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SNES: fixed a bug with open bus behaviour

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This commit is contained in:
Angelo Salese 2009-08-09 19:43:29 +00:00
parent 6c95409c1f
commit abd75e1b58
1 changed files with 3 additions and 2 deletions
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5
src/mame/machine/snes.c
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@ -80,7 +80,7 @@ static void snes_latch_counters(running_machine *machine)
static TIMER_CALLBACK( snes_nmi_tick )
{
// pull NMI
cputag_set_input_line(machine, "maincpu", G65816_LINE_NMI, HOLD_LINE );
cputag_set_input_line(machine, "maincpu", G65816_LINE_NMI, ASSERT_LINE );
// don't happen again
timer_adjust_oneshot(snes_nmi_timer, attotime_never, 0);
@ -289,7 +289,7 @@ static READ8_HANDLER( snes_open_bus_r )
return 0xff;
recurse = 1;
result = memory_read_byte_8le(space, cpu_get_pc(space->cpu)+2); //TODO: must be the LAST opcode that's fetched on the bus
result = memory_read_byte_8le(space, cpu_get_pc(space->cpu)-1); //LAST opcode that's fetched on the bus
recurse = 0;
return result;
}
@ -597,6 +597,7 @@ READ8_HANDLER( snes_r_io )
}
/* Unsupported reads returns open bus */
// printf("%02x %02x\n",offset,snes_open_bus_r(space,0));
return snes_open_bus_r(space,0);
}