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plottinga: clean up ROM unscrambling function (nw)

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This commit is contained in:
Vas Crabb 2017-01-14 01:01:47 +11:00
parent 88efe59c5e
commit 11b184e01f
1 changed files with 4 additions and 15 deletions
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19
src/mame/drivers/taito_l.cpp
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@ -2532,22 +2532,11 @@ ROM_END
DRIVER_INIT_MEMBER(taitol_1cpu_state, plottinga)
{
u8 tab[256];
u8 *p;
for (unsigned i = 0; i < sizeof(tab); i++)
tab[i] = BITSWAP8(i, 0, 1, 2, 3, 4, 5, 6, 7);
for (int i = 0; i < 256; i++)
{
int v = 0;
for (int j = 0; j < 8; j++)
if (i & (1 << j))
v |= 1 << (7 - j);
tab[i] = v;
}
p = memregion("maincpu")->base();
for (int i = 0; i < 0x10000; i++)
{
*p = tab[*p];
p++;
}
for (unsigned i = 0; i < m_main_prg.length(); i++)
m_main_prg[i] = tab[m_main_prg[i]];
}