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.prevented TMSS register access when TMSS/BIOS is disabled (fixes some unlicensed game developed with Tomsoft Studio SEGA Kit)

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.added random starting cycle value for 68k/Z80
This commit is contained in:
ekeeke31 2010-08-26 22:31:52 +00:00
parent c2d54eb63a
commit fd53f3f568
2 changed files with 10 additions and 5 deletions
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6
source/genesis.c
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@ -138,8 +138,8 @@ void gen_hardreset(void)
m68k_memory_map[0].base = bios_rom;
}
/* Reset CPU cycles */
mcycles_68k = mcycles_z80 = 0;
/* 68k & Z80 could restart anywhere in VDP frame (Bonkers, Eternal Champions, X-Men 2) */
mcycles_68k = mcycles_z80 = (uint32)((MCYCLES_PER_LINE * lines_per_frame) * ((double)rand() / (double)RAND_MAX));
/* Z80 bus is released & Z80 is stopped */
m68k_memory_map[0xa0].read8 = m68k_read_bus_8;
@ -172,7 +172,7 @@ void gen_softreset(int state)
if (config.lock_on == TYPE_AR)
datel_reset(0);
/* 68k & Z80 could restart anywhere in VDP frame (fixes Eternal Champions, X-Men 2) */
/* 68k & Z80 could restart anywhere in VDP frame (Bonkers, Eternal Champions, X-Men 2) */
mcycles_68k = mcycles_z80 = (uint32)((MCYCLES_PER_LINE * lines_per_frame) * ((double)rand() / (double)RAND_MAX));
/* Reset 68k, Z80 & YM2612 */

9
source/mem68k.c
View File

@ -483,8 +483,13 @@ void ctrl_io_write_word(unsigned int address, unsigned int data)
case 0x40: /* TMSS */
{
gen_tmss_w(address & 3, data);
break;
if (config.tmss & 1)
{
gen_tmss_w(address & 3, data);
return;
}
m68k_unused_16_w(address, data);
return;
}
case 0x50: /* SVP REGISTERS */