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Changed memory width stubs to fill unpopulated regions with the appropriate

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portion of the unmap value.

Changed X2212 device to return unmapped bits for the upper 4 bits.
This commit is contained in:
Aaron Giles 2010-09-21 13:26:27 +00:00
parent 748bbd2b07
commit 9b7a65c490
4 changed files with 13 additions and 9 deletions
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2
src/emu/machine/x2212.c
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@ -215,7 +215,7 @@ WRITE8_MEMBER( x2212_device::write )
READ8_MEMBER( x2212_device::read )
{
return m_addrspace[0]->read_byte(offset) & 0x0f;
return (m_addrspace[0]->read_byte(offset) & 0x0f) | (space.unmap() & 0xf0);
}

16
src/emu/memory.c
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@ -480,6 +480,7 @@ protected:
UINT8 ** m_rambaseptr; // pointer to the bank base
UINT8 m_subunits; // for width stubs, the number of subunits
UINT8 m_subshift[8]; // for width stubs, the shift of each subunit
UINT64 m_invsubmask; // inverted mask of the populated subunits
};
@ -4370,6 +4371,9 @@ void handler_entry::configure_subunits(UINT64 handlermask, int handlerbits)
{
UINT64 unitmask = ((UINT64)1 << handlerbits) - 1;
assert(handlermask != 0);
// set the inverse mask
m_invsubmask = ~handlermask;
// compute the maximum possible subunits
int maxunits = m_datawidth / handlerbits;
@ -4618,7 +4622,7 @@ void handler_entry_read::set_ioport(const input_port_config &ioport)
UINT16 handler_entry_read::read_stub_16_from_8(address_space &space, offs_t offset, UINT16 mask)
{
UINT16 result = 0;
UINT16 result = space.unmap() & m_invsubmask;
for (int index = 0; index < m_subunits; index++)
{
int shift = m_subshift[index];
@ -4637,7 +4641,7 @@ UINT16 handler_entry_read::read_stub_16_from_8(address_space &space, offs_t offs
UINT32 handler_entry_read::read_stub_32_from_8(address_space &space, offs_t offset, UINT32 mask)
{
UINT32 result = 0;
UINT32 result = space.unmap() & m_invsubmask;
for (int index = 0; index < m_subunits; index++)
{
int shift = m_subshift[index];
@ -4656,7 +4660,7 @@ UINT32 handler_entry_read::read_stub_32_from_8(address_space &space, offs_t offs
UINT64 handler_entry_read::read_stub_64_from_8(address_space &space, offs_t offset, UINT64 mask)
{
UINT64 result = 0;
UINT64 result = space.unmap() & m_invsubmask;
for (int index = 0; index < m_subunits; index++)
{
int shift = m_subshift[index];
@ -4675,7 +4679,7 @@ UINT64 handler_entry_read::read_stub_64_from_8(address_space &space, offs_t offs
UINT32 handler_entry_read::read_stub_32_from_16(address_space &space, offs_t offset, UINT32 mask)
{
UINT32 result = 0;
UINT32 result = space.unmap() & m_invsubmask;
for (int index = 0; index < m_subunits; index++)
{
int shift = m_subshift[index];
@ -4694,7 +4698,7 @@ UINT32 handler_entry_read::read_stub_32_from_16(address_space &space, offs_t off
UINT64 handler_entry_read::read_stub_64_from_16(address_space &space, offs_t offset, UINT64 mask)
{
UINT64 result = 0;
UINT64 result = space.unmap() & m_invsubmask;
for (int index = 0; index < m_subunits; index++)
{
int shift = m_subshift[index];
@ -4713,7 +4717,7 @@ UINT64 handler_entry_read::read_stub_64_from_16(address_space &space, offs_t off
UINT64 handler_entry_read::read_stub_64_from_32(address_space &space, offs_t offset, UINT64 mask)
{
UINT64 result = 0;
UINT64 result = space.unmap() & m_invsubmask;
for (int index = 0; index < m_subunits; index++)
{
int shift = m_subshift[index];

2
src/mame/drivers/ccastles.c
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@ -313,7 +313,7 @@ static WRITE8_HANDLER( nvram_store_w )
static READ8_HANDLER( nvram_r )
{
ccastles_state *state = space->machine->driver_data<ccastles_state>();
return state->nvram_4b->read(*space, offset) | (state->nvram_4a->read(*space, offset) << 4);
return (state->nvram_4b->read(*space, offset) & 0x0f) | (state->nvram_4a->read(*space, offset) << 4);
}

2
src/mame/drivers/firefox.c
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@ -357,7 +357,7 @@ static WRITE8_HANDLER( nvram_w )
static READ8_HANDLER( nvram_r )
{
return (nvram_1c->read(*space, offset) << 4) | nvram_1d->read(*space, offset);
return (nvram_1c->read(*space, offset) << 4) | (nvram_1d->read(*space, offset) & 0x0f);
}
static WRITE8_HANDLER( novram_recall_w )