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ti99: Take care for cartridge dumps that do not fill the 8K window.

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This commit is contained in:
Michael Zapf 2022-05-06 17:47:41 +02:00
parent 1d4b599118
commit 8ab485a987
1 changed files with 26 additions and 13 deletions
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39
src/devices/bus/ti99/gromport/cartridges.cpp
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@ -102,6 +102,7 @@ ti99_cartridge_device::ti99_cartridge_device(const machine_config &mconfig, cons
void ti99_cartridge_device::prepare_cartridge()
{
int rom1_length = 0;
int rom2_length = 0;
uint8_t* grom_ptr;
@ -139,22 +140,25 @@ void ti99_cartridge_device::prepare_cartridge()
if (m_pcb->m_grom_size > 0x8000) m_pcb->set_grom_pointer(4, subdevice(GROM7_TAG));
}
m_pcb->m_rom_size = loaded_through_softlist() ? get_software_region_length("rom") : m_rpk->get_resource_length("rom_socket");
rom1_length = loaded_through_softlist() ? get_software_region_length("rom") : m_rpk->get_resource_length("rom_socket");
m_pcb->m_bank_mask = 0;
if (m_pcb->m_rom_size > 0)
if (rom1_length > 0)
{
LOGMASKED(LOG_CONFIG, "ROM dump size=0x%04x\n", m_pcb->m_rom_size);
LOGMASKED(LOG_CONFIG, "ROM dump size=0x%04x\n", rom1_length);
// Round up to 8K multiple; dumps may be shorter, but we have
// a cartridge ROM window of 8K
// TODO: Allow for mirroring?
m_pcb->m_rom_size = rom1_length;
if ((rom1_length % 0x2000)!=0)
m_pcb->m_rom_size = (rom1_length + 0x2000) & ~0x1fff;
// Softlist uses only one ROM area, no second socket
if (!loaded_through_softlist())
{
rom2_length = m_rpk->get_resource_length("rom2_socket");
if (rom2_length > 0x2000)
{
LOGMASKED(LOG_WARN, "Can only use 8K for second socket; dump truncated\n");
rom2_length = 0x2000;
}
}
// Using ROM2 socket automatically implies paged12, paged16,
@ -162,24 +166,33 @@ void ti99_cartridge_device::prepare_cartridge()
if (rom2_length > 0)
{
LOGMASKED(LOG_CONFIG, "Second ROM dump size = 0x%04x\n", rom2_length);
if (rom2_length > 0x2000)
{
LOGMASKED(LOG_WARN, "Can only use 8K for second socket; dump truncated\n");
rom2_length = 0x2000;
}
if (m_pcb->m_rom_size > 0x2000)
{
m_pcb->m_rom_size = 0x2000;
LOGMASKED(LOG_WARN, "Can only use 8K for first socket when there is a second one; dump truncated.\n");
LOGMASKED(LOG_WARN, "Can only use 8K for first socket when there is a second socket; dump truncated.\n");
}
m_romspace = std::make_unique<u8[]>(0x4000);
// We assign 16K for both rom1 and rom2, so this is properly
// aligned with the 8K spaces even when the dumps are shorter
m_romspace = make_unique_clear<u8[]>(0x4000);
// Load the contents of the second socket in the upper half
// The contents of the first socket are copied later
rom_ptr = m_rpk->get_contents_of_socket("rom2_socket");
memcpy(m_romspace.get() + 0x2000, rom_ptr, rom2_length);
m_pcb->m_bank_mask = 1;
LOGMASKED(LOG_CONFIG, "ROM bank mask=0x0001 (using rom/rom2)\n");
LOGMASKED(LOG_CONFIG, "ROM bank mask=0x0001 (using ROM1/ROM2)\n");
}
else
{
m_romspace = std::make_unique<u8[]>(m_pcb->m_rom_size);
m_romspace = make_unique_clear<u8[]>(m_pcb->m_rom_size);
// Determine the bank mask for flexible ROM sizes in gromemu
int rsizet = m_pcb->m_rom_size;
@ -197,7 +210,7 @@ void ti99_cartridge_device::prepare_cartridge()
}
rom_ptr = loaded_through_softlist() ? get_software_region("rom") : m_rpk->get_contents_of_socket("rom_socket");
memcpy(m_romspace.get(), rom_ptr, m_pcb->m_rom_size);
memcpy(m_romspace.get(), rom_ptr, rom1_length);
m_pcb->m_rom_ptr = m_romspace.get();
}