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gime: Fix ROM mapping again; initialize one more variable

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This commit is contained in:
AJR 2021-03-15 12:14:16 -04:00
parent e21ba3aa22
commit 91fc42789c
1 changed files with 7 additions and 17 deletions
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24
src/mame/video/gime.cpp
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@ -301,6 +301,8 @@ void gime_device::device_reset(void)
m_displayed_rgb = false;
m_ff22_value = 0;
update_memory();
reset_timer();
}
@ -552,27 +554,15 @@ void gime_device::update_memory(int bank)
if (((block & 0x3F) >= 0x3C) && !(m_sam_state & SAM_STATE_TY) && !force_ram)
{
// we're in ROM
static const uint8_t rom_map[4][4] =
{
{ 0, 1, 4, 5 },
{ 0, 1, 4, 5 },
{ 0, 1, 2, 3 },
{ 6, 7, 4, 5 }
};
// Pin ROM page to MMU slot
block = (block & 0xfc) | (bank & 0x03);
// look up the block in the ROM map
block = rom_map[m_gime_registers[0] & 3][(block & 0x3F) - 0x3C];
const uint8_t rom_mode = m_gime_registers[0] & 3;
// are we in onboard ROM or cart ROM?
if (block > 3)
if (rom_mode == 3 || (rom_mode < 2 && (block & 0x3F) >= 0x3E))
{
if (m_cart_rom)
{
// perform the look up
memory = &m_cart_rom[((block & 3) * 0x2000) % m_cart_size];
// perform the look up (ROM page is pinned to MMU slot)
memory = &m_cart_rom[(((bank & 3) ^ 2) * 0x2000) % m_cart_size];
}
else
{
@ -581,7 +571,7 @@ void gime_device::update_memory(int bank)
}
else
{
memory = &m_rom[(block & 3) * 0x2000];
memory = &m_rom[(bank & 3) * 0x2000];
}
is_read_only = true;
}