_r )
{
UINT8 port = TC0220IOC_port_r(0); /* read port number */
int steer = 0;
int analogue_steer = input_port_5_word_r(0,0);
int fake = input_port_6_word_r(0,0);
if (!(fake &0x10)) /* Analogue steer (the real control method) */
{
steer = analogue_steer;
}
else /* Digital steer */
{
if (fake & 0x8) /* pressing down */
steer = 0xff40;
if (fake & 0x2) /* pressing right */
steer = 0x007f;
if (fake & 0x1) /* pressing left */
steer = 0xff80;
/* To allow hiscore input we must let you return to
continuous input type while you press up */
if (fake & 0x4) /* pressing up */
steer = analogue_steer;
}
switch (port)
{
case 0x0c:
return steer &0xff;
case 0x0d:
return steer >> 8;
default:
return TC0220IOC_portreg_r(offset);
}
}