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CoCo: fix memory when in ROM mode. This gets cartridged working again. (nw)

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This commit is contained in:
tim lindner 2020-05-17 14:18:07 -07:00
parent e2777bf3f0
commit 25ba39df71
1 changed files with 19 additions and 4 deletions
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23
src/mame/video/gime.cpp
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@ -518,7 +518,7 @@ void gime_device::update_memory(int bank)
{
bank = 7;
offset = 0x1E00;
force_ram = true;
force_ram = (m_gime_registers[0] & 0x08);
enable_mmu = enable_mmu && !(m_gime_registers[0] & 0x08);
}
else
@ -567,10 +567,17 @@ void gime_device::update_memory(int bank)
block = rom_map[m_gime_registers[0] & 3][(block & 0x3F) - 0x3C];
// are we in onboard ROM or cart ROM?
if (BIT(block, 2) && m_cart_rom != nullptr)
if (block > 3)
{
// perform the look up
memory = &m_cart_rom[((block & 3) * 0x2000) % m_cart_size];
if( m_cart_rom)
{
// perform the look up
memory = &m_cart_rom[((block & 3) * 0x2000) % m_cart_size];
}
else
{
memory = 0;
}
}
else
{
@ -589,9 +596,17 @@ void gime_device::update_memory(int bank)
memory += offset;
// set the banks
if( memory )
{
read_bank->set_base(memory);
write_bank->set_base(is_read_only ? m_dummy_bank : memory);
}
else
{
read_bank->set_base(m_dummy_bank);
write_bank->set_base(m_dummy_bank);
}
}