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Spark Man: Refactored the protection, implemented thrash protection that's used after the title screen

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This commit is contained in:
Angelo Salese 2009-12-23 00:56:16 +00:00
parent 5719b6c623
commit 656c6e1f2e
1 changed files with 39 additions and 6 deletions
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45
src/mame/drivers/suna8.c
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@ -828,11 +828,44 @@ ADDRESS_MAP_END
Spark Man
***************************************************************************/
/* This is protection, there appears to be a tight correlation with the NMI. */
static WRITE8_HANDLER( sparkman_nmi_w )
/*
Thrash protection code snippet:
0B48: 3E 81 ld a,$81
0B4A: 32 BF C3 ld ($C3BF),a
0B4D: 21 10 D0 ld hl,$C808
0B50: 11 11 D0 ld de,$C809
0B53: ED 5F ld a,r ;check this, pretty pointless
0B55: 77 ld (hl),a
0B56: 01 80 00 ld bc,$0080
0B59: ED B0 ldir
0B5B: 3E 18 ld a,$18
0B5D: 32 C4 C3 ld ($C3C4),a
0B60: 21 67 13 ld hl,$0B67
0B63: 22 00 D0 ld ($C800),hl
0B66: C9 ret
*/
static UINT8 suna8_trash_prot, *suna8_wram;
/* This is a command-based protection. */
static WRITE8_HANDLER( sparkman_cmd_prot_w )
{
suna8_nmi_enable = data & 0xff;
//if (data & ~0x01) logerror("CPU #0 - PC %04X: unknown nmi bits: %02X\n",cpu_get_pc(space->cpu),data);
switch(data)
{
case 0xa6: suna8_nmi_enable = 1; break;
case 0x00: suna8_nmi_enable = 0; break;
case 0x18: suna8_trash_prot = 0; break;
case 0x81: suna8_trash_prot = 1; break;
default: logerror("CPU #0 - PC %04X: unknown protection command: %02X\n",cpu_get_pc(space->cpu),data);
}
}
static WRITE8_HANDLER( suna8_wram_w )
{
if(!suna8_trash_prot)
suna8_wram[offset] = data;
}
/*
@ -898,11 +931,11 @@ static ADDRESS_MAP_START( sparkman_map, ADDRESS_SPACE_PROGRAM, 8 )
AM_RANGE(0xc200, 0xc200) AM_WRITE(sparkman_spritebank_w ) // Sprite RAM Bank
AM_RANGE(0xc280, 0xc280) AM_WRITE(sparkman_rombank_w ) // ROM Bank (?mirrored up to c2ff?)
AM_RANGE(0xc300, 0xc300) AM_WRITE(sparkman_flipscreen_w ) // Flip Screen
AM_RANGE(0xc380, 0xc3bf) AM_WRITE(sparkman_nmi_w ) // ? NMI related ?
AM_RANGE(0xc380, 0xc3ff) AM_WRITE(sparkman_cmd_prot_w ) // Protection
AM_RANGE(0xc400, 0xc400) AM_WRITE(sparkman_leds_w ) // Leds + Coin Counter
AM_RANGE(0xc500, 0xc500) AM_WRITE(soundlatch_w ) // To Sound CPU
AM_RANGE(0xc600, 0xc7ff) AM_RAM_WRITE(paletteram_RRRRGGGGBBBBxxxx_be_w) AM_BASE_GENERIC(paletteram ) // Palette (Banked??)
AM_RANGE(0xc800, 0xdfff) AM_RAM // RAM
AM_RANGE(0xc800, 0xdfff) AM_RAM_WRITE(suna8_wram_w) AM_BASE(&suna8_wram) // RAM
AM_RANGE(0xe000, 0xffff) AM_READWRITE(suna8_banked_spriteram_r, suna8_banked_spriteram_w ) // Sprites (Banked)
ADDRESS_MAP_END