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(MESS) ti99: Safety check for special cartridges (nw)

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This commit is contained in:
Michael Zapf 2013-08-02 13:51:26 +00:00
parent e533ab056f
commit bed1ffdf73
1 changed files with 26 additions and 1 deletions
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27
src/mess/machine/ti99/gromport.c
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@ -1522,7 +1522,10 @@ READ8Z_MEMBER(ti99_minimem_cartridge::readz)
{
if ((offset & 0x1000)==0x0000)
{
*value = m_rom_ptr[offset & 0x0fff];
if (m_rom_ptr!=NULL) // Super-Minimem seems to have no ROM
{
*value = m_rom_ptr[offset & 0x0fff];
}
}
else
{
@ -1861,6 +1864,9 @@ void ti99_pagedcru_cartridge::cruwrite(offs_t offset, UINT8 data)
rxbv555 (repeating reset on Master Title Screen)
superxb (lockup, fix: add RAM at 7c00)
Super-MiniMemory is also included here. We assume a RAM area at addresses
7000-7fff for this cartridge.
******************************************************************************/
READ8Z_MEMBER(ti99_gromemu_cartridge::readz)
@ -1869,6 +1875,16 @@ READ8Z_MEMBER(ti99_gromemu_cartridge::readz)
gromemureadz(space, offset, value, mem_mask);
else
{
if (m_ram_ptr != NULL)
{
// Variant of the cartridge which emulates MiniMemory. We don't introduce
// another type for this single cartridge.
if ((offset & 0x1fff)==0x1000) {
*value = m_ram_ptr[offset & 0x0fff];
return;
}
}
if (m_rom_ptr == NULL) return;
if (m_rom_page==0)
{
@ -1888,6 +1904,15 @@ WRITE8_MEMBER(ti99_gromemu_cartridge::write)
gromemuwrite(space, offset, data, mem_mask);
else {
if (m_ram_ptr != NULL)
{
// Lines for Super-Minimem; see above
if ((offset & 0x1fff)==0x1000) {
m_ram_ptr[offset & 0x0fff] = data;
}
return; // no paging
}
m_rom_page = (offset >> 1) & 1;
}
}