home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
AmigActive 10
/
AACD 10.iso
/
AACD
/
Games
/
MAME
/
src
/
machine
/
jedi.c
< prev
next >
Wrap
C/C++ Source or Header
|
2000-04-04
|
2KB
|
82 lines
/***************************************************************************
machine.c
Functions to emulate general aspects of the machine (RAM, ROM, interrupts,
I/O ports)
***************************************************************************/
#include "driver.h"
static unsigned char jedi_control_num = 0;
unsigned char jedi_soundlatch;
unsigned char jedi_soundacklatch;
unsigned char jedi_com_stat;
WRITE_HANDLER( jedi_rom_banksel_w )
{
unsigned char *RAM = memory_region(REGION_CPU1);
if (data & 0x01) cpu_setbank (1, &RAM[0x10000]);
if (data & 0x02) cpu_setbank (1, &RAM[0x14000]);
if (data & 0x04) cpu_setbank (1, &RAM[0x18000]);
}
WRITE_HANDLER( jedi_sound_reset_w )
{
if (data & 1)
cpu_set_reset_line(1,CLEAR_LINE);
else
cpu_set_reset_line(1,ASSERT_LINE);
}
READ_HANDLER( jedi_control_r ) {
if (jedi_control_num == 0)
return readinputport (2);
else if (jedi_control_num == 2)
return readinputport (3);
return 0;
}
WRITE_HANDLER( jedi_control_w ) {
jedi_control_num = offset;
}
WRITE_HANDLER( jedi_soundlatch_w ) {
jedi_soundlatch = data;
jedi_com_stat |= 0x80;
}
WRITE_HANDLER( jedi_soundacklatch_w ) {
jedi_soundacklatch = data;
jedi_com_stat |= 0x40;
}
READ_HANDLER( jedi_soundlatch_r ) {
jedi_com_stat &= 0x7F;
return jedi_soundlatch;
}
READ_HANDLER( jedi_soundacklatch_r ) {
jedi_com_stat &= 0xBF;
return jedi_soundacklatch;
}
READ_HANDLER( jedi_soundstat_r ) {
return jedi_com_stat;
}
READ_HANDLER( jedi_mainstat_r ) {
unsigned char d;
d = (jedi_com_stat & 0xC0) >> 1;
d = d | (input_port_1_r(0) & 0x80);
d = d | 0x1B;
return d;
}